Journal ArticleDOI
Steady non-Newtonian flow past a circular cylinder: a numerical study
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In this paper, the steady and incompressible flow of non-Newtonian fluids past a circular cylinder is investigated for power law indices n between 0.2 and 1.4, blockage ratios of 0.037, 0.082 and 0.164, and the Reynolds numbers Re of 1, 20 and 40, using a stream function/vorticity formulation.Abstract:
The steady and incompressible flow of non-Newtonian fluids past a circular cylinder is investigated for power law indices n between 0.2 and 1.4, blockage ratios of 0.037, 0.082 and 0.164, and the Reynolds numbers Re of 1, 20 and 40, using a stream function/vorticity formulation. The governing field equations have been solved by using a second-order accurate finite difference method to determine the drag coefficient, wake length, separation angle and flow patterns, and to investigate their dependence on power law index, blockage ratio and Reynolds number. The results reported here provide fundamental knowledge on the dependence of engineering flow parameters on blockage ratio and power law index, and further show that the effects on stream line and iso-vorticity patterns which result from an increase in the blockage ratio are similar to those which result from a decrease in the power law index.read more
Citations
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Flow and Forced Convection Heat Transfer in Crossflow of Non-Newtonian Fluids over a Circular Cylinder
TL;DR: The steady and incompressible flow of power-law type non-Newtonian fluids across an unconfined, heated circular cylinder is investigated numerically to determine the dependence of the individual drag components and of the heat transfer characteristics on power law index (0.5 ≤ n ≤ 1.4), Prandtl number (1 ≤ Pr ≤ 100), and Reynolds number (5 ≤ Re ≤ 40) as mentioned in this paper.
Journal ArticleDOI
Steady forced convection heat transfer from a heated circular cylinder to power-law fluids
TL;DR: Forced convection heat transfer to incompressible power-law fluids from a heated circular cylinder in the steady cross-flow regime has been investigated numerically by solving the momentum and thermal energy equations using a finite volume method and the QUICK scheme on a non-uniform Cartesian grid as mentioned in this paper.
Journal ArticleDOI
Steady Flow of Power Law Fluids across a Circular Cylinder
TL;DR: In this article, the momentum equations describing the steady cross-flow of power law fluids past an unconfined circular cylinder have been solved numerically using a semi-implicit finite volume method.
Journal ArticleDOI
Effect of power-law index on critical parameters for power-law flow across an unconfined circular cylinder
TL;DR: In this paper, the conditions for the formation of a wake and for the onset of wake instability for the flow of power-law fluids over an unconfined circular cylinder are investigated numerically by solving the continuity and momentum equations using FLUENT (version 6.2).
Journal ArticleDOI
Forced convection heat transfer from an elliptical cylinder to power-law fluids
TL;DR: In this paper, the effects of the power-law index (0.2 ǫ nǫ 1.8), Reynolds and Prandtl numbers and the aspect ratio of the elliptic cylinder on the average Nusselt number were studied.
References
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TL;DR: In this paper, the authors evaluated the applicability of the standard κ-ϵ equations and other turbulence models with respect to their applicability in swirling, recirculating flows.
Journal ArticleDOI
Experiments on the flow past a circular cylinder at low Reynolds numbers
TL;DR: In this article, the authors describe measurements of the drag on circular cylinders, made by observing the bending of quartz fibres, in a stream with the Reynolds number range 0·5-100.
Journal ArticleDOI
Numerical solutions for steady flow past a circular cylinder at Reynolds numbers up to 100
S. C. R. Dennis,Gau-Zu Chang +1 more
TL;DR: In this article, a finite-difference solution of the equations of motion for steady incompressible flow around a circular cylinder has been obtained for a range of Reynolds numbers from R = 5 to R = 100, where the wake length increases linearly with R over the whole range from the value, just below R = 7, at which it first appears.
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TL;DR: In this paper, the authors present a detailed discussion of non-Newtonian fluid behavior in the context of Viscoelastic Fluid Dynamics, including the role of velocity-volume behavior in free rise or fall.
Journal ArticleDOI
A numerical study of steady viscous flow past a circular cylinder
TL;DR: In this paper, a new technique is proposed for the boundary condition at large distances and an iteration scheme has been developed, based on Newton's method, which circumvents the numerical difficulties previously encountered around and beyond a Reynolds number of 100.