Numerical Study of Heat Transfer Enhancement for Low-Pressure Flows in a Square Cavity with Two Fins Attached to the Hot Wall Using Al2O3-Air Nanofluid

IF 1.2 4区工程技术 Q3 ENGINEERING, MECHANICAL

Strojniski Vestnik-Journal of Mechanical Engineering Pub Date : 2018-01-17 DOI:10.5545/sv-jme.2017.4989

W. Al-Kouz, S. Kiwan, Ammar Alkhalidi, M. Sari, Aiman Alshare

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引用次数: 31

Abstract

The gaseous low-pressure nanofluid flow of a steady-state two-dimensional laminar natural convection heat transfer in a square cavity of length L with two attached solid fins to the hot wall is numerically investigated. Such flows are found in many engineering applications, such as nuclear reactors and electronic cooling equipment. Physical parameter ranges in this study are as follows: 0 ≤ Kn ≤ 0.1, 103 ≤ Ra ≤106, 0 ≤ ϕ ≤ 0.2, LF/L takes the value of 0.5, HF takes the values of 0.25 to 0.75. Simulation results show that Nusselt number depends directly on the Rayleigh number and inversely on the Knudsen number. In addition, it is found that heat transfer will be enhanced by dispersing the nanoparticles of Al2O3 in the base low-pressure gaseous flow. Moreover, it is found that the Nusselt number of such flows increases as the nano-particle volume fraction increases for the investigated range of volume fractions considered in this study. In addition, a correlation of the Nusselt number among all the investigated parameters in this study is proposed as Nu = 0.2196 Ra0.0829 Kn–0.511 ϕ0.104.

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Al2O3-Air纳米流体对双翅片附热壁方形腔内低压流动强化传热的数值研究

采用数值模拟的方法研究了气体低压纳米流体在长为L、热壁上附有两个固体翅片的方形腔内的稳态二维层流自然对流换热。这种流动在许多工程应用中都可以找到，比如核反应堆和电子冷却设备。本研究的物理参数范围为:0≤Kn≤0.1,103≤Ra≤106,0≤φ≤0.2,LF/L取0.5,HF取0.25 ~ 0.75。仿真结果表明，努塞尔数与瑞利数成正比，与克努森数成反比。此外，发现Al2O3纳米颗粒分散在低压气体流动中，可以增强传热。此外，在本研究考虑的体积分数范围内，这种流动的努塞尔数随着纳米颗粒体积分数的增加而增加。此外，提出了本研究中所研究参数之间的努塞尔数的相关关系为:Nu = 0.2196 Ra0.0829 Kn-0.511 ϕ0.104。

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来源期刊

Strojniski Vestnik-Journal of Mechanical Engineering 工程技术-工程：机械

CiteScore

3.00

自引率

17.60%

发文量

审稿时长

4.1 months

期刊介绍： The international journal publishes original and (mini)review articles covering the concepts of materials science, mechanics, kinematics, thermodynamics, energy and environment, mechatronics and robotics, fluid mechanics, tribology, cybernetics, industrial engineering and structural analysis. The journal follows new trends and progress proven practice in the mechanical engineering and also in the closely related sciences as are electrical, civil and process engineering, medicine, microbiology, ecology, agriculture, transport systems, aviation, and others, thus creating a unique forum for interdisciplinary or multidisciplinary dialogue.