Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthday Hydrodynamics and mass transfer of both gas-liquid and liquid-liquid Taylor flow simulation in microchannels are reviewed. Theoretical approaches for description of hydrodynamic parameters and mass transfer characteristics are corroborated by comparison with available experimental results. Similarities and peculiarities of liquid-liquid flows versus gas-liquid Taylor flows in capillaries are discussed. Tools of mass transfer intensification of gas-liquid and liquid-liquid Taylor flow in microchannels are analyzed and optimal process conditions for gas-liquid Taylor flows are evaluated.
An evaporation-deposition coating method for coating the inner surface of long (>1 m) quartz tubes of small diameter has been studied by the introduction of two-phase (gas-liquid) flow with the gas core flowing in the middle and a thin liquid film of synthesis sol flowing near the hot tube wall. The operational window for the deposition of continuous titania coatings has been obtained. The temperature range for the deposition of continuous titania coatings is limited to 105–120 °C and the gas flow rate is limited to the range of 0.4–1.0 L min−1. The liquid flow rate in the annular flow regime allows to control the coating thickness between 3 and 10 micron and the coating porosity between 10% and 20%. By increasing the liquid flow rate, the coating porosity can be substantially reduced. The coatings were characterized by X-ray diffraction, N2 chemisorption, thermogravimetric analysis, and scanning electron microscopy. The coatings were tested in the photocatalytic decomposition of methylene blue and rhodamine B under UV-light and their activity was similar to that of a commercial P25 titania catalyst.
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