an actual reduction in the coefficient of friction. However, it is clear that compared to barrier film B there is a significant reduction in skin friction. Methods Objective Results Conclusions A Motorized Sliding Sled Apparatus for Measuring the Coefficient of Friction of Human Skin in vivo Gary Grove, cyberDERM Clinical Studies, Broomall, PA Submarines - Polymer Drag Reduction Decades of research have identified two very promising techniques for reducing friction drag: polymers and microbubbles, which have shown 70-80% reduction in skin-friction drag coefficient in the ... Polymer/riblet combination for hydrodynamic skin friction ... injecting a drag reducing polymer into the individual groove valleys at multiple points along each groove such that amounts of the polymer needed to reduce skin friction along the entire length of the surface are minimized, infecting the drag reducing polymer by means of an array of slots or holes angled such that the injected polymer is ...
CHAPTER 6 PILE FOUNDATIONS Section I. GROUP BEHAVIOR ... For piles which rely on skin friction in a ... reduction in settlement provided by friction be considered in lieu of friction piles. 6-6.
Center for Turbulence Research Annual Research Briefs 2010 ... Skin-friction drag reduction has significant practical value for marine vehicles. It is known that skin-friction drag accounts for more than 60% of the total drag of a cargo ship. For several decades, various methods have been explored to reduce the skin-friction drag. Polymer/riblet combination for hydrodynamic skin friction ... injecting a drag reducing polymer into the individual groove valleys at multiple points along each groove such that amounts of the polymer needed to reduce skin friction along the entire length of the surface are minimized, infecting the drag reducing polymer by means of an array of slots or holes angled such that the injected polymer is ... How to Reduce Friction between Surfaces
Direct measurements and analysis of skin friction and ...
Skin friction reduction by slot injection at mach 0.8 in ... Skin friction reduction by slot injection at mach 0.8 Responsibility Victor Zakkay and Chi R. Wang ; prepared by New York University, Westbury, N.Y., for Langley Research Center. Time-Resolved PIV Investigation on the Skin Friction ... The average skin friction reduction rates are calculated as 7.95% for the Z06 plane and 2.73% for the Z00 plane, respectively. Also it is revealed that the streamwise local skin friction distributions at two spanwise locations exhibit negative correlation. Skin friction reduction in supersonic flow by injection ...
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Journals PDF | Frontiers in Heat and Mass ... - Thermal-Fluids Central have analyzed the effect of non-uniform multiple slot injection and wall enthalpy on the ... layer in adverse pressure gradient and skin friction reduction on control. LAMINAR AND TURBULENT BOUNDARY LAYER ... - Acumen distribution of the mean skin friction coefficient (Cf) on the wall for different ..... Drag reduction inspired by nature has special interest in the field of fluid .... local uniform blowing was imposed in a cross flow through a thin slot. ...... Bandyopadhyay, P. R. & Ahmed, A. Turbulent boundary layers subjected to multiple curvatures.
Home > ; Publications > ; AIAA Journal > ; Volume 13, Issue 8 > ; Skin Friction Reduction by Injection Through Combinations of Slots and Porous Sections
SKIN FRICTION REDUCTION IN SUPERSONIC FLOW BY INJECTION THROUGH SLOTS, POROUS SECTIONS AND COMBINATIONS OF THE TWO By Joseph A. Schetz and Johannes vanOvereem Virginia Polytechnic Institute and State University INTRODUCTION Fluid injection schemes for thermal protection and, more recently, skin Skin friction reduction by slot injection at Mach 0.8 Download Citation on ResearchGate | Skin friction reduction by slot injection at Mach 0.8 | Surface skin friction, boundary layer profiles and turbulent intensity due to axially symmetric ... Direct measurements at Mach 6 of turbulent skin-friction ... The surface skin-friction reduction downstream of one to four successive flush slots injecting at an angle of 10 deg into a turbulent Mach 6 boundary layer has been determined from direct measurements of surface shear. Increasing the number of succeeding slots increases the skin-friction reduction, but this trend reverses at high injection rates. Non-uniform multiple slot injection (suction) or wall ...
Abstract Experiments were conducted to determine the reduction in surface skin friction and the effectiveness of surface cooling downstream of one to four successive flush slots injecting cold air at an angle of 10 deg into a turbulent Mach 6 boundary layer. Skin Friction Reduction by Injection Through Combinations of … Home > ; Publications > ; AIAA Journal > ; Volume 13, Issue 8 > ; Skin Friction Reduction by Injection Through Combinations of Slots and Porous Sections Global effect of local skin friction drag reduction in spatially … Global effect of local skin friction drag reduction in spatially developing turbulent boundary layer - Volume 805 - A. Stroh, Y. Hasegawa, P. Schlatter, B. Frohnapfel Park, J. & Choi, H. 1999 Effects of uniform blowing or suction from a spanwise slot on a turbulent boundary layer flow. Film-Cooling Effectiveness and Skin Friction in Hypersonic …