Abstract
The present study involves the experimental and analytical analysis of film formation in liquid–liquid two-phase flow in a mini capillary tube with different wettability. Four glass capillaries are used, one uncoated and three coated to change contact angle. The experiment involves water and toluene flowing from a co-annular inlet in a straight capillary. Water slugs, Toluene slugs, Water droplets, and Toluene droplets are observed depending on the contact angle of the test sections. Weber number based on in-situ slug velocity is estimated analytically to predict film formation around slug for a given contact angle. It is observed that the prediction of the analysed model matches well with the experiment.
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