The present study investigates the effects of tube roughness and wettability on oil-water flow regimes in mini channels. The tube material examined included borosilicate glass (i.e., e= 0.1 μm) and stainless steel (i.e., e=5 μm). Flow patterns and pressure drop were measured and presented for different combinations of oil and water superficial velocities, 0.28-3.36 m/s and 0.07-5 m/s, respectively. Stratified, annular, intermittent, and dispersed flow regimes were observed in all tubes and between tubes, many similarities in flow regime emerged. Tube wettability affected flow regime and flow transition from stratified to annular and intermittent flows. Surface roughness had an observable effect overall flow regime and particularly on pressure drop measurements as stainless steel recorded higher pressure drops.
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机译：本研究调查了管道的粗糙度和润湿性对微型通道中油水流态的影响。被检查的管材料包括硼硅酸盐玻璃（即，e ＝0.1μm）和不锈钢（即，e ＝5μm）。测量并给出了油和水表观速度的不同组合的流量模式和压降，分别为0.28-3.36 m / s和0.07-5 m / s。在所有管中以及管之间观察到分层，环形，间断和分散的流动状态，在流动状态中出现了许多相似之处。管的可湿性会影响流态和从分层流向环形流和间歇流的过渡。表面粗糙度对整体流动状态有可观察到的影响，特别是在压降测量中，因为不锈钢记录到较高的压降。
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