Koefficijent vosstanovlenija vraščajuščejsja sferičeskoj časticy v židkosti pri udare o ploskost'

0377397 - ÚH 2013 RIV RU rus C - Konferenční příspěvek (zahraniční konf.)
Kvurt, Y. - Keita, Ibrahima - Lukerchenko, Nikolay - Vlasák, Pavel
Koefficijent vosstanovlenija vraščajuščejsja sferičeskoj časticy v židkosti pri udare o ploskost'.
[Restitution coefficient of a spherical particle rotating in liquid at collision with flat wall.]
Matematičeskije metody v technike i technologijach MMTT-25. Vol. Sekcija 34. Volgograd: Volgogradskij gosudarstvennyj techničeskij universitet, 2012 - (Bol'šakov, A.), s. 49-51. ISBN 978-5-7433-2386-9.
[Meždunarodnaja naučnaja konferencija Matematičeskije metody v technike i technologijach /25./. Volgograd (RU), 29.05.2012-31.05.2012]
Grant CEP: GA ČR GA103/09/1718
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: restitution coefficient * rotating spherical particle * flat wall collision
Kód oboru RIV: BK - Mechanika tekutin

V rabote ehksperimental'no byli izucheny processy stolknovenija vrashhajushhikhsja sfericheskikh chastic razlichnykh razmerov i plotnosti (stekljannye, stal'nye i plastikovye shariki diametrom ot 14 do 22 mm) s ploskojj stenojj v dvukh tipakh zhidkosti (voda, silikonovoe maslo). Pri pomoshhi vysokoskorostnojj videosistemy bylo zapisano dvizhenija sharov do i posle stolknovenija. Bylo pokazano, chto koehfficient vosstanovlenija zavisit ot vjazkosti zhidkosti, ot chisla Stoksa shara i ot uglovojj skorosti vrashhenija shara. Koehfficient vosstanovlenija umen'shaetsja s uvelicheniem uglovojj skorosti vrashhenija shara i s umen'sheniem chisla Stoksa. Dlja znachenijj chisla Stoksa bolee 3000 koehfficient vosstanovlenija dostigaet svoego maksimuma.

The collision process of the rotating spherical particle of different size and density (glass, steel, and plastic balls of diameter ranging from 14 to 22 mm) with a flat wall in liquid (water and silicon oil) was studied experimentally. A high-speed video system recorded the particle motion before and after the collision. It was shown that the restitution coefficient depends on the liquid viscosity, particle Stokes number, and on the particle angular velocity. The restitution coefficient decreases with increasing of the particle angular velocity and decreasing of the Stokes number; for the Stokes number values over 3000 the restitution coefficient reaches its maximum.
Trvalý link: http://hdl.handle.net/11104/0209561