Comparative Study of Size Effect of Micro Bubble Dynamics by Sub-100 Microsecond and Millisecond Pulse Heating

Two groups of boiling patterns generated by a set of different sizes of micro bubble actuators were observed using new stroboscopic video microscopy. Above the critical heater size, bubble collapse as an oblate vapor film; while the other case, single spherical bubble was observed. The critical size...

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Hauptverfasser:	Pak Kin Leung, Peigang Deng, Yi-Kuen Lee
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	Actuators boiling pattern bubble dynamics Heat engines homogeneous boiling micro bubble actuator Microelectromechanical devices Micropumps Microscopy Predictive models Pulse generation size effect Space vector pulse width modulation Systems engineering and theory Water heating
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Beschreibung
Zusammenfassung:	Two groups of boiling patterns generated by a set of different sizes of micro bubble actuators were observed using new stroboscopic video microscopy. Above the critical heater size, bubble collapse as an oblate vapor film; while the other case, single spherical bubble was observed. The critical sizes are 1-3 mum and 5-10 mum for the heating pulse widths of 40 mus and 1.66 ms, respectively. A simple model based on thermal diffusion length was successfully employed to predict the critical size of bubble actuators
DOI:	10.1109/NEMS.2006.334832