Results 41 to 50 of about 265,857 (305)

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

A Periodically Rotating Distributed Forcing of Flow over a Sphere for Drag Reduction

Mathematics, 2023
In the present study, we propose a periodically rotating distributed forcing for turbulent flow over a sphere for its drag reduction. The blowing/suction forcing is applied on a finite slot of the sphere surface near the flow separation, and unsteady ...
Donggun Son, Jungil Lee
doaj   +1 more source

Frictional drag reduction by bubble injection in turbulent boundary layers: Experiment with long model ship and full-scale estimation

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, Yoshihiko OISHI, Hyun Jin PARK, Yuji TASAKA, Yuichi MURAI, Chiharu KAWAKITA   +5 more
doaj   +1 more source

Exploring Patients’ Profiles Associated With the Resolution of Acute Calcium Pyrophosphate Arthritis Treated With Colchicine and Prednisone: Post Hoc Analysis of a Randomized Controlled Trial

Arthritis Care &Research, EarlyView.
Objective The objective was to identify factors determining acute arthritis resolution and safety with colchicine and prednisone in acute calcium pyrophosphate (CPP) crystal arthritis. Methods We conducted a post hoc analysis of the COLCHICORT trial, which compared colchicine and prednisone for the treatment of acute CPP crystal arthritis, using a ...
Tristan Pascart, Laurène Norberciak, Pascal Richette, Pierre Robinet, Aurore Pacaud, Gauthier Marchasson, Thibault Rabin, Hélène Luraschi, Pierre Maciejasz, Anne‐France Georgel, Augustin Latourte, Hang‐Korng Ea, Sébastien Ottaviani, Charlotte Jauffret, Vincent Ducoulombier   +14 more
wiley   +1 more source

Numerical simulation study on the drag reduction characteristics of grooves-microbubbles coupling surfaces

International Journal of Metrology and Quality Engineering
Surface drag reduction technologies can significantly reduce the resistance during ship navigation, enhancing speed, efficiency and adaptability under various operating conditions.
Li Tianjian, Yang Tianlong, Dong Qin, Sun Xizhi, Wu Tao, Xu Ziqi   +5 more
doaj   +1 more source

Numerical Study on Drag Reduction of Superhydrophobic Surfaces with Conical Microstructures in Laminar Flow [PDF]

Journal of Applied Fluid Mechanics
Superhydrophobic surfaces have garnered attention for their ability to decrease fluid resistance, which can significantly reduce energy consumption. This study aims to accurately capture critical flow phenomena in a microchannel and explore the internal ...
Y. Xu, C. Ruan, Z. Zhang
doaj   +1 more source

Theory of Concentration Dependence in Drag Reduction by Polymers and of the MDR asymptote

, 2003
A simple model of the effect of polymer concentration on the amount of drag reduction in turbulence is presented, simulated and analyzed. The qualitative phase diagram of drag coefficient vs.
E. de Angelis, Emily S. C. Ching, Itamar Procaccia, Nizan Horesh, P.-G. de Gennes, P. S. Virk, P. S. Virk, P. S. Virk, Roberto Benzi   +8 more
core   +1 more source

Additive Equivalence in Turbulent Drag Reduction by Flexible and Rodlike Polymers [PDF]

, 2005
We address the "Additive Equivalence" discovered by Virk and coworkers: drag reduction affected by flexible and rigid rodlike polymers added to turbulent wall-bounded flows is limited from above by a very similar Maximum Drag Reduction (MDR) asymptote ...
A. S. Monin, E. De Angelis, E. Hinch, E. Hinch, Emily S. C. Ching, H. Brenner, Itamar Procaccia, M. Doi, M. Manhart, M. V. Zagarola, P. S. Virk, P. S. Virk, R. Benzi, Roberto Benzi, S. E. Pope, T. S. Lo, V S. L’vov, V. S. L’vov, Victor S. L’vov   +18 more
core   +2 more sources

Interaction between Molten Al‐Killed Mn–B Steel and Carbon‐Bonded MgO Refractories Based on Recyclates

Advanced Engineering Materials, EarlyView.
High‐temperature interactions between low‐sulfur Al‐killed Mn–B steel and MgO–C refractories (0 and 50 wt% recyclates) are studied via finger immersion tests (1600 °C). Surface‐active elements influence infiltration. MgO/CaS layer forms, along with spinel and calcium silicate.
Matheus Roberto Bellé, Lukas Neubert, Anton Yehorov, Till M. J. Stadtmüller, Christos G. Aneziris, Olena Volkova   +5 more
wiley   +1 more source

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source