Transition of Oscillatory Marangoni Convection in Low Prandtl Number Liquid Bridge

摘要

An experimental study on thermocapillary convection of low Prandtl number fluid was carried out to estimate the mode structure after the onset of oscillatory flow. The half-zone liquid bridge of molten tin was used as a experimental configuration. In order to detect very slight temperature changes, the temperature measurement system was improved. Temperature oscillations at the interface between liquid and cold rod were obtained by several thermocouples. The critical Marangoni number was 64 in case of aspect ratio of 2.1. Transition process after the onset of oscillation was analyzed. During several transitions, intermittency were detected with increasing Marangoni number. Chaotic flow appeared in larger Marangoni number (Ma > 200).