867 Fluid Flow and Heat Transfer of Opposing Mixed Convection Over Upward-Facing, Inclined Heated Plate

Abstract Experiments on fluid flow and heat transfer in a glass bead packed channel between two parallel grooved plates were conducted. The effects of the grooves on the surface of the heated plate upon the flow resistance and heat transfer were investigated. The results indicated that the grooves on the plate surface change the contact condition of the packed beads to the wall and increase the wall effect of the packed channels. Its direct consequence is to lower the flow resistance. The film heat transfer coefficient on the wall may be increased or rebated. It is demonstrated that a proper combination of packed beads and grooves can lead to the optimum performance of heat transfer for a specific configuration.

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Numerical Investigation of Mixed Convection Heat Transfer in Steady Flow Past a Row of Three Square Cylinders

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.389.164 ◽

2018 ◽

Vol 389 ◽

pp. 164-175

Author(s):

Houssem Laidoudi ◽

Bilal Blissag ◽

Mohamed Bouzit

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Mixed Convection ◽

Convection Heat Transfer ◽

Convection Heat ◽

Thermal Buoyancy ◽

Flow And Heat Transfer ◽

Square Cylinders ◽

Laminar Mixed Convection ◽

Mixed Convection Heat Transfer

In this paper, the numerical simulations of laminar mixed convection heat transfer from row of three isothermal square cylinders placed in side-by-side arrangement are carried out to understand the behavior of fluid flow around those cylinders under gradual effect of thermal buoyancy and its effect on the evacuation of heat energy. The numerical results are presented and discussed for the range of these conditions: Re = 10 to 40, Ri = 0 to 2 at fixed value of Prandtl number of Pr = 1 and at fixed geometrical configuration. In order to analyze the effect of thermal buoyancy on fluid flow and heat transfer characteristics the main results are illustrated in terms of streamline and isotherm contours. The total drag coefficient as well as average Nusselt number of each cylinder are also computed to determine exactly the effect of buoyancy strength on hydrodynamic force and heat transfer evacuation of each cylinder.

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Thermofluid Characteristics on Natural and Mixed Convection Heat Transfer From a Vertical Rotating Hollow Cylinder Immersed in Air: A Numerical Exercise

Journal of Heat Transfer ◽

10.1115/1.4048830 ◽

2020 ◽

Vol 143 (2) ◽

Author(s):

Basanta Kumar Rana ◽

Bhajneet Singh ◽

Jnana Ranjan Senapati

Keyword(s):

Heat Transfer ◽

Reynolds Number ◽

Fluid Flow ◽

Rayleigh Number ◽

Aspect Ratio ◽

Mixed Convection ◽

Hollow Cylinder ◽

Vertical Cylinder ◽

Cylinder Wall ◽

Flow And Heat Transfer

Abstract Numerical investigations are performed on natural and mixed convection around stationary and rotating vertical heated hollow cylinder with negligible wall thickness suspended in the air. The fluid flow and heat transfer characterization around the hollow cylinder are obtained by varying the following parameters, namely, Rayleigh number (Ra), Reynolds number (ReD), and cylindrical aspect ratio (L/D). The heat transfer quantities are estimated by varying the Rayleigh number (Ra) from 104 to 108 and aspect ratio (L/D) ranging from 1 to 20. Steady mixed convection with active rotation of hollow vertical cylinder is further studied by varying the Reynolds number (ReD) from 0 to 2100. The velocity vectors and temperature contours are shown in order to understand the fluid flow and heat transfer around the vertical hollow cylinder for both rotating and nonrotating cases. The surface average Nusselt number trends are presented for various instances of Ra, ReD, and L/D and found out that the higher rate of heat loss from the cylinder wall occurs at high Ra, low L/D (short cylinder) and high ReD.

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