Low Reynolds number flow through models of dissolved polymer skeins.
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Low Reynolds number flow through models of dissolved polymer skeins.

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Published .
Written in English


Book details:

The Physical Object
Pagination39 leaves
Number of Pages39
ID Numbers
Open LibraryOL21859546M

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Hydromechanics of low-Reynolds-number pow. Part 2 The above solution (7) can also be derived directly from (1) with f = f, (see part 1). Physically, a rotlet flow may be regarded as that due to a singular point torque at the origin, since the moment exerted on the fluid by a rotlet of strength. Practical approaches to subjects like fluidization, sedimentation, and flow through porous media abound in much useful but uncorrelated empirical information. The present book represents an attempt to bridge this gap by providing at least the beginnings of a rational approach to fluid particle dynamics, based on 5/5(3). Experimental study of low Reynolds number nozzles High-performance electrothermal thrusters operate in a low nozzle-throat Reynolds number regime. Under these conditions, the flow boundary layer occupies a large volume inside the nozzle, contributing to large viscous losses. Four nozzles (conical, bell, trumpet, and modified trumpet) and a File Size: KB. A low-Reynolds-number k-ω model for Newtonian fluids has been developed to predict drag reduction of viscoelastic fluids described by the FENE-P model. The model is an extension to viscoelastic fluids of the model for Newtonian fluids developed by Bredberg et al. (Int J Heat Fluid Flow –, ). The performance of the model was assessed using results from direct numerical.

A mathematical model for fluid flow through gel filled due to small amounts of polymer dissolved in water is experimentally studied. for the low Reynolds number flow through an. Two commonly used turbulence models for predicting wall-bounded flows are: (1) the high Reynolds number k-epsilon model with wall functions and (2) the low Reynolds number k-epsilon model with near-wall resolution, often claimed to be more accurate than wall functions. The present study is aimed at the systematic assessment of the two approaches by considering a number of two-dimensional flows. Turbulent model is a powerful tool to solve engineering problems because of its fast computational ability. However, its precision is usually low. To solve this problem, we introduce DNS to provide accurate data to construct a high-precision turbulent model. A Reynolds stress model for viscoelastic polymer drag-reducing flow is established.   It is worth mentioning that those results were obtained for relatively low Reynolds number flows. The typical Reynolds numbers, based on the stream-wise length and the free-stream velocity, for the PIV measurement and the ship model was near 2 million. The exception is the flat plate towing tank test, for which Reynolds number reached to 6 million.

Reynolds number is a dimensionless value which is applied in fluid mechanics to represent whether the fluid flow in a duct or pat a body is steady or turbulent. Calculate the Reynolds number if a liquid of viscosity Ns/m2 and relative density of Kg/m3 through a 10 mm pipe flows with a Velocity of 3 m/s. R e = x / TURBULENT PIPE FLOW WITH POLYMER ADDITIVES where η s is the solvent (water) viscosity and e ij the rate-of-deformation tensor. The well-known Reynolds decomposition is used for the velocity vector u i = (u x,u r,u θ), the pressure p and the polymeric stress τ p,ij, in which lower case with a prime denotes a fluctuation and upper case denotes a mean value (alterna-. Simulating drag reduction phenomenon in turbulent pipe flow using polymeric additives Turbulent pipe flow predictions with a low Reynolds number k–e model for drag reducing fluids Jan Equations are given that relate the entrance length to Reynolds number for pipe and channel geometries with a flat velocity profile as the initial condition. These equations are linear combinations of the creeping flow and boundary layer solutions. The former is obtained by minimization of the viscous dissipation using the finite element method.