Chemical: New Applications
https://www.maplesoft.com/applications/category.aspx?cid=191
en-us2020 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemSat, 08 Aug 2020 20:58:15 GMTSat, 08 Aug 2020 20:58:15 GMTNew applications in the Chemical categoryhttps://www.maplesoft.com/images/Application_center_hp.jpgChemical: New Applications
https://www.maplesoft.com/applications/category.aspx?cid=191
Vapor-Liquid Equilibrium of Benzene and Toluene
https://www.maplesoft.com/applications/view.aspx?SID=154649&ref=Feed
This application calculate the vapor-liquid equilibrium of a benzene-toluene mixture. Specifically, the application calculates the:
<UL>
<LI>temperature, given the composition of the liquid phase and pressure
<LI>dew point and composition of the liquid phase given composition of the vapor phase and pressure
</UL>
The application employs the empirical Antoine equation to calculate the vapor pressures of benzene and toluene. The parameters are sourced from the NIST Chemistry Webbook.
<BR><BR>
The techniques used here can be applied to many other mixtures - you just need to find the right data for the Antoine equation.<img src="https://www.maplesoft.com/view.aspx?si=154649/thumb.png" alt="Vapor-Liquid Equilibrium of Benzene and Toluene" style="max-width: 25%;" align="left"/>This application calculate the vapor-liquid equilibrium of a benzene-toluene mixture. Specifically, the application calculates the:
<UL>
<LI>temperature, given the composition of the liquid phase and pressure
<LI>dew point and composition of the liquid phase given composition of the vapor phase and pressure
</UL>
The application employs the empirical Antoine equation to calculate the vapor pressures of benzene and toluene. The parameters are sourced from the NIST Chemistry Webbook.
<BR><BR>
The techniques used here can be applied to many other mixtures - you just need to find the right data for the Antoine equation.https://www.maplesoft.com/applications/view.aspx?SID=154649&ref=FeedTue, 30 Jun 2020 04:00:00 ZSamir KhanSamir KhanHeat Transfer Coefficient and Critical Heat Flux for Nucleate Pool Boiling
https://www.maplesoft.com/applications/view.aspx?SID=154650&ref=Feed
This application computes the:
<UL><LI>heat transfer coefficient for nucleate pool boiling using the correlation published by Foster and Zuber (1955)
<LI>and actual and critical heat fluxes.
</UL>
If the actual heat flux is greater than the critical heat flux, a vapor film separates the liquid from rewetting the surface of the container. This decreases the efficiency of heat transfer.<img src="https://www.maplesoft.com/view.aspx?si=154650/thumb.png" alt="Heat Transfer Coefficient and Critical Heat Flux for Nucleate Pool Boiling" style="max-width: 25%;" align="left"/>This application computes the:
<UL><LI>heat transfer coefficient for nucleate pool boiling using the correlation published by Foster and Zuber (1955)
<LI>and actual and critical heat fluxes.
</UL>
If the actual heat flux is greater than the critical heat flux, a vapor film separates the liquid from rewetting the surface of the container. This decreases the efficiency of heat transfer.https://www.maplesoft.com/applications/view.aspx?SID=154650&ref=FeedTue, 30 Jun 2020 04:00:00 ZSamir KhanSamir KhanPressure Drop of Gas and Liquid Flowing in a Pipe
https://www.maplesoft.com/applications/view.aspx?SID=154636&ref=Feed
This application calculates the two-phase pressure gradient for gas and liquid flowing in a pipe. The Lockhart-Martinelli separated flow approach is used.<img src="https://www.maplesoft.com/view.aspx?si=154636/pipe.png" alt="Pressure Drop of Gas and Liquid Flowing in a Pipe" style="max-width: 25%;" align="left"/>This application calculates the two-phase pressure gradient for gas and liquid flowing in a pipe. The Lockhart-Martinelli separated flow approach is used.https://www.maplesoft.com/applications/view.aspx?SID=154636&ref=FeedMon, 20 Apr 2020 04:00:00 ZSamir KhanSamir KhanCatalytic Cracking of Ethane
https://www.maplesoft.com/applications/view.aspx?SID=154399&ref=Feed
Ethylene and hydrogen are generated by a steam cracker using ethane as a feedstock.
