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首页> 外文期刊>Thermal science >EXPERIMENTAL STUDY ON TURBULENT CONVECTIVE HEAT TRANSFER, PRESSURE DROP, AND THERMAL PERFORMANCE CHARACTERIZATION OF ZNO/WATER NANOFLUID FLOW IN A CIRCULAR TUBE
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EXPERIMENTAL STUDY ON TURBULENT CONVECTIVE HEAT TRANSFER, PRESSURE DROP, AND THERMAL PERFORMANCE CHARACTERIZATION OF ZNO/WATER NANOFLUID FLOW IN A CIRCULAR TUBE

机译：圆管内ZNO /水纳米流的湍流对流换热，压降和热性能表征的实验研究

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摘要

In this experimental study heat transfer and pressure drop behavior of ZnO/water nanofluid flow inside a circular tube with constant wall temperature condition is investigated where the volume fractions of nanoparticles in the base fluid are 1% and 2%. The experiments’ Reynolds numbers ranged roughly from 5000 to 30000. The experimental measurements have been carried out in the fully-developed turbulent regime. The results indicated that heat transfer coefficient increases by 11% and 18% with increasing volume fractions of nanoparticles respectively to 1% and 2% vol. The measurements also showed that the pressure drop of nanofluids were respectively 45% and145% higher than that of the base fluid for volume fractions of 1% and 2% of nanoparticles. However experimental results revealed that overall thermal performance of nanofluid is higher than that of pure water by up to 16% for 2% vol. nanofluid. Also experimental results proved that existing correlations can accurately estimate nanofluids convective heat transfer coefficient and friction factor in turbulent regime, provided that thermal conductivity, heat capacity, and viscosity of the nanofluids are used in calculating the Reynolds, Prandtl, and Nusselt numbers.
机译：在此实验研究中，研究了在壁温恒定的情况下，圆管内ZnO /水纳米流体的传热和压降行为，其中基础流体中纳米颗粒的体积分数分别为1％和2％。实验的雷诺数大约在5000到30000之间。实验测量是在充分发展的湍流状态下进行的。结果表明，随着纳米颗粒体积分数的增加，传热系数分别增加11％和18％，达到1％和2％。测量结果还表明，对于纳米粒子体积分数为1％和2％的情况，纳米流体的压降分别比基础流体高45％和145％。然而，实验结果表明，对于2％的体积，纳米流体的整体热性能比纯水高16％。纳米流体。实验结果还证明，只要将纳米流体的热导率，热容量和粘度用于计算雷诺数，普朗特数和努塞尔数，现有的相关关系就可以精确地估计湍流状态下的纳米流体对流换热系数和摩擦系数。

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