每年出版 4 期
ISSN 打印: 2151-7975
ISSN 在线: 2151-7991
FLUID FLOW AND HEAT TRANSFER WITH PHASE CHANGE IN MINI- AND MICROCHANNELS
摘要
The heat pipe and microchannel heat sink are high-performance heat transmission devices with an extremely high thermal conductivity which strongly depends on the two-phase flow heat transfer. The regularities of capillary hydrodynamics and heat transfer during flow boiling, evaporation, and condensation in mini- and microchannels of rectangular cross section, resulting from experimental and theoretical studies, are discussed in this paper. The patterns of the two-phase gas–liquid flow and capillarity-induced liquid flow distribution along the channel perimeter are presented for different channel orientations. The influence of forced convection, nucleate boiling, and thin film evaporation on the microscale flow boiling heat transfer in mini- and microchannels is reviewed and analyzed based on experimental data. The evaporation and condensation heat transfer model for a curved liquid microfilm in microchannels and rivulet flow on a hot surface are developed and discussed. New methods for calculating the heat transfer with flow boiling and condensation, including the phenomena of nucleate boiling suppression and heat transfer enhancement during evaporation of an extremely thin liquid film, are presented.