By John M. Dixon, Francis A. Kulacki
This short describes and analyzes movement and warmth shipping over a liquid-saturated porous mattress. The porous mattress is saturated via a liquid layer and heating happens from a bit of the ground. The impact on circulate styles of heating from the ground is proven via calculation, and while the heating is satisfactorily powerful, the movement is affected in the course of the porous and higher liquid layers. Measurements of the warmth move price from the heated part make certain calculations. basic warmth move legislation are built for various porous mattress depths for purposes to procedure wishes, environmental sciences, and fabrics processing. Addressing an issue of substantial curiosity to the study group, the short gains an updated literature assessment of combined convection power delivery in fluid superposed porous layers.
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Extra info for Mixed Convection in Fluid Superposed Porous Layers
Heat transfer data are recorded when the system reaches steady state, sometimes after several hours depending on the mass flow rate and wall heat flux. The overall heat transfer coefficient is determined by the usual relation, q ¼ hA (Tw À T0), where q is the power input corrected for heat losses, Tw is the average wall temperature of the heated length on the lower boundary, and T0 is the top plate temperature and the inlet temperature of the fluid. 1 C. The Nusselt and Rayleigh numbers are based on the thermophysical properties at the arithmetic average of the temperatures of heater and the top plate.
4 Results Measured Nusselt numbers exhibit the similar trends as seen in the numerical results. However, unlike the numerical results, the dimensionless parameters, particularly the Rayleigh-Darcy number, RaDa, could not be held constant for a series of runs, and thus there is a band of RaDa within which all the data points fall. 3 shows the experimental results, and the tabulated data is given in the Appendix. The measured Nusselt numbers confirm several trend seen in the numerical results. First, there is a critical Pe´clet number where the Nusselt number is a minimum.
7 are scaled to the heater length, Lh, and the stagnant thermal conductivity, km. The Rayleigh number is based on the wall heat flux. The numerical results study show excellent agreement with the experimental results in the forced convection and mixed convection regimes and good agreement with the numerical results in the free convection regime. The reason for the discrepancy could be due to either the inclusion of the Forchheimer and Brinkman terms in the present study, coupled with a higher range of Pe´clet and Rayleigh number, or the constant flux verses constant temperature boundary condition.
Mixed Convection in Fluid Superposed Porous Layers by John M. Dixon, Francis A. Kulacki