Analysis of Mixed Convection and Free Convection in a Reduced Solar Collector Using a Nanofluid as Heat Transfer Fluid

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY
Soumia Baali Cherif, I. Rahmoune, S. Bougoul, Ali J. Chamkha
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引用次数: 0

Abstract

A three-dimensional investigation of mixed convection which occurs from Al2O3-water nanofluid flow in tube of a reduced solar collector and free convection in air gap situated between cover of solar collector and its absorber was investigated. Heat transmission by conduction in absorber and cover as well as thermal losses to exterior expressed in form of a convective flux have also been taken into account. The different transport equations were solved using CFD-Fluent software which is founded on finite volume method and Boussinesq’s law was introduced to take into account of buoyancy effects. In this investigation, thermal efficiency of solar collector was evaluated and use of nanofluids allows to increase this parameter which is generally low for this kind of thermal systems. Length of thermal regime established in the tube is proposed and this investigation is extended relative to other works developed in this research field. Results obtained gave an idea about the flow structure of the fluid under consideration in a tube of a solar collector and heat transmission mechanisms in air gap and in other elements of the solar collector. These results can facilitate design of this thermal system.
以纳米流体为传热流体的小型太阳能集热器混合对流和自由对流分析
对还原型太阳能集热器管内Al2O3水纳米流体流动和集热器盖和吸收器之间空气间隙中的自由对流产生的混合对流进行了三维研究。还考虑了吸收器和盖子中传导的热传递以及以对流通量形式表示的外部热损失。使用基于有限体积法的CFD Fluent软件求解不同的输运方程,并引入Boussinesq定律来考虑浮力效应。在这项研究中,评估了太阳能集热器的热效率,使用纳米流体可以增加这一参数,而这类热系统的热效率通常较低。提出了在管中建立的热状态的长度,并且相对于该研究领域中开发的其他工作,该研究得到了扩展。所获得的结果给出了关于所考虑的流体在太阳能收集器的管中的流动结构以及在空气间隙和太阳能收集器的其他元件中的热传递机制的想法。这些结果有利于该热力系统的设计。
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来源期刊
Journal of Nanofluids
Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-
自引率
14.60%
发文量
89
期刊介绍: Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author''s photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.
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