%0 Journal Article %A Madhavan, Aravind Krishna %A Hegde, Karki Divya Sree %A Madhurima, Kothakota %A Venkatesan, Muniyandi %D 2018 %I Begell House %K slug, multiphase flow, mini-channel, image processing %N 1 %P 1-11 %R 10.1615/IntJEnergeticMaterialsChemProp.2018026083 %T TWO-PHASE FLOW BEHAVIOR IN A CONVERGENT−DIVERGENT MINI-CHANNEL NOZZLE %U https://www.dl.begellhouse.com/journals/17bbb47e377ce023,6b3bf3d631e49e83,2a778d456743cbb8.html %V 17 %X Multiphase flows occur more commonly than single-phase flows in natural and technological processes. In this work, an experimental analysis is done to understand the two-phase flow behavior of air–water mixture in a convergent divergent mini-channel nozzles using high-speed image processing. Air–water Taylor bubble flow is generated in a circular mini-channel terminating with a convergent divergent nozzle. The channel is 79.5 mm long with an inlet diameter measuring 3 mm. The throat to inlet ratio of the nozzle is 0.43:1. The behavior of air slugs when passed through the nozzle is photographed using a high-speed complementary metal-oxide semiconductor (CMOS) sensor-equipped camera. MATLAB Image Processing Toolbox is utilized to make dimensional measurements of the slug for numerical validation. The study is extended by developing a numerical model using COMSOL Multiphysics for multiple nozzle dimensions to observe the variation in slug behavior with respect to nozzle geometry. The surface tension at the slug–nozzle wall interface plays a key role in the process of slug separation resulting in bubbles post the nozzle. The variation in density of the multiphase flow with respect to time is analyzed from the computational solution and its implications are discussed. %8 2018-08-10