Results 241 to 250 of about 208,538 (280)

Floatable Syntactic Magnesium Foam as a Marangoni-Induced Propulsion Microboat. [PDF]

Materials (Basel)
Thalmaier G, Sechel NA, Vida-Simiti I.
europepmc   +1 more source

Analytical framework for evaluating NMPC-based robot navigation in fluid environments. [PDF]

PLoS One
Ali M, Das S, Townley S.
europepmc   +1 more source

<i>Microraptor</i> reveals specialized gliding capabilities in multiwinged early paravians. [PDF]

Proc Natl Acad Sci U S A
Hefler C, Wang Y, Wang X, Zheng X, Kaye TG, Grosmougin M, Chotard M, Barlow L, Qiu H, Dececchi TA, Habib MB, Shyy W, Pittman M.   +12 more
europepmc   +1 more source

An analytical model for quantitative evaluation of friction drag in directional sliding drilling. [PDF]

Sci Rep
Ma Z, Zhang H, Hu H, Li G, Tian S, Zhang Y, Wang T.   +6 more
europepmc   +1 more source

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Experimental study on the effect of high-molecular polymer as drag reducer on drag reduction rate of pipe flow

Journal of Petroleum Science and Engineering, 2019
Abstract Three types of relatively high-molecular polymer were used to investigate drag reduction in single-phase flow through a horizontal, 12.7-mm pipe. Diesel oil and a mixture of diesel oil and model oil were employed as the oil phase. The effect of various factors on the drag reduction rate was investigated.
Qing Quan, Shouxi Wang, Li Wang, Ying Shi, Jin Xie, Xiaodan Wang, Suwen Wang   +6 more
openaire   +3 more sources

Investigation on the drag reduction and thermal protection properties of the porous opposing jet in the supersonic flow: A parametric study with constant mass flow rate

Aerospace Science and Technology, 2021
Abstract The studies of the influencing factors of the porous opposing jet on drag reduction and thermal protection have shown that an important performance of the drag reduction variation and thermal protection effect caused by structural parameters is the variation of mass flow rate.
Chen Ji, Bing Liu, Wei Huang, Shi-bin Li, Li Yan   +4 more
openaire   +3 more sources

Analysis of shear rate effects on drag reduction in turbulent channel flow with superhydrophobic wall

Journal of Hydrodynamics, 2013
We examined the shear rate effect on drag reduction of superhydrophobic surfaces with different slip lengths. For this purpose, turbulent channel flow was considered at the friction Reynolds numbers of Re τ = 180, 395, 500.
Nowrouz Mohammad Nouri, Mohammad Saadat Bakhsh, Setareh Sekhavat   +2 more
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Active drag reduction using selective low rate suction

18th Applied Aerodynamics Conference, 2000
The objective of this study is to determine the effectiveness of using an active sensor/suction technique to identify and remove low-speed streaks from a turbulent boundary layer in order to reduce skin friction. An experimental investigation was conducted in both water and wind tunnel facilities to visualize streak development and removal and also to ...
Michael Kerho, Joseph Heid, Brian Kramer, Terry Ng   +3 more
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Turbulent Drag Reduction by Polymer Containing Paint: Simultaneous Measurement of Skin Friction and Release Rate

2010 14th International Heat Transfer Conference, Volume 2, 2010
Performance test for polymer containing trial antifouling paint was carried out experimentally. This trial paint is made by adding a polymer (PEO) to commercial antifouling paint for ship hull. Our developing paint has a function of leaching out the polymer and eventually reduces the skin frictional drag by the effect of dissolved polymer when the ship
Masaaki Motozawa, Toshihisa Ito, Ayumu Matsumoto, Hirotomo Ando, Toshihiko Ashida, Tetsuya Senda, Yasuo Kawaguchi   +6 more
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Effect of dispersing time on the prediction equation of drag reduction rate and its application in the short distance oil pipeline

Petroleum Science and Technology, 2018
The effect of the drag reducer, which is a kind of effective chemical additive for the pipelines, is closely related to its dissolution dispersity in the oil product.
Danfu Cao, Chuanxian Li, Hao Li, Fei Yang   +3 more
openaire   +1 more source