14-17C In the fully +17( the velocity profile change in the flow direction? ly d

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14-17C In the fully +17( the velocity profile change in the flow direction? ly developed region of flow in a circular14-30 Water at 10C (p 9 10-3 kgins) is flowing ste pps does the velocity developed ter sprin e 1418 the mping power requi How is the friction factor for flow in a pipe related 15-m-long pipe at an average How is the pressure loss related to the (a) the pressure drop. (b) the e presure los? er requirement for a given mass flow rate? 14-19C C Discuss whether fully developed pipe flow is one- power requirement to overcor (a) 392 kPa, (b) 40.0 m, (c 0.3 lamin nateo, or three-dimensional. the pipe 14-31 Consider an air sola 5 m long and has a constant s cConsider fully developed flow in a circular pipe cover and the collector plat th negligible entrance effects. If the length of the pipe is perature of 45"C at a rate of dubled, the head loss will (a) double, (b) more than double, edge of the collector along o less than double, (d) reduce by half, or (e) remain constant. garding the entrance and rou determine the pressure drop 14-21C Consider fully developed laminar flow in a circular ripe. If the diameter of the pipe is reduced by half while the low rate and the pipe length are held constant, the head loss will (a) double. (b) triple, (c) quadruple, (d) ncrease by a factor of 8, or (e) increase by a factor of 16. 14-22C Explain why the friction factor is independent of the Reynolds number at very large Reynolds numbers. 14-23C What is turbulent viscosity? What causes it? 14-24C Consider fully developed laminar flow in a circular pipe. If the viscosity of the fluid is reduced by half by heat- ing while the flow rate is held constant, how does the head loss change? 4-25C How is head loss related to pressure loss? For FIGURE P14- en fluid, explain how you would convert head loss to pressure loss. 14-260 this flow is zero? Explain. Consider laminar flow of air in a circular pipe with ectly smooth surfaces. Do you think the friction factor for the 14-32E Heated air at n a 400-ft-long circula the head loss in the pip minimum diameter of t

Explanation / Answer

Solution:

In a fully developed boundary layer , the velocity profile doesnt change in the flow direction. It only changes in the direction perpendicular to flow direction.

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