Characteristics of forced convection heat transfer of Co0.5Zn0.5Fe2O4 during laminar flow in a tube

IF 1.1 4区工程技术 Q4 Engineering High Temperatures-high Pressures Pub Date : 2021-01-01 DOI:10.32908/hthp.v50.1063

Y. Tong, Areum Lee, Honghyun Cho

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Abstract

The convective heat transfer characteristics of a Co0.5Zn0.5Fe2O4 nanofluid in the laminar flow region based on various concentrations are measured experimentally. The results indicate that the convective heat transfer coefficient increases with the concentration. The maximum heat transfer improved by 24.7% for the Co0.5Zn0.5Fe2O4 nanofluid at concentration 0.2wt% when the Reynolds number (Re) is 1600, compared with that of the base fluid (water/ethylene glycol (EG) = 80:20). Furthermore, the heat transfer improved by 3.6%, 16.2%, 22.5%, and 32.4% at concentrations of 0.025wt%, 0.05wt%, 0.1wt%, and 0.2wt%, respectively, when Re is 1400, compared with that of the base fluid (water/EG = 80:20). The convective heat transfer coefficient ratio of the Co0.5Zn0.5Fe2O4 nanofluid varied from 1.04 to 1.35. This means that the Co0.5Zn0.5Fe2O4 nanofluid had a larger heat transfer coefficient than the base fluid. Additionally, compared with that of the base fluid (water/EG = 80:20), the pressure drop of the Co0.5Zn0.5Fe2O4 nanofluid increased by 1.52%, 4.33%, 5.49%, and 7.32% at concentrations 0.025wt%, 0.05wt%, 0.1wt%, and 0.2wt%, respectively, when Re is 1600.

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管内层流过程中Co0.5Zn0.5Fe2O4强制对流换热特性

实验测量了不同浓度Co0.5Zn0.5Fe2O4纳米流体在层流区的对流换热特性。结果表明，对流换热系数随浓度增大而增大。当雷诺数(Re)为1600时，浓度为0.2wt%的Co0.5Zn0.5Fe2O4纳米流体的最大换热性能比基液(水/乙二醇(EG) = 80:20)提高了24.7%。此外，当Re = 1400时，与基液(水/EG = 80:20)相比，当浓度为0.025wt%、0.05wt%、0.1wt%和0.2wt%时，换热性能分别提高了3.6%、16.2%、22.5%和32.4%。Co0.5Zn0.5Fe2O4纳米流体的对流换热系数比值在1.04 ~ 1.35之间。这意味着Co0.5Zn0.5Fe2O4纳米流体比基流体具有更大的传热系数。当Re = 1600时，Co0.5Zn0.5Fe2O4纳米流体在浓度为0.025wt%、0.05wt%、0.1wt%和0.2wt%时的压降分别比基液(水/EG = 80:20)增大了1.52%、4.33%、5.49%和7.32%。

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来源期刊

High Temperatures-high Pressures THERMODYNAMICS-MECHANICS

CiteScore

1.00

自引率

9.10%

发文量

期刊介绍： High Temperatures – High Pressures (HTHP) is an international journal publishing original peer-reviewed papers devoted to experimental and theoretical studies on thermophysical properties of matter, as well as experimental and modelling solutions for applications where control of thermophysical properties is critical, e.g. additive manufacturing. These studies deal with thermodynamic, thermal, and mechanical behaviour of materials, including transport and radiative properties. The journal provides a platform for disseminating knowledge of thermophysical properties, their measurement, their applications, equipment and techniques. HTHP covers the thermophysical properties of gases, liquids, and solids at all temperatures and under all physical conditions, with special emphasis on matter and applications under extreme conditions, e.g. high temperatures and high pressures. Additionally, HTHP publishes authoritative reviews of advances in thermophysics research, critical compilations of existing data, new technology, and industrial applications, plus book reviews.