Fluid friction/heat transfer irreversibility and heat function study on MHD free convection within the MWCNT–water nanofluid‐filled porous cavity

Abstract

The study comprises the effect of natural/free convection on an MWCNT–water nanofluid‐filled cavity. The porous cavity is heated/cooled to the left/right walls and the horizontal wall is maintained adiabatically. The flow behavior and entropy analysis are evaluated numerically using the finite difference approximation techniques. This study is bounded with various dimensional parameters such as ϕ $\phi $—nanoparticle concentration, Ha—Hartmann number, Ra—Rayleigh number, and Da—Darcy number. The results of the study are illustrated using ψ $\psi $—streamlines or stream function, θ $\theta $—isotherms, Π $\Pi $—heatlines or heat function, S ψ ${S}_{\psi }$—fluid friction irreversibility, S θ ${S}_{\theta }$—heat transfer irreversibility, Θ cup ${{\rm{\Theta }}}_{\mathrm{cup}}$—cup‐mixing temperature, and Θ RMSD ${{\rm{\Theta }}}_{\mathrm{RMSD}}$—root‐mean‐square deviation. Also, italicNu ${Nu}$—average Nusselt number and italicBe ${Be}$—average Bejan number are used to represent the transfer rate of heat and irreversibility of fluid friction/heat transfer, respectively. The domination of conduction on lower Ra and Da are noticed and, domination of convection on higher Ra and Da are observed using a heatline map. The fluid friction and heat transfer irreversibilities are highly noted near the vertical boundaries for increasing Rayleigh number and Darcy number.

Effect of solid obstacle and thermal conditions on convective flow and entropy generation of nanofluid filled in a cylindrical chamber

“…Kardgar (2021) examined the impact of Lorentz force on conduction-convection flow, thermal dissipation and EG of nanofluid filled in an inclined cavity. The collective effects of Lorentz force, chemical reaction and heat generation on the energy transport along with EG in a doubly stratified porous geometry have been studied by Kumar et al (2022aKumar et al ( , 2022b. Recently, the influence of magnetic field and porous medium on convective HTR and EG of MWCNT À H 2 O nanoliquid has been studied by Kumar et al (2022Kumar et al ( , 2022b for different thermal conditions and concluded that heat transfer phenomenon is lower for linear thermal profile than constant heating case.…”

Comparative analysis of entropy generation and heat transfer in a tilted partially heated square enclosure using the finite difference method

“…Selimefendigil et al (2020) investigated the forced convection of a nanofluid in a vented cavity with an elastic bottom wall while also considering the presence of an inner conductive L-shaped object and a magnetic field. Kumar et al (2022) conducted a study aimed at investigating entropy generation and heat transfer phenomena within a square porous cavity filled with MWCNT-water nanofluid, with a particular emphasis on assessing the impact of fluid friction and heat transfer irreversibility. Iftikhar et al (2023) examined how MHD affects convective flow and heat transfer characteristics in a U-shaped cavity containing both water and ferrofluid.…”

Heat and mass transfer effects on fluid past an exponentially accelerated vertical plate due to time‐fractional MHD‐free convection

“…Moreover, a detailed study of heat transfer within a natural convective enclosure filled with nanofluid/hybrid nanofluid was studied by Jino and coworkers. [52][53][54][55] Recently, Sarwar et al 56 The present study aims to explore research questions that have not been previously investigated based on the available literature. The research question includes: (1) How does time-fractional order affect the HMT characteristics of a fluid past an EAVP under MHD-free convection by using timefractional modeling?…”

“…It is noted that the Sherwood number decreases when the concentration of nanoparticles within the nanofluid increases. Moreover, a detailed study of heat transfer within a natural convective enclosure filled with nanofluid/hybrid nanofluid was studied by Jino and coworkers 52–55 . Recently, Sarwar et al 56 examined the slip effects on HMT fluid flow over an EAVP under MHD–TFNC, heat generation, and chemical reaction.…”