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August 3, 2021, 03:46 |
Mass convergence within heat exchangers
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#1 |
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Join Date: Jan 2018
Posts: 31
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Hello all,
I have a toy example for heat exchanger where I am testing for different configurations to later create a lower fidelity simulation. The concern here is that althouth the flow through manifold inlet and manifold outlet conserves, the flow through tube-inlets and tube outlets doesnt! The result is shown below, where entrysection_i and exitsection_i indicate sections at tube inlets and tube outlets respectively. entrysection1 0.00034643523 entrysection2 0.0003462541 entrysection3 0.00035063147 entrysection4 0.00034650993 exitsection1 0.00035752518 exitsection2 0.00035785544 exitsection3 0.00035796402 exitsection4 0.00035505854 inlet_inmanifold:21 0.00144 outlet_outmanifold:20 -0.0014399984 One can observe that entry1 and exit1 does not match. Same goes for other 3 sections. Could someone point out, what could be the reason for this mis match? I have tried suggesting that this is due to fluid remaining within the manifolds, which leads to this difference in the mass flow rate within tube inlets and tube outlets, but apparently, I have been told, that flow in should match the flow out within the tube as well. Any pointers? The flow is turbulent (RE>3500), with standard k-epsilon model. |
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mass conservation, mass flow rate |
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