<BR><BR>
<CENTER>
C<SUB>2</SUB>H<SUB>6</SUB> (g) ⇌ C<SUB>2</SUB>H<SUB>4</SUB> (g) + H<SUB>2</SUB> (g)
</CENTER>
<BR>
The feed is 4 mol of H<SUB>2</SUB>O to 1 mol of ethane, with the cracker operating at 1.01 bar and 1000 K. The products contain CH<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>2</SUB>, CO<SUB>2</SUB>, CO, O<SUB>2</SUB>, H<SUB>2</SUB>, H<SUB>2</SUB>O, and C<SUB>2</SUB>H<SUB>6</SUB>.<BR><BR>
This application calculates the composition of the reaction products by
<UL>
<LI>calculating the Gibbs Energy of Formation of the individual species in the products, employing data from the ThermophysicalData:-Chemicals package
<LI>constructing a function that describes Gibbs Energy of the products as a function of product composition
<LI>and minimizing the Gibbs Energy of the products, subject to constraints on the carbon and hydrogen in the system (this employs the Optimization package)
</UL><img src="https://www.maplesoft.com/view.aspx?si=154399/image.png" alt="Catalytic Cracking of Ethane" style="max-width: 25%;" align="left"/>Ethylene and hydrogen are generated by a steam cracker using ethane as a feedstock.
<BR><BR>
<CENTER>
C<SUB>2</SUB>H<SUB>6</SUB> (g) ⇌ C<SUB>2</SUB>H<SUB>4</SUB> (g) + H<SUB>2</SUB> (g)
</CENTER>
<BR>
The feed is 4 mol of H<SUB>2</SUB>O to 1 mol of ethane, with the cracker operating at 1.01 bar and 1000 K. The products contain CH<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>2</SUB>, CO<SUB>2</SUB>, CO, O<SUB>2</SUB>, H<SUB>2</SUB>, H<SUB>2</SUB>O, and C<SUB>2</SUB>H<SUB>6</SUB>.<BR><BR>
This application calculates the composition of the reaction products by
<UL>
<LI>calculating the Gibbs Energy of Formation of the individual species in the products, employing data from the ThermophysicalData:-Chemicals package
<LI>constructing a function that describes Gibbs Energy of the products as a function of product composition
<LI>and minimizing the Gibbs Energy of the products, subject to constraints on the carbon and hydrogen in the system (this employs the Optimization package)
</UL>https://www.maplesoft.com/applications/view.aspx?SID=154399&ref=FeedFri, 09 Mar 2018 05:00:00 ZSamir KhanSamir KhanConcentration of NOx in Clean Air
https://www.maplesoft.com/applications/view.aspx?SID=154402&ref=Feed
The chemical species NO and NO<SUB>2</SUB> are collectively known as NOx. This application will predict the equilibrium concentration of NOx in clean, unpolluted air at 1 atm pressure and 298 K. This establishes a background concentration of NOx; pollution from vehicle emissions and other sources will increase this level.
<BR><BR>
Air is assumed to be 21% O<SUB>2</SUB> and 79% N<SUB>2</SUB> by mole, some of which reacts into NO and NO<SUB>2</SUB>; no other species are considered.
<BR><BR>
Balancing the moles of O<SUB>2</SUB>, N<SUB>2</SUB>, NO and NO<SUB>2</SUB> gives this equation
<BR>
<BR>
<CENTER>
0.21 O<SUB>2</SUB> + 0.79 N<SUB>2</SUB> = n1 O<SUB>2</SUB> + n2 N<SUB>2</SUB> + n3 NO + n4 NO<SUB>2</SUB>
</CENTER>
<BR>
where n1, n2, n3 and n4 are the number of moles of O<SUB>2</SUB>, N<SUB>2</SUB>, NO and NO<SUB>2</SUB>.
