Elementary Study Of Wall Skin Friction Reduction By Microbubbles In Boundary Layer Of Fluid

When large dimension objects such as airplanes and ships move with high speed in less viscosity fluid like air and water, on the solid wall a very thin layer which is called boundary layer will come into being, combines great wall friction resistance. This certainly will cause a great deal of depletion of energy and environmental problems such as air pollution and greenhouse effect, etc. The main objective of this research is to discuss the mechanism of wall friction reduction by microbubbles theoretically, and to establish an integrated mathematics model which is validated by experiment and suitable for actual application. At first, this article introduced the domestic and international theoretic and experimental research actuality of wall friction reduction by microbubbles, and elucidated the definition and layered structure of boundary layer of fluid and the affections of friction reduction made by the structure of the layers respectively; and then discussed the two-phase equations and their items and presented some appropriate complementary equations, and put forward a new bubble-considered mathematical model and concerned theory in two-phase turbulence field, and solved the two-phase equations by difference mesh method; then introduced the experiment with achievements made by the author for this question in detail. Finally, the author made a sum-up of the whole research, and presented the research conclusion.