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Workshop 6.1 Steady State Thermal Analysis

Workshop 6.1 Steady State Thermal Analysis. Workshop 6.1 - Goals. In this workshop we will analyze the pump housing shown below for its heat transfer characteristics. Specifically a plastic and an aluminum version of the housing will be analyzed using the same boundary conditions.

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Workshop 6.1 Steady State Thermal Analysis

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  1. Workshop 6.1Steady State Thermal Analysis

  2. Workshop 6.1 - Goals In this workshop we will analyze the pump housing shown below for its heat transfer characteristics. Specifically a plastic and an aluminum version of the housing will be analyzed using the same boundary conditions. Our goal is to compare the thermal results for each configuration.

  3. Workshop 6.1 - Assumptions Assumptions: The pump housing is mounted to a pump which is held at a constant 60 °C. We assume the mating face on the pump is also held at this temperature. The interior surfaces of the pump are held at a constant temperature of 90 °C by the fluid. The exterior surfaces are modeled using a simplified convection correlation for stagnant air at 20 °C.

  4. Workshop 6.1 – Project Schematic • Open the Project page. • From the Units menu verify: • Project units are set to “Metric (kg, mm, s, C, mA, mV). • “Display Values in Project Units” is checked (on).

  5. … Workshop 6.1 – Project Schematic • From the Toolbox, double click “Steady-State Thermal” to create a new Steady State Thermal system. • RMB the Geometry cell and “Import Geometry” – browse to the file: “Pump_housing.x_t” 1. 2.

  6. … Workshop 6.1 – Project Schematic • Double click “Engineering Data” to access material properties. • With “General Materials” highlighted click the ‘+’ next to “Aluminum Alloy” and “Polyethylene” properties to add them to the project. • “Return to Project”. 3. 4. 5.

  7. … Workshop 6.1 – Project Schematic • Drag/drop a “Steady State Thermal” system onto the “Geometry” cell in the first system. • Prior to releasing the new system the drop box should indicate cells A2 and A3 will be shared • When complete the schematic should graphically indicate this data sharing as shown here (we now have 2 “systems”, A and B). 6.

  8. … Workshop 6.1 – Project Schematic • Double click the “Model” cell in the first (A) system to open the Mechanical application. • From the Units menu choose: • “Metric (mm, kg, N, s, mV, mA)” • “Celsius (For Metric Systems)” 7. 8.

  9. Workshop 6.1 – Preprocessing Change the material and mesh on the pump housing (“Part 1”): Highlight “Part 1” under geometry. From details import the material “polyethylene”. Highlight the Mesh branch and set the mesh relevance = 100. a. b. c.

  10. Workshop 6.1 - Environment Apply temperatures (highlight the Steady State Thermal branch): Select the interior surfaces (13 faces) of the pump housing (hint: use “Extend To Limits” selection feature). RMB > Insert > Temperature. Set “Magnitude” field to 90 °C. a. b. • Select the mating surface of the pump housing. • “RMB > Insert > Temperature”. • Set “Magnitude” field to 60 °C. c. e. d. f.

  11. . . . Workshop 6.1 - Environment Apply Convection: Select the exterior (32) surfaces of the pump housing (hint: use extend to limits). “RMB > Insert > Convection”. In the “Details of Convection” click in the “Film Coefficient” field and choose “Import . . . ”. Be sure to choose import for convections. “Import” the correlation “Stagnant Air – Simplified Case”. Set the “Ambient Temperature” field to 20 °C. b. a. c. d. e.

  12. Workshop 6.1 – Solution – Model A 12. • Solve the model. • When the solution is complete insert Temperature and Total Heat Flux results (solve to evaluate results). • Results for polyethylene model. 13.

  13. Workshop 6.1 – Model B Setup • From the project schematic double click the “Model” branch in system “B” to open a second Mechanical application window. • Repeat steps 9 (a thru c) choosing “Aluminum Alloy”. • Repeat steps 10 and 11 to apply the same boundary conditions on Model B. • Repeat steps 12 and 13 to solve and view results for model B. 14.

  14. Workshop 6.1 – Solution – Model B • Results for aluminum alloy model.

  15. . . . Workshop 6.1 – Postprocessing Compare Heat Flux: Highlight the “Total Heat Flux” results from each model and switch to vector display mode. Activate vector display Control vector density Polyethylene Aluminum

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