Effect of temperature on the effective thermal conductivity of n-tetradecane-based nanofluids containing copper nanoparticles--颗粒学报PARTICUOLOGY

Jiang, H., Xu, Q., Huang, C., & Shi, L. (2015). Effect of temperature on the effective thermal conductivity of n-tetradecane-based nanofluids containing copper nanoparticles. Particuology, 22, 95-99. https://doi.org/10.1016/j.partic.2014.10.010

Effect of temperature on the effective thermal conductivity of n-tetradecane-based nanofluids containing copper nanoparticles

Haifeng Jiang, Qianghui Xu, Chao Huang, Lin Shi ^*

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2014.10.010

Volume 22, October 2015, Pages 95-99

Received 20 August 2014, Revised 10 October 2014, Accepted 11 October 2014, Available online 25 February 2015, Version of Record 4 August 2015.

E-mail: rnxsl@mail.tsinghua.edu.cn

Highlights

• Thermal conductivities of Cu/n-tetradecane nanofluid were measured at different temperatures.

• Thermal conductivity increased with Cu fraction and decreased with temperature.

• The experimental data showed good agreement with model predictions.

• The temperature dependence of nanofluid may be attributed to interfacial thermal resistance.

• Base fluid dependence of nanofluid may be attributed to Brownian motion-induced nanoconvection.

Abstract

Nanofluids were prepared by dispersing Cu nanoparticles (∼20 nm) in n-tetradecane by a two-step method. The effective thermal conductivity was measured for various nanoparticle volume fractions (0.0001–0.02) and temperatures (306.22–452.66 K). The experimental data compares well with the Jang and Choi model. The thermal conductivity enhancement was lower above 391.06 K than for that between 306.22 and 360.77 K. The interfacial thermal resistance increased with increasing temperature. The effective thermal conductivity enhancement was greater than that obtained with a more viscous fluid as the base media at 452.66 K because of nanoconvection induced by nanoparticle Brownian motion at high temperature.

Graphical abstract

Keywords

Nanofluid; Thermal conductivity; High temperature; Brownian motion

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