The Effects of Reynolds and Prandtl Numbers on Flow and Heat Transfer Across Tandem Square Cylinders in the Steady Flow Regime

2011 ◽  
Vol 59 (6) ◽  
pp. 421-437 ◽  
Author(s):  
Dipankar Chatterjee ◽  
Gautam Biswas
Keyword(s):  
Heat Transfer ◽  
Steady Flow ◽  
Flow Regime ◽  
Flow And Heat Transfer ◽  
Square Cylinders ◽  
Tandem Square Cylinders ◽  
Prandtl Numbers

Effects of Reynolds and Prandtl Numbers on Heat Transfer Around a Circular Cylinder by the Simplified Thermal Lattice Boltzmann Model

2015 ◽  
Vol 17 (4) ◽  
pp. 937-959 ◽  
Author(s):  
Qing Chen ◽  
Xiaobing Zhang ◽  
Junfeng Zhang
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Flow Regime ◽  
Lattice Boltzmann Model ◽  
Temperature Fields ◽  
Nusselt Numbers ◽  
Flow And Heat Transfer ◽  
Prandtl Numbers ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model

AbstractIn this paper, the fluid flow and heat transfer around a circular cylinder are studied under various conditions (Reynolds number 10 <Re< 200; Prandtl number, 0.1 ≤Pr≤ 2). To solve the governing equations, we use the simplified thermal lattice Boltzmann model based on double-distribution function approach, and present a corresponding boundary treatment for both velocity and temperature fields. Extensive numerical results have been obtained to the flow and heat transfer behaviors. The vortices and temperature evolution processes indicate that the flow and temperature fields change synchronously, and the vortex shedding plays a determinant role in the heat transfer. Furthermore, the effects of Reynolds and Prandtl number on the flow and isothermal patterns and local and averaged Nusselt numbers are discussed in detail. Our simulations show that the local and averaged Nusselt numbers increase with the Reynolds and Prandtl numbers, irrespective of the flow regime. However, the minimum value of the local Nusselt number can shift from the rear point at the back of the cylinder with higher Prandtl number even in the steady flow regime, and the distribution of the local Nusselt number is almost monotonous from front stagnation point to rear stagnation point with lower Prandtl number in the unsteady flow regime.

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

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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