Two-phase flow regimes in round, square and rectangular tubes during condensation of refrigerant R134a

By J. Coleman, Suresh V. Garimella. 2003

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Effects of channel dimension, heat flux, and mass flux on flow boiling regimes in microchannels (2009, background): “(1974), Taitel and Dukler (1976) for adiabatic two-phase flow in large horizontal channels, Coleman and Garimella (2003) for condensation of R134a in 4.”
Condensation Pressure Drop in Circular Microchannels (2005, background): “For air–water flow [3] as well as the condensation of refrigerants [4] , [5] , it has been demonstrated that flow regimes and transitions in small diameter circular and non-circular geometries are different from those observed in larger diameter circular tubes.”
Condensation Flow Mechanisms in Microchannels: Basis for Pressure Drop and Heat Transfer Models (2004, methodology): “The facility and the experimental procedures are described in greater detail in [ 21–23 ].”
A comprehensive flow regime map for microchannel flow boiling with quantitative transition criteria (2010, result): “The proposed criterion for transition between confi ned and unconfined flow is compared in Figure 5 with available experimental observations from other studies in the literature for water [1, 3, 7, 25-3 1], dielectric liquids [32-35], and refrigerants [36].”