[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.1016/j.net.2020.05.025

Experimental study of bubble flow behavior during flow instability under uniform and non-uniform transverse heat distribution

Al-Yahia, Omar S. (Emirates Nuclear Technology Center, Khalifa University of Science and Technology)
Yoon, Ho Joon (Emirates Nuclear Technology Center, Khalifa University of Science and Technology)
Jo, Daeseong (School of Mechanical Engineering, Kyungpook National University)

Publication Information

Nuclear Engineering and Technology / v.52, no.12, 2020 , pp. 2771-2788 More about this Journal

Abstract

Experiments are conducted to study bubble flow behavior during the instability of subcooled boiling under uniform and non-uniform transverse heating. The non-uniform heat distribution introduces nonuniform bubble generation and condensation rates on the heated surface, which is different from the uniform heating. These bubble generation and condensation characteristics introduce a non-uniform local pressure distribution in the transverse direction, which creates an extra non-uniform pressure on the flowing bubbles. Therefore, different bubble flow behavior can be observed between uniform and non-uniform heating conditions. In the uniform heating, bubble velocity fluctuations are low, and the bubbles travel straight along the axial direction. In the non-uniform heating, more fluctuation in the bubble velocity occurs at low mass flow rate and high subcooled inlet temperatures, and reverse flow is observed. Additionally, the bubbles show a zigzag trajectory when they pass through the channel, which indicates the existence of cross flow in the transverse direction.

Keywords

Bubble flow behavior; Subcooled flow instability; Non-uniform heat distribution; Narrow rectangular channel;

Citations & Related Records

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