Dynamic coefficient of friction and granular drag force in dense particle flows: Experiments and DEM simulations[J] . Paul A. Moysey,Nadella V. Rama Rao,Malcolm H.I. Baird.Powder Technology . 2013MOYSEY P A,RAO N V R,BAIRD M H I,et al.Dynamic coefficient of friction and granular drag ...
In the equation there are two unknown coefficients (air drag and wheel friction), plus some data describing the body (mass, height) and the environment (air density). A separate computation was done to estimate the area of the body, thus requiring a third coefficient (body area coefficient)...
On the one hand, due to the viscosity of the fluid, frictional forces act on theskin of the body, resulting in a so-calledskin friction drag. The decisive factor here is the shear stress acting on the surface of the body. These shear stresses are also known aswall shear stressesτw. ...
Extended reach well technology represents the most advanced drilling technology in the world nowadays,and the down-hole drag and torque are always being the two key factors which restrict the extension. It is stated herein that the friction coefficient and drag coefficient are two different concepts...
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two-phase flow/ generalized friction factordrag coefficient correlationsfluid-particle interactions/ A4755K Multiphase flowsThe author points out that the paper by Gibilaro et al. (ibid. vol.40, p.1817-1823, 1985) yields results which are almost identical to those he published in the book `...
Here we present a new approach to estimating the drag coefficient of carbonate sands that considers both friction and pressure. Based on our new method, the calculated drag coefficients explain the great variability in settling velocities of carbonate sand observed in nature (from 0.025 m/s to...
Spectrum analysis of the drag forces and coefficient of friction reveal interesting features that vary depending upon rotational speed, pad type, and process downforce. The essential elements of CMP are the polishing pad, the wafer, and the slurry. The friction measurements result from the ...
Wave-Dependence of Friction and Drag Coefficient over Surfaces by Using Velocity, Roughness Length, Coastal and Open Water Three Databases 摩擦速度沿海地区阻力系数粗糙度长度放水空气动力学空气动力粗糙度表面测量摘要:VIP大气科学进展(英文版)
The analysis of skin friction drag is complicated by the process of transition, when the laminar boundary layer becomes turbulent. Consequently, this is called a mixed boundary layer. A realistic drag analysis always assumes a mixed boundary layer. An airfoil that can sustain laminar flow as far...