Ballistic and Collisional Flow Contributions to Anti-Fourier Heat Transfer in Rarefied Cavity Flow.
Ballistic and Collisional Flow Contributions to Anti-Fourier Heat Transfer in Rarefied Cavity Flow.
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DOI：
10.1038/s41598-018-31827-2
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发表时间：
2018-09-10
影响因子：
4.6
通讯作者：
Stefanov S
中科院分区：
文献类型：
--
作者：
Akhlaghi H;Roohi E;Stefanov S
本文采用Stefanov及其同事提出的直接模拟蒙特卡罗（DSMC）方法中的新型流动分解技术，研究了封闭在盖驱动腔体内的稀薄气体的反傅立叶传热现象。从弹道/碰撞流动分解的角度研究了从近连续区到中间过渡区具有不同流动稀疏度的等温空腔的冷-热传热。本文提出了一种新的冷-热传热指标，它是归一化热流矢量和归一化温度梯度矢量的标积，用于描述这些矢量的整体、弹道和碰撞部分。使用新的指标，弹道和碰撞流部分的温度和热流分量的贡献进行了研究，特别强调的冷到热的传热现象。我们表明，弹道和碰撞流部分有助于冷到热的传热的发生。然而，人们发现，分别考虑热传递的弹道和碰撞部分，当与相应的弹道和碰撞温度场相关时，它们对于所有程度的流动稀疏都是热到冷的。因此，冷到热的热传递是滑移和过渡努森制度中弹道和碰撞部分之间微妙相互作用的结果。
This paper investigates anti-Fourier heat transfer phenomenon in a rarefied gas confined within a lid-driven cavity using a novel flow decomposition technique in the direct simulation Monte Carlo (DSMC) method proposed by Stefanov and co-workers. An isothermal cavity with different degrees of flow rarefaction from near continuum to mid transition regimes was considered to investigate cold-to-hot heat transfer from ballistic/collision flow decomposition viewpoint. A new cold-to-hot heat transfer indicator in the form of a scalar product of normalized heat flow vector and normalized temperature gradient vector has been introduced for the overall, ballistic and collision parts of these vectors. Using the new indicator, contributions of ballistic and collision flow parts to temperature and heat flux components was investigated with a specific emphasis on the cold-to-hot heat transfer phenomenon. We demonstrated that both ballistic and collision flow parts contribute to the occurrence of cold-to-hot heat transfer. However, it was found out that considered separately both ballistic and collision parts of heat transfer, when related to corresponding ballistic and collision temperature fields, they are ever hot-to-cold for all degrees of flow rarefaction. Thus, cold-to-hot heat transfer is a result of a subtle interplay between ballistic and collision parts in the slip and transition Knudsen regimes.
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DOI：
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发表时间：
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影响因子：
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