|
[Sponsors] |
Solar heater flow rate, natural convection convergence |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
March 23, 2017, 13:24 |
Solar heater flow rate, natural convection convergence
|
#1 |
New Member
Thomas
Join Date: Jan 2017
Posts: 14
Rep Power: 9 |
Hello there,
I find this forum very helpful and I will try to contribute more in the future. Meanwhile, I have a simple solar water heater problem and I'd appreciate if anyone could help. It's a natural convection flow inside an inclined rectangular cavity (see the attached picture for the result and boundary conditions). I have doubts in my solution for the following 2 reasons: 1) the solution did not properly converge after 8000 iterations (see picture). Gradually increasing gravity and reducing under-relaxation factors as suggested somewhere in this forum did not help either. 2) assuming that the achieved convergence is enough to get a rough estimate of the answer, the velocity inside the cavity is relatively high = 0.04 m/s (average), giving a mass flow rate of: m(dot) = rho*A*v = 1000*0.007*0.04=0.28 kg/s Thermosyphonic flow in the literature reaches around 0.02 kg/s, which is 10 times less. However, the examples that I refer to are using tubes with different area. If I calculate the velocity of 0.02 kg/s mass flow rate in the tube of 2.5cm diameter, the velocity is around 0.04 m/s, which is like the value that I get. Therefore, I am sort of right, saying that such mass flow rate is possible, considering a larger area of mine. However, the convergence makes me doubt my solution. Can I consider my simulation correct (at least within one order of magnitude)? cfd.jpg 8000.png Thank you in advance. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Issues on the simulation of high-speed compressible flow within turbomachinery | dowlee | OpenFOAM Running, Solving & CFD | 11 | August 6, 2021 07:40 |
Specify mass flow rate for periodic boundary conditions in channel flow | lion1990 | OpenFOAM Running, Solving & CFD | 1 | July 9, 2018 18:46 |
Natural convection flow between two inclined plates | Arttis | FLUENT | 6 | March 21, 2017 17:01 |
Natural convection in two phase flow | Aliset1236 | Fluent Multiphase | 0 | November 30, 2013 11:40 |
Pls help imp!! Convergence of natural convection model | laura_c | Main CFD Forum | 2 | May 15, 2013 09:03 |