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You have mounted 100W PCBs as vertical fins.  The fins are 60mm deep x 60mm high x 1mm thick and made of G10 (k = 5W/mK).  The fins are spaced 6mm apart (pitch = 7mm). (Air temperature = 40oC, B = 0.017) Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), TInfinity = 25oC a) What is the Rayleigh number? b) What is the Nusselt number? c) What is the convection coefficient?

You have mounted 100W PCBs as vertical fins.  The fins are 60mm deep x 60mm high x 1mm thick and made of G10 (k = 5W/mK).  The fins are spaced 6mm apart (pitch = 7mm). (Air temperature = 40oC, B = 0.017) Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), TInfinity = 25oC a) What is the Rayleigh number? b) What is the Nusselt number? c) What is the convection coefficient?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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You have mounted 100W PCBs as vertical fins.  The fins are 60mm deep x 60mm high x 1mm thick and made of G10 (k = 5W/mK).  The fins are spaced 6mm apart (pitch = 7mm). (Air temperature = 40oC, B = 0.017)

Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), TInfinity = 25oC

a) What is the Rayleigh number?

b) What is the Nusselt number?

c) What is the convection coefficient?

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