A CLOSED-FORM TIME-VARYING DIFFUSIVITY MODEL FOR DISPERSION IN OSCILLATORY TURBULENT CHANNEL FLOW
Abstract eng: An analytical development is presented for the shear dispersion in a turbulent channel flow forced by a purely oscillatory pressure gradient. The flow is described by an algebraic eddy viscosity model, in which the instantaneous flow and viscosity are made interdependent. Both eddy viscosity and eddy diffusivity contain a second-harmonic time-varying component. The effective transport equation is derived using a two-time scale perturbation analysis, which also yields a closed-form expression for the dispersion coefficient. Numerical results demonstrate that for this problem the time-varying component of the eddy diffusivity is to have a finite effect on the dispersion coefficient.
Contributors:
Publisher:
Columbia University in the City of New York
Conference Title:
Conference Title:
15th ASCE Engineering Mechanics Division Conference
Conference Venue:
New York (US)
Conference Dates:
2002-06-02 / 2002-06-05
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2014-11-19, last modified 2014-11-19
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