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CSME 2018/12
Volume 39 No.6
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591-597
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Numerical Simulation of Forced Convection of Turbulent Nanofluids in a Twisted Elliptical Tube
Ching-Chi Wua, Kuan-Hao Huanga, Yue-Tzu Yangb and Cha'o-Kuang Chena
aDepartment of Mechanical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan, ROC.
bDepartment of Mechanical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan, ROC..
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Abstract:
In this study, numerical calculations by the mixture model of turbulent Al2O3/water nanofluids forced convection in a three-dimensional twisted elliptical tube with constant wall temperature are investigated. Flow resistance and heat transfer characteristics of nanofluids in the twisted elliptical tube are studied with the parameters including Reynolds number, nanoparticle volume concentration, and the twist pitch. Effects of the parameters on the performance of the twisted elliptical tubes are analyzed and the overall thermal-hydraulic performance is evaluated in this study. The results show that the rotational motions are produced in the flowing nanofluid and could enhance the heat transfer performance in the twisted elliptical tubes compared with an oval tube. The average Nusselt number and the pressure drop both increase with the increasing of Reynolds number and nanoparticle volume concentration, but both decrease with the increasing of the twist pitch.
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Keywords: Mixture model; Nanofluid; Twisted elliptical tube; Heat transfer enhancement.
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©
2018
CSME , ISSN 0257-9731
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