Results 1 to 10 of about 208,419 (164)
Prediction of Drag Reduction Rate in Turbulent Channel Flow Based on BP Neural Network [PDF]
E3S Web of Conferences, 2020 The technology of turbulent drag reduction by viscoelastic additives cannot be widely applied in practical engineering due to the difficulty in judging the effect of drag reduction.
Cao Yuchen, Yang Yongwen
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Fabrication and Drag Reduction Performance of Bionic Surfaces Featuring Staggered Shield Scale Structures [PDF]
BiomimeticsTo investigate the drag reduction mechanism of shark skin placoid scales and develop high-efficiency drag-reducing surfaces, this study designed and fabricated a biomimetic shark skin surface featuring staggered microscale groove structures.
Xin Gu, Pan Cao, Xiuqin Bai, Yifeng Fu
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Experimental Study 0f Drag Reduction Phenomena in the Horizontal Tube with Nano SiO2 by Neural Network - Genetic Algorithm [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2021 In this study, nano-silica oxide's effect as a Drag Reducing Agent (DRA) of water flow in a 12.7 and 25.4 mm galvanized pipe was investigated. The studied parameters include Nano silica oxide concentration, Flow rate, temperature, and tube pipe diameter.
Fahimeh Gharekhani +2 more
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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
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Nihon Kikai Gakkai ronbunshu, 2022 Drag reduction by bubble injection in turbulent boundary layers was investigated using a 36-m-long flat-bottom model ship. The model ship was towed at 8.0 m/s, resulting in a downstream-distance-based Reynolds number as high as 2.9 × 108.
Taiji TANAKA +5 more
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Mesoscopic modeling of heterogeneous boundary conditions for microchannel flows [PDF]
, 2005 We present a mesoscopic model of the fluid-wall interactions for flows in microchannel geometries. We define a suitable implementation of the boundary conditions for a discrete version of the Boltzmann equations describing a wall-bounded single phase ...
Benzi, R. +4 more
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BMC Chemistry, 2023 Different from common hydrophobic associative polymers, a new hydrophobic associative polyacrylamide (HAPAM) with ultra-long side chains was synthesized and aimed to be used as drag reducer in this work.
Xianwu Jing +3 more
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Research Progress of Air Lubrication Drag Reduction Technology for Ships
Fluids, 2022 Air lubrication is a promising drag reduction technology for ships because it is considered to reduce the skin-friction resistance of ships by changing the energy of turbulent boundary layers.
Hai An, Haozhe Pan, Po Yang
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Reynolds-Averaged Simulation of Drag Reduction in Viscoelastic Pipe Flow with a Fixed Mass Flow Rate
Journal of Marine Science and Engineering, 2023 A high molecular polymer solution with viscoelasticity has the effect of reducing frictional drag, which is quite practical for energy saving. Effective simulations of viscoelastic flows in a pipeline with a high Reynolds number is realized by incorporating the constitutive equation of viscoelasticity into the k−ε−v′2¯−f turbulence model.
Zhuoyue Li +5 more
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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
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