Geometric optimization of riblet-textured surfaces for drag reduction in laminar boundary layer flows

2019 ◽  
Vol 31 (5) ◽  
pp. 053601 ◽  
Author(s):  
Shabnam Raayai-Ardakani ◽  
Gareth H. McKinley
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Laminar Boundary Layer ◽  
Geometric Optimization ◽  
Textured Surfaces ◽  
Boundary Layer Flows

Laminar Boundary Layer Flows with Surface Reactions

1957 ◽  
Vol 49 (6) ◽  
pp. 1025-1029 ◽  
Author(s):  
Andreas Acrivos ◽  
Paul L. Chambre
Keyword(s):  
Boundary Layer ◽  
Laminar Boundary Layer ◽  
Surface Reactions ◽  
Boundary Layer Flows

scholarly journals Compressible laminar boundary-layer flows of a dusty gas over a semi-infinite flat plate

1988 ◽  
Vol 186 ◽  
pp. 223-241 ◽  
Author(s):  
B. Y. Wang ◽  
I. I. Glass
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Laminar Boundary Layer ◽  
Leading Edge ◽  
Expansion Method ◽  
Boundary Layer Flows ◽  
Two Phase ◽  
Displacement Thickness ◽  
Slip Region ◽  
Two Phases

The compressible laminar boundary-layer flows of a dilute gas-particle mixture over a semi-infinite flat plate are investigated analytically. The governing equations are presented in a general form where more reasonable relations for the two-phase interaction and the gas viscosity are included. The detailed flow structures of the gas and particle phases are given in three distinct regions: the large-slip region near the leading edge, the moderate-slip region and the small-slip region far downstream. The asymptotic solutions for the two limiting regions are obtained by using a series-expansion method. The finite-difference solutions along the whole length of the plate are obtained by using implicit four-point and six-point schemes. The results from these two methods are compared and very good agreement is achieved. The characteristic quantities of the boundary layer are calculated and the effects on the flow produced by the particles are discussed. It is found that in the case of laminar boundary-layer flows, the skin friction and wall heat-transfer are higher and the displacement thickness is lower than in the pure-gas case alone. The results indicate that the Stokes-interaction relation is reasonable qualitatively but not correct quantitatively and a relevant non-Stokes relation of the interaction between the two phases should be specified when the particle Reynolds number is higher than unity.

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