Results 261 to 270 of about 556,138 (304)

High-resolution 3D CFD multiphase simulation of the flow and the drag torque of wet clutch discs considering free surfaces

Tribology International, 2019
The viscous shearing of the cooling oil within disengaged wet clutches causes a substantial amount of power loss. In order to optimise efficiency, it is the objective of current research to minimise these losses to a great extent. In addition to test rig
T. Neupert, D. Bartel
semanticscholar   +1 more source

Direct numerical simulation of the drag, lift, and torque coefficients of high aspect ratio biomass cylindrical particles

The Physics of Fluids
Biomass straw fuel has the advantage of low-carbon sustainability, and therefore, it has been widely used in recent years in coupled blending combustion with coal-fired utility boilers for power generation.
Jingliang Wang, Lun Ma, Maoqiang Jiang, Qingyan Fang, Chungen Yin, Peng Tan, Cheng Zhang, Gang Chen   +7 more
semanticscholar   +1 more source

Simulation Research on the Drag Torque of Disengaged Wet Clutches

2019 IEEE 5th International Conference on Mechatronics System and Robots (ICMSR), 2019
In order to evaluate the drag torque of wet clutches in high speed zone, a gas-fluid two phases mathematical model was established with grooves in consideration based on the theory of viscous fluid dynamics.
Ha Pan, Xiaojun Zhou
semanticscholar   +1 more source

Torque and Drag Modeling for Horizontal Openhole Completions

SPE Annual Technical Conference and Exhibition, 2005
Proposal Since horizontal openhole sections are now being drilled to lengths that exceed 20,000 ft, placement of the completion string (CS) to planned total depth (TD) may not be possible under a proposed drilling plan. During the early years of horizontal-well construction, the hanging weight of the completion string was usually ...
R. Rezvani, B. Techentien
openaire   +1 more source

Torque and Drag Modeling Advanced Techniques and Troubleshooting

SPE Annual Technical Conference and Exhibition, 2012
Abstract Extreme torque and drag (T&D), especially when unplanned, is a primary limiter to the reach of horizontal and extended-reach wells. Many engineers use T&D software models without a thorough understanding of how the input affects the calculations in the program.
John McCormick, Gefei Liu
openaire   +1 more source

Dynamic Torque and Drag Model Coupled With Transient Hydraulic

Volume 9: Offshore Geotechnics; Petroleum Technology, 2023
Abstract A drill-string is an extremely slender mechanical structure and consequently it can oscillate very easily. Drill-string vibrations during drilling operations is the source of many drilling dysfunctions such as decreased drilling performance, damage to downhole equipment, or formation instabilities.
Eric Cayeux, Espen Jettestuen, Adrian Ambrus   +2 more
openaire   +1 more source

Model for the prediction of drag torque characteristics in wet clutch with radial grooves

Proceedings of the Institution of mechanical engineers. Part D, journal of automobile engineering, 2018
Drag torque can cut down the efficiency of the vehicle transmission system. So it should be reduced on the premise of normal vehicle lubrication and heat dissipation.
Lin Zhang, Chao Wei, J. Hu
semanticscholar   +1 more source

Modeling of the drag torque of the disengaged grooved wet clutches with waviness

Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, 2018
It is seen that the relative motion between the friction and separate plates causes drag torque of the disengaged wet clutch, which reduces the efficiency of the automatic transmission.
Yanzhong Wang, Shao-fei Ren, Yuan Li
semanticscholar   +1 more source

AIRCRAFT ACCESSORY DRAG TORQUE DURING ENGINE STARTS

2017
<div class="section abstract"> <div class="htmlview paragraph">This SAE Aerospace Information Report (AIR) presents a discussion of drag torques of engine accessories operating at cold temperature. Various conditions of temperature, speed, and acceleration rates are reviewed showing the merits of each method and recommending a standard ...
openaire   +2 more sources

Designing Well Paths to Reduce Drag and Torque

SPE Drilling Engineering, 1987
Summary A deviated well with an undersection trajectory (i.e., a trajectory lying below the conventional tangent section and constantly building to target) can exhibit lower drag and torque than a conventional well geometry in certain circumstances. The influence of well geometry on drag and torque is discussed, making use of the results
M. C. Sheppard, C. Wick, T. Burgess
openaire   +1 more source