You are designing a PCB laid horizontally on the ground. The PCB surface temperature can’t exceed 85℃ and has a size of 96mm x 90mm. Tinfinity = 45oC. "p" is the perimeter of the plate a) Calculate the Rayleigh number. b) If the PCB is laid hot-side UP, what is the Nusselt number and heat transfer coefficient? c) If the PCB is laid hot-side DOWN, what is the Nusselt number and heat transfer coefficient? d) Given your results from b and c, which one has better heat transfer? In that case, what is the maximum power dissipation the board can put out? Properties of Air: k = 0.025 W/mk Pr = 0.72 v = 1.847 x 10−5 u = 16.84 x10−6 p = 1.2 kg/m3 B =1/ Tf (idwal gass)
You are designing a PCB laid horizontally on the ground. The PCB surface temperature can’t exceed 85℃ and has a size of 96mm x 90mm. Tinfinity = 45oC. "p" is the perimeter of the plate a) Calculate the Rayleigh number. b) If the PCB is laid hot-side UP, what is the Nusselt number and heat transfer coefficient? c) If the PCB is laid hot-side DOWN, what is the Nusselt number and heat transfer coefficient? d) Given your results from b and c, which one has better heat transfer? In that case, what is the maximum power dissipation the board can put out? Properties of Air: k = 0.025 W/mk Pr = 0.72 v = 1.847 x 10−5 u = 16.84 x10−6 p = 1.2 kg/m3 B =1/ Tf (idwal gass)
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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You are designing a PCB laid horizontally on the ground. The PCB surface temperature can’t exceed 85℃ and has a size of 96mm x 90mm.
- Tinfinity = 45oC.
- "p" is the perimeter of the plate
a) Calculate the Rayleigh number.
b) If the PCB is laid hot-side UP, what is the Nusselt number and heat transfer coefficient?
c) If the PCB is laid hot-side DOWN, what is the Nusselt number and heat transfer coefficient?
d) Given your results from b and c, which one has better heat transfer? In that case, what is the maximum power dissipation the board can put out?
Properties of Air:
k = 0.025 W/mk
Pr = 0.72
v = 1.847 x 10−5
u = 16.84 x10−6
p = 1.2 kg/m3
B =1/ Tf (idwal gass)
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