The inlet and outlet pipelines of the centrifugal pump are hot to the touch
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Why does a centrifugal pump cause an increase in inlet and outlet temperatures when it is not operating? Is the high temperature caused by the friction between the impeller and the medium? Friction between the impeller and the medium only leads to an increase in temperature inside the impeller pump casing. Then why is the area about 1 meter away from the inlet and outlet still hot to the touch in practice? I hope experienced colleagues can provide guidance
The centrifugal pump does not operate properly when vaporization occurs due to an increase in inlet temperature. Then, gas friction does work and generates heat.
It is caused by vaporization as the inlet temperature rises, with heat generated by the frictional work of the gas.
This post was last edited by zdl1966 on 2017-10-17 at 19:15. It is likely that cavitation has occurred; the pump must be stopped to release air, then refilled with fluid before it can be restarted.
Centrifugal pumps should not operate for too long with the outlet valve closed; the repeated work done by the impeller causes the medium to reach its vaporization temperature in a short time, resulting in a drop in the gauge pressure indicated by the outlet pressure gauge! It is recommended to add a return pipeline!
The centrifugal pump itself has a pipeline that leads from the pump outlet to cool the mechanical seal; if not designed properly, it will heat up.
Without fluid flow to transfer heat, the pump’s motor is used entirely to heat the fluid, so of course the temperature will rise.
The pump is obviously empty. . . The impeller continues to do work, with no medium to carry away the heat
This must be the simplest form of heat conduction, right?=. =