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ISSN オンライン: 2642-0554

SLIP VELOCITY OF RIGID FIBERS IN A TURBULENT CHANNEL FLOW

Lihao Zhao
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Cristian Marchioli
Centro Interdipartimentale di Fluidodinamics e Idraulica, Dipartimento di Energetica e Macchine, Universita degli Studi di Udine, Via delle Scienze 208, 33100 Udine, Italy

Helge I. Andersson
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

要約

In the current study the slip velocity between rigid fibers and a viscous fluid is investigated in a turbulent channel flow. The statistical moments of the slip velocity are evaluated considering prolate ellipsoidal fibers with Stokes number, St, ranging from 1 to 100 and aspect ratio, λ, ranging from 3 to 50. Statistics are compared one-to-one with those obtained for spherical particles (λ = 1) to highlight effects due to fiber elongation. The statistical results show that the effect of Stokes number is found to be important and there is a monotonic dependence that the magnitude of slip velocity becomes larger with increasing Stokes number. However, the influence of aspect ratio is relatively weaker than the Stokes number effect. And the non-monotonic aspect ratio dependence is observed in both streamwise and wall-normal slip velocity. The smallest fiber deposition is found at aspect ratio λ = 50 with minimum value of slip velocity in wall-normal direction.