000004624 001__ 4624
000004624 005__ 20141119144539.0
000004624 04107 $$aeng
000004624 046__ $$k2002-06-02
000004624 100__ $$aNg, Chiu-On
000004624 24500 $$aA CLOSED-FORM TIME-VARYING DIFFUSIVITY MODEL FOR DISPERSION IN OSCILLATORY TURBULENT CHANNEL FLOW

000004624 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004624 260__ $$bColumbia University in the City of New York
000004624 506__ $$arestricted
000004624 520__ $$2eng$$aAn 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. 

000004624 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004624 653__ $$aturbulent oscillatory flow, time-varying eddy diffusivity, shear dispersion, homogenization method.

000004624 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004624 720__ $$aNg, Chiu-On$$iLei, Zhendong
000004624 8560_ $$ffischerc@itam.cas.cz
000004624 8564_ $$s199492$$uhttps://invenio.itam.cas.cz/record/4624/files/078.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004624 962__ $$r4594
000004624 980__ $$aPAPER