An experimental/numerical hydrothermal analysis on natural convection and TiO₂-SiO₂/W-EG nanofluid’s properties in a hollow/finned cavity

Abstract

Purpose This paper aims to provide an experimental/numerical analysis of free convection within a hollow/finned cavity. Design/methodology/approach The hollow square cavity is equipped with eight active fins which have a similar configuration and different temperatures. Furthermore, four different thermal arrangements are considered to determine the order of temperature for each fin. The coupled lattice Boltzmann method is used, which not only maintains the considerable advantages of standard lattice Boltzmann method such as accuracy but also enhances the stability of this method. Findings The cavity is filled with TiO2-SiO2/Water-Ethylene Glycol nanofluid. The thermal conductivity and dynamic viscosity of nanofluid are experimentally measured using high-precision devices in six concentrations of the nanoparticle. In this study, some main parameters, including a range of Rayleigh number (103 < Ra < 106), the concentration of nanofluid (0.5 to 3 Vol.%) and thermal arrangements of fins, are considered. The effects of these main parameters on the flow, isotherms, heat transfer performance and entropy generation are studied. Originality/value The originality of this paper is combining the numerical simulation (lattice Boltzmann method) using a modern approach with experimental observations of nanofluid’s properties.

Effects of Second-Order Slip Flow and Variable Viscosity on Natural Convection Flow of CNTs − Fe

“…e impacts of mixing MgO-MWCNT hybrid nanoparticles in thermal oil were analyzed by Asadi et al [27]. Recently, Zaresharif et al [28] have undertaken hydrothermal analysis on natural convection and TiO 2 -SiO 2 /W-EG hybrid nanofluids properties.…”

Impact of periodic magnetic source on natural convection and entropy generation of ferrofluids in a baffled cavity

“…During the past two decades, a worthwhile technique for heat transfer enhancement has been used by suspending nano-scale particles with high thermal conductivity in a conventional fluid to generate stable nanofluids (Albojamal et al , 2017; Albojamal and Vafai, 2020; Zaresharif et al , 2020). Dispersion of these particles in conventional fluids is a proper and efficient method for obtaining high performance of heat transfer fluids, which led numerous investigators to replace the traditional fluids such as pure water and ethylene glycol gradually by a compact generation of fluid referred as nanofluids.…”

Simulations of micropolar nanofluid-equipped natural convective-driven flow in a cavity

“…They stated that rate of heat transfer at the bottom wall increases as opposed to variable temperature under the influence of specific temperature. Plenty of contemporary work has, suchlike, been focused on this important field in various configuration, one can assess (Aly, 2020;Atreya, 2016;Dogonchi et al, 2019;Gibanov and Sheremet, 2019;Hajizadeh et al, 2019;Haq et al, 2018;Kahshan et al, 2019;Kamiyo et al, 2010;Nazari et al, 2020;Selamat and Hashim, 2013;Souayeh et al, 2019;Uddin et al, 2020;Ullah et al, 2020;Wang et al, 2019;Yousaf and Usman, 2015;Zaresharif et al, 2020). Eringen (1966Eringen ( , 1964Eringen ( , 1972 initially suggested microfluidics theory to delineate the micromotions of fluid particles that could not be described by the classical models.…”