This book is an expanded form of the monograph, Dropwise Condensation on Inclined Textured Surfaces, Springer, 2013, published earlier by the authors, wherein a mathematical model for dropwise condensation of pure vapor over inclined textured surfaces was presented, followed by simulations and comparison with experiments. The model factored in several details of the overall quasi-cyclic process but approximated those at the scale of individual drops. In the last five years, drop level dynamics over hydrophobic surfaces have been extensively studied. These results can now be incorporated in the dropwise condensation model. The present monograph has been written from this perspective.Dropwise condensation is an efficient route to heat transfer and is often encountered in major power generation applications. Drops are also formed during condensation in distillation devices that work with diverse fluids ranging from water to liquid metals. Design of such equipment requires careful understanding of the condensation cycle, starting from the birth of nuclei, followed by molecular clusters, direct growth of droplets, their coalescence, all the way to instability and fall-off of condensing drops. The model described here considers these individual steps of the condensation cycle. Additional discussions include drop shape determination under static conditions, a fundamental study of drop spreading in sessile and pendant configurations, and the details of the drop coalescence phenomena. These are subsequently incorporated in the condensation model and their consequences are examined. As the mathematical model is spread over multiple scales of length and time, simulation is computationally demanding. A parallelization approach to simulation is presented. Special topics covered in the present book include three-phase contact line modeling, surface preparation techniques, fundamentals of evaporation and evaporation rates of a single liquid drop, and measurement of heat transfer coefficient during large-scale condensation of water vapor.Texts and review articles on dropwise condensation have focused on the phenomenology and reported experimental data. Models reported are primarily heuristic and empirical in nature. We are not aware of any text that describes a unified model of the complete dropwise condensation process of pure vapour over textured surfaces. In this respect, this book explicitly treats drop shapes, drop coalescence, effect of hydrophobicity on transport characteristics, effect of wettability of droplets and the contact angle hysteresis, drop mergers, coalescence, and drop instability, leading to a comprehensive and holistic modeling framework, which includes major intermediate steps of the condensation cycle. The elaborate and generic model allows for progressive improvement and suggests possible experiments needed for validation. We hope that this significantly expanded text meets the expectations of design engineers, analysts, and researchers working in areas related to applications in phase-change phenomena and heat transfer.weiterlesen