Dynamic characteristics of boiling bubbles under transient oscillating heating conditions

doi:10.16085/j.issn.1000-6613.2024-0143

Abstract

Abstract:

During the nucleate boiling process, the continuous disturbance of bubbles enhances heat transfer efficiency in the fluid domain. However, the influence of the dynamic characteristics of boiling bubbles on boiling heat transfer still needs to be further clarified at periodic thermal oscillation conditions. A visualisation experiment was used to verify the accuracy of lattice Boltzmann boiling simulation. Based on the multi-relaxation time lattice Boltzmann model, the effects of boiling bubble internal flow field on nucleation, growth, and detachment processes under different pulse conditions were investigated. The bubble motions under constant heating and pulse heating conditions were compared, and the influence of different pulse periods and amplitudes on the bubble internal temperature field was discussed. The results indicated that with an increase of pulse period and amplitude, a reverse vortex opposite to the growth direction appeared inside the bubble, and the stable growth stage and necking-detachment stage gradually advanced. The bubble heat exchange increased, leading to an accelerated bubble growth rate under pulse heating conditions. This article provided a theoretical basis for the investigation of the dynamic characteristics and control of boiling bubbles.

Key words: bubble, two-phase flow, numerical simulation, boiling heat transfer, square wave pulse heating

摘要：

核态沸腾过程中气泡持续扰动流体域增强换热效率，但在周期性热振荡条件下沸腾气泡的运动规律对沸腾传热的影响仍需进一步明确。利用可视化实验验证格子Boltzmann沸腾仿真模拟的准确性。基于多松弛因子格子Boltzmann模型研究不同脉冲条件下沸腾气泡内部流场对其成核、生长和脱离过程的影响，对比恒定加热与脉冲加热条件下的气泡运动差异，讨论不同脉冲周期、脉冲振幅对气泡内部温度场的影响。结果表明，随着脉冲周期和振幅的增大，气泡内部出现与生长拉伸方向相反的逆向涡流，稳定生长阶段和颈缩脱离阶段逐渐提前。脉冲加热条件下气泡内外热交换量增大，气泡生长速度加快。本文得到的结论可以为研究沸腾气泡运动特性及气泡调控提供理论基础。

关键词: 气泡, 两相流, 数值模拟, 沸腾传热, 方波脉冲加热

CLC Number:

TK124

LI Haoyang, LI Hongwei, TAN Jianyu. Dynamic characteristics of boiling bubbles under transient oscillating heating conditions[J]. Chemical Industry and Engineering Progress, 2025, 44(2): 735-742.

李昊阳, 李洪伟, 谭建宇. 瞬态振荡加热条件下沸腾气泡运动特性[J]. 化工进展, 2025, 44(2): 735-742.

Figures/Tables 11

参数	格子单位	物理单位
c_v	6	5.31kJ/(kg·K)
g	0.00003	9.8m/s²
T_s	0.0941	556.55K
T_c	0.1094	647.15K
$ρ_{_{L}}$	6.5	774.29kg/m³
$ρ_{_{V}}$	0.38	35.06kg/m³
l₀	21.778	1.62×10^-3m
$δ_{x}$	1	7.43×10^-5m
$δ_{t}$	1	1.5×10^-5s

参数	格子单位	物理单位
c_v	6	5.31kJ/(kg·K)
g	0.00003	9.8m/s²
T_s	0.0941	556.55K
T_c	0.1094	647.15K
$ρ_{_{L}}$	6.5	774.29kg/m³
$ρ_{_{V}}$	0.38	35.06kg/m³
l₀	21.778	1.62×10^-3m
$δ_{x}$	1	7.43×10^-5m
$δ_{t}$	1	1.5×10^-5s

加热条件	初始成核阶段/%	稳定生长阶段/%	颈缩脱离阶段/%
恒定加热	23.52	47.06	29.42
A=0.2T_c，t_T=50	24.09	36.15	39.76
A=0.4T_c，t_T=50	25.64	25.64	48.72
A=0.6T_c，t_T=50	0.00	40.00	60.00
A=0.8T_c，t_T=50	0.00	40.00	60.00

加热条件	初始成核阶段	稳定生长阶段	颈缩脱离阶段
恒定加热	0.0175	0.0240	0.0179
A=0.2T_c，t_T=50	0.0235	0.0290	0.0241
A=0.4T_c，t_T=50	0.0300	0.0342	0.0297
A=0.6T_c，t_T=50	—	0.0378	0.0367
A=0.8T_c，t_T=50	—	0.0444	0.0441

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