The Effects of Porous Material on Microbubble Skin Friction Reduction.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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Previous results have shown that the injection of a high concentration of microbubbles into a turbulent boundary layer can produce sizeable skin friction reductions. The present paper investigates the role of the porous material in this phenomenon. A variety of different porous surfaces have been tested a series of sintered metal plates with widely different pore sizes a specially constructed porous material, composed of plastic strips and two different porous section lengths. The effects of gravity were determined by changing the orientation of the porous surface with respect to the boundary layer. A notable conclusion is that the skin friction reduction is not critically related to the characteristics of the porous material.
- Fluid Mechanics