<BR><BR>
First, the we will develop a function that describes the total Gibbs Free Energy of the system as a function of the moles of the individual species. Then, we will minimize the Gibbs Free Energy to find the equilibrium composition
<BR><BR>
This will give the values of n1, n2, n3 and n4. The number of moles of NOx in the system is then simply n3 + n4.
<BR><BR>
This application uses the empirical correlations in the ThermophysicalData:-Chemicals package to calculate values of enthalpy and entropy.<img src="https://www.maplesoft.com/applications/images/app_image_blank_lg.jpg" alt="Concentration of NOx in Clean Air" style="max-width: 25%;" align="left"/>The chemical species NO and NO<SUB>2</SUB> are collectively known as NOx. This application will predict the equilibrium concentration of NOx in clean, unpolluted air at 1 atm pressure and 298 K. This establishes a background concentration of NOx; pollution from vehicle emissions and other sources will increase this level.
<BR><BR>
Air is assumed to be 21% O<SUB>2</SUB> and 79% N<SUB>2</SUB> by mole, some of which reacts into NO and NO<SUB>2</SUB>; no other species are considered.
<BR><BR>
Balancing the moles of O<SUB>2</SUB>, N<SUB>2</SUB>, NO and NO<SUB>2</SUB> gives this equation
<BR>
<BR>
<CENTER>
0.21 O<SUB>2</SUB> + 0.79 N<SUB>2</SUB> = n1 O<SUB>2</SUB> + n2 N<SUB>2</SUB> + n3 NO + n4 NO<SUB>2</SUB>
</CENTER>
<BR>
where n1, n2, n3 and n4 are the number of moles of O<SUB>2</SUB>, N<SUB>2</SUB>, NO and NO<SUB>2</SUB>.
<BR><BR>
First, the we will develop a function that describes the total Gibbs Free Energy of the system as a function of the moles of the individual species. Then, we will minimize the Gibbs Free Energy to find the equilibrium composition
<BR><BR>
This will give the values of n1, n2, n3 and n4. The number of moles of NOx in the system is then simply n3 + n4.
<BR><BR>
This application uses the empirical correlations in the ThermophysicalData:-Chemicals package to calculate values of enthalpy and entropy.https://www.maplesoft.com/applications/view.aspx?SID=154402&ref=FeedFri, 09 Mar 2018 05:00:00 ZSamir KhanSamir KhanTernary Plot of the Break Energy of PS/PBMA/PVDF Polymer Blends
https://www.maplesoft.com/applications/view.aspx?SID=154418&ref=Feed
Employing the Interpolation package, this application generates a smoothly shaded ternary plot of the energy at break of polystyrene, polyethyl methacrylate and polyvinylidene fluoride blends.
<BR><BR>
Experimental data is taken from "Application of Statistical Mixture Models for Ternary Polymer Blends", Nascimento, I. et al, J. Braz. Chem. Soc., Vol. 8, No. 6, 587-595, 1997<img src="https://www.maplesoft.com/view.aspx?si=154418/Untitled.png" alt="Ternary Plot of the Break Energy of PS/PBMA/PVDF Polymer Blends" style="max-width: 25%;" align="left"/>Employing the Interpolation package, this application generates a smoothly shaded ternary plot of the energy at break of polystyrene, polyethyl methacrylate and polyvinylidene fluoride blends.
<BR><BR>
Experimental data is taken from "Application of Statistical Mixture Models for Ternary Polymer Blends", Nascimento, I. et al, J. Braz. Chem. Soc., Vol. 8, No. 6, 587-595, 1997https://www.maplesoft.com/applications/view.aspx?SID=154418&ref=FeedFri, 09 Mar 2018 05:00:00 ZSamir KhanSamir KhanEquilibrium Concentration of the Catalytic Reforming of Methane with Steam
https://www.maplesoft.com/applications/view.aspx?SID=154400&ref=Feed
This application calculates the equilibrium concentration of the products when methane is reformed with steam at 1000 K and 1.01 bar.
