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International Journal of Chemical Engineering
Volume 2014 (2014), Article ID 358241, 10 pages
http://dx.doi.org/10.1155/2014/358241
Research Article

Experimental Investigation of the Interaction between Rising Bubbles and Swirling Water Flow

1EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
2Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Received 16 August 2013; Accepted 1 November 2013; Published 16 January 2014

Academic Editor: Mostafa Barigou

Copyright © 2014 Tomomi Uchiyama and Shunsuke Sasaki. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study experimentally investigates the interaction between rising bubbles and swirling water flow imposed around the central (vertical) axis of a bubble plume in a cylindrical water tank. Small air bubbles are successively released from the bottom of the tank to generate a bubble plume, and a stirring disc at the bottom of the tank is rotated to impose a swirling water flow around the central axis of the bubble plume. The bubbles disperse further with the increasing rotational speed of the stirring disc. Some bubbles shift toward the central axis of the swirling flow when is high. The nondimensional swirling velocity of water reduces with increasing bubble flow rate when is lower than a certain value. However, it is less affected by the bubbles when is higher. The precessional amplitude for the upper end of the vortex core increases due to the presence of the bubbles. With increasing , the nondimensional precessional velocity decreases, and the bubble effect also reduces.