Calculate pressure drop in a trombone cooler

Ingsan · April 27, 2018, 09:43

Hi!
We are a group of students working with our bachelor thesis. Our goal is to simulate a U-tube cooler using Star CCM+.
We have got som measured values from a existing cooler; pressure, velocity, flow and temperature of the gas.

We have for the most used velocity inlet (for the two inlets) and pressure outlet, and the outlet temperature from the simulation is quite similar to our measured values.
Our problem now is that the simulated values for pressure is far away from the correct value.
We have tried to change backflow specifications to static pressure for the outlet, and we have applied the measured pressure of -1280Pa at the outlet. The simulation diverges after a few iterations.

Any suggestions on how to correctly calculate the pressure drop is appreciated. Thanks!

https://imageshack.com/a/img923/926/L1fIEk.png

cwl · May 13, 2018, 17:22

Physics, Mesh, Boundary Conditions = ?

April 27, 2018, 09:43	Calculate pressure drop in a trombone cooler	#1
Ingsan New Member Ingrid Sandvik Join Date: Mar 2018 Posts: 2 Rep Power: 0	Hi! We are a group of students working with our bachelor thesis. Our goal is to simulate a U-tube cooler using Star CCM+. We have got som measured values from a existing cooler; pressure, velocity, flow and temperature of the gas. We have for the most used velocity inlet (for the two inlets) and pressure outlet, and the outlet temperature from the simulation is quite similar to our measured values. Our problem now is that the simulated values for pressure is far away from the correct value. We have tried to change backflow specifications to static pressure for the outlet, and we have applied the measured pressure of -1280Pa at the outlet. The simulation diverges after a few iterations. Any suggestions on how to correctly calculate the pressure drop is appreciated. Thanks! https://imageshack.com/a/img923/926/L1fIEk.png

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May 13, 2018, 17:22		#2
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 435 Rep Power: 17	Physics, Mesh, Boundary Conditions = ?