Thermal conductivity analysis of Al2O3/water-ethylene glycol nanofluid by using factorial design of experiments in a natural convection heat transfer apparatus

Chemical Industry Pub Date : 2021-01-01 DOI:10.2298/hemind210520031s

P. Srinivasan, Nesakumar Dharmakkan, S. Vishnu, H. Prasath, Ramaraj Gogul

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引用次数: 3

Abstract

Thermal conductivity of a heat transfer fluid plays a significant role in improving the heat transfer performance of a heat exchanger. In this work, experiments were performed in a natural convection heat transfer apparatus by mixing homogenized Al2O3 nanoparticles in a base fluid of water-ethylene glycol mixtures. The effects of heat input, nanoparticle volume content in the base fluid, and ethylene-glycol volume content in the base fluid on thermal conductivity of the nanofluid were analyzed. Based on results obtained by MINITAB? design software (factorial design matrix), 16 experimental runs were performed with the lower and higher levels of input factors. The levels for heat input were 10 and 100 W; for nanoparticle volume content in the base fluid 0.1 and 1 vol.% and for the base fluid composition 30 and 50 vol.% of ethylene glycol in water. From the obtained experimental results, a Pareto chart, normal probability plot, contour plot and surface plot were drawn. Based on the results, a new correlation was proposed, and predictions were compared with the experimental results. From the study, the maximum thermal conductivity value 0.49 W m-1 K-1 was observed at a nanoparticle volume content in the base fluid of 1.0 vol.%, ethylene glycol volume content in the base fluid of 30 vol.% and heat input of 100 W.

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自然对流换热装置中Al2O3/水-乙二醇纳米流体的导热系数分析

换热流体的导热系数对提高换热器的换热性能起着重要的作用。在这项工作中，实验是在自然对流传热装置中进行的，通过将均匀的Al2O3纳米颗粒混合在水-乙二醇混合物的基础流体中。分析了热输入、基液中纳米颗粒体积含量和基液中乙二醇体积含量对纳米流体导热性能的影响。根据MINITAB?设计软件(析因设计矩阵)，采用不同输入因子水平分别进行16次试验。热输入水平为10和100 W;对于基液中纳米颗粒体积含量为0.1和1vol .%，对于基液组成为30和50vol .%的乙二醇在水中。根据得到的实验结果，绘制了帕累托图、正态概率图、等高线图和曲面图。在此基础上，提出了一种新的相关性，并将预测结果与实验结果进行了比较。实验结果表明，当基液中纳米颗粒体积含量为1.0 vol.%，基液中乙二醇体积含量为30 vol.%，热输入为100 W时，热导率最大值为0.49 W m-1 K-1。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chemical Industry

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