Flow behavior and heat transfer characteristics in Rayleigh-Bénard laminar convection with fluid-particle interaction
Flow behavior and heat transfer characteristics in Rayleigh-Bénard laminar convection with fluid-particle interaction
复制标题
具有流体-颗粒相互作用的瑞利-贝纳德层流对流的流动行为和传热特性
DOI：
10.1016/j.ijheatmasstransfer.2019.118840
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
Hiroshi Yamaguchi
中科院分区：
文献类型：
--
作者：
Mufeng Chen;Xiao-Dong Niu;Peng Yu;Haruhiko Yamasaki;Hiroshi Yamaguchi
本文通过实验和数值模拟研究了在瑞利数Ra ≤ 4 × 10 ~ 4范围内，在恒温场和定常流场的初始条件下，方腔内牛顿流体的Rayleigh-Bénard（R-B）层流对流。讨论了腔内自由运动颗粒对流动和换热特性的影响。当稳定的多稳定性模式共存时，即Rais超过某一临界值时，可以通过调整颗粒的初始位置来操纵最终的流动模式。如果粒子位于空腔的底部中心，则建立双胞模式，而如果粒子远离中心，则建立单胞模式。结果表明，在相同的Ra下，热性能主要取决于流型，而与颗粒的存在无关。然而，人们可以通过调整颗粒的初始位置来控制R-B对流的最终流型，从而决定热性能。
The present study experimentally and numerically investigates the Rayleigh-Bénard (R-B) laminar convection of a Newtonian fluid in a square cavity heated from the bottom wall at the initial conditions of constant temperature field and stationary flow field over the range of Rayleigh numberRa≤ 4 × 104. The effect of a freely-moving particle in the cavity on the flow pattern and heat transfer characteristics is discussed. When the stable multi-stability patterns coexist, i.e.Rais beyond a certain critical value, the final flow pattern can be manipulated by adjusting the initial position of the particle. The bicellular mode is established if the particle is located at the bottom center of the cavity while the unicellular mode is established if the particle is away from the center. The present results demonstrate that at the sameRa, the thermal performance is mainly determined by the flow pattern but not the presence of a particle. However, one can control the final flow pattern for R-B convection by adjusting the initial position of the particle, which consequently determines the thermal performance.