论文标题
在简单的剪切流中，人字微观结构增强热量和传质
Enhancement of heat and mass transfer by herringbone microstructures in a simple shear flow
论文作者
论文摘要
用晶格玻尔兹曼方法研究了简单的剪切流中的热和传质特性。确定了两个流动。第一个是在人字形结构上方的螺旋流动振荡，该结构将热量和质量从顶部平面到人字形结构上升。第二个是在人字形脊之间的凹槽中的流动再循环，从人字形尖端周围的区域加热到人字形山脊的侧壁和底部表面。这两个基本的流动运动夫妇一起形成复杂的运输机制。结果表明，当对流的热量和传质在相对较大的雷诺和施密特数量上生效时，总转移速率对施密特数的依赖性遵循了功率定律，其功率与dittus-boolter方程中的幂律师相同。随着雷诺数的增加，雷诺数总传输率的依赖性也接近了功率定律，并且功率接近dittus-boolter方程中的功率。
The heat and mass transfer characteristics in a simple shear flow over staggered herringbone structures are numerically investigated with the lattice Boltzmann method. Two flow motions are identified. The first is a spiral flow oscillation above the herringbone structures that advects heat and mass from the top plane to herringbone structures. The second is a flow recirculation in the grooves between herringbone ridges that advects heat and mass from the area around herringbone tips to the side walls of herringbone ridges and the bottom surfaces. These two basic flow motions couple together to form complex transport mechanisms. The results show that when advective heat and mass transfer takes effect at relatively larger Reynolds and Schmidt numbers, the dependence of the total transfer rate on the Schmidt number follows a power law, with the power being the same as that in the Dittus-Boelter equation for turbulent heat transfer. As Reynolds number increases, the dependence of the total transfer rate on Reynolds number also approaches a power law, and the power is close to that in the Dittus-Boelter equation.
