Question: plz help w what u can 2. Present the proper Nu correlations for the following scenarios: (30) a. Water at 20C with a mass flow

plz help w what u can plz help w what u can 2. Present the proper Nu correlations

2. Present the proper Nu correlations for the following scenarios: (30) a. Water at 20C with a mass flow rate of 1.0kg/s enters an annulus formed by an inner pipe having an OD of 2.5cm and an outer pipe having an ID of 10cm. The wall temperature of the inner pipe varies from 80C at the inlet to 100C at the outlet. The outer surface of the outer pipe is well insulated. Calculate the length of the annulus required to heat the water to 75C

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