Flow Pattern Map of Flow Boiling in a Rectangular Channel Filled with Porous Media

Youngwoo Kim, Dae Yeon Kim and Kyung Chun Kim
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Youngwoo Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Dae Yeon Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Kyung Chun Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2021, vol. 14, issue 9, 1-13

Abstract: A flow visualization study was carried out for flow boiling in a rectangular channel filled with and without metallic random porous media. Four main flow patterns are observed as intermittent slug-churn flow, churn-annular flow, annular-mist flow, and mist flow regimes. These flow patterns are clearly classified based on the high-speed images of the channel flow. The results of the flow pattern map according to the mass flow rate were presented using saturation temperatures and the materials of porous media as variables. As the saturation temperatures increased, the annular-mist flow regime occupied a larger area than the lower saturation temperatures condition. Therefore, the churn flow regime is narrower, and the slug flow more quickly turns to annular flow with the increasing vapor quality. The pattern map is not significantly affected by the materials of porous media.

Keywords: visualization; metallic random porous media; flow patterns; vapor quality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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