The schematic of a test section in an experiment is shown in Figure P 4.42. The test section is a channel with a 1 mm × 2 mm rectangular cross section. Water at a temperature of 360 K flows in the...

The schematic of a test section in an experiment is shown in Figure P 4.42. The test section is a channel with a 1 mm × 2 mm rectangular cross section. Water at a temperature of 360 K flows in the test section before it enters the heated segment. The heated segment is 100 mm long. At inlet to the heated segment, the pressure is maintained at 200 kPa. The wall temperature in the heated segment is maintained at 400 K. The flow at inlet to the heated segment can be assumed to be fully developed.

a. Neglecting pressure drop in the channel, find the minimum water flow rate that is necessary to avoid bulk boiling in the heated segment.

 b. Calculate the pressure drop in the heated segment for your solution in Part a. Is your solution of Part a acceptable? If not, how would you derive a correct solution?

Assume that bulk boiling starts when liquid bulk temperature reaches saturation temperature. For simplicity, use thermally developed flow correlations.