Université de Nancy I Laboratoire de Spectroscopie et des Techniques Microondes E.R.A. AU C.N.R.S. nℴ 22, Interactions Moléculaires Boite Postale 239 54506 Vandoeuvre les Nancy Cedex France Boite Postale 239 54506 Vandoeuvre les Nancy Cedex France
Faculté des Sciences Mirande Laboratoire de Recherche sur la Réactivité des Solides Associé au C.N.R.S. B.P. 21004 Dijon Cedex France B.P. 21004 Dijon Cedex France
The evaporation of a polar liquid at low pressure upon exposure to microwave radiation has been investigated. The conventional theories previously developed to describe the non-equilibrium conditions of the evaporating interface are found to be in poor agreement with the experimental results. It is possible to take into account the influence of microwave fields on the evaporating surface by modifying the expression for the entropy production. Another approach, based on the concept that microwaves would increase the pressure, has also been found to be satisfactory.