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Unformatted text preview: (4 Re × = × = υ = − ∞ L L V which is less than the critical Reynolds number (5 10 5 × ). Thus the flow is laminar. Using the proper relation in laminar flow for Nusselt number, the average heat transfer coefficient and the heat transfer rate are determined to be C . W/m 95 . 13 ) 5 . 127 ( m 25 . C W/m. 02735 . 5 . 127 ) 7228 . ( ) 10 579 . 4 ( 664 . Pr Re 664 . 2 3 / 1 5 . 4 3 / 1 5 . ° = ° = = = × = = = Nu L k h k hL Nu L W 26.2 = C 35))(65 m C)(0.0625 . W/m 95 . 13 ( ) ( m 0.0625 = m) m)(0.25 25 . ( 2 2 conv 2 ° ° = − = = = ∞ s s s T T hA Q wL A & Considering that each transistor dissipates 3 W of power, the number of transistors that can be placed on this plate becomes 4 ⎯→ ⎯ = = 4 . 4 W 6 W 2 . 26 n This result is conservative since the transistors will cause the flow to be turbulent, and the rate of heat transfer to be higher. 723...
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Force, Mass, Power

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