Results 21 to 30 of about 37,322 (309)
Drag reduction by a linear viscosity profile [PDF]
Physical Review E, 2004 Drag reduction by polymers in turbulent flows raises an apparent contradiction: the stretching of the polymers must increase the viscosity, so why is the drag reduced? A recent theory proposed that drag reduction in agreement with experiments is consistent with the effective viscosity growing linearly with the distance from the wall.
DE ANGELIS, ELISABETTA +5 more
openaire +4 more sources
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
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
Effectiveness of active flow control for turbulent skin friction drag reduction [PDF]
, 2011 The effectiveness of the opposition control method proposed by Choi et al. [J. Fluid Mech. 262, 75 (1994)] has been studied using direct numerical simulations.
Chung, Yongmann M. +3 more
core +1 more source
Change in drag, apparent slip and optimum air layer thickness for laminar flow over an idealised superhydrophobic surface [PDF]
, 2013 Analytic results are derived for the apparent slip length, the change in drag and the optimum air layer thickness of laminar channel and pipe flow over an idealised superhydrophobic surface, i.e. a gas layer of constant thickness retained on a wall.
Newton, M.I. +13 more
core +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
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
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
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