<BR><BR>
Methane reacts with water to generate carbon dioxide and hydrogen.<BR>
<CENTER>
CH<SUB>4</SUB> + 2 H<SUB>2</SUB>O → CO<SUB>2</SUB> + 4 H<SUB>2</SUB>
</CENTER>
<BR>
In parallel, the water-gas shift reaction generates carbon monoxide from carbon dioxide and hydrogen.
<BR>
<CENTER>
CO<SUB>2</SUB> + H<SUB>2</SUB> → CO + H<SUB>2</SUB>O
</CENTER>
<BR>
This application
<UL>
<LI>calculates the Gibbs free energy of formation of the individual species in the products
<LI>constructs a function that gives the total Gibbs free energy of the products, as a function of the number of moles of each species
<LI>and minimizes the total Gibbs free energy
</UL>
This application employs thermodynamic data from the ThermosphysicalData:-Chemicals package
</UL><img src="https://www.maplesoft.com/applications/images/app_image_blank_lg.jpg" alt="Equilibrium Concentration of the Catalytic Reforming of Methane with Steam" style="max-width: 25%;" align="left"/>This application calculates the equilibrium concentration of the products when methane is reformed with steam at 1000 K and 1.01 bar.
<BR><BR>
Methane reacts with water to generate carbon dioxide and hydrogen.<BR>
<CENTER>
CH<SUB>4</SUB> + 2 H<SUB>2</SUB>O → CO<SUB>2</SUB> + 4 H<SUB>2</SUB>
</CENTER>
<BR>
In parallel, the water-gas shift reaction generates carbon monoxide from carbon dioxide and hydrogen.
<BR>
<CENTER>
CO<SUB>2</SUB> + H<SUB>2</SUB> → CO + H<SUB>2</SUB>O
</CENTER>
<BR>
This application
<UL>
<LI>calculates the Gibbs free energy of formation of the individual species in the products
<LI>constructs a function that gives the total Gibbs free energy of the products, as a function of the number of moles of each species
<LI>and minimizes the total Gibbs free energy
</UL>
This application employs thermodynamic data from the ThermosphysicalData:-Chemicals package
</UL>https://www.maplesoft.com/applications/view.aspx?SID=154400&ref=FeedFri, 09 Mar 2018 05:00:00 ZSamir KhanSamir KhanColor of Gold-Silver-Copper Alloys
https://www.maplesoft.com/applications/view.aspx?SID=154253&ref=Feed
This application plots the colors of gold-silver-copper alloys on a ternary diagram.
<BR><BR>
A spreadsheet (attached to this workbook) contains experimental CIE xyY colorspace coordinates of gold-silver-copper alloys under a C illuminant with a 2° observer (Roberts & Clark, 1979). The color data is translated into the CIE Lab colorspace and plotted on a ternary diagram.
<BR><BR>
A ternary diagram is a non-standard Maple plot, but can be constructed using Maple's programmatic visualization tools.<img src="https://www.maplesoft.com/view.aspx?si=154253/screengrab.png" alt="Color of Gold-Silver-Copper Alloys" style="max-width: 25%;" align="left"/>This application plots the colors of gold-silver-copper alloys on a ternary diagram.
<BR><BR>
A spreadsheet (attached to this workbook) contains experimental CIE xyY colorspace coordinates of gold-silver-copper alloys under a C illuminant with a 2° observer (Roberts & Clark, 1979). The color data is translated into the CIE Lab colorspace and plotted on a ternary diagram.
<BR><BR>
A ternary diagram is a non-standard Maple plot, but can be constructed using Maple's programmatic visualization tools.https://www.maplesoft.com/applications/view.aspx?SID=154253&ref=FeedMon, 29 May 2017 04:00:00 ZSamir KhanSamir KhanInteracting Tank Resevoirs
https://www.maplesoft.com/applications/view.aspx?SID=153986&ref=Feed
This worksheet models liquid flow between three tanks connected by two pipes (the first pipe connecting Tank 1 and 2, and the second pipe connecting Tank 2 and 3).
