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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body
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Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body

机译：含有固体体内的外壳中的铁物流体的热对流和熵生成

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Purpose-This study/paper aims to deal with thermal convection and entropy production of a ferrofluid in an enclosure having an isothermally warmed solid body placed inside. It should be noted that this research deals with a development of passive cooling system for the electronic devices. Design/methodology/approach-The domain of interest is a square chamber of size L including a rectangular solid block of sizes l_1 and l_2. Thermal convection of ferrofluid (water-Fe_3O_4 nanosuspension) is analyzed within this enclosure. The solid body is considered to be isothermal with temperature T_h and also its area is L~2/9. The vertical borders are cold with temperature T_c and the horizontal boundaries are adiabatic. The flow driven by temperature gradient in the cavity is two-dimensional. The governing equations, formulated in dimensionless primitive variables with corresponding initial and boundary conditions, are worked out by using the finite volume technique with the semi-implicit method for pressure-linked equations algorithm on a uniformly staggered mesh. The influence of nanoparticles volume fraction, aspect ratio of the solid block and an irreversibility ratio on energy transport and flow patterns are examined for the Rayleigh number Ra = 10~7. Findings-The results show that the nanoparticles concentration augments the thermal transmission and the entropy production increases also, while the augmentation of temperature difference results in a diminution of entropy production. Finally, lower aspect ratio has the significant impact on heat transfer, isotherms, streamlines and entropy. Originality/value-An efficient numerical technique has been developed to solve this problem. The originality of this work is to analyze convective energy transport and entropy generation in a chamber with internal block. To the best of the authors' knowledge, the effects of irreversibility ratio are scrutinized for the first time. The results would benefit scientists and engineers to become familiar with the analysis of convective heat transfer and entropy production in enclosures with internal isothermal blocks, and the way to predict the heat transfer rate in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors, electronics, etc.
机译：目的 - 本研究/纸张旨在处理在外壳中的铁物流体的热对流和熵产生，其具有位于内部的等温温热的固体体。应该注意的是，该研究涉及用于电子设备的被动冷却系统的开发。设计/方法/方法 - 感兴趣的领域是大小的大小L，包括矩形固体尺寸L_1和L_2。在该外壳内分析了铁磁流体的热对流（水-FE_3O_4纳米螺母）。将固体被认为是温度T_H的等温，其面积为1〜2/9。垂直边框是冷的温度T_C，水平边界是绝热的。在腔中的温度梯度驱动的流动是二维的。通过使用具有相应初始和边界条件的无量子原始变量在具有相应的初始和边界条件的控制方程，通过使用有限体积技术来解决均匀交错的网格上的压力链接方程算法的半隐式方法。对于瑞利数Ra = 10〜7，检查纳米颗粒体积分数，固体块的纵横比和不可逆比对能量传输和流动模式的影响。结果表明，纳米粒子浓度增强了热传输，熵产量也增加，而温度差的增强导致熵产生的减少。最后，较低的纵横比对传热，等温线，流线和熵具有显着影响。创意/值 - 已经开发了一种有效的数字技术来解决这个问题。这项工作的原创性是分析与内部块的腔室中的对流能量运输和熵产生。据作者所知，不可逆性比率首次审查不可逆性比率的影响。结果将使科学家和工程师受益，以熟悉内部等温块的外壳中对流传热和熵产生的分析，以及预测先进技术系统中的传热速率，工业领域在内的运输，发电，化学领域，电子等

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