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A numerical investigation is conducted to analyze the steady flow and thermal fields as well as heat transfer characteristics in a vented square cavity with a built-in heat conducting horizontal solid circular obstruction. Hydrodynamic behavior, thermal characteristics and heat transfer results are obtained by solving the couple of Navier-Stokes an...
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... transfer in a cavity along with a heat conducting body. To the best of the authors' knowledge, limited work has been done in a vented enclosure containing a solid circular cylinder. The main objective of the present study is to examine the effect of Reynolds number and Prandtl number on fluid flow and heat transfer in a ventilated square cavity. Fig. 1 shows the geometry of the present work. The problem deals with a heat conducting solid circular cylinder with a diameter d and thermal conductivity k s located at the center of a square ventilated cavity with sides of length L. The right vertical wall of the square cavity is placed at the constant temperature T h but other walls of the ...
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Citations
... It was observed that these parameters have a considerable impact on both the thermal and flow fields. MC in cavities containing simple heat-conducting bodies (obstacles) has been studied in the references [10][11][12]. ...
In this study, thermal radiation and mixed convection in a ventilated horizontal channel are analyzed. The channel contains five cylindrical blocks that produce different volumetric heat rates. The channel is ventilated by two openings; the inlet is located on the left wall, and the outflow is on the top one. All the channel walls are adiabatic, except for the upper wall, which is held at a constant low temperature of T C = 20°C. To numerically solve the differential equations governing the current problem, a numerical code based on the finite volume approach and the SIMPLE algorithm is utilized. The discrete ordinate method is used to discretize the radiative transfer equation. The impacts of the Reynolds number and the emissivity of the surfaces on the heat transfer and fluid flow are analyzed. The numerical simulations indicate that increasing the Reynolds number or the emissivity considerably decreases the maximum temperature in the cavity and improves the performance of the considered system.
... The results showed that the obstacle has significant effects on the flow field at the pure mixed convection region and on the thermal field at the pure forced convection region. Rahman et al. [6] made a numerical work effects of Reynolds and Prandtl numbers on mixed convection in an obstructed vented cavity. Rahman et al. [7] Optimization of mixed convection in a lid-driven enclosour with a heat generating circular body. ...
... There is a big challenge on cooling of electronic equipments to enhance efficiency of these devices as indicated by Nasrin [1], Hsu and How [2], Kieno et al. [3], House et al. [4], Dong and Li [5]. A numerical investigation of mixed convection in a ventilated square cavity with a heat conducting horizontal solid circular cylinder has been performed by Rahman et al. [6]. In rectangular cavities at different phase ratios, Gau et al. [7] conducted mixed convection with moving isothermal side walls and constant flux as a heat source on the bottom wall. ...
This study investigated the effects of the aspect ratio of the cavity for average fluid temperature at exit port, average Nusselt number, maximum temperature of the fluid in the domain, drag coefficient, isotherms and streamlines on behalf of different Hartmann numbers and Rayleigh numbers. Solution of governing equations of momentum and energy has been made by finite element technique. Above mentioned parameters such as an aspect ratio which is cavity height to cavity length change from Ar = 0.5 to 2 for different Rayleigh numbers and Hartmann numbers which change from Ra = 10 3 to 10 5 and Ha = 0 to 50 respectively. Prandtl number Pr = 7 and Reynolds number Re = 100 is fixed in this simulation . It is found that variation of the aspect ratio makes an important effect for higher values of Rayleigh numbers. Heat transfer enhances with increasing of aspect ratio. Increasing of Hartmann number decreases the heat transfer inside the cavity. Keywords: Temperature boundary conditions; Open cavity; Aspect ratio; Finite element methods. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i2.14505 J. Sci. Res. 6 (2), 243-256 (2014) Normal 0 false false false EN-US X-NONE X-NONE
... A numerical investigation was conducted to analyze the steady flow and thermal fields as well as heat transfer characteristics in a vented square cavity with a built-in heat conducting horizontal solid circular obstruction by M. M. Rahman et al [24]. M.M. Billah et al [25] executed a numerical study to analyze the effects of Reynolds' and Prandtl number on mixed convective flow and heat transfer characteristics inside a ventilated cavity in presence of a heat-generating solid circular obstacle placed at the centre. The characteristics of transition from laminar to chaotic mixed convection in a twodimensional multiple ventilated cavity was analyzed in a numerical study conducted by Ming Zhao et al [26]. ...
___________________________________________________ ABSTRACT Laminar double-diffusive mixed convective flow in ventilated rectangular cavity in the presence of heat and mass generating square solid placed at the center of the bottom wall was numerically investigated. An external Newtonian fluid flow enters the cavity through an opening at the top of the left vertical wall and exits from another opening at the bottom of the right vertical wall, which is creating the forced convection flow conditions. Laminar regime is considered under steady state condition. The governing equations including continuity, momentum, energy and species transfer are transformed into non-dimensional form and the resulting partial differential equations are solved by the finite volume technique. A parametric study presenting the influence of Reynolds' number (Re), Richardson number (Ri), heat generation (ϕ) and angle of inlet fluid (γ) effect on the fluid velocity, temperature, concentration, as well as average Nusselt number and is done. This numerical study is conducted for constant Prandtl number, Pr=0.7; aspect ratio, A=2, Lewis number, Le=2 and Buoyancy ratio, N=0.5. Computations are carried out for Reynolds' number ranging from 100 to 1000, Richardson number ranging from 0.1 to 10, angle of inlet fluid range of 0° ≤ γ ≤ 30°, and dimensionless heat generation coefficient range of 0.5 ≤ íµí± ≤ 2.5. NOMENCLATURE A Aspect ratio, H/L. C * Dimensionless vapour concentration. c Vapour concentration. c i Concentration of the fluid at inlet port of the cavity. c s Concentration of the fluid at the three sides the mass source. D Mass diffusivity, m 2 /s. H Cavity height, m. k Thermal conductivity, W/m K. K Solid fluid thermal conductivity ratio, k s /k f. k f Fluid thermal conductivity, W/m K. k s Solid thermal conductivity, W/m K.. Page 243 L Cavity width, m. N Buoyancy ratio. Nu Average Nusselt number. Nu l Local Nusselt number. p Pressure, N/m 2 . P * Dimensionless pressure, P * = pL 2 /ρ ∞ α 2 . íµí° • The rate of heat generation, W/m 3 C. U i Fluid Velocity at the inlet port, m/s. U o Fluid Velocity at the exit port, m/s. T Local Temperature, C. T i Temperature at the inlet port of the cavity, C. Ts Temperature at the three sides of the heat source, C. ΔT Temperature difference,T s –T i , C. u Velocity components in x-direct on, m/s. U * Dimensionless velocity component in X-direction. v Velocity components in Y-direction, m/s. V * Dimensionless velocity component in Y-direction W Heat Source width and height, m. X,Y Dimensionless Coordinates. x,y Dimensional Coordinates. Greek symbols
