Flow regime transition criteria -- Drag forces -- Friction pressure drop -- Diffusion velocities for algebraic slip models -- Entrainment in annular two-phase flow -- Deposition in annular two-phase flow -- to fragmentation and coalescence -- Acceleration induced droplet and bubble fragmentation -- Turbulence induced particle fragmentation and coalescence -- Liquid and gas jet disintegration -- Fragmentation of melt in coolant -- Nucleation in liquids -- Bubble growth in superheated liquid -- Condensation of a pure steam bubble in a subcooled liquid -- Bubble departure diameter -- How accurately can we predict nucleate boiling? -- Heterogeneous nucleation and flashing in adiabatic pipes -- Boiling of subcooled liquid -- Natural convection film boiling -- Forced convection boiling -- Film boiling on vertical plates and spheres -- Liquid droplets -- Heat and mass transfer at the film-gas interface -- Condensation at cooled walls -- Discrete ordinate method for radiation transport in multi-phase computer codes.Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. In its third extended edition this book contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations. This book provides a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present second volume the mechanical and thermal interactions in multiphase dynamics are provided. This third edition includes various updates, extensions, improvements and corrections.