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research-article

Numerical Study of Heat Transfer Enhancement of Nano Liquid-metal Fluid Forced Convection in Circular Tube

[+] Author and Article Information
Xiaoming Zhou

School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu, China; Institute of Engineering Thermophysics, Academy of Chinese Sciences, Beijing, China
zxmujs@163.com

Xunfeng Li

Institute of Engineering Thermophysics, Academy of Chinese Sciences, Beijing, China
lixunfeng@iet.cn

Keyong Cheng

Institute of Engineering Thermophysics, Academy of Chinese Sciences, Beijing, China
chengkeyong@iet.cn

Xiulan Huai

Institute of Engineering Thermophysics, Academy of Chinese Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
hxl@iet.cn

1Corresponding author.

ASME doi:10.1115/1.4039685 History: Received May 30, 2017; Revised March 11, 2018

Abstract

Investigation of nano liquid-metal fluid (consists of liquid metal Ga and nanoparticles copper) as heat transfer medium in circular tube is performed for the first time. The numerical simulations of heat transfer enhancement of nano liquid-metal fluid in a circular tube subject to a constant wall heat flux are carried out. The two-phase mixture model is used to simulate the flow of nanoparticles-liquid mixture for Reynolds number (Re) from 250 to 1000 and nanoparticles volume fraction (ap) from 0.02 to 0.1. The results show that, the average heat transfer coefficient of nano liquid-metal fluid Ga-Cu is 23.8 times of that of nanofluid water-Cu at Re=500 and ap=0.04, and the average wall shear stress of Ga-Cu is 0.0154Pa, whereas for water-Cu is 0.0259Pa. As Re increases from 250 to 1000, the average heat transfer coefficient of water-Cu is improved by 40%, whereas for Ga-Cu is 45.4%. So the nano liquid-metal fluid can be considered as an excellent heat transfer medium. Moreover, the nanoparticles volume fraction and Reynolds number on heat transfer performance of nano liquid-metal fluid are discussed.

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