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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Thermal and hydrodynamic performance analysis of circular microchannel heat exchanger utilizing nanofluids
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Thermal and hydrodynamic performance analysis of circular microchannel heat exchanger utilizing nanofluids

机译：利用纳米流体的圆形微通道换热器的热力学性能分析

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摘要

Purpose - The purpose of this paper is to investigate numerically the thermal and hydrodynamics performance of circular microchannel heat exchanger (CMCHE) using various nanofluids. Design/methodology/approach - The three-dimensional steady, laminar developing flow and conjugate heat transfer governing equations of a balanced MCHE are solved using finite volume method. Findings - The results are shown in terms of temperature profile, heat transfer coefficient, pressure drop, wall shear stress, pumping power, effectiveness and performance index. The addition of nanoparticles increased the heat transfer rate of the base fluids. The temperature profiles of the fluids have revealed that higher average bulk temperatures were obtained by the nanofluids compared to water. The addition of nanoparticles also increased the pressure drop along the channels slightly. The increase in nanoparticle concentrations yielded better heat transfer rate while the increase in Reynolds number decreased the heat transfer rate. Research limitations/implications - The tested nanofluids are Ag, Al_2O_3, CuO, SiO_2, and TiO_2. Reynolds number range varied from 100 to 800 and the nanoparticle concentration varied from 2 per cent to 10 per cent. Practical implications - Parallel flow in CMCHEs is used in thermal engineering applications and the design and performance analysis of these CMCHE are of practical importance. Originality/value - This paper provides the details of the thermal and hydrodynamics performance analysis of flow heat exchangers using nanofluids, which can be used for heat transfer augmentation in thermal design.
机译：目的-本文的目的是对使用各种纳米流体的圆形微通道热交换器（CMCHE）的热和流体动力学性能进行数值研究。设计/方法/方法-使用有限体积法求解平衡MCHE的三维稳态，层流显影流和共轭传热控制方程。调查结果-结果以温度曲线，传热系数，压降，壁面剪应力，泵送功率，有效性和性能指标表示。纳米颗粒的添加增加了基液的传热速率。流体的温度曲线表明，与水相比，纳米流体可获得更高的平均体温。纳米颗粒的添加也略微增加了沿通道的压降。纳米颗粒浓度的增加产生更好的传热速率，而雷诺数的增加降低传热速率。研究的局限性/意义-所测试的纳米流体是Ag，Al_2O_3，CuO，SiO_2和TiO_2。雷诺数范围从100到800不等，纳米粒子的浓度从2％到10％不等。实际意义-CMCHE中的并行流用于热工程应用中，这些CMCHE的设计和性能分析具有实际意义。原创性/价值-本文提供了使用纳米流体对流动换热器进行热力学和流体力学性能分析的详细信息，这些流体可用于热设计中的传热增强。

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