Bunsen反应产物在微通道中的液-液两相混合特性

doi:10.11949/0438-1157.20240918

化工学报 ›› 2025, Vol. 76 ›› Issue (2): 623-636.DOI: 10.11949/0438-1157.20240918

• 流体力学与传递现象 • 上一篇

Bunsen反应产物在微通道中的液-液两相混合特性

张珂¹(), 任维杰¹, 王梦娜¹, 范凯锋², 常丽萍², 李佳斌³, 马涛¹, 田晋平¹

^1.太原科技大学环境与资源学院，山西太原 030024
^2.太原理工大学省部共建煤基能源清洁高效利用国家重点实验室，山西太原 030024
^3.北京市科学技术研究院资源环境研究所，北京 100089

收稿日期:2024-08-12 修回日期:2024-09-24 出版日期:2025-03-25 发布日期:2025-03-10
通讯作者: 张珂
作者简介:张珂（1988—），男，博士，副教授，2019016@tyust.edu.cn
基金资助:
山西回国留学人员科研资助项目(2022-164);山西省专利转化计划项目(202405016);山西省高等学校科技创新项目(2022P007);太原科技大学研究生联合培养示范基地项目(JD2022017)

Liquid-liquid mixing characteristics of Bunsen reaction products in microchannels

Ke ZHANG¹(), Weijie REN¹, Mengna WANG¹, Kaifeng FAN², Liping CHANG², Jiabin LI³, Tao MA¹, Jinping TIAN¹

^1.College of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China
^2.State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
^3.Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing 100089, China

Received:2024-08-12 Revised:2024-09-24 Online:2025-03-25 Published:2025-03-10
Contact: Ke ZHANG

摘要/Abstract

摘要：

为了解决热化学硫碘循环和硫化氢化学反应循环制氢的关键技术问题，提出使用ANSYS-FLUENT对Bunsen反应产物（HI/H₂SO₄/H₂O/甲苯液-液两相混合物）在微通道内的流动混合特性进行数值模拟研究。系统分析了微通道内两相混合与入口方式、入口流速、两相流速比的关系，探讨了微通道内加入障碍物后对两相混合的强化作用。结果表明，当两相以上下分层方式进入通道时，混合效果更佳；提高流速可以显著增大两相流的混合程度，但是通道压力损失随之增加；两相流速比为1∶1、流速为0.035 m/s时，混合程度达到最大值88.72%，同时压力损失相对较小；在通道内部设置障碍物可以形成周期性的涡流，有效缩短两相混合时间，强化两相混合。与半圆形障碍物相比，矩形障碍物可以更有效地促进两相混合，但是压力损失更大。

关键词: 热化学循环制氢, Bunsen反应产物, 两相流, 混合, 微通道, 数值模拟

Abstract:

In order to solve the key technical problems of the thermochemical sulfur-iodine (S-I) cycle and the H₂S splitting cycle for hydrogen production, the mixing characteristics of the Bunsen reaction products (HI/H₂SO₄/H₂O/toluene liquid-liquid two-phase mixture) in the microchannel were investigated by numerical simulation using ANSYS-FLUENT. The relationship between the two-phase mixing in the microchannel and the inlet mode, inlet flow rate, and two-phase flow rate ratio was systematically analyzed, and the strengthening effect of adding obstacles in the microchannel on the two-phase mixing was discussed. The results show that the mixing is more effective when two phases enter the channel in an upper and lower stratified manner. Increasing the flow rates of two phases can significantly increase the mixing degree but the channel pressure loss increases accordingly. When the two-phase flow rate ratio is 1∶1 and the flow rate is 0.035 m/s, the mixing degree reaches the maximum value of 88.72% while the pressure loss is relatively low. Setting obstacles inside the channel can form periodic eddy currents, which can effectively shorten the two-phase mixing time and strengthen the two-phase mixing. Compared to semicircular barriers, rectangular barriers provide a greater promotion of mixing but have a greater pressure loss.

Key words: thermochemical cycle for hydrogen production, Bunsen reaction products, two-phase flow, mixing, microchannels, numerical simulation

中图分类号:

TQ 027.1

张珂, 任维杰, 王梦娜, 范凯锋, 常丽萍, 李佳斌, 马涛, 田晋平. Bunsen反应产物在微通道中的液-液两相混合特性[J]. 化工学报, 2025, 76(2): 623-636.

Ke ZHANG, Weijie REN, Mengna WANG, Kaifeng FAN, Liping CHANG, Jiabin LI, Tao MA, Jinping TIAN. Liquid-liquid mixing characteristics of Bunsen reaction products in microchannels[J]. CIESC Journal, 2025, 76(2): 623-636.

