Download or read book Bubble Drag Reduction in a Flat Plate Boundary Layer at High Reynolds Numbers and Large Scales written by Wendy Carol Sanders and published by . This book was released on 2004 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Viscous Drag Reduction in Boundary Layers written by and published by AIAA. This book was released on 1990 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Reynolds Number Flat Plate Turbulent Boundary Layer Measurements and Skin Friction Drag Reduction with Gas Or Polymer Injection written by Eric S. Winkel and published by . This book was released on 2006 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mitigation Of Hydrodynamic Resistance Methods To Reduce Hydrodynamic Drag written by Marc Perlin and published by World Scientific. This book was released on 2014-11-18 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text presents the state of the art in friction drag/resistance reduction technologies for BODIES and crafts operating in liquids at and beneath the free surface. It is useful for professionals with backgrounds in advanced fluid dynamics as well as by academics teaching introductory graduate courses in this area. Active control of resistance will include a discussion of friction reduction, for example through the injection of gas that can form air layers and polymers that initially reside adjacent to the hull, including the use of partial and super cavities. The book discusses passive resistance control achieved through changes in the overall hull shape and appendages, including the application of lifting bodies, bulbous bows, and stern flaps. It also addresses passive reduction of skin friction through the application of hull coatings and other elements of hull husbandry.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulence Control by Passive Means written by E. Coustols and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 4th European Drag Reduction Meeting

Download or read book Drag Reduction Using Trapped Bubbles on a Submerged Flat Plate Surface written by Kelly Ann Stephani and published by . This book was released on 2006 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag reduction using an array of thousands of tiny trapped bubbles on a submerged flat plate was investigated. The objective was to determine if viscous drag reduction could be obtained by replacing portions of the solid no-slip surface of the plate with areas of near-slip formed by the bubbles. Drag measurements were obtained for two different trapped bubble configurations. The first configuration involved a large bubble trapped on the bottom surface of a horizontally mounted plate, which provides insight as to the maximum drag reduction obtainable using the trapped bubble concept. The second configuration involved a trapped bubble array (TBA), which uses electrolysis to grow and maintain bubbles on the plate surface in thousands of tiny conductive holes. The TBA experiments are conducted on a vertically mounted plate, which demonstrates the versatility of this drag reduction method. Drag measurements over a range of Reynolds numbers were made on different plate configurations using three independent measurement techniques; the reliability of these results are demonstrated by agreement among the measured drag values as well as good agreement with an analytic turbulent flat plate solution. The large trapped bubble configuration showed an increase in drag reduction with increasing Reynolds number and demonstrated a maximum drag reduction of 32% corresponding to a slip bubble region covering 35% of the wetted plate surface. The trapped bubble array results were inconclusive. Total drag measurements on the plate agree among themselves and with the turbulent flat plate solution; however uncertainty analysis revealed drag measurement accuracy of only "0.02 N at best using the proximity sensor measurement system. In general, the difference in drag on the flat plate with and without bubbles as indicated by the proximity sensor was less than 0.02 N, thus it is impossible to determine if the tiny trapped bubbles did indeed provide drag reduction. The temporal evolution of drag reduction using the trapped bubble array was also studied, but changes in drag appeared to be within the noise of the drag measurements. Finally, the efficiency of this drag reduction method was investigated in the laboratory setting. The trapped bubbles used in this drag reduction method are formed on the plate surface by electrolysis in the conductive holes, but not all of the gas produced in this process collects to form the trapped bubbles, and some energy is dissipated due to resistance in the water. To quantify the efficiency of this system, bubble formation efficiency plots (which map power input as a function of time to fill the bubble plate) were analytically determined and compared to the actual time to fill the bubble plate for various power input levels. The system approaches maximum (~95%) efficiency at lower power input levels (7.22 W/m2), requiring approximately 15 minutes to fill the bubble plate; conversely, the plate approaches 50% efficiency at high power input level (262 W/m2) while the plate fills within 2 minutes.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by Springer. This book was released on 2013-12-20 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ten Chapters in Turbulence written by Peter A. Davidson and published by Cambridge University Press. This book was released on 2013 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading experts summarize our current understanding of the fundamental nature of turbulence, covering a wide range of topics.

Download or read book Micro and Nanobubbles written by Hideki Tsuge and published by CRC Press. This book was released on 2014-08-04 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbubbles and nanobubbles have several characteristics that are comparable with millimeter- and centimeter-sized bubbles. These characteristics are their small size, which results in large surface area and high bioactivity, low rising velocity, decreased friction drag, high internal pressure, large gas dissolution capacity, negatively charged surface, and ability to be crushed and form free radicals. Microbubbles and nanobubbles have found applications in a variety of fields such as engineering, agriculture, environment, food, and medicine. Microbubbles have been successfully used in aquacultures of oysters in Hiroshima, scallops in Hokkaido, and pearls in Mie Prefecture, Japan. This field has shown a strong potential for growth. This book comprehensively discusses microbubbles and nanobubbles and their application in aquaculture, environment, engineering, medicine, stock raising, agriculture, and marine industry. It presents their potential as a new technology that can be utilized globally.

Download or read book Modification in Drag of Turbulent Boundary Layers Resulting from Manipulation of Large scale Structures written by T. C. Corke and published by . This book was released on 1981 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drag Reduction in Fluid Flows written by Robert H. J. Sellin and published by . This book was released on 1989 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reduction of Drag on a Flat Plate Through the Injection of Bubbles Into the Turbulent Boundary Layer written by John H. Pierse and published by . This book was released on 2004 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Direct and Large Eddy Simulation VIII written by Hans Kuerten and published by Springer Science & Business Media. This book was released on 2011-10-05 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume continues previous DLES proceedings books, presenting modern developments in turbulent flow research. It is comprehensive in its coverage of numerical and modeling techniques for fluid mechanics. After Surrey in 1994, Grenoble in 1996, Cambridge in 1999, Enschede in 2001, Munich in 2003, Poitiers in 2005, and Trieste in 2009, the 8th workshop, DLES8, was held in Eindhoven, The Netherlands, again under the auspices of ERCOFTAC. Following the spirit of the series, the goal of this workshop is to establish a state-of-the-art of DNS and LES techniques for the computation and modeling of transitional/turbulent flows covering a broad scope of topics such as aerodynamics, acoustics, combustion, multiphase flows, environment, geophysics and bio-medical applications. This gathering of specialists in the field was a unique opportunity for discussions about the more recent advances in the prediction, understanding and control of turbulent flows in academic or industrial situations.

Download or read book New Frictional Resistance Law for Smooth Plates written by F. Schultz-Grunow and published by . This book was released on 1941 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: From measurements in the free boundary layer of a plate the laws governing the velocity distribution and a new resistance law are derived which, by increasing Reynolds number Re(sub x) afford lower resistance values than the logarithmic law. The transverse velocities, the shearing stress, and the mixing path profiles were also defined.

Download or read book Scientific Bulletin written by and published by . This book was released on 1980 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: