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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Effects of moving wall on the flow of micropolar fluid inside a right angle triangular cavity
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Effects of moving wall on the flow of micropolar fluid inside a right angle triangular cavity

机译：移动壁对直角三角形空腔内微极性流体流动的影响

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Purpose - The main purpose of this study is to examine the effects of moving wall on the mixed convection flow and heat transfer in a right-angle triangular cavity filled with a micropolar fluid. Design/methodology/approach - It is assumed that the bottom wall is uniformly heated and the right inclined wall is cold, whereas the vertical wall is adiabatic and moving with upward/downward velocity υ_0/-υ_0, respectively. The micropolar fluid is considered to satisfy the Boussinesq approximation. The governing equations and boundary conditions are solved using the Galerkin finite element method. The Penalty method is used to eliminate the pressure term from the momentum equations. To accomplish the consistent solution, the value of the penalty parameter is taken 10~7. The simulations are performed for a wide range of Richardson number, micropolar parameter, Prandtl number and Reynolds number. Findings - The results are presented in the form of streamlines, isotherms and variations of average Nusselt number and fluid flow rate depending on the Richardson number, Prandtl number, micropolar parameter and direction of the moving wall. The flow field and temperature distribution in the cavity are affected by these parameters. An average Nusselt number into the cavity in both cases increase with increasing Prandtl and Richardson numbers and decreases with increasing micropolar parameter, and it has a maximum value when the lid is moving in the downward direction for all the physical parameters. Research limitations/implications - The present investigation is conducted for the steady, two-dimensional mixed convective flow in a right-angle triangular cavity filled with micropolar fluid. An extension of the present study with the effects of cavity inclination, square cavity, rectangular, trapezoidal and wavy cavity will be the interest of future work. Originality/value - This work studies the effects of moving wall, micropolar parameter, Richardson number, Prandtl number and Reynolds number parameter in a right-angle triangular cavity filled with a micropolar fluid on the fluid flow and heat transfer. This study might be useful to flows of biological fluids in thin vessels, polymeric suspensions, liquid crystals, slurries, colloidal suspensions, exotic lubricants, solar engineering for construction of triangular solar collector, construction of thermal insulation structure and geophysical fluid mechanics, etc.
机译：目的-这项研究的主要目的是研究在充满微极性流体的直角三角形空腔中，移动壁对混合对流和传热的影响。设计/方法/方法-假定底壁被均匀加热，右斜壁是冷壁，而垂直壁是绝热的，并且分别以向上/向下速度υ_0/-υ_0移动。认为微极性流体满足Boussinesq逼近。使用Galerkin有限元方法求解控制方程和边界条件。罚分法用于从动量方程式中消除压力项。为了完成一致的解，惩罚参数的值取10〜7。针对广泛的理查森数，微极参数，普朗特数和雷诺数进行了仿真。结果-结果以流线，等温线以及平均Nusselt数和流体流速的变化形式表示，具体取决于Richardson数，Prandtl数，微极参数和活动壁的方向。这些参数会影响型腔中的流场和温度分布。在两种情况下，进入腔的平均努塞尔数均随Prandtl和Richardson数的增加而增加，而随微极参数的增加而减小，并且当盖子沿向下方向移动时，所有物理参数均具有最大值。研究局限/含意-本研究是针对充满微极性流体的直角三角形空腔中的稳定二维混合对流进行的。通过腔倾斜，方形腔，矩形，梯形和波浪形腔的影响对本研究进行扩展将是未来工作的兴趣。原创性/价值-这项工作研究了在充满微极性流体的直角三角形空腔中，移动壁，微极性参数，理查森数，普朗特数和雷诺数参数对流体流动和传热的影响。这项研究可能对薄容器中的生物流体，聚合物悬浮液，液晶，浆料，胶体悬浮液，特殊润滑剂，三角形太阳能集热器的太阳能工程，绝热结构的构造和地球物理流体力学等的流动有用。

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