Water at 10 c enter a 2.54 cm i. d. pipe at a rate of 1.26 l/s. the pipe is 3.05 m long. if the wall temperature is held constant, at 99 c, and the water outlet temperature is 41

c. what is nusselt number for the flow? what nusselt number would you predict on the basis of the colburn analogy?

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.