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Microchannels have increasingly been used to miniaturize heat transferequipment, improve energy efficiency, and minimize heat transfer fluidinventory. A fundamental understanding of condensation in microscale will yieldfar-reaching benefits for the different areas of industry. In this study,microtubes with inner diameters of 250, 500, 600, and 900 um were used toinvestigate the effect of microtube diameter, inlet quality, and mass flux onthe liquid/vapor interface near the wall boundaries in condensing flow. Aftervalidation with the experimental results, a transient numerical model (based onthe volume of fluid approach) was developed to investigate the hydrothermalproperties of condensing such as bubble dynamics, flow map transitions,transient interface shear force, and temperature on flow condensationperformance in terms of heat transfer coefficient and pressure drop. The liquidfilm thickness, slug velocity, and location of transition from annular flow toslug flow inside the microtube were characterized for different microtubes, andthe resultant alteration in condensation flow heat transfer and pressure dropis discussed in detail. The obtained results indicated that the interfacialcharacteristics of condensing flow in microtubes with hydraulic diameters lowerthan 500um are majorly different from those with D>500um.

Parametric study on hydrothermal properties of condensing flow in microtube heat exchangers using numerical and experimental approaches