Results 31 to 40 of about 897,659 (282)

Increasing flow capacity and reducing drag in microtubes using drag-reducing polymer [PDF]

Iranian Journal of Chemical Engineering, 2020
Decreasing pressure losses in microtubes is an important subject, especially when increase in flow capacity is required. In the same pumping power, decreasing the pressure drops is coincides with increasing the fluid flow rate passing through a microtube.
M.H. Akbari, M. Rahimi, H.R. Karami
doaj   +1 more source

Bionic Design of a Potato Digging Shovel with Drag Reduction Based on the Discrete Element Method (DEM) in Clay Soil

Applied Sciences, 2020
The resistance of ordinary potato digging shovels can increase dramatically when used in a clay soil because of the adhesion between the soil and shovel. In this paper, a new type of bionic potato digging shovel was designed to decrease adhesion.
Junwei Li, Xiaohu Jiang, Yunhai Ma, Jin Tong, Bin Hu   +4 more
doaj   +1 more source

Drag Reduction Characteristics of Bionic Structure Composed of Grooves and Mucous Membrane Acting on Turbulent Boundary Layer [PDF]

Journal of Applied Fluid Mechanics, 2022
The biological surface structure comprising fish scales and a mucous membrane exhibits good turbulent drag reduction ability. Based on this structure, a bionic frictional drag reduction model composed of a grooved structure and mucous membrane was ...
K. Zhang, C. Ma, J. Zhang, B. Zhang, B. Zhao   +4 more
doaj   +1 more source

Comparative analysis of drag reduction characteristics of two-type riblets based on numerical simulation

Xibei Gongye Daxue Xuebao, 2022
Turbulent drag reduction has always been a hot issue in fluid mechanics. Among various turbulent drag reduction methods, riblets has attracted wide attention due to its simple structure and convenient application.
DU Shuya, SANG Weimin, PANG Run
doaj   +1 more source

Eco-friendly polysaccharide coatings for antifouling and drag-reduction and potential application for marine devices

Friction, 2023
Traditional antifouling agents usually have a certain toxic effect on marine environments and non-target organisms. In this study, Dictyophora indusiata polysaccharide (DIP) was applied as a natural antifouling surface modifier to prepare the surface ...
Hao Yang, Liguo Qin, Wenhui Zhao, Fagla Jules Mawignon, Hui Guo, Yongkang Wu, Yali Zhang, Guangneng Dong   +7 more
semanticscholar   +1 more source

Multistage Gradient Bioinspired Riblets for Synergistic Drag Reduction and Efficient Antifouling

ACS Omega, 2023
Shark skin-inspired riblets have represented the tremendous potential for drag reduction (DR) and antifouling in submarine, ship, and so on. Most studies simplified the complex denticle embedded in the shark skin into the single-stage riblet with uniform
Xianxian Cui, Dengke Chen, Huawei Chen
semanticscholar   +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

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

Simulation analysis tentative scheme of drag reduction by additives in water cannon system

Zhongguo Jianchuan Yanjiu, 2019
[Objectives]In order to increase the range and flow rate of the water cannon system,drag reduction additive was introduced.[Methods]Firstly,the experimental results showed that the typical drag reduction additive was also effective for seawater system ...
Lin Peng, Gao Yimin, Cai Weihua, Chen Yijun, Chen Hongchao   +4 more
doaj   +1 more source

Turbulent drag reduction of a d-type rough wall boundary layer with longitudinal ribs placed with in the grooves. Reduction rate and time mean properties.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1991
In order to control the turbulent energy production and transport processes due to the coherent vortices associated with the bursting phenomenon in a d-type rough wall turbulent boundary layer, longitudinal thin ribs were placed within the transverse grooves with a suitable spanwise spacing.
MOCHIZUKI, Shinsuke, OSAKA, Hideo
openaire   +2 more sources