Phase change involves two phases in a single component, whereas general two-phase flows can be adiabatic with multiple phases. One phase can be air and the other can be water. Two-phase flows are used in a wide range of industrial applications such as atmospheric sciences, biological sciences, and heat transfer processes. In heat transfer, the main focus is on phase change that involves two distinct phases in a single component. Therefore, typically this kind of phenomenon is applied in electronic cooling, where microchannels and minichannels are used to increase the heat transfer rate. The fundamental advantage of two-phase flow boiling is that the two-phase heat transfer coefficient is three to four orders of magnitude higher than the single-phase heat transfer coefficient.