On the thermal entrance length of moderately dense gas-particle flows

On the thermal entrance length of moderately dense gas-particle flows
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中等密度气体-颗粒流的热入口长度

DOI:
10.1016/j.ijheatmasstransfer.2021.121985
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发表时间:
2022
影响因子:
5.2
通讯作者:
Capecelatro, J.
Capecelatro, J.
中科院分区:
工程技术2区
文献类型:
--
作者:
Beetham, S.;Lattanzi, A.;Capecelatro, J.

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热传递的耗散性质使热流松弛到没有温度梯度的平衡状态。达到平衡温度的距离-热入口长度-是对流扩散和混合的结果。颗粒的存在可以修改由于相间热传递和湍流调制的动量耦合的热入口长度。在这项工作中,欧拉-拉格朗日模拟被用来探测固体异质性的影响(例如,聚类)对热入口长度的影响。对于这里考虑的中等密度的系统,聚类导致热入口长度增加2-3倍,与不相关的(完全混合的)颗粒分布相比。所观察到的增加被发现主要是由于体积分数和温度波动之间的协方差,被称为流体漂移温度。使用缩放参数和基因表达式编程,封闭获得这个术语在一个一维的平均双流体方程,并被证明是准确的,在广泛的流动条件下。
The dissipative nature of heat transfer relaxes thermal flows to an equilibrium state that is devoid of temperature gradients. The distance to reach an equilibrium temperature – the thermal entrance length – is a consequence of diffusion and mixing by convection. The presence of particles can modify the thermal entrance length due to interphase heat transfer and turbulence modulation by momentum coupling. In this work, Eulerian–Lagrangian simulations are utilized to probe the effect of solids heterogeneity (e.g., clustering) on the thermal entrance length. For the moderately dense systems considered here, clustering leads to a factor of 2–3 increase in the thermal entrance length, as compared to an uncorrelated (perfectly mixed) distribution of particles. The observed increase is found to be primarily due to the covariance between volume fraction and temperature fluctuations, referred to as the fluid drift temperature. Using scaling arguments and Gene Expression Programming, closure is obtained for this term in a one-dimensional averaged two-fluid equation and is shown to be accurate under a wide range of flow conditions.
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