Results 31 to 40 of about 37,322 (309)

Numerical analysis of drag reduction of hydrofoil appendage for high-speed ship

Zhongguo Jianchuan Yanjiu, 2022
ObjectiveIn order to reduce the wave-making resistance of high-speed ships, this paper proposes an innovative hydrofoil appendage with a drag reduction effect.
Qian CHEN, Zhihua LIU, Gangquan ZHAO, Wentao LIU   +3 more
doaj   +1 more source

The Modelling of the Multiphase Flow Mechanics in Air Lubrication Systems and Their Interaction with Appendages: A Review

Journal of Marine Science and Engineering
This review paper investigates the use of air lubrication to reduce ship hull skin frictional drag, a technology whose fundamental drag-reduction mechanisms and impact on seakeeping are increasingly being studied through Computational Fluid Dynamics (CFD)
David Hitchmough, Eddie Blanco-Davis, Andrew Spiteri, Mehdi Seddighi, Onur Yuksel, G Viknash Shagar, Jin Wang   +6 more
doaj   +1 more source

Enhanced Drag in Pipe Turbulent Flow by an Aqueous Electrolyte: an Electroviscous Effect [PDF]

, 2009
Drag enhancement is reported for turbulent pipe flow of aqueous electrolyte solutions. No electroviscous effect was obtained with laminar flow. Nor was any unusual pressure drop observed for laminar or turbulent flow of non-electrolyte aqueous solutions ...
Chen, John J. J., Doherty, AP, Spedding, P. L., Chen, John, Bénard, Emmanuel, Benard, E, Doherty, Andrew P., Spedding, PL, Benard, E.   +8 more
core   +1 more source

Drag enhancement and drag reduction in viscoelastic flow [PDF]

Physical Review Fluids, 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. However, in inertia-dominated flow at high $\mbox{Re}$ and low fluid elasticity $El$, a reduction in turbulent frictional drag is caused by an intricate ...
Varshney, Atul, Steinberg, Victor
openaire   +2 more sources

Turbulent channel flow near maximum drag reduction: simulations, experiments and mechanisms

, 2003
It is well known that the drag in a turbulent flow of a polymer solution is significantly reduced compared to Newtonian flow. Here we consider this phenomenon by means of a direct numerical simulation of a turbulent channel flow.
Hulsen, MA, Brule, van den, B.H.A.A., Hunt, J.C.R., Boersma, BJ, Nieuwstadt, FTM, Nieuwstadt, F.T.M., Hunt, JCR, Hulsen, M.A., Van Den Brule, BHAA, Patasinski, PK, Ptasinski, P.K., Boersma, B.J.   +11 more
core   +1 more source

Experimental Study on the Drag Reduction of Surfactant and Microgrooves

Chemical Engineering Transactions, 2020
In the drag-reducing surfactant solution, the scale of near-wall vortices could be enlarged, and the drag reduction mechanism of longitudinal microgrooves was related to the scale of near-wall streamwise vortices.
Chonghai Huang, Yuansheng Lin, Bangming Li, Jinlan Gou, Wei Wang, Kai Chen, Xiaohu Yang, Hongkuan Zhou   +7 more
doaj   +1 more source

Flexible conformable hydrophobized surfaces for turbulent flow drag reduction

, 2015
Spreadsheets and images. Spreadsheet of physical dimensions of sample surface features and corresponding SEM and/or confocal microscope images. Spreadsheet of Gaussian fitting to velocity profiles.
Fairhurst, David, Geraldi, NR, Newton, MI, Brennan, Joseph, Morris, Robert, Geraldi, N, Brennan, JC, McHale, Glen, Newton, M, Morris, R, Morris, RH, Newton, Michael, Fairhurst, D, Geraldi, Nicasio, McHale, G, Brennan, J   +15 more
core   +1 more source

Drag reduction via turbulent boundary layer flow control [PDF]

, 2017
The final publication is available at Springer via http://dx.doi.org/10.1007/s11431-016-9013-6Turbulent boundary layer control (TBLC) for skin-friction drag reduction is a relatively new technology made possible through the advances in computational ...
Zheng, Yao, Ferrer Vaccarezza, Esteban, Jacques Periaux, Jordi Pons-Prats, Abbas, Adel, Yao Zheng, Periaux, Jacques Francis, Adel Abbas, Gabriel Bugeda, Eusebio Valero, Bugeda Castelltort, Gabriel, Fu, Song, Esteban Ferrer, Song Fu, Pons Prats, Jordi, Valero, Eusebio   +15 more
core   +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, Marston, Jeremy, Chan, Derek Y. C., Thoroddsen, Sigurdur T   +3 more
openaire   +3 more sources

Quantitative Analysis of Drag Reduction Methods for Blunt Shaped Automobiles

Applied Sciences, 2020
In fluid mechanics, drag related problems aim to reduce fuel consumption. This paper is intended to provide guidance for drag reduction applications on cars.
Ferenc Szodrai
doaj   +1 more source