Number of the records: 1

Collision of a Small Rising Bubble with a Large Falling Particle

SYSNO ASEP	0392128
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Collision of a Small Rising Bubble with a Large Falling Particle
Author(s)	Hubička, M. (CZ) Basařová, P. (CZ) Vejražka, Jiří (UCHP-M)_{RID, ORCID, SAI}
Source Title	International Journal of Mineral Processing. - : Elsevier - ISSN 0301-7516 Roč. 121, JUN 10 (2013), s. 21-30
Number of pages	10 s.
Language	eng - English
Country	NL - Netherlands
Keywords	bubble-particle interaction ; collision process ; collision efficiency
Subject RIV	CI - Industrial Chemistry, Chemical Engineering
R&D Projects	GAP101/11/0806 GA ČR - Czech Science Foundation (CSF)
Institutional support	UCHP-M - RVO:67985858
UT WOS	000319545200004
DOI	10.1016/j.minpro.2013.02.013
Annotation	The attachment of bubbles onto a collecting surface plays a critical role in flotation which is utilised for the separation of mineral ores, coal or plastic materials. While mineral flotation deals with fine particles and larger bubbles, this work is focused on the opposite case of an interaction of a single rising bubble (Db b 1 mm)with a larger spherical particle, which falls down through a stagnant liquid. The collision is studied theoretically and experimentally. The theoreticalmodel, based on an analysis of forces acting on the bubble, leads to a differential equation for the bubblemotion. Both themobile and immobile bubble surfaces are considered. The experimental bubble trajectory and velocity evolution are in good agreement with the theoretical model. The horizontal deflection of the bubble trajectory caused by the particle motion is dependent on the ratio of bubble terminal velocity and particle settling velocity. The influence of buoyancy, interception and inertial mechanisms on the collision efficiency is also examined. It is concluded that the buoyancy is the most significant mechanism for the interaction of small bubbles with large particles.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2014

Number of the records: 1