Convective heat transfer using nanofluids play an important role in thermal applications such as heat exchangers, automotive industries, and power generation. In this work, a numerical analysis is conducted to examine the heat transfer of nanofluid in three-dimensional differentially heated cavity. The finite volume method-based SIMPLEC algorithm is used to solve the system of the mass, momentum, and energy transfer governing equations. The left and the right vertical side walls of the cube are maintained at constant temperatures and , respectively. The remaining walls of the cube are insulated. Effective thermal conductivity and viscosity of the nanofluid are determined using Brinkman and Maxwell models, respectively. Studies are carried out for three types of nanoparticles and volume fractions of nanoparticles (–). The effects of two binary liquid mixtures as a base fluid (propylene glycol-water and ethylene glycol-water) are also examined. Results show an enhancement of for Al₂O₃-EG in comparison to pure ethylene glycol in the case of . In addition, heat transfer enhancement was increased with the rise of nanoparticle volume fractions.

中文翻译：

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三维立方围护结构中纳米粒子和基础流体类型对自然对流的影响

使用纳米流体的对流传热在诸如热交换器，汽车工业和发电等热应用中起着重要作用。在这项工作中，进行了数值分析，以检查纳米流体在三维差热腔中的传热。基于有限体积法的SIMPLEC算法用于求解质量，动量和能量传递控制方程组。立方体的左右垂直侧壁保持恒温，并且，分别。立方体的其余壁是绝缘的。分别使用Brinkman和Maxwell模型确定纳米流体的有效导热率和粘度。对三种类型的纳米颗粒和纳米颗粒的体积分数（– ）进行了研究。还检查了两种二元液体混合物作为基础流体（丙二醇-水和乙二醇-水）的影响。结果表明，与纯乙二醇相比，Al ₂ O ₃ -EG的增强。另外，随着纳米颗粒体积分数的增加，传热增强也增加。