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首页> 外文期刊>International Journal of Heat and Mass Transfer >Enhanced convective heat transfer in lid-driven porous cavity with aspiration
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Enhanced convective heat transfer in lid-driven porous cavity with aspiration

机译：带抽吸的盖驱动多孔腔中增强的对流传热

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A scope of enhancing heat transfer during thermal convection in enclosure is explored in this work considering the free aspiration of surrounding fluid. The illustration is made using a two-sided lid-driven porous cavity under differential heating, which is expanded into possible four (assisting, opposing, upward and downward) flow-configurations. The aspiration ports are provided diagonally opposite corners for partial inflow of cold surrounding fluid and partial venting of hot cavity fluid. It leads to primary (or bottom) aspiration and depending upon the direction of sidewall motion, secondary (or top) aspiration. The resulting complex mixed-flow (shear flow, buoyant flow and aspirated flow) through porous medium is modeled by applying Brinkman-Forchheimer-Darcy model (BFDM) and Boussinesq approximation. The evolved nonlinear-coupled equations are solved by an in-house code for the wide ranges of parameters (Reynolds number Re = 10-500, Richardson number Ri = 0.1-100), Darcy number Da = 10~(−3)-10~(−7) and porosity ε = 0.1-1) rigorously. The results reveal heightened heat transfer from the aspirated cavity compared to the identical non-aspirated cavity. Depending upon the combination of the parameters, the enhancement could be as high as ∼180%. The upward-flow configuration yields the maximum heat transfer when no external baffle is used for flow partitioning during the case of top aspiration. With the baffle, the opposing flow shows the maximum heat transfer of ∼339%. The study reveals that the aspiration can magnificently enhance heat transfer without any additional expenses for pumping power of it.
机译：考虑到周围流体的自由吸入，在这项工作中探索了在外壳热对流过程中增强传热的范围。该图是使用两侧盖驱动的多孔腔在不同的加热下制成的，该腔被扩展为可能的四种（辅助，相对，向上和向下）流动配置。抽吸口设置在对角线的相对角上，以使冷的周围流体部分流入，而热腔流体的部分排出。它导致主要（或底部）抽吸，并取决于侧壁运动的方向，次要（或顶部）抽吸。通过使用Brinkman-Forchheimer-Darcy模型（BFDM）和Boussinesq逼近对通过多孔介质产生的复杂混合流（剪切流，浮力流和抽吸流）进行建模。通过内部代码对各种参数（雷诺数Re = 10-500，理查森数Ri = 0.1-100），达西数Da = 10〜（-3）-10的内部代码求解演化的非线性耦合方程式〜（−7）且孔隙率ε= 0.1-1）严格。结果表明，与相同的非吸气腔相比，吸气腔传热增强。取决于参数的组合，增强可能高达〜180％。在顶部抽吸的情况下，如果不使用外部挡板进行气流分配，则向上流动的结构将产生最大的热传递。使用挡板时，逆流显示出约339％的最大热传递。研究表明，这种抽吸可以极大地增强热传递，而无需增加泵送功率的任何额外费用。

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