Non-isothermal flow of a polymeric liquid passing an asymmetrically confined cylinder

Lin, Yi-Hsin; Wu, Gien-Huang; Ju, Shen-Haw

doi:10.1016/s0017-9310(03)00349-1

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…Recently, Wu et al (2003) numerically investigated the effects of fl uid elasticity, inertia and shearthinning on the drag and heat transfer in non-isothermal fl ow of polymeric liquids, modelled by Upper Convective Maxwell (UCM) model past an unconfi ned circular cylinder for the range of parameters as 0.5 ≤ Re ≤ 8, 0.063 ≤ We ≤ 1 and Pr=500, 1000 and 2000. The fl ow of non-isothermal polymeric liquids, LDPE modelled by Bird-Carreau model, past an asymmetrical confi ned cylinder has also been numerically investigated by Lin et al (2004) who reported the effect of shear-thinning and temperature-thinning (i.e., viscous heating) on the drag, lift and Nusselt number for the eccentricity factor of 0, 0.33, 0.5 and 0.66, Re ≤ 1.52 x 10 -4 and Pr ≤ 4.6 x 10 4 . Aside from these results based on the solution of the complete governing equations, there have been some studies based on the boundary layer fl ow approximations (Khan et al, 2005;.…”

Section: Steady Flow Of Power Law Fluids Across a Circular Cylindermentioning

confidence: 99%

Steady Flow of Power Law Fluids across a Circular Cylinder

2006

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gammes de conditions, soit 5 ≤ Re ≤ 40 et 0,6 ≤ n ≤ 2. Le comportement rhéofl uidifi ant (n < 1) du fl uide réduit la taille de la zone de recirculation et accroît également la séparation; d'autre part, les fl uides rhéoépaississants (n > 1) montrent un comportement opposé. En outre, alors que la taille du sillage varie de manière non monotone avec l'indice de loi de puissance, elle ne semble pas infl uencer les valeurs du coeffi cient de traînée. Le coeffi cient de pression de stagnation et le coeffi cient de traînée montrent aussi une dépendance complexe envers l'indice de loi de puissance et le nombre de Reynolds. Les distributions des coeffi cients de pression, de la vorticité et de la viscosité sur la surface du cylindre sont également présentées afi n de mieux comprendre les cinématiques d'écoulement détaillées.

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Section: Steady Flow Of Power Law Fluids Across a Circular Cylindermentioning

confidence: 99%

Steady Flow of Power Law Fluids across a Circular Cylinder

2006

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“…Flow pattern and its characteristics around immersed bluff bodies have been studied by many researches because of the complexities and practical importance of these flows, the principle issues of classical flow configuration are wake formation, flow separation, the external forces acting on the body (drag and lift), and especially the heat transfer rate changing among the fluid-flow and the immersed body. The results show that the flow over a cylinder depends on large number of parameters and geometrical shapes such as type of fluid-flow (compressible or incompressible, Newtonian or Non Newtonian) [1][2][3][4], confined or unconfined cylinder [5,6], and symmetrically or asymmetrically confined cylinder [7][8][9]. Forced convection and fluid-flows over circular cylinder arise in many micro-channels, nuclear.…”

Section: Introductionmentioning

confidence: 97%

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Laidoudi

Bouzit

2018

THERM SCI

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This paper examines the effects of thermal buoyancy on momentum and heat transfer characteristics of symmetrically and asymmetrically confined cylinder submerged in incompressible Poiseuille liquid. The detailed flow and temperature fields are visualized in term of streamlines and isotherm contours. The numerical results have been presented and discussed for the range of conditions as 10 ≤ Re ≤ ≤ 40, Richardson number 0 ≤ Ri ≤ 4, and eccentricity factor 0 ≤ ε ≤ 0.7 at Prandtl number Pr = 1, and blockage ratio B = 20%. The representative streamlines and isotherm patterns are presented to interpret the flow and thermal transport visualization. When the buoyancy is added, it is observed that the flow separation diminishes gradually and at some critical value of the thermal buoyancy parameter it completely disappears resulting a creeping flow. Additionally, it is observed that the down vortex requires more heating in comparison to upper vortex in order to be suppressed. In the range 1.5 ≤ Ri ≤ 4, two counter rotating regions appear above the cylinder and on the down channel wall behind the cylinder. The total drag coefficient, C D , increases with increasing Richardson number at (ε = 0). Moreover, an increase in eccentricity factor from 0 to 0.3 increases C D by 37% at Re = 10, and 30% at Re = 20 for Ri = 4. An increase in eccentricity factor form 0 to 0.4 increases local Nusselt number by 20.4% at Re = 10, and 18.6% at Re = 30 for Ri = 4.

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Thermodynamically Consistent Limiting Forced Convection Heat Transfer in a Asymmetrically Heated Porous Channel: An Analytical Study

Mondal

2013

Transp Porous Med

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Fluid transport and the associated heat transfer through porous media is of immense importance because of its numerous practical applications. In view of the widespread applications of porous media flow, the present study attempts to investigate the forced convective heat transfer in the limiting condition for the flow through porous channel. There could be many areas, where heat transfer through porous channel attain some limiting conditions, thus, the analysis of limiting convective heat transfer is far reaching. The primary aim of the present study is focused on the limiting forced convection analysis considering the flow of Newtonian fluid between two asymmetrically heated parallel plates filled with saturated porous media. Utilizing a few assumptions, which are usually employed in the literature, an analytical methodology is executed to obtain the closed-form expression of the temperature profile, and in the following the expression of the limiting Nusselt numbers. The parametric variations of the temperature profile and the Nusselt numbers in different cases have been shown highlighting the influential role of different performance indexing parameters, like Darcy number, porosity of the media, and Brinkman number of forced convective heat transfer in porous channel. In doing so, the underlying physics of the transport characteristics of heat has been delineated in a comprehensive way. Moreover, a discussion has been made regarding an important feature like the onset of point of singularity as appeared on the variation of the Nusselt number from the consideration of energy balance in the flow field, and in view of second law of thermodynamics.

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Non-isothermal flow of a polymeric liquid passing an asymmetrically confined cylinder

Cited by 7 publications

References 7 publications

Steady Flow of Power Law Fluids across a Circular Cylinder

Steady Flow of Power Law Fluids across a Circular Cylinder

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Thermodynamically Consistent Limiting Forced Convection Heat Transfer in a Asymmetrically Heated Porous Channel: An Analytical Study

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