• •
收稿日期:
2024-05-26
修回日期:
2024-07-01
出版日期:
2024-07-17
通讯作者:
马学虎
作者简介:
阮达(1994—),男,博士研究生,ruanda1994@mail.dlut.edu.cn
基金资助:
Da RUAN(), Jingjing HOU, Ziyi Bo, Shuaishuai Zhang, Xuehu MA(
)
Received:
2024-05-26
Revised:
2024-07-01
Online:
2024-07-17
Contact:
Xuehu MA
摘要:
微通道中环状流广泛应用于精细化学品合成等领域,而环状流中薄液膜的流动形态及厚度对反应过程的热质传递影响显著,因此实验利用激光诱导荧光法对薄液膜厚度进行精准在线测量。结果表明,随气相剪切力增大,液膜厚度降低,波动形态由低频高振幅波转变为高频低振幅波。二氯甲烷为3 ml/min、含气率为0.7时波动频率最高可达260 Hz。在相同含气率下,液膜形态由流体黏度和表面张力决定,液膜厚度随流体黏度增大而增大,液膜波动频率随表面张力增大而减小。通过薄液膜在微通道内受力分析,构建了不同流体的薄液膜厚度的预测模型,预测值与实验值偏差±15%。本研究明晰了微通道内不同物性液体及气速对液膜波动及厚度的影响,为薄液膜强化热质传递提供理论指导。
中图分类号:
阮达, 侯静静, 薄紫一, 张帅帅, 马学虎. 微通道内环状流薄液膜厚度及波动实验研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240559.
Da RUAN, Jingjing HOU, Ziyi Bo, Shuaishuai Zhang, Xuehu MA. Study of thin liquid film thickness and fluctuation pattern of annular flow in microchannel[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240559.
含气率(x) | 激光强度(%) | ||
---|---|---|---|
水(Water) | 乙醇 (EtOH) | 二氯甲烷 (DCM) | |
0.1 | 35 | 35 | 36 |
0.2 | 35 | 35 | 38 |
0.3 | 38 | 37 | 40 |
0.4 0.5 0.6 0.7 | 38 40 41 41 | 38 40 40 42 | 39 41 43 44 |
表1 不同工况下的实验激光强度
Table 1 Experimental laser intensities under different operating conditions
含气率(x) | 激光强度(%) | ||
---|---|---|---|
水(Water) | 乙醇 (EtOH) | 二氯甲烷 (DCM) | |
0.1 | 35 | 35 | 36 |
0.2 | 35 | 35 | 38 |
0.3 | 38 | 37 | 40 |
0.4 0.5 0.6 0.7 | 38 40 41 41 | 38 40 40 42 | 39 41 43 44 |
名称 | ρ / kg/m3 | μ / μPa s | σ / mN/m |
---|---|---|---|
EtOH | 785 | 1077 | 22.09 |
DCM | 1326 | 413 | 28.16 |
水 | 997 | 912 | 72.18 |
N2 | 1.165 | 17.48 | -- |
表2 测试流体物性
Table 2 Experimental fluid properties
名称 | ρ / kg/m3 | μ / μPa s | σ / mN/m |
---|---|---|---|
EtOH | 785 | 1077 | 22.09 |
DCM | 1326 | 413 | 28.16 |
水 | 997 | 912 | 72.18 |
N2 | 1.165 | 17.48 | -- |
图6 通道顶部及底部的液膜厚度平均值随x的变化(QEtOH= 2 ml/min)
Fig. 6 Mean value of liquid film thickness at the top and bottom of the channel as a function of x (QEtOH = 2 ml/min)
图9 不同流体(水,EtOH,DCM)的液膜波动平均振幅及频率随x的变化注:(Water,EtOH,DCM) as a function of x
Fig. 9 Average amplitude and frequency of liquid film fluctuations of different fluids
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