Results 21 to 30 of about 265,857 (305)
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
Colloquium: Theory of Drag Reduction by Polymers in Wall Bounded Turbulence [PDF]
, 2007 The flow of fluids in channels, pipes or ducts, as in any other wall-bounded flow (like water along the hulls of ships or air on airplanes) is hindered by a drag, which increases many-folds when the fluid flow turns from laminar to turbulent.
Bellakhel, G. +21 more
core +1 more source
Bubble Drag Reduction Requires Large Bubbles [PDF]
Physical Review Letters, 2016 In the maritime industry, the injection of air bubbles into the turbulent boundary layer under the ship hull is seen as one of the most promising techniques to reduce the overall fuel consumption. However, the exact mechanism behind bubble drag reduction is unknown.
Verschoof, R. +3 more
openaire +5 more sources
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
Geofluids, 2021 Slick-water can effectively reduce the flow drag of fracturing fluid. Many studies have focused on the drag reduction performance of slick-water in wellbore and perforation, but there has been little research on drag reduction characteristics in fracture
Zhiyu Liu +7 more
doaj +1 more source
Effect of Drag Reducing Agents - Polymers and Surfactants Alone and in Combination on Efflux Time in Gravity-Driven Flow Systems [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2022 Determination of efflux time for draining water, a Newtonian liquid from a large cylindrical open tank through a hole located at the center of the bottom of the tank has been used to study the effect of the addition of water-soluble drag-reducing agents.
V. Satish +3 more
doaj +1 more source
Reynolds-dependence of turbulent skin-friction drag reduction induced by spanwise forcing [PDF]
, 2016 This paper examines how increasing the value of the Reynolds number $Re$ affects the ability of spanwise-forcing techniques to yield turbulent skin-friction drag reduction.
Gatti, Davide, Quadrio, Maurizio
core +2 more sources