Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	An Original Way to Select and Control Hydrodynamic Instabilities: Microwave Heating. Part IV: Energy Consideration and Electric Field Effects [PDF]
AUTHORS	D. Stuerga, and M. Lallemant 1994 29 1 20-30
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Abstract The purpose of this work is the comparison between hydrodynamic behaviors observed during water and ethanol evaporation induced by microwave heating and simultaneously under reduced pressure, in order to generalize the specificity of the microwave heating in relation to thermal dependency. Modeling of microwave heating for the case of a liquid column is described. Thermal dependency of the electric field is taken into account. This model owing to fluid properties makes it possible to obtain changes of the thermal spatial profile. Numerical data, according to experimental results, proves that for liquids as water with dielectric loss decreasing with temperature, thermal conversion of the electromagnetic energy is preponderant in cold areas. For liquids as ethanol with dielectric loss increasing with temperature, thermal conversion of the electromagnetic energy is preponderant in hot areas. Thus, hydrodynamic instabilities selection results from the thermal dependency of the dielectric loss. Conclusions about superheating, boiling, and explosion occurring in microwave heating of liquids are given. Key Words: Microwave heating, Electric field. Thermal feedback, Explosions.