Results 51 to 60 of about 4,765,914 (397)
Numerical analysis of drag reduction of hydrofoil appendage for high-speed ship
Zhongguo Jianchuan Yanjiu, 2022 ObjectiveIn order to reduce the wave-making resistance of high-speed ships, this paper proposes an innovative hydrofoil appendage with a drag reduction effect.
Qian CHEN +3 more
doaj +1 more source
Journal of Marine Science and EngineeringThis review paper investigates the use of air lubrication to reduce ship hull skin frictional drag, a technology whose fundamental drag-reduction mechanisms and impact on seakeeping are increasingly being studied through Computational Fluid Dynamics (CFD)
David Hitchmough +6 more
doaj +1 more source
Drag Reduction And Heating [PDF]
Progress in Canadian Mechanical Engineering, 2018 Paper presented at 2018 Canadian Society of Mechanical Engineers International Congress, 27-30 May 2018. ; An external force is required to maintain the relative movement of horizontal plates. It is shown that this force is reduced when the plates are subject to a spatially distributed heating.
Floryan, Jerzy M. +2 more
openaire +2 more sources
Bubbly Turbulent Drag Reduction Is a Boundary Layer Effect [PDF]
, 2007 In turbulent Taylor-Couette flow, the injection of bubbles reduces the overall drag. On the other hand, rough walls enhance the overall drag. In this work, we inject bubbles into turbulent Taylor-Couette flow with rough walls (with a Reynolds number up ...
Berg, Thomas H. van den +3 more
core +2 more sources
Drag Reduction by Polymers in Wall Bounded Turbulence
, 2004 We address the mechanism of drag reduction by polymers in turbulent wall bounded flows. On the basis of the equations of fluid mechanics we present a quantitative derivation of the "maximum drag reduction (MDR) asymptote" which is the maximum drag ...
A. N. Beris +8 more
core +1 more source
Turbulent drag reduction over curved walls [PDF]
Journal of Fluid Mechanics, 2020 This work studies the effects of skin-friction drag reduction in a turbulent flow over a curved wall, with a view to understanding the relationship between the reduction of friction and changes to the total aerodynamic drag.
J. Banchetti, P. Luchini, M. Quadrio
semanticscholar +1 more source
Additive Equivalence in Turbulent Drag Reduction by Flexible and Rodlike Polymers [PDF]
, 2005 We address the "Additive Equivalence" discovered by Virk and coworkers: drag reduction affected by flexible and rigid rodlike polymers added to turbulent wall-bounded flows is limited from above by a very similar Maximum Drag Reduction (MDR) asymptote ...
A. S. Monin +18 more
core +2 more sources
Experimental Study on the Drag Reduction of Surfactant and Microgrooves
Chemical Engineering Transactions, 2020 In the drag-reducing surfactant solution, the scale of near-wall vortices could be enlarged, and the drag reduction mechanism of longitudinal microgrooves was related to the scale of near-wall streamwise vortices.
Chonghai Huang +7 more
doaj +1 more source
Effect of dolphin-inspired transverse wave microgrooves on drag reduction in turbulence
The Physics of FluidsThe transverse skin of dolphins exhibits a remarkable drag reduction effect. Although previous studies have identified the drag reduction effect of transverse grooves, no clear guidelines exist regarding the impact of groove parameters on turbulent drag ...
Tengfei Zheng +9 more
semanticscholar +1 more source
Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants
Materials, 2020 Polymer additives and surfactants as drag reduction agents have been widely used in the field of fluid drag reduction. Polymer additives can reduce drag effectively with only a small amount, but they degrade easily.
Yunqing Gu +4 more
semanticscholar +1 more source