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SIMULATING AIR FLOW THROUGH POROUS MATERIAL AS A SUBSTITUTE FOR RIBBED HEAT EXCHANGER MODEL
Abstract
The aim of the work is to achieve a successful replacement of the ribbed heat exchanger (evaporator) for later simulation of the loop thermosiphon performance for cooling the electrotechnical box. The Ansys CFD program will be used for simulation, which needs the simplest network for correct and optimal calculations. Because of the complexity and the large number of cells in the ribbed exchanger, there is just a replacement model. A porous model evaporator will be used as a replacement. For this purpose, several parameters need to be determined to determine the porous structure. The work uses two methods for determining porosity coefficients. The first ribbed heat exchanger model was used to determine the pressure loss in the intercostal space with a pre-selected rib spacing and flow air velocity ranging from 2.5 m.s-1 to 6.5 m.s-1. The pressure loss results were used in the trend line to determine the coefficients ? and C2 and in the second case for C0 and C1. In the second part, all three models are compared using CFD simulation.
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References7
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