Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Wong, Kok Cheong; Saeid, Nawaf H.

doi:10.1016/j.icheatmasstransfer.2008.10.008

Cited by 27 publications

(7 citation statements)

References 16 publications

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“…To validate the new proposed UDF a test case has been accomplished solving the above equations for an impinging jet on a heated wall in a open cavity filled with a porous foam, analyzed by Wong in [38]. The results, given in Fig.…”

Section: Numerical Modelmentioning

confidence: 99%

Local Thermal Non-Equilibrium in Mixed Convection in Channels Partially Heated at Uniform Heat Flux Filled With a Porous Medium

Buonomo

Manca

Mesolella

et al. 2014

Volume 3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics

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A numerical analysis of mixed convection in a vertical channel filled with metal foam partially heated at uniform heat flux is studied numerically. Local thermal non-equilibrium and Brinkman-Forchheimer-extended Darcy model are assumed. Boussinesq approximation with constant thermophysical proprieties are considered. Results are carried out for an aluminium foam with 10 pore per inch (PPI) and ε=0.909, the fluid is air. Results, for different Reynolds numbers and geometrical aspect ratios, are given in terms of solid and fluid temperatures, at heated walls and inside the channel at several heights, velocity profile along the channel, local and average Nusselt numbers. Results show that diffusive effect resulted lower temperature values inside the solid and the fluid temperatures are higher in all considered cases. For heated channel with smaller aspect ratios, an average Nusselt number increase is found for solid and fluid phases.

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Section: Numerical Modelmentioning

confidence: 99%

Local Thermal Non-Equilibrium in Mixed Convection in Channels Partially Heated at Uniform Heat Flux Filled With a Porous Medium

Buonomo

Manca

Mesolella

et al. 2014

Volume 3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics

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“…The flow visualization reveals that for Re = 100, there are two nearly distinct fluid motion such as a parallel flow in the channel and a recirculation flow inside the cavity. Wong and Saeid [12] numerically investigated the opposing mixed convection arising from jet impingement which was intended to cool the heated bottom surface of an open cavity in a horizontal channel filled with porous medium. Pop et al [13] examined the natural convection in a partially opened enclosure filled with porous media using the Brinkman-Forchheimer model.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical Investigation of Mixed Convection Heat Transfer from Block Mounted on a Cavity

et al. 2014

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This work aims to numerically investigate the mixed convective flow over a three-dimensional cavity that lies under the horizontal channel with a vertical heat source projecting from the bottom of the cavity. This investigation is progressed by establishing the boundary conditions of the walls of vertical heat source as isothermal, while backward and the forward facing steps as isothermal at ambient temperatures and the rest of the walls are adiabatic. The flow is laminar and incompressible in the cubic geometry. A numerical simulation is undertaken to investigate the flow structure, heat transfer characteristics and the complex interaction between the induced stream flow at ambient temperature and buoyancy-induced flow from the walls of the heated source. The numerical simulations are performed using commercial CFD codes. The numerical codes are validated with previously published benchmark results. The study is performed for three different Reynolds numbers (100, 500 and 1,000) and subsequently for three different Richardson numbers (0.1, 1 and 10) for each Reynolds number. The height of the vertical heat source is kept constant for all the abovementioned cases. A special case is undertaken to study the

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“…A great number of research studies have been performed for thermal convection in open square cavities. Some examples of the considered investigations can be found in Chan and Tien (1985); Bilgen and Oztop (2005); Hinojosa et al (2005); Bilgen and Muftuoglu (2008); Mohamad (1995); Wong and Saeid (2009); Angirasa et al (2015); Chen et al (2018). Free convection appears within open chambers having inner heat-conducting or isothermal elements that can be met very often in practice.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body

Chinnasamy

Vignesh

Sheremet

2021

HFF

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Purpose The study aims to investigate magnetohydrodynamics thermal convection energy transference and entropy production in an open chamber saturated with ferrofluid having an isothermal solid block. Design/methodology/approach Analysis of thermal convection phenomenon was performed for an open chamber saturated with a nanofluid having an isothermal solid unit placed inside the cavity with various aspect ratios. The left border temperature is kept at Tc. An external cooled nanofluid of fixed temperature Tc penetrates into the domain from the right open border. The nanofluid circulation is Newtonian, incompressible, and laminar. The uniform magnetic field of strength B at the tilted angle of γ is applied. The finite volume technique is used to work out the non-linear equations of liquid motion and energy transport. For Rayleigh number (Ra=1e+7), numerical simulations were executed for varying the solid volume fractions of the nanofluid (ϕ = 0.01–0.04), the aspect ratios of a solid body (As = 0.25–4), the Hartmann number (Ha = 0–100), the magnetic influence inclination angle (γ = 0–π/2) and the non-dimensional temperature drop (Ω = 0.001–0.1) on the liquid motion, heat transference and entropy production. Findings Numerical outcomes are demonstrated by using isolines of temperature and stream function, profiles of mean Nusselt number and entropy generations. The results indicate that the entropy generation rate and mean Nu can be decreased with an increase in Ha. The inner solid block of As = 0.25 reflects the maximum heat transfer rate in comparison with other considered blocks. The addition of nano-sized particles results in a growth of energy transport and mean entropy generations. Originality/value An efficient computational technique has been developed to solve natural convection problem for an open chamber. The originality of this research is to scrutinize the convective transport and entropy production in an open domain with inner body. The outcomes would benefit scientists and engineers to become familiar with the investigation of convective energy transference and entropy generation in open chambers with inner bodies, and the way to predict the energy transference strength in the advanced engineering systems.

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Numerical study of mixed convection on jet impingement cooling in an open cavity filled with porous medium

Cited by 27 publications

References 16 publications

Local Thermal Non-Equilibrium in Mixed Convection in Channels Partially Heated at Uniform Heat Flux Filled With a Porous Medium

Local Thermal Non-Equilibrium in Mixed Convection in Channels Partially Heated at Uniform Heat Flux Filled With a Porous Medium

Numerical Investigation of Mixed Convection Heat Transfer from Block Mounted on a Cavity

Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body

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