Mixed Convection Heat Transfer of Air inside a Square Vented Cavity with a Heated Horizontal Square Cylinder

Chamkha, Ali J.; Hussain, Salam Hadi; Abd-Amer, Qusay Rashid

doi:10.1080/10407782.2011.541216

Cited by 118 publications

(28 citation statements)

References 17 publications

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“…Among different parameters that dictate such thermal phenomenon Lewis number has a significant impact and this paper aims to study a particular problem in light of variation in Lewis number. The most common shapes which are extensively studied for the mixed and double diffusive condition both in steady and unsteady cases are square, rectangular, trapezoidal shaped enclosures [3][4][5]. Triangular shaped enclosures get a very little attention on this regard although triangular shaped enclosures are seen in so many practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lewis Number on Unsteady Double Diffusive Buoyancy Induced Flow in a Triangular Solar Collector with Corrugated Wall

Saha

Mojumder

Rahman

et al. 2014

Procedia Engineering

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A numerical investigation has been carried out in this paper to study the effect of varying Lewis number on the nature of heat and mass transfer in a triangular solar collector at unsteady condition. The triangular solar collector consists of two inclined glass covers and an absorber plate. The situation studied here resembles heat transfer phenomena in solar collectors and hence a thorough study on the effect of different parameters dictating this kind of heat transfer is essential. Bottom corrugated wall is subjected to high temperature and high concentration. Finite element method was employed to solve the unsteady dimensionless governing equations of continuity, momentum, energy and concentration of the problem. Calculations were carried out for Raleigh number ranging from 104 to 106 and for dimensionless time parameter = 0.1, 0.5 and 1. For the conditions mentioned here the effect of varying local and overall Nusselt and Sherwood number at those conditions are discussed. A comprehensive explanation follows each result.

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Section: Introductionmentioning

confidence: 99%

Effect of Lewis Number on Unsteady Double Diffusive Buoyancy Induced Flow in a Triangular Solar Collector with Corrugated Wall

Saha

Mojumder

Rahman

et al. 2014

Procedia Engineering

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“…Kumar et al [10] examined mixed convection in a square cavity filled with a porous medium using the multigrid method. Chamkha et al [11] a heated square solid cylinder located at the center of a ventilated cavity. Shi and Vafai [12] investigated mixed convection in an obstructed open ended cavity.…”

Section: Introductionmentioning

confidence: 99%

MHD Mixed Convection in a Lid-Driven Cavity Including Heat Conducting Solid Object and Corner Heaters with Joule Heating

Ray¹,

Chatterjee²

2014

Numerical Heat Transfer, Part A: Applications

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The hydromagnetic mixed convection flow and heat transfer in a top sided lid-driven square enclosure is numerically simulated in this paper following a finite volume approach based on the SIMPLEC algorithm. The enclosure is heated by corner heaters which are under isothermal boundary conditions with different lengths in bottom and right vertical walls. The lid is having lower temperature than heaters. The other boundaries of the enclosure are insulated. A uniform magnetic field is applied along the horizontal direction. A heat conducting horizontal solid object (a square cylinder) is placed centrally within the outer enclosure. Shear forces through lid motion, buoyancy forces due to differential heating and magnetic forces within the electrically conducting fluid inside the enclosure act simultaneously. Heat transfer due to forced flow, thermal buoyancy, Joule dissipation and conduction within the solid object are taken into account. Simulations are conducted for various controlling parameters such as the Richardson number (0.1 Ri 10), Hartmann number (0 Ha 50) and Joule heating parameter (0 J 5) keeping the Reynolds number based on lid velocity fixed as Re ¼ 100. The flow and thermal fields are analyzed through streamline and isotherm plots for various Ha, J and Ri. Furthermore, the pertinent transport quantities such as the drag coefficient, Nusselt number and bulk fluid temperature are also plotted to show the effects of Ha, J and Ri on them.

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“…The effects of buoyancy driven flow on the Nusselt number for power-law fluid [15] and the analysis of unsteady state natural convection [16,17] and the mixed convection over square cylinders [18,19] have been studied numerically. They found that the heat transfer rate of pseudo-plastic fluid is much higher than the Newtonian fluid and for dilatant fluid heat transfer rate is less than the Newtonian one.…”

Section: Introductionmentioning

confidence: 99%

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

2021

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This work is about studying the natural convection of two-dimensional steady state non-Newtonian power law fluid numerically. The inner cylinder was put eccentrically into the outer one. The cylinders are held at constant temperatures with the inner one heated isothermally at temperature Th and the outer one cooled isothermally at temperature Tc (Th>Tc). The simulations have been taken for the parameters 10 3 ≤Ra≤10 5 , 10≤Pr≤10 3 , 0.6≤n≤1.4, 0≤ɛ≤0.9 and an inclination angle ϕ from 0° up to 90°. The average Nusselt numbers for the previous parameters are obtained and discussed numerically. The results revealed that the average Nusselt number has the highest values when n=0.6, Ra=10 5 at ϕ=0 which is a signal for the large transfer herein and has the lowest values for n=1.4, Ra=10 3 at ϕ=90° which is a signal that the transfer is by conduction more than convection. Furthermore, the increasing of eccentricity causes an increase in the Nusselt number for all the cases. Finally, the best case where we can get the best heat transfer is at ϕ = 0, ɛ=0.9 among them all. The results have compared with some precedent works and showed good agreement.

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Mixed Convection Heat Transfer of Air inside a Square Vented Cavity with a Heated Horizontal Square Cylinder

Cited by 118 publications

References 17 publications

Effect of Lewis Number on Unsteady Double Diffusive Buoyancy Induced Flow in a Triangular Solar Collector with Corrugated Wall

Effect of Lewis Number on Unsteady Double Diffusive Buoyancy Induced Flow in a Triangular Solar Collector with Corrugated Wall

MHD Mixed Convection in a Lid-Driven Cavity Including Heat Conducting Solid Object and Corner Heaters with Joule Heating

Laminar natural convection of non-Newtonian power-law fluid in an eccentric annulus

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