The investigation of heat transfer enhancement by using different mixture conditions of graphene nanofluids on a downward facing surface

Shiqi Wang; Huai-En Hsieh; Zhibo Zhang; Yuan Gao; Zhe Zhou; Jia Gao

doi:10.1515/kern-2022-0028

Article

The investigation of heat transfer enhancement by using different mixture conditions of graphene nanofluids on a downward facing surface

Shiqi Wang , Huai-En Hsieh , Zhibo Zhang , Yuan Gao , Zhe Zhou and Jia Gao

Published/Copyright: June 16, 2022

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From the journal Kerntechnik Volume 87 Issue 4

Abstract

In this study, graphene nanofluids were used to explore the effect of various concentrations on boiling heat transfer of downward-facing heating. Five concentrations of graphene nanofluids were prepared for pool boiling heat transfer experiments. The experimental results show that when the mass concentration is 10 mg/L, the maximum enhancement of the CHF is up to 76.1%. In order to explore the mechanism of graphene nanofluid enhancing boiling heat transfer, after the experiment, the wettability and roughness of the heating surface were measured and the heating surface was characterized by a scanning electron microscope (SEM) and electronic differential system (EDS). The results show that the wettability is enhanced and the surface roughness is reduced. In addition, boiling curves (the curves of heat flux with surface superheat) and the curves of heat transfer coefficient with heat flux at different concentrations have also been observed to further explore the mechanism of enhanced heat transfer.

Keywords: CHF; downward-facing heating; graphene nanofluids; heat transfer

Corresponding author: Huai-En Hsieh, College of Energy, Xiamen University, No. 4221-104 Xiangan South Road, Xiamen 361002, P. R. China, E-mail: hehsieh@xmu.edu.cn

Funding source: Development Foundation of College of Energy, Xiamen University

Award Identifier / Grant number: 2018NYFZ04

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors appreciate the financial support from Development Foundation of College of Energy, Xiamen University (No. 2018NYFZ04).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-03-14

Published Online: 2022-06-16

Published in Print: 2022-08-26

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https://doi.org/10.1515/kern-2022-0028

Keywords for this article

CHF; downward-facing heating; graphene nanofluids; heat transfer