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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v2.i1-2.80
pages 71-77

Local Flow Structure for Non-Newtonian Fluids in a Periodically Corrugated Wall Channel

D. Bereiziat
LEMTA - CNRS URA 875 - Université de Nancy I - 2, Av. de la Foret de Haye - B.P. 160 - 54504, Vandoeuvre-les-Nancy Cedex - France
R. Devienne
LEMTA CNRS 875 et Université Henri Poincaré, Vandoeuvre-les-Nancy, France
Michel Lebouche
Laboratoire d'Energetique et de Mecanique Theorique et Appliquee Institut National Polytechnique de Lorraine, Universite Henri Poincare - Nancy I 2, Avenue de la Foret de Haye BP 160, F-54504 Vandoeuvre-les-Nancy Cedex France

ABSTRAKT

Experiments were carried out to characterize the local shear flow inside a periodically corrugated wall channel by use of electrochemical method giving the wall shear rate S and laser-Doppler velocimetry (LDV) for the axial velocity profiles. Both Newtonian fluids and shear-thinning viscous fluids (carboxymethyl-cellulose sodium salt (CMC) additive) are considered, flowing in a range of Reynolds numbers and generalized Reynolds numbers for non-Newtonian fluids determining the following regimes: laminar, transitional and low-Reynolds-number turbulent. Laminar flow, steady motion with a recirculating zone, transition to turbulence with unsteady vortex and three-dimensional instabilities with reducing by the onset of a developed turbulence have been detected.


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