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Experimental analyses on heat transfer performance of TiO 2 –water nanofluid in double-pipe counter-flow heat exchanger for various flow regimes
Journal of Thermal Analysis and Calorimetry ( IF 4.4 ) Pub Date : 2019-10-12 , DOI: 10.1007/s10973-019-08887-1
R. Subramanian , A. Senthil Kumar , K. Vinayagar , C. Muthusamy

Nanofluids are widely used in heat transfer applications. This article presents the effect of heat transfer and pressure drop of the TiO2–water nanofluids flowing in a double-tube counter-flow heat exchanger with various flow patterns. In this experimental work, performance of TiO2–water nanofluid on heat transfer in three different cases such as laminar, transition and turbulent flow region were analyzed. TiO2 nanoparticles with average diameters of 20 nm dispersed in water with three volume concentrations of 0.1, 0.3 and 0.5 vol% were used as the test fluid. The results show that the heat transfer of nanofluids is higher than that of the base liquid (water) and increased with the increase in Reynolds number and particle concentrations. The heat transfer rate of nanofluid with 0.5 vol% was 25% greater than that of base liquid, and the results also show that the heat transfer coefficient of the nanofluids at a volume concentration of 0.5 vol% was 15% higher than that of base fluid at given conditions. Pressure drop of nanofluid was increased with increase in volume concentration, and it is slightly higher than that of the base fluid.

中文翻译:

不同流态下双管对流换热器中TiO 2-水纳米流体传热性能的实验分析

纳米流体被广泛用于传热应用中。本文介绍了在具有不同流型的双管对流换热器中流动的TiO 2-水纳米流体的传热和压降效应。在这项实验工作中,分析了TiO 2-水纳米流体在层流,过渡和湍流区域三种不同情况下的传热性能。二氧化钛2将平均直径为20 nm的纳米颗粒分散在水中,三种体积浓度分别为0.1、0.3和0.5 vol%。结果表明,纳米流体的传热高于基础液体(水)的传热,并且随着雷诺数和颗粒浓度的增加而增加。0.5vol%的纳米流体的传热率比基础液体大25%,并且结果还表明,体积浓度为0.5vol%的纳米流体的传热系数比基础流体高15%。在给定条件下。纳米流体的压降随着体积浓度的增加而增加,并且略高于基础流体的压降。
更新日期:2019-10-12
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