Results 31 to 40 of about 4,765,914 (397)
Investigation of a drag reduction on a circular cylinder in rotary oscillation [PDF]
, 2001 Drag reduction in two-dimensional flow over a circular cylinder, achieved using rotary oscillation, was investigated with computational simulations. In the experiments of Tokumaru & Dimotakis (1991), this mechanism was observed to yield up to 80% drag ...
Leonard, A., Shiels, D.
core +1 more source
Numerical Simulation of Supersonic Carman Curve Bodies with Aerospike
International Journal of Aerospace Engineering, 2021 Drag reduction is one of the important problems for the supersonic vehicles. As one of the drag reduction methods, aerospike has been used in some equipment because of its good drag reduction effect.
HaiLong Zhao +5 more
doaj +1 more source
Drag enhancement and drag reduction in viscoelastic flow [PDF]
, 2018 Creeping flow of polymeric fluid without inertia exhibits elastic instabilities and elastic turbulence accompanied by drag enhancement due to elastic stress produced by flow-stretched polymers.
Steinberg, Victor, Varshney, Atul
core +4 more sources
Egyptian Journal of Petroleum, 2016 The present work studies the effect of a commercially type of drag reducing agent on the crude oil production flow lines located in the Egyptian western desert (Fagour field) and owned by Khalda Petroleum Company.
M.H. Hassanean +4 more
doaj +1 more source
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2011 The interaction of the overlying turbulent flow with riblets, and its impact on their drag reduction properties are analysed. In the so-called viscous regime of vanishing riblet spacing, the drag reduction is proportional to the riblet size, but for larger riblets the proportionality breaks down, and the drag reduction eventually becomes ...
García Mayoral, Ricardo +1 more
openaire +3 more sources
Fluid Drag Reduction by Magnetic Confinement
Langmuir, 2022 The frictional forces of a viscous liquid flow are a major energy loss issue and severely limit microfluidics practical use. Reducing this drag by more than a few tens of percent remain illusive. Here, we show how cylindrical liquid-in-liquid flow leads to drag reduction of 60-99% for sub mm and mm sized channels, irrespective of whether the viscosity ...
Dev, Arvind Arun +3 more
openaire +4 more sources
Drag reduction methods at solid-liquid interfaces
Friction, 2021 Friction drag is a nonnegligible matter when relative motion happens between solid and liquid phase, which brings many inconveniences in ship navigation, fluid transportation, microfluid devices, etc.
Min Liu, Liran Ma
semanticscholar +1 more source
Streamwise-traveling waves of spanwise wall velocity for turbulent drag reduction [PDF]
, 2009 Waves of spanwise velocity imposed at the walls of a plane turbulent channel flow are studied by Direct Numerical Simulations. We consider sinusoidal waves of spanwise velocity which vary in time and are modulated in space along the streamwise direction.
Quadrio, M., Ricco, P., Viotti, C.
core +3 more sources
A Simple Passive Device for the Drag Reduction of an Ahmed Body
Journal of Applied Fluid Mechanics, 2021 In this paper, a simple passive device is proposed for drag reduction on the 35° Ahmed body. The device is a simple rectangular flap installed at the slant surface of the model to investigate the effect of slant volume, formed between the device and the ...
N. A. Siddiqui, M. Chaab
semanticscholar +1 more source
Model-based design of riblets for turbulent drag reduction [PDF]
Journal of Fluid Mechanics, 2020 Both experiments and direct numerical simulations have been used to demonstrate that riblets can reduce turbulent drag by as much as $10\,\%$, but their systematic design remains an open challenge.
W. Ran, A. Zare, M. Jovanović
semanticscholar +1 more source