<BR><BR>
The flow is opposed by pipe friction, and the level of liquid in each tank oscillates to equilibrium. Differential equations that describe the dynamic change in liquid height in each tank and a momentum balance are solved numerically.<img src="https://www.maplesoft.com/view.aspx?si=153986/itr.png" alt="Interacting Tank Resevoirs" style="max-width: 25%;" align="left"/>This worksheet models liquid flow between three tanks connected by two pipes (the first pipe connecting Tank 1 and 2, and the second pipe connecting Tank 2 and 3).
<BR><BR>
The flow is opposed by pipe friction, and the level of liquid in each tank oscillates to equilibrium. Differential equations that describe the dynamic change in liquid height in each tank and a momentum balance are solved numerically.https://www.maplesoft.com/applications/view.aspx?SID=153986&ref=FeedWed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanAnalysis of a Vapor Compression Refrigeration Cycle
https://www.maplesoft.com/applications/view.aspx?SID=153982&ref=Feed
This application analyzes the heat flows across a vapor compression refrigeration cycle, and calculates its coefficient of performance.
<BR><BR>
Additionally, the thermodynamic cycle will be plotted on a pressure-enthalpy-temperature chart.
<BR><BR>
The compressor, condenser, throttle and evaporator are analyzed in sequence with this equation, a statement of the conservation of energy,
<BR><BR>
q - w= Δh + ΔKE + ΔPE
<BR><BR>
where
<UL>
<LI>w is the work done by the component
<LI>ΔKE and ΔPE are the changes in kinetic and potential energy
<LI>Δh is the change in specific enthalpy
<LI>q is the heat transferred to the system
</UL><img src="https://www.maplesoft.com/view.aspx?si=153982/Analysis_VCRC.png" alt="Analysis of a Vapor Compression Refrigeration Cycle" style="max-width: 25%;" align="left"/>This application analyzes the heat flows across a vapor compression refrigeration cycle, and calculates its coefficient of performance.
<BR><BR>
Additionally, the thermodynamic cycle will be plotted on a pressure-enthalpy-temperature chart.
<BR><BR>
The compressor, condenser, throttle and evaporator are analyzed in sequence with this equation, a statement of the conservation of energy,
<BR><BR>
q - w= Δh + ΔKE + ΔPE
<BR><BR>
where
<UL>
<LI>w is the work done by the component
<LI>ΔKE and ΔPE are the changes in kinetic and potential energy
<LI>Δh is the change in specific enthalpy
<LI>q is the heat transferred to the system
</UL>https://www.maplesoft.com/applications/view.aspx?SID=153982&ref=FeedWed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanDouble Pipe Heat Exchanger
https://www.maplesoft.com/applications/view.aspx?SID=153984&ref=Feed
This application models the temperature dynamics of a countercurrent double pipe heat exchanger. Three partial differential equations describe
<UL>
<LI>heat balances across the tube- and shell-side liquids,
<LI>and a heat balance across the tube-wall (taking into account the heat flow from the shell- and tube-side liquids, and conduction along the length of the tube)
</UL>
The equations are solved numerically, and the temperature profiles are plotted. The heat exchanger is assumed to be perfectly insulated. Densities, specific heat capacities, heat transfer coefficients, and thermal conductivities are assumed to be constant.<img src="https://www.maplesoft.com/view.aspx?si=153984/Double_Pipe.png" alt="Double Pipe Heat Exchanger" style="max-width: 25%;" align="left"/>This application models the temperature dynamics of a countercurrent double pipe heat exchanger. Three partial differential equations describe
<UL>
<LI>heat balances across the tube- and shell-side liquids,
<LI>and a heat balance across the tube-wall (taking into account the heat flow from the shell- and tube-side liquids, and conduction along the length of the tube)
</UL>
The equations are solved numerically, and the temperature profiles are plotted. The heat exchanger is assumed to be perfectly insulated. Densities, specific heat capacities, heat transfer coefficients, and thermal conductivities are assumed to be constant.https://www.maplesoft.com/applications/view.aspx?SID=153984&ref=FeedWed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanEconomic Pipe Sizer
https://www.maplesoft.com/applications/view.aspx?SID=153985&ref=Feed
Pipework is a large part of the cost of a process plant. Plant designers need to minimize the total cost of this pipework across the lifetime of the plant. The total overall cost is a combination of individual costs relating to the
<UL>
<LI>pipe material,
<LI>installation,
<LI>maintenance,
<LI>depreciation,
<LI>energy costs for pumping,
<LI>liquid parameters,
<LI>required flowrate,
<LI>pumping efficiencies,
<LI>taxes,
<LI>and more.
