The Investigation of the Bubble Behaviors on the Vertical Heat Exchange Tube

Yongsheng Tian, Pengfei Xu, Linhua Zhang and Luopeng Yang ()
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Yongsheng Tian: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Pengfei Xu: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Linhua Zhang: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Luopeng Yang: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China

Energies, 2022, vol. 15, issue 19, 1-15

Abstract: In the boiling process, the growth, separation, and movement of bubbles are expeditious. The visualization experiment of nucleate boiling was carried out with the help of high-speed photography. The evolution of the entire bubble life cycle is clearly observed at the nucleation site without interference from the leading and neighboring bubbles. Bubble behavior at the local heating surface has strong randomness due to the influence of the wall micro-structure, convection intensity, heating surface geometry configuration, heat flux density, and so on, but bubble behavior also has a certain regularity. In this paper, the behavior characteristics of bubbles were analyzed, with a particular focus on the evolution of bubbles. Under lower load (Δ T sat = 8~9 °C) in study conditions, nucleation sites have a long enough time interval. In addition, the bubble separation and rising velocity obviously increase due to the change of pool boiling flow characteristics in the restricted space. The setting of confined space increases the bubble escape velocity and the rising velocity, and decreases the diameter of bubbles escaping from the wall. The results will provide some help for the understanding of bubble behavior mechanisms and numerical research.

Keywords: pool boiling; bubble behaviors; vertical heating tube; visual experiment (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: 2022
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