A biological fluid moves at a flow rate of m

A biological fluid moves at a flow rate of m = 0.02 kg/s through a coiled, thin-walled, 5-mm-diameter tube submerged in a large water bath maintained at 50°C. The fluid enters the tube at 25°C.

(a) Estimate the length of the tube and the number of coil turns required to provide an exit temperature of Tn,o = 38°C for the biological fluid. Assume that the water bath is an extensive, quiescent medium, that the coiled tube approximates a horizontal tube, and that the biological fluid has the thermo physical properties of water.

(b) The flow rate through the tube is controlled by a pump that experiences throughput variations of approximately ±10% at anyone setting. This condition is of concern to the project engineer because the corresponding variation of the exit temperature of the biological fluid could influence the

Biological fluid Tme m=0.02 kg/s T = 25°C Water bath -T_= 50°C Thin walled tube, D = 5 mm D, = 200 mm

Downstream process what variation would you expect in Tm.o for a ± 10% change in m?


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