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81.
《ournal of non Newtonian Fluid Mechanics》2005,125(1):61-70
This paper concerns the asymmetry in mean axial velocity distributions for the flow through an axisymmetric sudden expansion of a viscoelastic, shear-thinning aqueous solution of a polyacrylamide (PAA). The asymmetry manifests itself as an azimuthal variation in the length of the recirculation region of the separated flow downstream of the expansion inlet. For water, the flow is found to be axisymmetric. The asymmetry for the PAA flow, which remained unchanged despite alterations to the flow facility, is attributed to the high viscoelasticity of the polymer solution. The conclusion is drawn that the asymmetry is a purely physical feature of such a flow, and not the product of upstream or downstream flow conditions deriving from the flow facility, or the result of geometrical imperfections in the axisymmetric sudden expansion set-up. 相似文献
82.
83.
《Chaos, solitons, and fractals》2005,23(3):989-995
We prove that a continuous flow with the average-shadowing property is chain transitive and a Lyapunov stable continuous flow with the average-shadowing property is a minimal flow. 相似文献
84.
The problem of heat transfer in the wall region of a turbulent boundary layer has been investigated. The resonant triad in
the theory of hydrodynamic stability was used to obtain the velocity field induced by the coherent structures in the wall
region of the turbulent boundary layer, while the small scale turbulence was represented by a simple model. By such a new
approach of modeling, the 3-D temperature field is calculated, the mean temperature profile in the wall region and the Nusselt
number characterizing the heat flux, which was found to be in good agreement with the experimental observations are obtained.
The instantaneous temperature field had streaky structures, thus offering a mechanism for their generation found in numerical
simulations.
Project supported by the National Natural Science Foundation of China (Grant No. 19132011). 相似文献
85.
Using an extended homogeneous balance approach and a linear variable separation method, a general variable separation excitation of the (2 + 1)-dimensional variable coefficient Broer–Kaup (VCBK) system is derived. Based on the derived solution, we reveal soliton fission and fusion phenomena in the (2 + 1)-dimensional soliton system. 相似文献
86.
87.
88.
By using the bifurcation theory of planar dynamical systems to a generalized Camassa–Holm equation
mt+c0ux+umx+2mux=-γuxxx