Abstract
This study experimentally explores the flow around a cylinder with circular cross-section placed inside a bubble plume. Small gas bubbles with diameter smaller than 0.06 mm are released from electrodes on the bottom of a water tank by electrolysis of water. The bubbles induce water flow around them as they rise because of buoyancy. Inside the generated bubble plume, a cylinder with diameter D of 30 mm is placed at 6.5D above the electrodes. The bubbles and water flow around the cylinder are visualized, and the bubble velocity distribution is measured. The experiments elucidate the bubble behavior around the cylinder, the separated shear layers originating at the cylinder surface, their roll-up, the bubble entrainment in the resultant large-scale eddies behind the cylinder, and the vortex shedding from the cylinder.
Highlights
When gas bubbles are successively released into liquid, they rise because of buoyancy with inducing the liquid flow around them
This study experimentally investigates the flow around a cylinder with circular cross-section in bubble plumes induced by small bubbles
The fundamental characteristics of the bubble plume are investigated for this particular experimental setup
Summary
When gas bubbles are successively released into liquid, they rise because of buoyancy with inducing the liquid flow around them. Such bubble-driven flows or bubble plumes are used in various engineering processes that involve matter and heat transfer, mixing, and chemical reactions. Several studies have examined bubble plumes and methods to predict the entrained liquid flow rate [1] [2] and plume characteristics [3] [4]. Methods to simulate bubble plumes have been presented [6]-[10], and they have successfully grasped the bubble movement and the induced eddies having various scales. The author [11] numerically simulated a bubble plume across a staggered tube bundle to
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