ABSTRACT
In this chapter, boiling, condensation, and associated two-phase flows are presented. Different modes of pool boiling include nucleate and film pool boiling. Forced convection boiling is considered for external flow over a flat plate, outside a horizontal tube, and other surface configurations. Two-phase flow in vertical tubes is examined for various flow regimes. The process of bubble formation and models of annular flow are described. The flow regimes are also examined in horizontal tubes, including dispersed bubble flow, stratified flow, and correlations for plug and annular flows. An introduction to turbulence modeling of two-phase flows is presented. Laminar and turbulent film condensation on axisymmetric bodies and other configurations are examined. For forced convection condensation, inside and outside tubes, relevant correlations and analysis are introduced. Two-phase heat transfer devices, particularly thermosyphons and heat pipes, are investigated and their transport processes and operational limitations are discussed.
