Convective–radiative heat transfer in a cavity filled with a nanofluid under the effect of a nonuniformly heated plate

Abstract

Purpose The purpose of this study is to examine the radiation effect on the natural convective heat transfer of an alumina–water nanofluid in a square cavity in the presence of centered nonuniformly heated plate. Design/methodology/approach The square cavity filled with alumina–water nanofluid has a nonuniformly heated plate placed horizontally or vertically at its center. The plate is heated isothermally with linearly varying temperature. The vertical walls are cooled isothermally with a constant temperature, while the horizontal walls are insulated. The governing equations have been discretized using finite volume method on a uniformly staggered grid system. Simulations were carried out for different values of the heated plate nonuniformity parameter (λ = –1, 0 and 1), the nanoparticles solid volume fraction (Φ = 0.01 − 0.04) and the radiation parameter (Rd = 0 – 2) at the Rayleigh number of Ra = 1e+07. Findings It is found that the total heat transfer rate is enhanced with an increase in the radiation parameter for both the horizontal and vertical plates. The role of nanoparticles addition to the base fluid can have dual effects on the heat transfer rate by augmenting and dampening for the absence of radiation while it dampens the heat transfer rate for the presence of radiation. Originality/value The originality of this work is to analyze steady natural convection in a square cavity filled with a water-based nanofluid in the presence of centered nonuniformly heated plate. The results would benefit scientists and engineers to become familiar with the analysis of convective heat and mass transfer in nanofluids, and the way to predict the properties of nanofluid convective flow in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors, electronics, etc.

Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body

“…To transform the control equations into non-dimensional formulation, the following characteristics are applied (Sheremet and Sivaraj, 2018) (Table 1): …”

“…Considering the improved properties of nanofluids, the study of nanofluid-filled cavity starts to attract much more attention of engineers because of its enhancement in thermal transference and liquid circulation characteristics. Several works have been carried out on the free convection of nanosuspension-filled cavities with internal solid bodies (Mahmoodi, 2011; Rahmati and Tahery, 2018; Das et al , 2018; Ghalambaz et al , 2019; Raisi, 2017; Javed and Siddiqui, 2018; Sheremet and Sivaraj, 2018; Sheremet et al , 2019; Ma et al , 2019; Bondarenko et al , 2019a).…”

“…Governing equations are worked out by the finite element technique, and authors have revealed that the energy patterns and flow structures depend on the magnetic field rate, Ra , ferroparticles volume fraction and the aspect ratio of the square blockage. Sheremet and Sivaraj (2018) numerically analyzed the free convection and radiation energy transfer of nanoliquid in a chamber with a non-uniformly warmed plate placed within the center of the cavity. They analyzed the influence of various control characteristics such as the nanoparticles concentration, the radiation parameter and the source non-uniformity parameter.…”

Thermal convection and radiation in a rotating cabinet with time-dependent heat-generated solid element and heat-conducting solid walls

“…Often systems with electronics are involved in rotational motion, for example, in the space industry (Banerjee et al, 2009), in crystal growth (Fedyushkin, 2019;Nguyen et al, 2019) and in many other fields. Studies on convective-radiative heat transfer are well suited to solve such problems (Bahlaoui et al, 2006;Sivaraj and Sheremet, 2018;Kogawa et al, 2019). So, interaction of thermal radiation and convective energy transport in a square chamber under an influence of separate cylindrical elements has been investigated by Boukendil et al (2020).…”

Quantification of free convection within a hemispherical annulus through a porous medium saturated by water-copper nanofluid

“…It may not be generalized to other cases, in particular for cavities of different geometries as is the case with the present study (hemispherical shape) and for different Rayleigh number ranges. Interesting results concerning convective and radiative heat transfer contributions in a nanofluid filled cavity are reported by Sheremet and Chinnasamy (2018), while Sheikholeslami (2018) details the thermal phenomena occurring in a porous tilted enclosure.…”