Journal ArticleDOI
Rotational viscoelastic laminar boundary layer flow around a rotating disc
TLDR
In this article, the equations of motion for the laminar boundary layer flow over a rotating disc have been derived for a fluid which obeys a Rivlin-Ericksen type of constitutive equation and whose material parameters are assumed to be arbitrary functions of the second invariant of the rate of deformation tensor.Abstract:
The equations of motion for the laminar boundary layer flow over a rotating disc have been derived for a fluid which obeys aRivlin-Ericksen type of constitutive equation and whose material parameters are assumed to be arbitrary functions of the second invariant of the rate of deformation tensor. The analysis establishes the conditions under which a true similarity solution is possible. An inspectional analysis yields a relationship between the moment coefficient, a generalizedReynolds number and a modifiedWeissenberg number which incorporates a variable relaxation time with a process time characteristic of the boundary layer flow on the disc. Experimental data obtained are analysed in terms of the derived relationship and the agreement between the two, after the determination of the unknown constants, is found to be quite sound. A brief discussion follows which emphasizes the role of geometry, regime of flow and viscoelastic material parameters in giving a wide variety of flow phenomena.read more
Citations
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Journal ArticleDOI
Flow of inelastic and viscoelastic fluids past a sphere
TL;DR: In this article, an approximate closed form analytical solution has been obtained for the motion of a solid sphere in powerlaw fluids and this solution was verified experimentally using boundary layer theory; the results were used to separate form and skin friction.
Book ChapterDOI
Thermal Convection in Non-Newtonian Fluids*
Aroon Shenoy,R. A. Mashelkar +1 more
TL;DR: In this article, an approximate correlating equation for mixed convection in external flows on non-Newtonian fluids is presented and the theoretical indications to show that there are likely to be tremendous advantages in adding drag-reducing polymers to impart viscoelastic properties to materials undergoing the process of thermal convection under turbulent conditions.
Journal ArticleDOI
Mechanics of bubble motion and deformation in non-newtonian media
TL;DR: In this paper, the authors provide quantitative information on the drag coefficients for isolated gas bubbles moving in the low and high Reynolds number region and bubble shapes and velocity transition and discontinuity in non-Newtonian media.
Journal ArticleDOI
The effect of rheological complexities on power consumption in an aerated, agitated vessel
TL;DR: In this article, power for agitation was measured under aerated and unaerated conditions in a 0.29 m vessel of Rushton dimensions at specific powers up to 18 W/kg.
Journal ArticleDOI
Analysis of von Kármán’s swirling flow on a rotating disc in Bingham fluids
Abhijit Guha,Sayantan Sengupta +1 more
TL;DR: In this article, a semi-analytical approach was proposed to predict the non-dimensional moment coefficient of a Bingham fluid above a rotating disc, which was first studied by von Karman for a Newtonian fluid.
References
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Book
Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI
The flow due to a rotating disc
TL;DR: In this paper, the steady motion of an incompressible viscous fluid due to an infinite rotating plane lamina was considered, and it was shown that the equations of motion and continuity are satisfied by taking
Journal ArticleDOI
Elastico-viscous boundary-layer flows I. Two-dimensional flow near a stagnation point
D. W. Beard,K. Walters +1 more
TL;DR: In this article, the authors extended the boundary-layer theory for an idealized elastico-viscous liquid and showed that the main effect of elasticity is to increase the velocity in the boundary layer and increase the stress on the solid boundary.
Journal ArticleDOI
Momentum and heat transfer in laminar boundary-layer flows of non-Newtonian fluids past external surfaces
TL;DR: In this article, a theoretical analysis for the laminar flow past arbitrary external surfaces of non-Newtonian fluids of the power-law model is presented, where the main problem which is considered is how to predict the drag and the rate of heat transfer from an isothermal surface to the fluid.
Journal ArticleDOI
The application of boundary-layer theory to power-law pseudoplastic fluids: Similar solutions
TL;DR: In this paper, the types of potential flows necessary for similar solutions to the boundary-layer equations have been determined for two-dimensional and three-dimensional non-Newtonian fluids.