Model Study on Bubble Slide and Early-Stage Condensation Growth in Rectangular Narrow Channel
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摘要: 矩形窄流道内汽泡生长会直接改变相界面浓度，从而影响流道的传热传质性能。为获得适用于窄流道内不同类型的汽泡生长模型，基于通体可视的实验本体，开展壁面沸腾流动换热实验。基于传热能量方程，研究过冷沸腾中汽泡滑移与冷凝前期两种情况下汽泡生长模型。实验结果表明汽泡呈现两种形式的生长，即汽泡滑移生长以及冷凝前期生长。建立了两种情况下的汽泡生长模型，实验数据验证模型误差在20%以内。因此，本研究能为沸腾两相数值模拟提供更加精细化的汽泡生长模型，从而提高汽泡行为的预测精度。Abstract: Bubble growth in rectangular narrow channel can directly change the phase interfacial area concentration and thus affect the flow channel's heat and mass transfer performance. In order to obtain a model for different types of bubble growth in a narrow flow channel, wall boiling flow heat transfer experiments are carried out based on a through-body visible test section. The bubble growth models are studied for both bubble slide and early-stage condensation conditions in subcooled boiling. The experimental results show that there are two forms of bubble growth, namely, bubble slide growth and early-stage condensation growth. Based on the heat transfer energy equation, the bubble growth models under the two conditions are established, and it is verified through the experimental data that the model error is within 20%. Therefore, this study can provide a more refined model of bubble growth for two-phase numerical simulation of boiling, thus improving the accuracy of bubble behavior prediction.
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图 1 四面可视化沸腾流动实验回路示意图
T—温度传感器；P—压力传感器；ΔP—压差传感器
Figure 1. Schematic Diagram of Four-sided Visualization Boiling Flow Experimental Loop
图 2 四面可视化流动沸腾实验本体
ITO—氧化铟锡
Figure 2. Four-sided Visualization Flow Boiling Test Section
图 3 过冷沸腾汽泡滑移生长尺寸的时间演化
Figure 3. Time Evolution of Bubble Slide Growth Size in Subcooled Boiling
图 4 过冷沸腾中汽泡传热模式
qev,ml—微液层蒸发热流密度
Figure 4. Bubble Heat Transfer Mode in Subcooled Boiling
图 5 不同
$A_{{\text{sll}}}^{^{{\prime}}}$ 与$A_{\text{c}}^{^{{\prime}}}$ 取值下滑移生长模型验证Figure 5. Validation of Slide Growth Model under Different Values of
$A_{{\text{sll}}}^{^{{\prime}}}$ and$A_{\text{c}}^{^{{\prime}}}$ 
图 6 不同工况下滑移汽泡尺寸演化模型验证
Figure 6. Validation of Sliding Bubble Size Evolution Model under Different Working Conditions
图 7 过冷沸腾汽泡冷凝尺寸的时间演化
Figure 7. Time Evolution of Bubble Size during Condensation in Subcooled Boiling
图 8 不同
$A_{{\text{sll}}}^{^{{\prime}}}$ 与$A_{{\text{c}}}^{^{{\prime}}}$ 取值下冷凝前期生长模型验证Figure 8. Validation of Early-Stage Condensation Growth Model under Different Values of
$A_{{\text{sll}}}^{^{{\prime}}}$ and$A_{{\text{c}}}^{^{{\prime}}}$ 
图 9 不同工况下冷凝前期汽泡生长模型验证
Figure 9. Validation of Early-Stage Bubble Condensation Growth Model under Different Working Conditions
表 1 直接测量物理量误差值
Table 1. Error Value of Direct Measurement of Physical Quantity
测量参数 相对误差 流量 ±0.088% 压力 ±0.067% 压差 ±0.067% 温度 ±0.5 K 电源电压 ±0.02% 电源电流 ±0.167% 
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