A IUTAM symposium on 'Waves in Liquid/Gas and Liquid/Vapor Two-Phase Systems' was held in Kyoto, Japan, 9-13 May 1994. Sixty-three scientists partici pated coming from ten countries, and forty-two lectures were presented. The list of participants and the program are included in this volume. The symposium was held in response to the request of the participants in the IUTAM symposium 'Adiabatic Waves in Liquid-Vapor System' held at Gottingen in 1989. At that time, the need for another symposium in about five years had been indicated by all the participants. This symposium intends to develop the subject of wave properties in more general liquid-gas two-phase systems. Topics in this symposium may be classified as (1) waves in liquid-gas bubble systems including interfacial effects, (2) waves in gas( vapor )-droplets systems, (3) waves in films or stratified systems, (4) waves with liquid-vapor transition, (5) waves with vapor-liquid transition, (6) wave propagation near the critical point and (7) waves with low pressure effect. As for topic (1), experiments, numerical simulations and analytical approaches to waves in bubly liquids were discussed. The importance of interbubble interactions through the liquid-field is now well established at least in terms of potential theory. There was also a progress concerning the well-posedness of governing equations for void waves. For pressure waves there were some new phenomena, such as bubble cluster formation and the occurrence of three-dimensional structures, in addition to a progress from more qualitative studies to quantitative ones.

Zusammenfassung
Proceedings of the IUTAM Symposium held in Kyoto, Japan, 9--13 May 1994

Inhalt
(1) Waves in liquid-gas bubble systems including interfacial effects.- Void waves.- Structure and stability of void waves in bubbly flows.- Void and pressure waves in slug flow.- Behavior of void wave on the basis of turbulent liquid-bubbles two-phase flow model.- Acoustic waves.- Linear waves in bubbly liquids.- Surface oscillations of mutually-interacting gas bubbles in a sound field.- On waves of the self-induced acoustic transparency in mixtures of liquid and vapor bubbles.- Pressure waves in bubbly liquids.- Pressure waves in two-phase bubble/slug flows and interphase process.- Structure of shock waves in a liquid containing gas bubbles.- High-frequency nonlinear waves in bubbly liquid.- Numerical simulations and kinetic theory for simple shear motion of bubbly suspensions.- Bouncing and coalescence of two bubbles in pure water.- Interaction of an underwater shock wave with a gas bubble.- (2) Waves in gas(vapor)-droplets systems.- Wave phenomena during droplet impact.- Maximum pressures during hypervelocity liquid-liquid impact.- On travelling waves in two-phase systems.- (3) Waves in film or stratified systems.- Chaotic behavior of waves in two-phase system.- Evolution of time periodic perturbations on films falling down walls.- Thermal control of interfacial instabilities in multilayer thin-film flows.- Hydrodynamic stability of liquid films.- Interfacial wave structure and its effect on transport phenomena in horizontal wavy/annular two-phase flows.- Pressure wave propagation in a separated liquid-gas layer in a horizontal duct.- (4) Waves in liquid-vapor transition.- Dynamics of a single reactive gas bubble.- Stability and nonequilibrium phase transitions in boiling-up systems.- On the perturbations of evaporation waves and liquefaction shocks.- Explosive boiling of a depressurized volatile liquid.- Propagation of waves in a vapor-gas mixture due to evaporation and condensation.- Observations of explosive exsolution in liquids.- (5) Waves with vapor-liquid transition.- Film condensation of the vapor flow behind a shock wave on the shock-tube side wall.- Experiments of vapor-liquid phase transition in a shock-tube.- Theoretical investigation of condensation dynamics in shock tubes.- New modes of periodic shock formation in compressible two-phase flows.- (6) Wave propagation near critical point.- Adiabatic waves in the neighbourhood of the critical point.- Material waves of a fluid in the vicinity of the critical point.- A model of a plug-chain system near the thermodynamic critical point: connection with the Korteweg theory of capillarity and modulation equations.- (7) Waves with low pressure effect.- Behaviour of a liquid under dynamic loading.