首页> 外文期刊>International Journal of Heat and Mass Transfer >A new model for the effective thermal conductivity of packed beds of solid spheroids: alumina in helium between l00 and 500deg.C
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A new model for the effective thermal conductivity of packed beds of solid spheroids: alumina in helium between l00 and 500deg.C

机译:固体球体填充床有效导热系数的新模型:氦气中的氧化铝在100至500摄氏度之间

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摘要

An analytical model is given for the thermal conductivity of a bed of solid spheroidal particles in static gas, when the conductivity of the solid is substantially greater than that of the gas. It has two fitting parameters, the width and average radius of the narrow gaps that exist between the irregularly shaped particles and which contribute significantly to the thermal conductivity. Since both parameters are physically measurable, the model holds the potential for calculating the thermal conductivity without any adjustable parameters. Agreement is excellent with measurements on alumina particles in helium at l00-500deg.C up to l00 kPa pressure.
机译:当固体的电导率显着大于气体的电导率时,给出了固体球状颗粒床在静态气体中的热导率的分析模型。它具有两个拟合参数,即不规则形状的粒子之间存在的窄间隙的宽度和平均半径,它们对导热性有很大贡献。由于这两个参数都是可物理测量的,因此该模型具有无需任何可调参数即可计算热导率的潜力。对于在100-500℃至100 kPa压力下的氦气中氧化铝颗粒的测量,该协议是极好的。

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