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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2018026083
pages 1-11

TWO-PHASE FLOW BEHAVIOR IN A CONVERGENT−DIVERGENT MINI-CHANNEL NOZZLE

Aravind Krishna Madhavan
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India
Karki Divya Sree Hegde
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India
Kothakota Madhurima
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India
Muniyandi Venkatesan
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India

RÉSUMÉ

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.


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