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Two experiments were conducted on fully developed laminar flow through a tube. In both experiments surface temperature is and the mean inlet temperature is . The mean outlet temperature for the first experiment is found to be . In the second experiment the flow rate is reduced by a factor of 2. All other conditions remained the same. Determine a) The outlet temperature of the second experiment. b) The ratio of heat transfer rate for the two experiments

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ogbe2k3

Answer:

The correct answer for (a) is 0.9808 (b) 1.4545

Explanation:

Solution

Considering a small cylindrical element  as c.v and applying energy balance

we have,

hx Pdx [Ts - Tmx] = mCp dTm

∫^Tm0 ∫Tmi dTm/ Ts-Tmx = ∫^L ∫₀ P/mCp hx dx

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