Volume 118, Number 4, May 2017
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||24 July 2017|
Walks of bubbles on a hot wire in a liquid bath
GRASP, UR-CESAM - Physics Department B5, University of Liège - B-4000 Liège, Belgium
Received: 15 February 2017
Accepted: 16 June 2017
When a horizontal resistive wire is heated up to the boiling point in a subcooled liquid bath, some vapor bubbles nucleate on its surface. The traditional nucleate boiling theory predicts that bubbles generated from active nucleate sites grow up and depart from the heating surface due to buoyancy and inertia. However, we observed here a different behavior: the bubbles slide along the heated wire. In this situation, unexpected regimes are observed; from the simple sliding motion to bubble clustering. We noticed that bubbles could rapidly change their moving direction and may also interact. Finally, we propose an interpretation for both the attraction between the bubbles and the wire and for the motion of the bubbles on the wire in terms of Marangoni effects.
PACS: 47.55.D- – Drops and bubbles / 47.55.nb – Capillary and thermocapillary flows / 47.55.N- – Interfacial flows
© EPLA, 2017
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