Mixed convection analysis in heat transfer enhancement of a nanofluid filled porous enclosure with various wall speed ratios

Nithyadevi, N.; Begum, A. Shamadhani; Öztop, Hakan F.; Abu‐Hamdeh, Nidal H.

doi:10.1016/j.ijheatmasstransfer.2017.05.134

Cited by 42 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The contribution of both heat transfer modes then depends on the examined configuration and the considered physical parameters. As shown in several works (Nithyadevi et al , 2017; Abu-Nada, 2017; Basak and Chamkha, 2012; Gibanov et al , 2016; Raisi, 2017; Sheremet et al , 2017; Sheikholeslami and Zeeshan, 2018), the main parameters of the porous media that influence heat exchange are its porosity, permeability, the solid particles shape, their dimensions and their thermal conductivity. These studies also show that enhancement of the convective heat transfer through the saturated nanofluid porous media strongly depends on the ratio between the thermal conductivity of the solid particles constituting the porous medium and that of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Natural convective cooling of electronics contained in tilted hemispherical enclosure filled with a porous medium saturated by water-copper nanofluid

Baı̈ri

Bauzin

Martín-Garín

et al. 2019

HFF

View full text Add to dashboard Cite

Purpose The purpose of this study is to determine the thermal behavior of a hemispherical electronic device contained in a concentric hemispherical enclosure, cooled by means of free convection through a porous medium saturated with a water–copper nanofluid. Influence of various parameters on the thermal state of this device is processed in this work. The high power generated by the dome leads to a Rayleigh number varying in the 5.2 × 107-7.29 × 1010 range. The volume fraction of the monophasic nanofluid varies between 0 (pure water) and 10 per cent while the base of the hemispherical cavity (disc) is inclined between 0° (horizontal disc with dome facing upward) and 180° (horizontal disc with dome facing downward). Design/methodology/approach The three-dimensional numerical approach is carried out by means of the volume control method associated to the SIMPLE algorithm. Findings The work shows that the average temperature of the active component increases with the Rayleigh number according to a conventional law of the power type. The increase in the angle of inclination also goes with a systematic rise in the average temperature. However, increasing the ratio of the solid–fluid thermal conductivities decreases the average temperature of the component, given the respective contributions of the conductive and natural convective phenomena occurring through the nanofluid saturated porous media. The values of this ratio vary in this work between 0 (interstice between the two hemispheres without porous medium) and 70. Originality/value The correlation proposed in this work allows to calculate the temperature of the active electronic component for all the combinations of the four influence parameters which vary in wide ranges.

show abstract

Section: Introductionmentioning

confidence: 99%

Natural convective cooling of electronics contained in tilted hemispherical enclosure filled with a porous medium saturated by water-copper nanofluid

Baı̈ri

Bauzin

Martín-Garín

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

“…Introduction of a moving flat plate in the midsection of the cavity helps trigger the rate of heat transfer 11,12 . In the latest research, it has been observed that the speed ratio of the moving wall in a lid‐driven cavity leads to an increased rate of heat transfer, as established by Jmai et al 13 and Nithyadevi et al 14 …”

Section: Introductionmentioning

confidence: 90%

Analysis of mixed convection in an inclined square cavity using nanofluids with Vajjha and Das' nanofluid model

Begum

Chamkha

2021

Heat Trans

Self Cite

View full text Add to dashboard Cite

In this article, the effects of angle of inclination on heat transfer by mixed convection have been analyzed numerically in a square cavity packed with a CuO nanofluid. Cavity boundaries are constructed by having sinusoidal varying temperature on sidewalls, inactive horizontal walls, and the hot passing plate at the center of the cavity. The transport equations for fluid and heat are solved using the finite‐volume method with SIMPLE algorithm. The Richardson number (Ri) varying from 0.01 to 100, inclination angle (γ) from 0° to 90°, wall speed ratios (λ) from 0 to 3 and volume fraction of nanoparticles (φ) from 0.0 to 0.1 are given and represented in the form of flow fields, temperature fields, and mean heat transfer graphs. It is detected that the principal flow constraints have a substantial impact on the flow lines and thermal lines. Specifically, the structures of cavity inclination, existence of copper nanoparticles, and the hot wall in motion at the midpoint of the cavity are established to enrich the overall rate of heat transfer. Correspondingly, in the present study, the Vajjha and Das model is taken into account for the effective thermal conductivity and viscosity of the nanofluid; application of this model is beneficial for the industries working in a high‐temperature environment.

show abstract

“…Convective heat transfer processes, both natural and forced convection, occur in many engineering applications, and both processes are essential because of their comparable magnitude. The co-occurrence of these two processes simultaneously is known as mixed convection, in which shear and buoyancy forces are present, and the volume remains the same [1][2][3]. The flow configuration gets complicated by a lid-driven cavity that bears the blockage.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic simulation of MHD mixed convection of non-newtonian ferrofluids with a non-uniformly heated plate in an enclosure

Hossain¹,

Nag²,

Molla³

2022

Phys. Scr.

View full text Add to dashboard Cite

Mixed convective study has been popular in recent years because of its large applications, including the cooling of electronic devices, furnaces, lubrication technologies, high-performance building insulation, multi-shield structures used in nuclear reactors, food processing, glass manufacturing, solar power collectors, drying technologies, chemical processing equipment, and others involve mixed convection in a lid-driven cavity flow problems. Graphics process unit (GPU) based multiple-relaxation-time(MRT) lattice Boltzmann method (LBM) has been employed for investigating the numerical simulation of magnetohydrodynamic(MHD) mixed convection with a non-uniformly heated plate at the mid of an enclosure. The physical model consists of a two-dimensional square enclosure with the top wall moving at a constant speed. Thermally adiabatic conditions are imposed on the top and bottom walls, while the two vertical walls are cold. In the center of the enclosure, a plate has been placed that is non-uniformly heated. A magnetic field is applied with different angles of inclination. Numerical simulations were performed for various influential parameters such as Richardson number ($Ri$), Hartmann number ($Ha$), power-law index ($n$), ferroparticles volume fraction ($\phi$), magnetic field angle ($\gamma$) to study the flow phenomena in terms of the velocity and temperature distributions as well as streamlines and isotherms, respectively. The present study also investigates entropy generation due to the convective heat transfer flow for industrial purposes. The results reveal that as the Richardson number rises, the average Nusselt number rises, and as the Hartmann number rises, the average Nusselt number reduces. Furthermore, it is found that the average Nusselt number is inversely proportional to the power-law index. Total entropy generation increases with the increase of the power-law index and Richardson number. Entropy due to fluid friction, heat transfer, and total entropy shows a maximum at $\gamma=90^\circ$.

show abstract

Mixed convection analysis in heat transfer enhancement of a nanofluid filled porous enclosure with various wall speed ratios

Cited by 42 publications

References 25 publications

Natural convective cooling of electronics contained in tilted hemispherical enclosure filled with a porous medium saturated by water-copper nanofluid

Natural convective cooling of electronics contained in tilted hemispherical enclosure filled with a porous medium saturated by water-copper nanofluid

Analysis of mixed convection in an inclined square cavity using nanofluids with Vajjha and Das' nanofluid model

Mesoscopic simulation of MHD mixed convection of non-newtonian ferrofluids with a non-uniformly heated plate in an enclosure

Contact Info

Product

Resources

About