Results 231 to 240 of about 376,515 (294)

Research Progress Perspectives of Functional Superslippery Coatings with Drag Reduction for Petroleum Pipeline Transportation. [PDF]

ACS Omega
Zhang J, Zhang S, Wang T, Wang L, Cheng Y.   +4 more
europepmc   +1 more source

Attonewton Force Resolution Measurements with Silicon Nanospheres at the Thermal Noise Limit in Ambient-Temperature Liquids. [PDF]

Nano Lett
Kostarev A, Abdosamadi MK, Sugimoto H, Fujii M, Jannasch A, Schäffer E.   +5 more
europepmc   +1 more source

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Ion Drag Force in Collisional Plasmas

IEEE Transactions on Plasma Science, 2009
A simple hydrodynamic model is used to calculate the ion drag force acting on a small grain in highly collisional weakly anisotropic plasma. First, it is shown that as long as the grain does not absorb ions on its surface, the result from this model coincides with the highly collisional limit of the more general kinetic approach proposed by Ivlev et al.
Khrapak, S., Chaudhuri, M., Morfill, G.
openaire   +2 more sources

Ion drag force in complex plasmas

Physical Review E, 2002
The problem of calculating the ion drag force in complex plasmas is considered. It is shown that the standard theory of Coulomb scattering usually fails for the ion-dust elastic collisions. A simple approach to extend this theory is proposed. This leads to a considerable enhancement in the ion-dust elastic scattering cross section and, hence, increases
Khrapak, S., Ivlev, A., Morfill, G., Thomas, H.   +3 more
openaire   +3 more sources

Drag-force regimes in granular impact

Physical Review E, 2014
We study the penetration dynamics of a projectile incident normally on a substrate comprising of smaller granular particles in three-dimensions using the discrete element method. Scaling of the penetration depth is consistent with experimental observations for small velocity impacts.
Mukesh, Tiwari, T R Krishna, Mohan, Surajit, Sen   +2 more
openaire   +2 more sources

Drag forces of porous-medium acoustics

Physical Review B, 1993
The drag forces controlling the amount of relative flow induced in a fluid-saturated porous material by a mechanical wave are modeled here from first principles. Specifically, analytical expressions for the drag are derived for material models that possess variable-width pores; i.e., pores that have widths that vary with distance along their axis.
, Pride, , Morgan, , Gangi
openaire   +2 more sources

Drag force and clustering in bubble swarms

AIChE Journal, 2012
In this article, results of detailed numerical simulations are reported meant to provide a closure relation for the drag force acting on bubbles rising in a dense swarm. The formation of clusters of bubbles in a periodic domain and the effect thereof on the rise velocity and effective drag coefficient on the bubbles are studied.
Roghair, I., Sint Annaland, van, M., Kuipers, J.A.M.   +2 more
openaire   +1 more source

Nonlinear drag force in dusty plasmas

Physics of Plasmas, 2005
The condition for large angle scattering in ion-grain collisions, which determine the nonlinear part of the ion drag force, coincides with the condition for the grain screening to be nonlinear (∣eϕ∣∕Ti>1 where ϕ is the electrostatic grain potential and Ti is the ion mean energy), a condition met in many laboratory experiments.
V. N. TSYTOVICH, DE ANGELIS, UMBERTO, A. V. IVLEV, G. E. MORFILL, S. A. KHRAPAK   +4 more
openaire   +3 more sources

Drag Force, Drag Torque, and Magnus Force Coefficients of Rotating Spherical Particle Moving in Fluid

Particulate Science and Technology, 2012
The mutual influence of translational and rotational spherical particle movements in calm water was studied using experimental data and numerical simulation. Spherical balls with a density close to that of water were speeded up in special devices, which ensured the required ball rotational and translational velocity in the given plane.
Lukerchenko, N. (Nikolay), Kvurt, Y., Keita, I. (Ibrahima), Chára, Z. (Zdeněk), Vlasák, P. (Pavel)   +4 more
openaire   +2 more sources