Abstract The fluid flow hydrodynamics and forced convective heat transfer in porous Cu samples manufactured by the Lost Carbonate Sintering process, with pore size 425–710 μm and porosities 0.6–0.8, have been investigated experimentally. Pressure drop and heat transfer coefficient were measured for pore-based Reynolds numbers in the range of 0.5–380. Five flow regimes, namely pre-Darcy, transition to Darcy, Darcy, transition to non-Darcy and non-Darcy, were identified. The Reynolds numbers for the flow regime boundaries increased nearly linearly with porosity. The permeability of the porous Cu samples increased and the form drag coefficient decreased with increasing porosity. Both the friction factor and the heat transfer coefficient depended strongly on the flow rate. The relationship between Nusselt number and Reynolds number showed three sections, with each section fitting well with the correlation N u = C T R e n with different CT and n values. The value of n was largely independent of porosity, except at the lowest porosity. The flow regimes had a strong effect on the heat transfer performance. The three sections of the Nusselt number vs Reynolds number curves broadly corresponded to the pre-Darcy, Darcy and non-Darcy regimes.

中文翻译：

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流态对失碳烧结多孔铜对流换热的影响

摘要 已经通过实验研究了通过失碳酸盐烧结工艺制造的孔径为 425-710 μm 和孔隙率为 0.6-0.8 的多孔铜样品中的流体流动流体力学和强制对流传热。压降和传热系数是针对基于孔隙的雷诺数在 0.5-380 范围内测量的。确定了五种流动状态，即前达西、过渡到达西、达西、过渡到非达西和非达西。流态边界的雷诺数随孔隙率几乎线性增加。随着孔隙率的增加，多孔铜样品的渗透率增加，形阻系数降低。摩擦系数和传热系数都强烈依赖于流速。努塞尔数和雷诺数之间的关系显示为三个截面，每个截面与不同 CT 和 n 值的相关性 N u = CTR en 拟合良好。除了最低孔隙率，n 的值在很大程度上与孔隙率无关。流态对传热性能有很大影响。Nusselt 数与 Reynolds 数曲线的三个部分大致对应于前达西、达西和非达西政权。