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HIGH-SPEED VISUALIZATION OF TRAJECTORY AND SHAPE CHANGE OF VAPOR BUBBLE IN SUBCOOLED FLOW BOILING

卷 34, 册 4, 2022, pp. 15-40
DOI: 10.1615/MultScienTechn.2022042685
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摘要

In this work, we report our experiments of capturing the shape change, spiral and spinning motion, and trajectory of the vapor bubbles rising in subcooled boiling flow in a vertically heated channel of natural circulation boiling loop using a high-speed video camera at 500 fps. We have measured bubble diameter, velocity, and trajectory of the moving vapor bubble at various surface temperatures and degrees of subcooling. The measured bubble diameter, velocity, and trajectory are in good agreement with the existing theories. The trajectories of the moving bubbles in subcooled flow boiling have been analyzed experimentally and numerically. We have observed an irregular shape change of the bubble during its motion in subcooled liquid and a spiral-spinning trajectory of the nonspherical bubbles in close-to-saturation boiling at higher heat fluxes. The nonspherical bubbles lend a path instability of spiralling-and-zigzag trajectories and rotations (spinning) of the bubbles because of the coupling effect of the hydrodynamic forces and torques generated by the oscillating liquid flow surrounding the bubble. This is also confirmed by a periodic variation of the bubble velocity. The aspect ratios of the vapor bubble, as the shape changes during its rise, are satisfactory experimentally and theoretically, and are comparable with the captured bubble images.

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