Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 17 Feb 2018 My Price 8.00

Reynolds number

7.52   A pin fin of 10-mm diameter dissipates 30 W by forced convection to air in cross flow with a Reynolds number of 4000. If the diameter of the fin is doubled and all other conditions remain the same, estimate the fin heat rate. Assume the pin to be infinitely long.

7.53   Air at 27°C and a velocity of 5 m/s passes over the small region As (20 mm X 20 mm) on a large surface, which is maintained at Ts = 127°C. For these conditions, 0.5 W is removed from the surface As. To increase the heat removal rate, a stainless steel (AISI 304) pin fin of diameter 5 mm is affixed to As, which is assumed to remain at Ts = 127°C.

 

 

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(a)    Assuming the chip to have a negligible effect on flow over the pin, what is the average convection coefficient for the surface of the pin?

(b)    Neglecting radiation and assuming the convection coefficient at the pin tip to equal that calculated in part (a), determine the pin heat transfer rate.

(c)    Neglecting radiation and assuming the convection coefficient at the exposed chip surface to equal that calculated in part (a), determine the total rate of heat transfer from the chip.

Independently determine and plot the effect of increasing  velocity  (10 V 40 m/s)  and   pin

 

 

 

diameter (2 D 4 mm) on the total rate of heat transfer from the chip. What is the heat rate  for V = 40 m/s and D = 4 mm?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Feb 2018 08:02 PM My Price 8.00

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