Hot water flows with a velocity of $$0.1$$ $$m/s$$ in a $$100mm$$ long, $$0.1m$$ diameter pipe. Heat lost from the pipe outer wall is uniform and equal to $$420$$ $$W/{m^2}$$. If the inlet water temperature is $${80^ \circ }C,$$ calculate the water temp at the exit. Neglect effect of pipe wall thickness. $${C_p}$$ (water) $$=4.2$$ $$kJ/kg$$-$$K$$ and density of water $$=1000$$ $$kg/\,{m^3}.$$

GATE 1998 Mechanical Engineering PYQ — Heat Transfer

GATE 19981998PYQNATanswer pendingexplanation soonmedium

Heat Transfer · Convection

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Drill mode: forced convection · 5/8

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Recurring concept

Convection has appeared in GATE Mechanical Engineering 38 times across 23 years (2016, 2022, 2023, 2024, 2025, ...).