Research on Thermophysical Properties of Nanoliquids Based on SiO2 Nanoparticles for Use as a Heat-Transfer Medium in Solar-Thermal Converters


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Abstract

This paper presents an analysis of the modern state of studies of the thermophysical properties of nanofluids and the heat-transfer mechanism in them. The results of experimental studies of obtaining and determining the dynamic viscosity of the nanofluids (SiO2 + water) with various concentrations of nanoparticles are given. Nanofluids are obtained using a two-stage method in an ultrasonic field with a frequency of 20 kHz. It is shown that, in the SiO2 + water system, nanoparticles with sizes of 7, 12, and 16 nm are most stable. Various SiO2 concentrations in the volume range 0.5–5% were tested, and their thermophysical properties were studied for the purpose of using them as a heat-transfer medium in flat-plate solar collectors.

About the authors

Zh. S. Akhatov

Physical and Technical Institute Physics of the Sun

Author for correspondence.
Email: jahatov@uzsci.net
Uzbekistan, Tashkent

S. Z. Mirzaev

Institute of Ion-Plasma and Laser Technologies

Email: jahatov@uzsci.net
Uzbekistan, Tashkent

Zhiyong Wu

Solar Energy Laboratory

Email: jahatov@uzsci.net
China, Beijing

S. S. Telyaev

Solar Energy Laboratory

Email: jahatov@uzsci.net
China, Beijing

E. T. Zhuraev

Physical and Technical Institute Physics of the Sun

Email: jahatov@uzsci.net
Uzbekistan, Tashkent

T. I. Zhuraev

Physical and Technical Institute Physics of the Sun

Email: jahatov@uzsci.net
Uzbekistan, Tashkent

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