Effects of the gap size on the flow pattern maps in a mini-gap annular channel

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Author list: Pipathattakul M., Mahian O., Dalkilic A.S., Wongwises S.

Publisher: Elsevier

Publication year: 2014

Journal: Experimental Thermal and Fluid Science (0894-1777)

Volume number: 57

Start page: 420

End page: 424

Number of pages: 5

ISSN: 0894-1777

eISSN: 1879-2286

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903540597&doi=10.1016%2fj.expthermflusci.2014.06.006&partnerID=40&md5=46075e90c0c57da6465a88eb986be02a

Languages: English-Great Britain (EN-GB)

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Abstract

An experimental study has been performed to examine the effects of gap size on the flow pattern maps of air-water two-phase flow inside a mini-gap annular channel with inclination angles (θ) of 0°, 30°, and 60°. The tests are conducted for three different sizes of the inner diameters (Di) of the concentric annular test section-namely 8, 10, and 11. mm-while the outer diameter is equal to 12.5. mm. The flow pattern maps are presented for various types of flow including plug flow, slug flow, annular/slug flow, annular flow, bubbly/plug flow, bubbly/slug-plug flow, churn flow, and dispersed bubbly flow, regarding the alteration of gap sizes and inclination angles. According to the experimental conclusions, the angle of inclination and the various gap sizes are influential in the transition of flow regimes. © 2014 Elsevier Inc.

Keywords

Narrow annular channel