By G. C. Sih (auth.), Prof. Dr. D. R. Axelrad, Prof. Dr. rer. nat. W. Muschik (eds.)
This quantity comprises the lectures provided on the mini-symposium on "Micromechanics" held at the side of the CSME Mechanical Engineer ing discussion board 1990 among the third and eighth June, 1990 on the collage of Toronto, Canada. The expressed objective of this symposium was once to debate a few contemporary advancements within the Micromechanics of fabrics and the way advert vances during this box now relate to the answer of functional engineer ing difficulties. end result of the cut-off date set for this component to the Engineer ing discussion board in addition to the restrict at the variety of papers to be pre sented, it used to be impossible to hide a much broader diversity of subject matters. How ever, an try out was once made to incorporate an important advances asso ciated with the development made in micromechanics in its program to fabric technological know-how and engineering over the last decade. hence, the themes are serious about: the basic features of the thermodynamics of based solids (part I), - the micromechanical behaviour of alloys (part II), - the modelling of the cloth behaviour at the foundation of continuum idea (part III), and eventually the real new method of the characterization of assorted mate rials and their responses to exterior organisations by way of proba bilistic micromechanics (part IV). we want to take this chance to thank the Chairman of the Organizing Committee, Prof. F. P. J. Rimrott, and the President of the CSME, Prof. T. S.
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Additional info for Recent Developments in Micromechanics: Proceedings of the Mini-Symposium on Micromechanics at the CSME Mechanical Engineering Forum 1990 June 3–9, 1990, University of Toronto, Canada
Evaporation expends latent heat, which must be supplied to the meniscus via the liquid because the heat conductivity of the gas is normally much smaller. The liquid must receive the heat usually by transfer from the solid. Since the latent heat is large, the solid must usually have an external supply of heat. When the process is steady, the temperature is constant in time in most of the solid, and to fix the ideas, suppose first that the solid temperature is also uniform spatially except for local heat sinks at the menisci.
Thermal Balance It is best to start with equilibrium thermodynamics and the time scales then emerging show that this is also sufficient for almost all circumstances. In a wetting liquid, surface tension promotes evaporation, but this Helmholtz phenomenon  is a threshold effect and the threshold lies at radii aM far smaller than occur in typical porous materials. The gas next to the meniscus is therefore at its dew point during evaporation and the temperature is continuous across the meniscus, where it takes its known dew-point value corresponding to the atmospheric gas pressure.
The variety of possible outcomes for different parameter ratios defeats useful predictions in more than quite specific cases. Here is an instance in which a macroscopic, constitutive relation for a porous medium depends on whether the sample is formed more like a sheet or like a ball. In the case of a ball, moreover, the "constants" in such a constitutive relation must be time-dependent in a manner governed by the distance from the outer surface of the sample to which evaporation has progressed.