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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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Local Flow Structure for Non-Newtonian Fluids in a Periodically Corrugated Wall Channel
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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