骨架发热多孔介质内单相水流动传热实验研究

针对骨架发热多孔介质内单相水流动阻力和传热特性开展了实验研究,拟合获得骨架发热多孔介质内热态流动阻力和对流换热关系式。实验参数范围是:雷诺数Re取127～394,表面热流密度12～62 kW/m2。实验结果表明:在本文研究的孔隙有效雷诺数范围内,惯性项阻力系数Rf受流动参数影响;基于骨架发热条件下获得的阻力关系式具有较好的扩展性,可以较好地预测骨架不发热条件下多种几何结构的多孔介质通道内单相水、单相蒸汽流动阻力;随着表面热流密度增大,对流换热系数不断降低;在相同热流密度条件下,随着质量流速的增大,对流换热系数也会随之增大。

Experimental Research on Single Phase Flow and Convection Heat Transfer in Heat-Generating Porous Media

An experiment was conducted to study the flow resistance and convection heat transfer char-acteristics of single phase in heat-generating porous media,within the range of Reynolds number from 127~394,and heat flux from 12~62 kW/m2.The experimental correlations of the flow resistance and convec-tion heat transfer coefficient were obtained.The experimental results indicated the effect of Reynolds number on the inertia coefficient Rf.Based on Ergun correlation,modifying the inertia coefficient,a new flow resistant calculated correlation was obtained.The correlation can well predict the flow resistance of single phase water or single phase steam in non-heat-generating porous media with multi-geometrical parameters.The experi-mental data also indicated that the convection heat transfer coefficient decreases with the increasing of heat flux,and increases with the increasing of mass flux.