Turbulent natural convection in a square enclosure bounded by a solid wall with localized heating

1999 ◽  
Vol 35 (5) ◽  
pp. 401-408 ◽  
Author(s):  
R. Ben Yedder ◽  
E. Bilgen
Keyword(s):  
Natural Convection ◽  
Solid Wall ◽  
Turbulent Natural Convection ◽  
Square Enclosure ◽  
Localized Heating

Effect of Wall Heat Conduction on Natural Convection Heat Transfer in a Square Enclosure

1985 ◽  
Vol 107 (1) ◽  
pp. 139-146 ◽  
Author(s):  
D. M. Kim ◽  
R. Viskanta
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Natural Convection ◽  
Solid Wall ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Square Enclosure ◽  
Void Fractions ◽  
Aspect Ratios

This paper presents numerical and experimental results for buoyancy-induced flow in a two-dimensional, fluid-filled enclosure. Rectangular cavities formed by finite conductance walls of different void fractions and aspect ratios are considered. Parametric heat transfer calculations have been performed and results are presented and discussed. Local and average Nusselt numbers along the cavity walls are reported for a range of parameters of physical interest. The temperatures in the walls were measured with thermocouples, and the temperature distributions in the air-filled cavity were determined using a Mach-Zehnder interferometer. Good agreement has been obtained between the measured and the predicted temperatures in both the solid wall and in the fluid using the mathematical model. Wall heat conduction reduces the average temperature differences across the cavity, partially stabilizes the flow, and decreases natural convection heat transfer.

Natural Convection of Viscoplastic Fluids in an Enclosure With Localized Heating and Symmetrical Cooling

2013 ◽  
Author(s):  
Mohd. Ashique Hassan ◽  
Manabendra Pathak ◽  
Mohd. Kaleem Khan
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Constant Heat Flux ◽  
Bottom Wall ◽  
Viscoplastic Fluid ◽  
Square Enclosure ◽  
Viscoplastic Fluids ◽  
Localized Heating ◽  
Side Walls ◽  
The Heat Transfer Coefficient

In this study a computational investigation of two-dimensional, steady-state, natural convection of viscoplastic fluid in a square enclosure has been presented. The enclosure has been locally heated from the bottom wall using a constant heat flux source and symmetrically cooled from both the side walls. The other walls are maintained as insulated surfaces. Finite volume based code has been used in the simulation and Bingham model has been used to model the rheology of the enclosed viscoplastic fluids. Simulations have been made for three different heating lengths of the bottom wall. The flow phenomenon and heat transfer inside the enclosure have been investigated for different properties of viscoplastic fluid, heating conditions and heated length. It has been observed that for a particular thermal condition the heat transfer coefficient or the Nusselt number decrease with the increase in yield stress value of the fluid due to weakening of convective circulation.

Turbulent Natural Convection Inside a Square Enclosure With Baffles

2010 ◽  
Author(s):  
Khudheyer S. Mushatet
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Convection Heat Transfer ◽  
Staggered Grid ◽  
Algebraic Equations ◽  
Turbulent Natural Convection ◽  
Square Enclosure ◽  
Thermal Fields ◽  
Energy Equations ◽  
Volume Method

In this paper, the turbulent natural convection heat transfer and fluid flow inside a square enclosure having two conducting solid baffles has been numerically investigated. Fully elliptic Navier-Stockes and energy equations are disrectized using finite volume method along with a staggered grid techniques. The resulting algebraic equations were solved by using semi-implicit line by line Guase elimination scheme. The effect of turbulence was incorporated to treat the regions near the walls. The flow and thermal fields are investigated for different parameters such as the relative baffles height, Rayleigh number and the distance between baffles. The conducted results indicated that the resulting vortices are decreased in number and elongated with the decrease of the dimensionless relative baffle heights. Also the results show that the rate of heat transfer is increased with the increase of Ra especially for the region near the baffles.

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