Question: Water flows in a ( 3.0-mathrm{cm} )-diameter tube having a relative roughness of 0.002 with a constant wall temperature of ( 80^{circ} mathrm{C} ). If

Water flows in a $ 3.0-\mathrm{cm} $-diameter tube having a relative roughness of 0.002 with a constant wall temperature of $ 80^{\circ} \mathrm{C} $. If the water enters at $ 20^{\circ} \mathrm{C} $, estimate the convection coefficient for a Reynolds number of $ 10^{5} $. (Ans. $ 14878 \mathrm{~W} / \mathrm{m}^{2} \mathrm{C} $ )

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