</UL>
This application uses the approach described in the reference to find the pipe diameter that minimizes the total overall cost. The method involves the iterative solution of an empirical equation using Maple’s fsolve() function (the code is in the Startup code region)
<BR><BR>
Bear in mind that the empirical parameters vary as economic conditions change. Those used in this application are correct for 1998 and 2008 (as given in the reference)
<BR><BR>
Reference: "Updating the Rules for Pipe Sizing", Durand et al., Chemical Engineering, January 2010<img src="https://www.maplesoft.com/view.aspx?si=153985/EPS.png" alt="Economic Pipe Sizer" style="max-width: 25%;" align="left"/>Pipework is a large part of the cost of a process plant. Plant designers need to minimize the total cost of this pipework across the lifetime of the plant. The total overall cost is a combination of individual costs relating to the
<UL>
<LI>pipe material,
<LI>installation,
<LI>maintenance,
<LI>depreciation,
<LI>energy costs for pumping,
<LI>liquid parameters,
<LI>required flowrate,
<LI>pumping efficiencies,
<LI>taxes,
<LI>and more.
</UL>
This application uses the approach described in the reference to find the pipe diameter that minimizes the total overall cost. The method involves the iterative solution of an empirical equation using Maple’s fsolve() function (the code is in the Startup code region)
<BR><BR>
Bear in mind that the empirical parameters vary as economic conditions change. Those used in this application are correct for 1998 and 2008 (as given in the reference)
<BR><BR>
Reference: "Updating the Rules for Pipe Sizing", Durand et al., Chemical Engineering, January 2010https://www.maplesoft.com/applications/view.aspx?SID=153985&ref=FeedWed, 02 Mar 2016 05:00:00 ZSamir KhanSamir KhanAnalysis of a Refrigeration Cycle with CoolProp
https://www.maplesoft.com/applications/view.aspx?SID=153490&ref=Feed
<p>This application analyzes a vapor compression refrigeration cycle for the refrigerant R134a. The application calculates heat changes over the compressor, condenser, throttle and evaporator, together with the coefficient of performance. Additionally, a P-h-T chart illustrating the refrigeration cycle is plotted.</p>
<p>Thermophysical properties are provided by the open source C++ CoolProp library (<a href="http://coolprop.org/">http://coolprop.org</a>). Once compiled and linked to Maple, CoolProp lets you access the properties of pure fluids, pseudo-pure fluids, and humid air with a function call. This application comes with a CoolProp DLL for 64-bit Windows. You may need to compile CoolProp for your own environment for a compatible library. </p><img src="https://www.maplesoft.com/view.aspx?si=153490/PT_Chart.png" alt="Analysis of a Refrigeration Cycle with CoolProp" style="max-width: 25%;" align="left"/><p>This application analyzes a vapor compression refrigeration cycle for the refrigerant R134a. The application calculates heat changes over the compressor, condenser, throttle and evaporator, together with the coefficient of performance. Additionally, a P-h-T chart illustrating the refrigeration cycle is plotted.</p>
<p>Thermophysical properties are provided by the open source C++ CoolProp library (<a href="http://coolprop.org/">http://coolprop.org</a>). Once compiled and linked to Maple, CoolProp lets you access the properties of pure fluids, pseudo-pure fluids, and humid air with a function call. This application comes with a CoolProp DLL for 64-bit Windows. You may need to compile CoolProp for your own environment for a compatible library. </p>https://www.maplesoft.com/applications/view.aspx?SID=153490&ref=FeedFri, 17 Jan 2014 05:00:00 ZSamir KhanSamir KhanAnalysis of basic equations of state (II)
https://www.maplesoft.com/applications/view.aspx?SID=134136&ref=Feed
<p>This is the second of a series of Maple worksheets developed for teaching chemical thermodynamics.</p>
<p>Given a two-constant equation of state (the worksheet includes the most common), this worksheet calculates its critical point, reduced form, volumetric coefficients, Boyle's temperature, virial expansion and internal pressure.</p><img src="https://www.maplesoft.com/view.aspx?si=134136/436839\ae00ea34ed62fd64822a9ee2652b3c1c.gif" alt="Analysis of basic equations of state (II)" style="max-width: 25%;" align="left"/><p>This is the second of a series of Maple worksheets developed for teaching chemical thermodynamics.</p>
