Effects of pressurization on the Enthalpy of vaporization for the SiO2 nanofluid

Baniamerian, Zahra and Jafari, Amir Sadra and Perera, Noel (2022) Effects of pressurization on the Enthalpy of vaporization for the SiO2 nanofluid. Physical Chemistry Chemical Physics, 25. pp. 673-683. ISSN 1463-9076

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Abstract

A microchannel heatsink is an advanced cooling technique to meet the cooling needs of electronic devices installed with high-power integrated circuit packages (microchips). These heat sinks utilize microchannel heat exchangers (MCHEs) with boiling-mode cooling (BMC) and nanofluids. Such MCHEs usually have high operating pressures (3-13 bar). In spite of a large number of studies on other thermo-physical properties of nanofluids, few studies have been carried out on the latent heat of evaporation (LHE) of nanofluids. The limited published literature, all report the LHE at atmospheric conditions which are outside of the operating range of MCHEs. The precise estimation of the LHE is essential for the appropriate design of the MCHEs. In the present study, a novel experimental setup is applied for the measurement of LHE in high operating pressures and temperatures (90-180°C and 80-880 kPa) and investigating the effects of pressure on LHE. It is shown that by exposing a nanofluid under pressure some new hydrogen bonds form and increase the LHE which can significantly improve the performance of boiling cooling of MCHEs. Based on the obtained results by pressurizing a 2 vol.% (4.6 wt%) SiO2 nanofluid the LHE can be increased by about 17% in comparison with a similar non-pressurized sample. On the other hand, pressurization can improve nanofluid stability. Finally, a correlation is proposed for the calculation of enthalpy of evaporation of SiO2 nanofluids.

Item Type:	Article
Identification Number:	10.1039/d2cp04517f
Dates:	Date Event 29 November 2022 Accepted 29 November 2022 Published Online
Uncontrolled Keywords:	Nanofluid, Latent Heat of Evaporation (LHE), Hydrogen bonds, Saturated pressure, Saturation temperature, Heat transfer.
Subjects:	CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-02 - mechanical engineering CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-09 - chemical, process and energy engineering CAH10 - engineering and technology > CAH10-03 - materials and technology > CAH10-03-07 - materials science
Divisions:	Faculty of Computing, Engineering and the Built Environment > College of Engineering
Depositing User:	Dr Noel Perera
Date Deposited:	22 Dec 2022 10:29
Last Modified:	20 Jun 2024 11:50
URI:	https://www.open-access.bcu.ac.uk/id/eprint/14039

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