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A liquid has its temperature raised from 15°C to 65°C by passing it through a heater...

A liquid has its temperature raised from 15°C to 65°C by passing it through a heater in which the heating surface is maintained at 125°C by condensing steam. If the overall coefficient of heat transfer can be assumed to vary as the velocity raised to the power 0.8, what will be the exit temperature of the liquid if its velocity is doubled? Assume liquid thermal properties are temperature-independent over the range concerned. [ans. 60.15 C]

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