Results 41 to 50 of about 4,765,914 (397)
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
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
Exceeding the asymptotic limit of polymer drag reduction [PDF]
, 2017 The drag of turbulent flows can be drastically decreased by addition of small amounts of high molecular weight polymers. While drag reduction initially increases with polymer concentration, it eventually saturates to what is known as the maximum drag ...
Choueiri, George H. +2 more
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
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
Drag reduction by application of aerodynamic devices in a race car
Advances in Aerodynamics, 2021 In this era of fast-depleting natural resources, the hike in fuel prices is ever-growing. With stringent norms over environmental policies, the automotive manufacturers are on a voyage to produce efficient vehicles with lower emissions.
Devang S. Nath +3 more
semanticscholar +1 more source
Drag Reduction by Leidenfrost Vapor Layers [PDF]
Physical Review Letters, 2011 We demonstrate and quantify a highly effective drag reduction technique that exploits the Leidenfrost effect to create a continuous and robust lubricating vapor layer on the surface of a heated solid sphere moving in a liquid. Using high-speed video, we show that such vapor layers can reduce the hydrodynamic drag by over 85%.
Vakarelski, Ivan Uriev +3 more
openaire +3 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
Study on Aerodynamic Drag Reduction at Tail of 400 km/h EMU with Air Suction-Blowing Combination
Machines, 2023 In order to further reduce the aerodynamic drag of High-speed Electric Multiple Units (EMU), an active flow control drag reduction method combining air suction and blowing is proposed at the rear of the EMU train.
Hongjiang Cui +3 more
doaj +1 more source
Impact of the Microstructure of Polymer Drag Reducer on Slick-Water Fracturing
Geofluids, 2017 Many studies have focused on the drag reduction performance of slick-water, but the microdrag reduction mechanism remains unclear since the microstructure of the drag reducer and its effect on this mechanism have not been well studied. In this study, the
Zhi-yu Liu +5 more
doaj +1 more source