Static and dynamic combined effects on the thermal conductivity of water based Ironoxide Nanofluids: experiments and theories

Arifutzzaman, A. and Ismail, Ahmad Faris and Alam, Md. Zahangir and Khan, Ahsan Ali and Aslfattahi, Navid and Saidur, R. (2021) Static and dynamic combined effects on the thermal conductivity of water based Ironoxide Nanofluids: experiments and theories. Smart Science, 9 (2). pp. 133-146. ISSN 2308-0477

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Abstract

Reasoning of particular mechanism of anomalous thermal transport behaviors is not identified yet for the nanofluids. In this research, the thermal conductivity of maghemite (MH) nanoparticles dispersed deionized water (DW) nanofluids (MH/DW) has been evaluated for the first time using the modified effective medium theories (EMTs). EMTs have been modified with the consideration of static and dynamic effects combinedly for the analysis of anomalous behaviors of thermal conductivity enhancements of the spherical nanoparticles dispersed nanofluids. MH nanoparticles (~20 nm) were synthesized using chemical co-precipitation techniques. MH/DW nanofluids were prepared with the varying MH nanoparticles loading in DW and thermal conductivity was mea�sured using KD2 pro device. The thermal conductivity enhancement (~32 %) was found to be increased linearly with the increasing MH nanoparticle concentration and nonlinearly with the increasing temperature. Existing Maxwell and Maxwell Gantt EMA (MG-EMA) models exhibited awful under-prediction from experimental thermal conductivities of MH/DW nanofluids. Modified model with considering static and dynamic mechanisms of MH nanoparticles combinedly showed reasonably very good agreement with the experimental thermal conductivities of MH/DW nano�fluids at elevated temperature. This modified model opens the new windows to analyze the insight of the thermophysical properties of various types of nanofluids by introducing potential parameters.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Nanofluids, thermal conductivity, maghemite, effective-medium-theories, combined effects
Subjects:	T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Dr. Md. Zahangir Alam
Date Deposited:	07 Dec 2021 08:16
Last Modified:	07 Dec 2021 08:16
URI:	http://irep.iium.edu.my/id/eprint/94402

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