<p>Given a two-constant equation of state (the worksheet includes the most common), this worksheet calculates its critical point, reduced form, volumetric coefficients, Boyle's temperature, virial expansion and internal pressure.</p>https://www.maplesoft.com/applications/view.aspx?SID=134136&ref=FeedSat, 12 May 2012 04:00:00 ZChristian Viales MonteroChristian Viales MonteroVan der Waals equation of state (I)
https://www.maplesoft.com/applications/view.aspx?SID=134131&ref=Feed
<p>This is the first of a series of Maple worksheets developed for teaching chemical thermodynamics.</p>
<p>Given the van der Waals' constants, this worksheet plots: a) the PV van der Waals' isotherms as-given by the equation, b) the PV isotherms based on Maxwell's construction, c) the compressibility factor isotherms based on the low pressure series expansion, and d) the compressibility factor isotherms based on Maxwell's construction. All procedures are independent and were developed to work with the classic interface.</p><img src="https://www.maplesoft.com/view.aspx?si=134131/436827\41b8ef0a763a603085145e0cf8cd9b47.gif" alt="Van der Waals equation of state (I)" style="max-width: 25%;" align="left"/><p>This is the first of a series of Maple worksheets developed for teaching chemical thermodynamics.</p>
<p>Given the van der Waals' constants, this worksheet plots: a) the PV van der Waals' isotherms as-given by the equation, b) the PV isotherms based on Maxwell's construction, c) the compressibility factor isotherms based on the low pressure series expansion, and d) the compressibility factor isotherms based on Maxwell's construction. All procedures are independent and were developed to work with the classic interface.</p>https://www.maplesoft.com/applications/view.aspx?SID=134131&ref=FeedSat, 12 May 2012 04:00:00 ZChristian Viales MonteroChristian Viales MonteroWater Hammer
https://www.maplesoft.com/applications/view.aspx?SID=129503&ref=Feed
<p>When a valve at the end of a pipeline suddenly closes, a pressure surge hits the valve and travels along the pipeline. This process is modeled by two PDEs. The PDEs can be discretized along the spatial dimension to give a set of ODEs. This application, for a given set of parameters, solves the resulting ODEs numerically and plots the pressure dynamics at the valve.</p><img src="https://www.maplesoft.com/view.aspx?si=129503/waterhammer_sm.jpg" alt="Water Hammer" style="max-width: 25%;" align="left"/><p>When a valve at the end of a pipeline suddenly closes, a pressure surge hits the valve and travels along the pipeline. This process is modeled by two PDEs. The PDEs can be discretized along the spatial dimension to give a set of ODEs. This application, for a given set of parameters, solves the resulting ODEs numerically and plots the pressure dynamics at the valve.</p>https://www.maplesoft.com/applications/view.aspx?SID=129503&ref=FeedMon, 09 Jan 2012 05:00:00 ZMaplesoftMaplesoftThe Three Reservoir Problem
https://www.maplesoft.com/applications/view.aspx?SID=119851&ref=Feed
Three reservoirs at different elevations are connected through a piping network at a single point, with an outflow from the common junction. This application will calculate the flowrates, flow directions and head at the common junction. This is a classic problem in hydraulic engineering. Through an understanding of the concepts associated therein, many hydraulic challenges can be solved.<img src="https://www.maplesoft.com/view.aspx?si=119851/ScreenShot001.jpg" alt="The Three Reservoir Problem" style="max-width: 25%;" align="left"/>Three reservoirs at different elevations are connected through a piping network at a single point, with an outflow from the common junction. This application will calculate the flowrates, flow directions and head at the common junction. This is a classic problem in hydraulic engineering. Through an understanding of the concepts associated therein, many hydraulic challenges can be solved.https://www.maplesoft.com/applications/view.aspx?SID=119851&ref=FeedThu, 12 May 2011 04:00:00 ZMaplesoftMaplesoftCountercurrent Double Pipe Heat Exchanger
https://www.maplesoft.com/applications/view.aspx?SID=119402&ref=Feed
This application models the temperature dynamics of a countercurrent double pipe heat exchanger. Three partial differential equations are derived from heat balances across the tube- and shell-side liquids, and the tube wall (accounting for heat flow from the shell- and tube-side liquids, and conduction along the length of the tube).
