ABSTRACT
This chapter introduces the physical phenomena related to vacuum bubbling. Solubility and vapor pressure are two important physical properties that govern the formation of bubbles. Approaches based on thermodynamics to more effectively generate bubbles, especially vapor bubbles, are reviewed. Vapor bubbles, like high-temperature steam, have a dissolved oxygen concentration close to zero, so applying them to the degassing process is expected to help solve many current technical problems, including energy consumption. For the high level of deaeration required by the industry, it is necessary to review important variables based on the understanding of the generation and behavior of vapor bubbles, and four performance variables are presented for this purpose. Results obtained through theoretical review and experimentation will also be useful in creating reliable predictive tools. Above all, the principle of mass evaporation for desalination is introduced as a challenging application field. Degassing and desalination are not separate but interrelated applications, and concepts are introduced to better understand them.
