Bubble nucleation in an explosive micro-bubble actuator

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Broek van den, D.M. and Elwenspoek, M.C. (2008) Bubble nucleation in an explosive micro-bubble actuator. Journal of Micromechanics and Microengineering, 18 . ISSN 0960-1317

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Abstract:Explosive evaporation occurs when a thin layer of liquid reaches a temperature close to the critical temperature in a very short time. At these temperatures spontaneous nucleation takes place. The nucleated bubbles instantly coalesce forming a vapour film followed by rapid growth due to the pressure impulse. In this paper we take a closer look at the bubble nucleation. The moment of bubble nucleation was determined by both stroboscopic imaging and resistance thermometry. Two nucleation regimes could be distinguished. Several different heater designs were investigated under heat fluxes of hundreds of W mm−2. A close correspondence between current density in the heater and point of nucleation was found. This results in design rules for effective heaters
Item Type:Article
Copyright:© 2009 IOP Publishing
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/62772
Official URL:http://dx.doi.org/10.1088/0960-1317/18/6/064003
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