This book serves as both a graduate text and a reference for engineers and scientists exploring the theoretical and computational aspects of the fluid dynamics and transport of sprays and droplets‎.‎ Attention is given to the behavior of individual droplets‎,‎ including the effects of forced convection due to relative droplet‎-gas motion‎,‎ Stefan convection due to the vaporization or condensation of the liquid‎,‎ multi‎-component liquids ‎(‎and slurries‎)‎‎,‎ and internal circulation of the liquid‎.‎This second edition contains more information on droplet‎-droplet interactions‎,‎ the use of the mass‎-flux potential‎,‎ conserved scalar variables‎,‎ spatial averaging and the formulation of the multi‎-continua equations‎,‎ the confluence of spatial averaging for sprays and filtering for turbulence‎,‎ direct numerical simulations and large‎-eddy simulations for turbulent sprays‎,‎ and high‎-pressure vaporization processes‎.‎ Two new chapters introduce liquid‎-film vaporization as an alternative to sprays for miniature applications and a review of liquid‎-stream distortion and break‎-up theory‎.‎