The equations are solved numerically, and the temperature profiles are plotted. The heat exchanger is assumed to be perfectly insulated. Densities, specific heat capacities, heat transfer coefficients, and thermal conductivities are assumed to be constant.<img src="https://www.maplesoft.com/view.aspx?si=119402/381585\tube.png" alt="Countercurrent Double Pipe Heat Exchanger" style="max-width: 25%;" align="left"/>This application models the temperature dynamics of a countercurrent double pipe heat exchanger. Three partial differential equations are derived from heat balances across the tube- and shell-side liquids, and the tube wall (accounting for heat flow from the shell- and tube-side liquids, and conduction along the length of the tube).
The equations are solved numerically, and the temperature profiles are plotted. The heat exchanger is assumed to be perfectly insulated. Densities, specific heat capacities, heat transfer coefficients, and thermal conductivities are assumed to be constant.https://www.maplesoft.com/applications/view.aspx?SID=119402&ref=FeedThu, 28 Apr 2011 04:00:00 ZMaplesoftMaplesoftDouble Pipe Countercurrent Heat Exchanger
https://www.maplesoft.com/applications/view.aspx?SID=100377&ref=Feed
In this model, water on the shell-side heats milk on the tube-side in a countercurrent double-pipe heat exchanger. The heat exchanger is modeled via a heat balance on a discretized control volume, with the system equations implemented in a custom component. A full derivation of the system equations is given in an attached document (look under Project>Attachments>Documents). Heat transfer coefficients are given by the Dittus-Boelter correlation, and the temperature variation of the milk viscosity is accounted for.<img src="https://www.maplesoft.com/view.aspx?si=100377/sim_icon.jpg" alt="Double Pipe Countercurrent Heat Exchanger" style="max-width: 25%;" align="left"/>In this model, water on the shell-side heats milk on the tube-side in a countercurrent double-pipe heat exchanger. The heat exchanger is modeled via a heat balance on a discretized control volume, with the system equations implemented in a custom component. A full derivation of the system equations is given in an attached document (look under Project>Attachments>Documents). Heat transfer coefficients are given by the Dittus-Boelter correlation, and the temperature variation of the milk viscosity is accounted for.https://www.maplesoft.com/applications/view.aspx?SID=100377&ref=FeedWed, 22 Dec 2010 05:00:00 ZMaplesoftMaplesoftPlotting Capabilities for Engineers
https://www.maplesoft.com/applications/view.aspx?SID=6979&ref=Feed
Maple contains an extensive set of visualization tools and options, including many plots and options commonly used by engineers. This Tips & Techniques document demonstrates how to create and customize your plots using interactive techniques and command options, with emphasis on options used in engineering contexts.<img src="https://www.maplesoft.com/view.aspx?si=6979/thumb.gif" alt="Plotting Capabilities for Engineers" style="max-width: 25%;" align="left"/>Maple contains an extensive set of visualization tools and options, including many plots and options commonly used by engineers. This Tips & Techniques document demonstrates how to create and customize your plots using interactive techniques and command options, with emphasis on options used in engineering contexts.https://www.maplesoft.com/applications/view.aspx?SID=6979&ref=FeedWed, 03 Dec 2008 05:00:00 ZMaplesoftMaplesoft