Heat transfer from a particle in laminar flows of a variable thermal conductivity fluid

Heat transfer from a particle in laminar flows of a variable thermal conductivity fluid
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可变导热系数流体层流中颗粒的传热

DOI:
10.1016/j.ijheatmasstransfer.2021.121067
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发表时间:
2021
影响因子:
5.2
通讯作者:
Masoud, Hassan
Masoud, Hassan
中科院分区:
工程技术2区
文献类型:
--
作者:
Dehdashti, Esmaeil;Razizadeh, Meghdad;Masoud, Hassan

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我们重新审视了经典问题的稳态热传递从一个单一的粒子在一个均匀的层流与假设的流体的热导率随温度线性变化。我们使用的渐近和缩放分析的组合,推导出无量纲的传热系数,即,Nusselt数Nu,任意形状的颗粒的近似表达式。结果涵盖了整个范围内的Peclet数Pe。我们发现,对于一个恒定温度的边界条件和固定的几何形状,Nusselt数基本上等于两项的乘积,其中一项只是Pe的函数,而另一项几乎与Pe无关,并且主要取决于电导率-温度关系的比例常数.我们还表明,相比之下,当一个均匀的热通量施加在粒子的表面上,Nu可以估计为一个PE依赖件和一个只随比例常数变化的总和。
We revisit the classical problem of steady-state heat transfer from a single particle in a uniform laminar flow with the assumption that the thermal conductivity of the fluid changes linearly with the temperature. We use a combination of asymptotic and scaling analyses to derive approximate expressions for the dimensionless heat transfer coefficient, ie, the Nusselt number Nu, of arbitrarily shaped particles. The results cover the entire range of the Peclet number Pe. We find that, for a constant temperature boundary condition and fixed geometry, the Nusselt number is essentially equal to the product of two terms, one of which is only a function of Pe while the other one is nearly independent of Pe and mainly depends on the proportionality constant of the conductivity-temperature relation. We also show that, in contrast, when a uniform heat flux is imposed on the surface of the particle, Nu can be estimated as a summation of a Pe-dependent piece and one that solely varies with the proportionality constant.
DOI: --
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