Experimental study on boiling dynamics modulation by porous foam deaeration board

doi:10.11949/0438-1157.20220939

Abstract

Abstract:

Deaeration boards (DBs) with different hydrophobicity were prepared and suspended over the monocrystalline silicon surfaces. The effects of DB on the boiling bubble dynamics were systematically investigated through high-speed video. The size evolution of boiling bubbles during the growth and departure stages was monitored. The results show that both the height and wettability of DB have important effects on the dynamic characteristics of boiling bubbles. When the height is less than the maximum growth height, the DB forces the bubble departure and reduces the maximum bubble departure diameter. When the contact angle of DB is 150°, the deaeration effect is the best, and the departure stage can be shortened to 3 ms, and the instantaneous deaeration rate can reach 5.46 mm³/ms, which is 3.96 times that on the surface with the wetting contact angle at 100°. The coupled control of the deaeration height, wettability and the microstructure of the heat exchange surface of the deaeration board can jointly realize the early intervention of the bubble growth stage and the forced promotion of the detachment stage, so as to truly realize the full enhancement of the boiling dynamics.

Key words: nucleate boiling, deaeration board, bubble dynamics, whole process enhancement, wettability

摘要：

利用不同的改性方法对多孔泡沫铜表面进行浸润性改性处理，并制备了一系列具有不同疏水性的吸气板，系统研究了悬挂吸气板对沸腾单气泡生长、脱离阶段的影响。结果表明，不同吸气高度和吸气浸润性均对沸腾气泡动力学特性具有重要影响。当吸气高度小于气泡最大生长高度时，吸气板可实现强制气泡脱离并有效减小气泡最大脱离直径。当吸气板表面浸润角为150°时，吸气效果最佳，最短可将脱离阶段缩短至3 ms，最大瞬时吸气速率可达5.46 mm³/ms，为浸润角是100°吸气板吸气速率的3.96倍。耦合控制吸气板的吸气高度、浸润性和换热表面的微结构可共同实现对气泡生长阶段的提前干预和对脱离阶段的强制促进，真正实现沸腾动力学的全程强化。

关键词: 核态沸腾, 吸气板, 气泡动力学, 全程强化, 浸润性

CLC Number:

TK 121

Yiran WANG, Chaoyang GUAN, Xiang GAO, Hongxia CHEN. Experimental study on boiling dynamics modulation by porous foam deaeration board[J]. CIESC Journal, 2022, 73(11): 4948-4956.

王逸然, 关朝阳, 高翔, 陈宏霞. 多孔泡沫吸气板调控沸腾气泡动力学实验研究[J]. 化工学报, 2022, 73(11): 4948-4956.

Figures/Tables 10

Fig.1 Schematic diagram of experimental system

Fig.2 Copper foam before and after modification

Fig.3 Evolution of bubble behavior at different deaeration heights

Fig.4 Size change curves of single bubble at different deaeration heights

Fig.5 Change of bubble equivalent diameter with time with or without the deaeration board

Fig.6 Images of different deaerating processes on various deaeration wettability

Fig.7 Instantaneous deaerating rates on deaeration board with different wettability

Fig.8 The evolution curves of single bubble size under different wettability deaeration

Fig.9 The evolution curves of single bubble size under different heat flux

Table 1 Strengthening factors at different heat fluxes

q/(kW/m²)	$ζ g$		$ζ d$		$ζ w$
q/(kW/m²)	h=2.27 mm	h=1.74 mm	h=2.27 mm	h=1.74 mm	h=2.27 mm	h=1.74 mm
87.1	1.53	1.87	1.81	1.92	1.58	1.88
95.8	1.52	1.85	1.83	1.91	1.58	1.86
107.2	1.49	1.83	1.88	1.92	1.58	1.83

Table 1 Strengthening factors at different heat fluxes

q/(kW/m²)	$ζ g$		$ζ d$		$ζ w$
q/(kW/m²)	h=2.27 mm	h=1.74 mm	h=2.27 mm	h=1.74 mm	h=2.27 mm	h=1.74 mm
87.1	1.53	1.87	1.81	1.92	1.58	1.88
95.8	1.52	1.85	1.83	1.91	1.58	1.86
107.2	1.49	1.83	1.88	1.92	1.58	1.83

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