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Thermal Analysis

Workshop 6. Thermal Analysis. Workshop 6 - 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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Thermal Analysis

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  1. Workshop 6 Thermal Analysis

  2. Workshop 6 - 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 exposed surface temperatures for each configuration and to investigate the distribution of heat flux in the part. March 29, 2005 Inventory #002216 WS6-2

  3. Workshop 6 - Assumptions Assumptions: • The pump housing is mounted to a pump which is held at a constant 60 deg. 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 deg. C by the fluid. • The exterior surfaces are modeled using a simplified convection correlation for stagnant air at 20 deg. C. March 29, 2005 Inventory #002216 WS6-3

  4. Workshop 3 - Start Page • From the launcher start Simulation. • Choose “Geometry > From File . . . “ and browse to the file “Pump_housing.x_t”. • When DS starts, close the Template menu by clicking the ‘X’ in the corner of the window. March 29, 2005 Inventory #002216 WS6-4

  5. 4 Workshop 6 - Preprocessing • Change the part material to “Polyethylene”: • Highlight “Part1” • In the Detail window “Material” field “Import . . .” • “Choose” material “Polyethylene”. 1 2 3 • Set the working units to (M, kg, N, C, s, V, A) “Units” menu choose March 29, 2005 Inventory #002216 WS6-5

  6. 6 Workshop 6 - Environment • Highlight the Environment branch. Select the interior (13) surfaces of the pump housing (hint: use Extend Selection feature). • “RMB > Insert > Given Temperature”. • Set “Magnitude” field to 90 C. 5 7 March 29, 2005 Inventory #002216 WS6-6

  7. . . . Workshop 6 - Environment • Select the mating surface (1) of the pump housing. • “RMB > Insert > Given Temperature”. • Set “Magnitude” field to 60 C. 8 9 10 March 29, 2005 Inventory #002216 WS6-7

  8. . . . Workshop 6 - Environment • Select the exterior (32) surfaces of the pump housing (hint: use adjacent select). • “RMB > Insert > Convection”. 11 12 March 29, 2005 Inventory #002216 WS6-8

  9. 14 15 . . . Workshop 6 - Environment • In the Details change the “Type” field from “Constant” to “Temperature-Dependent”. • “Import” the correlation “Stagnant Air – Simplified Case”, if necessary. • Set the “Ambient Temperature” field to 20 deg. C. 13 March 29, 2005 Inventory #002216 WS6-9

  10. 16 17 Workshop 6 - Solution • Add temperature and total heat flux results. • Highlight the Solution branch. • “RMB > Insert > Thermal > Temperature” • Repeat the above steps to add “Total Heat Flux”. March 29, 2005 Inventory #002216 WS6-10

  11. 18 19 20 21 Workshop 6 – Duplicate Model • Before solving we will duplicate the model and specify a different material for the pump housing. This will allow us to compare the responses for each. • Highlight the “Model” branch. • “RMB > Duplicate”. • From the new branch “Model2” highlight “Part1” • In the detail window “Import” the material “Aluminum Alloy”. March 29, 2005 Inventory #002216 WS6-11

  12. 22 Workshop 6 - Solution • Highlight the “Project” branch in the tree and solve. • Note: by issuing a solve from the Project branch both Model branches will be solved. If single solutions are desired highlight only the branch to be solved before beginning the solve. March 29, 2005 Inventory #002216 WS6-12

  13. Workshop 6 - Postprocessing • When the solutions are complete, inspect the temperature plots and compare. It can be seen quickly that the choice of material in this case has a significant effect. Polyethylene Aluminum March 29, 2005 Inventory #002216 WS6-13

  14. . . . Workshop 6 - Postprocessing • A similar comparison of the heat flux in each model points up differences. Here a vector heat flux plot is shown in wireframe mode. Note how much of the energy in the aluminum model is returned via the mating face. Polyethylene Aluminum March 29, 2005 Inventory #002216 WS6-14

  15. . . . Workshop 6 - Postprocessing • To better view the exterior surface temperatures we will employ scoping as in previous workshops. • Select the outside (32) surfaces of the pump housing (use adjacent select). • “RMB > Insert > Thermal > Temperature” (note the scope of the new result now indicates “32 Faces” rather than “All Bodies” • Using RMB, copy/paste the new result into Model 2 Solution branch. Notice the scope of the result remains in tact. • Solve from the Project branch. 23 24 March 29, 2005 Inventory #002216 WS6-15

  16. . . . Workshop 6 - Postprocessing • The 2 new plots now display outside temperatures for both models. Notice the contours are not affected by interior temperatures as were the previous plots. March 29, 2005 Inventory #002216 WS6-16

  17. Workshop 6 - Reporting • If time permits, create figures to include in a report and generate the report. March 29, 2005 Inventory #002216 WS6-17

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