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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v17.i4.10
pages 281-296

VISUALIZATION AND CHARACTERIZATION OF A LATERAL SWIRL FLOW STRUCTURE IN SINUSOIDAL CORRUGATED-PLATE CHANNELS

S. Vyas
Gas Turbine Accessories Engineering, GE Energy, Greenville, SC 29615, USA
Raj M. Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA
Milind A. Jog
Thermal-Fluids and Thermal Processing Laboratory, Department of Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA

RESUMO

Curved surfaces interacting with fluid flow tend to produce swirl or secondary circulation, and such mechanisms in wavy-plate-fin channels have been investigated. The fluid recirculation or vortex structure in low Reynolds number flows in plate channels with sinusoidal corrugations is characterized by experimental flow visualization and Laser Doppler Velocimetry (LDV) measurements. The parametric effects of the wavy-plate geometry, described by its waviness aspect ratio γ (= 2 × amplitude/wavelength) and inter-plate spacing ratio ε (= spacing/2 × amplitude), are delineated. Wall-curvature-induced swirl is produced by fluid separation downstream of the wavy-surface peak, its reattachment upstream of the subsequent peak, and the consequent encapsulation of lateral recirculating cells in the channel-wall concavities. The characteristic signature of these trough-region vortices is significantly altered with increasing flow rate, inter-plate spacing ε, and severity of wall waviness γ, when the swirl tends to grow spatially and envelop much of the core-flow region.