Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Chapter 10, Problem 16P
In the water pump of Problem 10.8, the pump casing acts as a diffuser, which converts 60 percent of the absolute velocity head at the impeller outlet to static pressure rise. The head loss through the pump suction and discharge channels is 0.75 times the radial component of velocity head leaving the impeller. Estimate the volume flow rate, head rise, power input, and pump efficiency at the maximum efficiency point. Assume the torque to overcome bearing, seal, and spin losses is 10 percent of the ideal torque at Q = 0.065 m3/s.
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It is proposed to build a three- stage centrifugal pump to deliver 4000 kg/min of water at a speed of 900 rpm under a total manometric head of 70 m. The vanes are to be radial at inlet and are to be curved backwards at exit at an angle of 45°. Assuming manometric efficiency of 84% and overall efficiency of 75% and considering that vane thickness accounts for 8% of circumferential area. The velocity of flow may be assumed constant at 2.5 m/sec. The width of each impeller is , The probable external diameter is , The outlet peripheral speed is , The h.p. input necessary is
It is proposed to build a three- stage centrifugal pump to deliver 4000 kg/min of water at a speed of 900 rpm under a total manometric head of 70 m. The vanes are to be radial at inlet and are to be curved backwards at exit at an angle of 45°. Assuming manometric efficiency of 84% and overall efficiency of 75% and considering that vane thickness accounts for 8% of circumferential area. The velocity of flow may be assumed constant at 2.5 m/sec. The width of each impeller is ؟
Paralel-connected double centrifugal pumps each have a specific speed of 28 and operate at 1350 rpm while delivering water with outlet velocity of flow of 3 mv's and ‘performing 82% manometric cfficicacy. The impeller outer diameter and blade angle at outlet are 0.25 m and 25 to the tangent respectively. The double pumps are replaced by series-connected four centifugal pumps 1o meet the same duty (same head and flow rate) with a specific speed of 30 for each pump. The outer diameter of the impeller s 0.5 m and passage width is 0.03 m. At exit the blades are backward curved and making an angle of 14° with tangent. Draw the velocity diagrams at nlet and outlet. Determine the manometric efficiency of each pump for the in series- connected pump system?
Chapter 10 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
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