Study of different-mode-interacting boiling heat transfer characteristics on the heating plate with material cross arrangement

doi:10.11949/0438-1157.20210201

Abstract

Abstract:

Abnormal interference boiling, that is, mutual interference between different boiling intensities or different boiling modes (nucleus state, film state), has been proven to increase the critical heat flux density of boiling heat transfer in a tiny gap. This phenomenon is realized on the nonuniform plate with alternate distribution of high and low conductance materials. The nonuniform plate with material (PTFE) cross arrangement can increase densities of different materials boundaries and enhance the interacting between different boiling intensities or different boiling modes, which is used to improve the boiling heat transfer characteristics in the micro gap. The experimental results show that the boiling heat transfer performance of PTFE cross arrangement is significantly improved compared with uniform copper plates and PTFE parallel arrangement. The material width and gap size have a significant impact on CHF value of the nonuniform plate. As the gap size increases, the CHF shows an increasing trend and the material width corresponding to the maximum CHF decrease. Under the optimal combination of material width and gap size, the maximum CHF can reach 1140 kW/m² and the highest ratio of CHF enhancement is 84%.

Key words: heat transfer, interface, bubble, different-mode-interacting boiling, cross arrangement

摘要：

异态干涉沸腾，即不同沸腾强度或者不同沸腾模式（核态、膜态）之间相互干涉，被证实可以提升微小间隙内沸腾传热临界热通量。该现象是在填充了低热导率材料的传热块表面发生的。低热导率材料（PTFE）交错分布结构能够增加不同材料交界面的密度且增强不同沸腾强度或者不同沸腾模式的相互干涉，故被应用于提升微小间隙内的沸腾传热特性。实验结果表明：与均匀传热板和PTFE平行分布传热板相比，PTFE交错分布传热板表面的沸腾传热性能显著提升。材料宽度和间隙尺寸对非均匀板表面的沸腾CHF产生明显影响，随着间隙尺寸的增加，CHF呈上升趋势且最大CHF对应的材料宽度减小。在最优的材料宽度和间隙尺寸的组合下，最大的临界热通量可达到1140 kW/m²且最高的CHF提升比例为84%。

关键词: 传热, 界面, 气泡, 异态干涉沸腾, 交错分布

CLC Number:

TK 124

Lulu MENG, Tianxi XIE, Zhihao CHEN, Yoshi UTAKA. Study of different-mode-interacting boiling heat transfer characteristics on the heating plate with material cross arrangement[J]. CIESC Journal, 2021, 72(9): 4564-4572.

孟璐璐, 谢添玺, 陈志豪, 宇高義郎. 材料交错分布型传热板表面异态干涉沸腾传热特性研究[J]. 化工学报, 2021, 72(9): 4564-4572.

Figures/Tables 8

Fig.1 The structure of the nonuniform heating plate

Table 1 Specification of heat transfer plates

传热块类别	材料节距P/mm	低热导率材料宽度W_L/mm	高热导率材料宽度W_H/mm	δ/mm	δ_s/mm
PTFE平行分布	1.0	0.5	0.5	0.5	0.3
	2.0	1.0	1.0	0.5	0.3
	4.0	2.0	2.0	0.5	0.3
PTFE交错分布	1.0	0.3	0.7	0.5	0.3
	2.0	0.6	1.4	0.5	0.3
	4.0	1.2	2.8	0.5	0.3

Fig.2 Schematic of the experimental system

Fig.3 Effect of PTFE arrangement on the boiling characteristic

Fig.4 Effect of the material width on boiling characteristic

Fig.5 Effect of the gap size on boiling characteristic

Fig.6 Variation of CHF with the gap size

Fig.7 Variation of CHF enhancement with gap size

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