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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experiments on mixed convection in a vented differentially side-heated cavity filled with a coarse porous medium
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Experiments on mixed convection in a vented differentially side-heated cavity filled with a coarse porous medium

机译：充有粗糙多孔介质的排气侧热腔中混合对流的实验

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This paper reports on an experimental study of mixed convection flow and heat transfer in a vented, differentially side-heated cubical cavity filled with a porous medium consisting of relatively large solid low-conductivity spheres. Rayleigh numbers and Reynolds numbers are varied over the ranges 6 × 10~6 < Ra < 7 × 10~7 and 240 < Re < 4250, respectively, for a fixed Prandtl number of Pr = 6.75, thus covering more than three decades in Richardson numbers Ri = Ra/(Re~2 Pr). Heat transfer measurements were combined with measurements of the velocity field (using particle image velocimetry) and the temperature field (using liquid crystal thermography) to better understand the dependence of the Nusselt number, Nu, on the Richardson number. We observed three different flow and heat transfer regimes depending on the Richardson number. For Ri < 10, the flow structure and the Nusselt number scaling are similar to those for the pure forced convection, i.e., the Nusselt number scales as Nu - Re061 independent of Rayleigh number. For Ri > 40, natural convection dominates the flow in the vicinity of the heating wall. The Nusselt number becomes less sensitive to the Reynolds number and is mainly determined by the Rayleigh number. In the intermediate regime for 10 < Ri < 40, the upward directed natural convection flow at the heating wall competes with the downward directed forced flow leading to a minimum effective Nusselt number. A Nusselt number correlation is derived that is valid in the range 0.1 < Ri < 100 covering all three regimes.
机译：本文报道了对流对流和传热混合的实验研究，该对流是在通风的，侧向加热的立方腔体中进行的，该腔体填充有由相对较大的固体低电导率球体组成的多孔介质。对于固定的Prandtl数Pr = 6.75，瑞利数和雷诺数分别在6×10〜6 40时，自然对流在加热壁附近占主导地位。 Nusselt数对Reynolds数的敏感性降低，并且主要由Rayleigh数确定。在10

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