Specific features of explosive boiling of liquids on a film microheater |
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Authors: | Yu. D. Varlamov Yu. P. Meshcheryakov M. P. Predtechenskii S. I. Lezhnin S. N. Ul’yankin |
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Affiliation: | (1) Kutateladze Institute of Thermophysics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090;(2) Design and Technology Department of the Lavrentyev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 |
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Abstract: | Explosive boiling of liquids on film heaters under the action of pulsed heat fluxes q = 108–109 W/m 2 is considered. A technique of stroboscopic visualization of boiling stages with a time resolution of 100 nsec is used. Numerous scenarios of evolution of explosive boiling are demonstrated. Conditions of the thermal effect (magnitude of the heat flux, duration and repetition frequency of heat pulses) are found, which ensure single and repeated boiling, intermittent boiling, and boiling with formation of complicated multi-bubble structures. It is noted that homogeneous nucleation is a dominating mechanism of incipience of examined liquids for q > 108 W/m 2. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 2, pp. 81–89, March–April, 2007. |
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Keywords: | explosive boiling film heater homogeneous nucleation boiling regimes |
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