Results 31 to 40 of about 510,808 (288)

Mechanical Analysis of DS in Horizontal Directional Drilling

Applied Sciences, 2022
In recent years, trenchless horizontal directional drilling (HDD) technology has developed rapidly towards the direction of large pipe diameter and long span. During construction, the buckling deformation and large drag torque of the drillstring (DS) are
Hua Tong, Yongbo Shao
doaj   +1 more source

Static Performance Measurements and Model Predictions of Gas Foil Thrust Bearing with Curved Incline Geometry

Lubricants, 2023
Gas foil thrust bearings (GFTBs) have been successfully used to support the axial load of oil-free microturbomachinery with low drag friction due to the low viscosity of gas or air used as a bearing lubricant.
Sung Ho Hwang, Syed Muntazir Mehdi, Tae Ho Kim   +2 more
doaj   +1 more source

Non-dimensional characteristics of open wet clutches for advanced drag torque and aeration predictions

Tribology International, 2020
The remaining torque of disengaged wet clutches is a major source of energy loss and, therefore, an objective of current research. The present contribution describes the necessary simplifications to obtain an analytical solution of the governing ...
R. Leister, A. Najafi, D. Gatti, J. Kriegseis, B. Frohnapfel   +4 more
semanticscholar   +1 more source

Drag, lift, and torque correlations for axi-symmetric rod-like non-spherical particles in linear wall-bounded shear flow [PDF]

International Journal of Multiphase Flow
This paper presents novel correlations to predict the drag, lift, and torque coefficients of axi-symmetric non-spherical rod-like particles in a wall-bounded linear shear flow.
Victor Ch'eron, B. V. Wachem
semanticscholar   +1 more source

Novel Torque and Drag Model for Drilling Two-Dimensional High-Angle Wells

ACS Omega, 2022
Planning high-angle wells involves diverse areas; one of the most important of these areas is torque and drag (T&D) management. Not only could uncontrolled T&D cause various drilling problems like drill string (D/S) failures, casing wear, stuck pipes ...
Muhammad Nour, A. Elgibaly, M. Farahat, Omar Mahmoud   +3 more
semanticscholar   +1 more source

Torque and Drag Forces Problems in Highly Deviated Oil Well

Iraqi Journal of Chemical and Petroleum Engineering, 2018
Excessive torque and drag can be critical limitation during drilling highly deviated oil wells. Using the modeling is regarded as an invaluable process to assist in well planning and to predict and prevent drilling problems.
Hasan Ali Neamah, Ayad A.Alhaleem A.Alrazzaq   +1 more
doaj   +1 more source

Multi-objective Optimization Design of Wet Friction Clutches

Jixie chuandong, 2023
The drag torque of the wet clutch affects the efficiency of the transmission, and the engagement torque of the clutch affects the reliability of the transmission.
Jiang Kai, Li Hua, Chen Si, Li Shilei, Ren Rongzhi   +4 more
doaj  

Flow structures and wall parameters on rotating riblet disks and their effects on drag reduction

Alexandria Engineering Journal, 2022
The demand of energy saving and loss mitigation in modern industry gives rise to drag reduction techniques such as micro groove/riblet ever since the last century.
Tong Liang, Yang Xu, Jiawen Li, Guobiao Cai   +3 more
doaj   +1 more source

Multi-Objective Optimization of Drilling Trajectory Considering Buckling Risk

Applied Sciences, 2022
Directional drilling involves three sections—vertical, curved, and horizontal—and is used for drilling offshore wells and mining unconventional resources.
Jiho Jeong, Chaeog Lim, Byeong-Cheol Park, Jeonghoon Bae, Sung-chul Shin   +4 more
doaj   +1 more source

Analysis and Suppression Method of Drag Torque in Wide-Speed No-Load Wet Clutch

Actuators
Under no-load conditions, the wet clutch of vehicles generates drag torque across a wide speed range, which increases power loss in the transmission system and significantly impacts its efficiency and reliability.
Rui Liu, Chao Wei, Lei Zhang, Lin Zhang, Siwen Liang, Mao Xue   +5 more
doaj   +1 more source