Question: Water at an average bulk temperature of 10oC flows inside a channel shaped like an equilateral triangle 2.5 cm on a side. The flow rate

Water at an average bulk temperature of 10oC flows inside a channel shaped like an equilateral triangle 2.5 cm on a side. The flow rate is such that a Reynolds number of 50,000 is obtained. If the tube-wall temperature is maintained 15oC higher than the water bulk temperature, calculate the length of tube needed to effect a 10oC increase in bulk temperature. What is the total heat transfer under this condition?

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