Journal ArticleDOI
Flow of inelastic and viscoelastic fluids past a sphere
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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.Abstract:
This is essentially an engineering study undertaken with a view to providing drag coefficient correlations for the motion of a solid sphere in inelastic and viscoelastic fluids over a wide range of Reynolds numbers. An approximate closed form analytical solution has been obtained for the motion of a solid sphere in powerlaw fluids and this solution has been verified experimentally. The high Reynolds number flow was analysed theoretically using boundary layer theory; the results were used to separate form and skin friction. Viscoelastic fluids showed “drag reduction” at high Reynolds number. About 300 experimental data points were used to obtain drag coefficient correlations over a wide range of material and flow parameters.read more
Citations
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Journal ArticleDOI
Breakdown of the Continuum Stokes−Einstein Relation for Nanoparticle Diffusion
TL;DR: This is one of the first demonstrations of X-ray photo correlation spectroscopy applied to polymeric liquids, which is used to explain the simultaneous 60% viscosity reduction of the mixture through a proposed constraint release mechanism.
Book ChapterDOI
Non-Newtonian Fluids in Circular Pipe Flow
Young I. Cho,James P. Harnett +1 more
TL;DR: In this paper, the heat transfer behavior of viscoelastic fluid in turbulent pipe flow is investigated analytically, and the usual and simplest method is to solve the uncoupled energy equation using the empirically determined velocity profile.
Journal ArticleDOI
An experimental investigation of negative wakes behind spheres settling in a shear-thinning viscoelastic fluid
Mark Arigo,Gareth H. McKinley +1 more
TL;DR: In this article, negative wake structures are investigated using laser-Doppler velocimetry (LDV) to examine the centerline fluid velocity around the sphere and DVS for full-field velocity profiles.
Journal ArticleDOI
Velocity fields around spheres and bubbles investigated by laser-doppler anemometry
TL;DR: In this paper, an experimental investigation is presented in which the velocity fields around sheres and bubbles moving in a cylinder have been measured by laser-Doppler anemometry (LDA), and it is shown that the wall correction factor K is a rapidly decreasing function of the Deborah number.
Journal ArticleDOI
The drag on a sphere in a power-law fluid
Gu Dazhi,Roger I. Tanner +1 more
TL;DR: In this paper, the authors used finite-element programs to estimate the drag on an unbounded fluid in an (inelastic) power-law fluid and showed that wall effects are negligible forn ⩽ 0.5.
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
Behaviour of macroscopic rigid spheres in Poiseuille flow Part 1. Determination of local concentration by statistical analysis of particle passages through crossed light beams
G. Segré,A. Silberberg +1 more
TL;DR: In this paper, an apparatus is described for determining particle passages through any selected point on a tube cross-section, based on the simultaneous blocking out of two mutually perpendicular light beams by a particle passing through their common region.
Journal ArticleDOI
Particle motion in laminar vertical tube flow
R. C. Jeffrey,J. R. A. Pearson +1 more
TL;DR: In this article, the motion of small rigid spherical particles suspended in a Newtonian viscous liquid flowing under steady laminar conditions in a vertical tube of circular cross-section was studied.
Journal ArticleDOI
The slow flow of a visco-elastic liquid past a sphere
Frank M. Leslie,R. I. Tanner +1 more
Journal ArticleDOI
Flow of a particular class of non-Newtonian visco-elastic and visco-inelastic fluids near a stagnation point
TL;DR: In this paper, the Effekt der Querviskositat and Viskoelastizitat durch den dimensionslosen Parameter R=ψa/α beziehungsweiseK=βa/β/α dargestellt werden.