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Increase in flow rate decrease in Outlet pressure.

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Old   November 2, 2017, 09:01
Default Increase in flow rate decrease in Outlet pressure.
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I've run into an interesting problem with testing a heater core system for a vehicle. I instrumented the system(instrumentation included inlet/oulet pressure, thermo couples, and flow meters). There is only one fluid path in this heater core and no leaks were observed. As i increased fluid flow through the system the pressure differential did increase, but what confused me was the outlet pressure dropped. i would assume the outlet pressure would increase with the increase or stay constant. I can't seem to explain why it would decrease. They heater core was a double pass so it has a high restriction. I don't know if that could account for outlet pressure decreasing with an increase in flow rate. assume all instrumentation is operating correctly.
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Old   December 5, 2017, 07:22
Ravindra Shende
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I know this is a late reply, but still....

Yes, you are right in thinking that the outlet pressure is decreasing because of the high restriction in the heater core.
This is because the pressure drop in a system is proportional to the square of the velocity.
So, as you increase the fluid flow, the velocity will increase linearly but the pressure drop will increase parabolically.
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flow rate, pressure drop

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