Free Convection on a Printed Circuit Board
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- Maude Powell
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1 LESSON 6 Free Convection on a Printed Circuit Board Objectives: Create a geometric representation of a printed circuit board. Apply thermal loading of free convection and heat fluxes to the model. Run a steady-state heat transfer analysis of the board. MSC/NASTRAN for Windows 104 Exercise Workbook 6-1
2 6-2 MSC/NASTRAN for Windows 104 Exercise Workbook
3 LESSON 6 Free Convection on PCB Model Description: Below is shown a model for a printed circuit board, complete with dimensions, material properties, and thermal loading conditions. You will create this model and analyzye it to determine the steady-state temperature distribution. Y 1.0 in 9.0 in 1.5 in 1.0 in 1.0 in 1.0 in 4.0 in 5.5 in 4.0 in 1.0 in 1.0 in 2.0 in 1.0 in 6.0 in X q = 5.0 W/in in 0.1 in h = 0.02 W/in 2 - o C T amb = 20.0 o C K pcb = W/in- o C K chip = 2.24 W/in- o C MSC/NASTRAN for Windows 104 Exercise Workbook 6-3
4 Exercise Procedure: 1. Start up MSC/NASTRAN for Windows and begin to create a new model. Double click on the icon labeled MSC/NASTRAN for Windows V On the Open Model File form, select New Model. Open Model File: New Model 2. Turn off the Geometry Engine. Tools/Advanced Geometry Standard 3. Create the materials of the model. First, create a material called pcb. Model/Material... Title: pcb Conductivity, k:.066 Next, create a material called chip. Model/Material... Title: chip Conductivity, k: 2.24 Cancel 4. Create the element properties for the model. First, create a property for the printed circuit board called pcb. Model/Property... Title: pcb 6-4 MSC/NASTRAN for Windows 104 Exercise Workbook
5 LESSON 6 Free Convection on PCB Material: Elem/Property Type... Volume Elements: 1..pcb Solid Next, create an element property for the chips called chip. Title: Material: chip 2..chip Cancel 5. Create the NASTRAN geometry for the model. First, create surfaces to represent the board and the chips. Geometry/Surface/Corners... Create the board surface: X: Y: Z: Create the first chip surface: X: Y: Z: MSC/NASTRAN for Windows 104 Exercise Workbook 6-5
6 X: Y: Z: And the second chip surface: X: Y: Z: And the third chip surface: X: Y: Z: Cancel To fit the display onto the screen, use the Autoscale feature. View/Autoscale... <CTRL A> Next, extrude the surfaces into solids. Geometry/Volume/Extrude... Select the largest surface, representing the board. 6-6 MSC/NASTRAN for Windows 104 Exercise Workbook
7 LESSON 6 Free Convection on PCB X: Y: Z: Base: Tip: Select the three small surfaces, representing the chips. X: Y: Z: Base: Tip: Cancel Your model should be like the following figure: MSC/NASTRAN for Windows 104 Exercise Workbook 6-7
8 Figure 6.1: The isometric view of the model. 6. Set the default size for the mesh. Mesh/Mesh Control/Default Size Size: Create the mesh for the model. First, turn off all labels to keep the screen from getting messy. View/Options... Quick Options MSC/NASTRAN for Windows 104 Exercise Workbook
9 LESSON 6 Free Convection on PCB Labels Off Done Apply Next, create the mesh for the pcb (the circuit board). Mesh/Geometry/Volume... Select the largest solid (the board). Property: 1..pcb Finally create the mesh for the chips. Mesh/Geometry/Volume... Select the three smaller solids (the chips). Property: 2..chip Finally, remove coincident nodes of the model. Tools/Check/Coincident Nodes... Select All When asked, to Specify Additional Range of Nodes to Merge? respond with No. No MSC/NASTRAN for Windows 104 Exercise Workbook 6-9
10 Merge Coincident Entities Your model should be like the following figure: Figure 6.2: The meshed model 8. Create the thermal loading for the model. First, a load set must first be created before creating the appropriate model loading. Model/Load/Set... Title: thermal 6-10 MSC/NASTRAN for Windows 104 Exercise Workbook
11 LESSON 6 Free Convection on PCB Next, apply a uniform default temperature to the model. Model/Load/Body... (next to Thermal options) Active Default Temperature: 20 Change the view to make applying the loads easier. View/Rotate... YZ Right <F8> Your model should be like the following figure: Figure 6.3: The model set with default temperature. MSC/NASTRAN for Windows 104 Exercise Workbook 6-11
12 Apply a heat flux to the chips in the model. Model/Load/Elemental... Hold shift and drag a box around the left edges of all chip elements. Type: Heat Flux Value: 5 Face: 2 Apply free convection to the back of the board in the model. Hold shift and drag a box around the right edges of all board elements. Type: Convection Coefficient:.02 Temperature: 20 Face: 2 Cancel Your loaded model should be like the following figure: 6-12 MSC/NASTRAN for Windows 104 Exercise Workbook
13 LESSON 6 Free Convection on PCB Figure 6.4: The loaded model. 9. Create the input file and run the analysis. File/Analyze... Analysis Type: 20..Steady-State Heat Transfer Run Analysis When asked if you wish to save the model, respond Yes. Yes MSC/NASTRAN for Windows 104 Exercise Workbook 6-13
14 File Name: Save pcb When the MSC/NASTRAN manager is through running, MSC/ NASTRAN will be restored on your screen, and the Message Review form will appear. To read the messages, you could select Show Details. Since the analysis ran smoothly, we will not bother with the details this time. Continue When asked if it is to Begin Reading File C:\TEMP\pcb.xdb, respond Yes. Yes 10. Change the display to better view the results. First, change the viewing angle. View/Rotate... Isometric <F8> Next, remove all geometry and thermal loading markers from the screen View/Options... Quick Options... Geometry Off <F6> Load - Heat Flux Load - Convection Done 11. Create a final temperature distribution contour plot. View/Select... Model Style: <F5> Quick Hidden Line 6-14 MSC/NASTRAN for Windows 104 Exercise Workbook
15 LESSON 6 Free Convection on PCB Contour Style: Deformed and Contour Data... Deformation: Contour: Contour 31..Temperature 31..Temperature In Figure 6.5, notice the temperature gradients around the chips, where all the heat is produced. When done, exit MSC/NASTRAN for Windows. File/Exit This concludes this exercise. MSC/NASTRAN for Windows 104 Exercise Workbook 6-15
16 Figure 6.5: Free convection analysis on a printed circuit board 6-16 MSC/NASTRAN for Windows 104 Exercise Workbook
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