Effect of Aiding and Opposing Buoyancy on the Heat and Fluid Flow Across a Square Cylinder at Re = 100

Sharma, Atul; Eswaran, V.

doi:10.1080/10407780490277798

Cited by 113 publications

(79 citation statements)

References 24 publications

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“…Chang and Sa [6] did a detailed numerical study of the effect of buoyancy on the flow past a hot/cold circular cylinder, at Re = 100 for À1 6 Ri 6 1 and found suppression of vortex shedding at a critical Ri of 0.15. The critical Richardson number found by different researchers for free-stream flow across a circular cylinder have been compared in our earlier study [7]. The suppression of vortex shedding into steady twin vortices, previously observed experimentally for the circular cylinder, was also found [7] for the more bluff square cylinder beyond a certain heating (Ri = 0.15) of the cylinder for Re = 100 and Pr = 0.7.…”

Section: Introductionmentioning

confidence: 87%

“…The critical Richardson number found by different researchers for free-stream flow across a circular cylinder have been compared in our earlier study [7]. The suppression of vortex shedding into steady twin vortices, previously observed experimentally for the circular cylinder, was also found [7] for the more bluff square cylinder beyond a certain heating (Ri = 0.15) of the cylinder for Re = 100 and Pr = 0.7.…”

Section: Introductionmentioning

confidence: 87%

“…The present work is continuation of our previous work [5,7,13]. The objective of this investigation is to study the effect of aiding and opposing buoyancy, as well as the effect of the proximity of the adiabatic bounding (channel) walls on the flow and heat transfer characteristics across a heated/cooled square cylinder for various Reynolds number, Richardson number and blockage ratios.…”

mentioning

confidence: 87%

“…1). It was found [5,7,13] that there is negligible change in the results with further increase in L = 30, H U = 5 and The unsteady, conservative, and dimensionless form of the Navier-Stokes equations [7] in two dimensions for the incompressible flow of a constant viscosity fluid is numerically solved in the present study. In these equations, the velocity is non-dimensionalised with v 1 (which is the constant inlet velocity for the unconfined flow and is the mean-channel inlet velocity for the channel-confined flow case), the spatial coordinates with cylinder width B and the pressure by qu 2 1 .…”

Section: Physical Description Of the Problem Governing Equations Andmentioning

confidence: 99%

“…The Reynolds number, Prandtl number and Richardson number are the governing flow parameter for this problem. The boundary conditions are discussed in our earlier work [5,7].…”

Section: Physical Description Of the Problem Governing Equations Andmentioning

confidence: 99%

See 4 more Smart Citations

Effect of channel-confinement and aiding/opposing buoyancy on the two-dimensional laminar flow and heat transfer across a square cylinder

Sharma

Eswaran

2005

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 87%

mentioning

confidence: 87%

Section: Physical Description Of the Problem Governing Equations Andmentioning

confidence: 99%

“…The Reynolds number, Prandtl number and Richardson number are the governing flow parameter for this problem. The boundary conditions are discussed in our earlier work [5,7].…”

Section: Physical Description Of the Problem Governing Equations Andmentioning

confidence: 99%

See 3 more Smart Citations

Effect of channel-confinement and aiding/opposing buoyancy on the two-dimensional laminar flow and heat transfer across a square cylinder

Sharma

Eswaran

2005

International Journal of Heat and Mass Transfer

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Numerical simulation of the flow around a porous covering square cylinder in a channel via lattice Boltzmann method

Rong

Guo

Jin

et al. 2011

Numerical Methods in Fluids

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SUMMARYIn this paper, a detailed investigation on the flow past a porous covering cylinder is presented through the lattice Boltzmann method. The Brinkman-Forchheimer-extended Darcy model is adopted for the entire flow field with the solid, fluid, and porous medium. The effects of several parameters, such as porous layer thickness, Darcy number, porosity, and Reynolds number on flow field are discussed. Compared with the case of a solid cylinder, the present work shows that the porous layer may play an important role on the flow, the lift and drag force exerted on the cylinder. The numerical results indicate that the maximal drag coefficient C d and maximal amplitude of lift coefficient C l exist at certain Darcy number which is in the range of 10 −6 -10 −2 .

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Effects of wall confinement and rheology of non‐Newtonian nanofluids on mixed convection phenomenon of a square cylinder in a vertical channel

Krishna

Gidituri

Kishore

2017

Heat Trans. Asian Res.

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The mixed convective momentum and heat transfer phenomena of confined square cylinders in non‐Newtonian nanofluids are numerically investigated. The experimental thermophysical properties of alumina‐water‐based nanofluids are adopted from literature and these nanofluids obey shear‐thinning power‐law type non‐Newtonian behavior. The square cylinder is confined in a vertical channel with a confinement ratio of 0.1333. The flow is assumed to be two‐dimensional and the fluid is allowed to flow in upward direction across the confined square cylinder in the vertical channel. The aiding/opposing buoyancy in the flow is incorporated in terms of Richardson number (Ri) in the range of –2 to 2. The ranges of other dimensionless parameters considered are: Reynolds number, Re: 1 to 40; and volume fraction of nanoparticles, ϕ: 0.005 to 0.045. This range of volume fraction of nanoparticles (i.e., ϕ = 0.005 to 0.045) corresponds to the power‐law index (n) of a non‐Newtonian nanofluid in the range of n = 0.88 to 0.5, respectively. Prior to obtaining new results, the solution methodology is validated with existing literature counterparts. Finally, effects of the Reynolds number, Richardson number, and the rheology of non‐Newtonian nanofluids on streamline patterns, surface pressure, surface vorticity, drag coefficients, isotherm contours, local and average Nusselt numbers are delineated.

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Effect of Aiding and Opposing Buoyancy on the Heat and Fluid Flow Across a Square Cylinder at Re = 100

Cited by 113 publications

References 24 publications

Effect of channel-confinement and aiding/opposing buoyancy on the two-dimensional laminar flow and heat transfer across a square cylinder

Effect of channel-confinement and aiding/opposing buoyancy on the two-dimensional laminar flow and heat transfer across a square cylinder

Numerical simulation of the flow around a porous covering square cylinder in a channel via lattice Boltzmann method

Effects of wall confinement and rheology of non‐Newtonian nanofluids on mixed convection phenomenon of a square cylinder in a vertical channel

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