图/表 28

图1 蛇形微通道3D结构示意图

Fig.1 3D structure of the serpentine microchannel

表1 两相物性参数

Table 1 Two-phase physical property parameters

液相	密度/(kg/m³)	动力黏度/(Pa·s)	表面张力/(mN/m)
HI/H₂SO₄混酸	1080.3	9.067×10^-4	28.9
甲苯	860.4	5.345×10^-4	55.4

图2 实验装置示意图

Fig.2 Schematic diagram of the experimental setup

表2 模拟条件

Table 2 Simulation conditions

边界条件	边界类型/名称	参数设置
入口	平均速度入口	0.014 m/s
出口	自由出流出口	0 Pa
壁面	无滑移壁面	—
对称轴	AXIS	—

表3 网格尺寸选择

Table 3 Mesh size

网格划分方案	全局网格尺寸	网格单元数/个
方案1	0.35	1433700
方案2	0.4	948300
方案3	0.5	487872
方案4	0.6	278620
方案5	0.8	149523

图3 通道网格示意图

Fig.3 Grid diagram of the channel

图4 网格数量对混合程度的影响

Fig.4 Effect of mesh number on the mixing degree

图5 不同时间步长对混合程度的影响

Fig.5 Effect of different time steps on the mixing degree

图6 模拟与验证实验流型对比

Fig.6 Comparison of the flow patterns in the simulation and the validation experiment

图7 方案1通道内两相体积占比云图

Fig.7 Cloud images of two-phase volume proportion in the channel of solution 1

图8 方案2通道内两相体积占比云图

Fig.8 Cloud images of two-phase volume fraction distribution of solution 2

图9 两种不同入口方式下混合程度变化

Fig.9 Variations of the mixing effect at different entry modes

图10 通道内流体的压力分布云图

Fig.10 Cloud images of pressure distribution of fluid in channel

表4 两种入口方式下通道的压力损失

Table 4 Pressure losses of the channel at different inlet modes

方案类型	压力损失/Pa
方案1	174.28
方案2	166.52

图11 混合程度随流速比值的变化

Fig.11 Variations of the mixing effect at different velocity ratios

图12 混合程度随两相流速的变化

Fig.12 Variations of the mixing degree at different flow rates of two phases

表5 不同流速时通道的压力损失

Table 5 Pressure losses of the channelat different flow rates

流速/(m/s)	压力损失/Pa
0.014	172.85
0.035	296.53
0.070	498.26
0.140	1087.72
1.400	29786.82

表6 不同流速比时通道的压力损失

Table 6 Pressure losses of the channel at different flow ratios

两相流速比	两相流速/(m/s)		压力损失/Pa
两相流速比	甲苯	混酸	压力损失/Pa
1∶3	0.014	0.042	285.69
1∶2	0.014	0.028	215.36
1∶1	0.014	0.014	142.29
1∶0.5	0.014	0.007	53.94

图13 矩形障碍物参数示意图

Fig.13 Parameter diagram of rectangular obstacle

图14 不同障碍物高度下两相体积占比云图与速度流线图（Ⅰ: H=1 mm; Ⅱ: H=2 mm; Ⅲ: H=2.5 mm）

Fig.14 Cloud images of two-phase volume ratio and velocity flow diagrams at different obstacle heights (Ⅰ: H=1 mm; Ⅱ: H=2 mm; Ⅲ: H=2.5 mm)

表7 不同障碍物高度下的混合程度和压力损失

Table 7 Mixing degrees and pressure losses at different obstacle heights

障碍物高度/mm	混合程度/%	压力损失/Pa
1	90.22	81.14
2	97.41	89.23
2.5	99.85	157.16

图15 不同障碍物宽度下两相体积占比云图与速度流线图（Ⅰ: W=1 mm; Ⅱ: W=2 mm; Ⅲ: W=3 mm）

Fig.15 Cloud images of two-phase volume ratio and velocity flow diagrams at different obstacle widths (Ⅰ: W=1 mm; Ⅱ: W=2 mm; Ⅲ: W=3 mm)

表8 不同障碍物宽度下的混合程度和压力损失

Table 8 Mixing degrees and pressure losses at different obstacle widths

障碍物宽度/mm	混合程度/%	压力损失/Pa
1	97.28	89.15
2	97.41	90.57
3	97.46	93.26

图16 不同障碍物间距下两相体积占比云图与速度流线图（Ⅰ: D=4 mm; Ⅱ: D=6 mm; Ⅲ: D=8 mm）

Fig.16 Cloud images of two-phase volume ratio and velocity flow diagrams at different obstacle separation distances (Ⅰ: D=4 mm; Ⅱ: D=6 mm; Ⅲ D=8 mm)

表9 不同障碍物间距下的混合程度和压力损失

Table 9 Mixing degrees and pressure losses at different obstacle separation distances

障碍物间距/mm	混合程度/%	压力损失/Pa
4	98.62	99.40
6	97.41	89.52
8	96.29	87.11

图17 半圆形障碍物布局图

Fig.17 Semicircular obstruction layout diagram

图18 不同半圆形障碍物半径下的两相体积占比云图与速度流线图（Ⅰ: R=1 mm; Ⅱ: R=2 mm; Ⅲ: R=2.5 mm）

Fig.18 Cloud images of two-phase volume ratio and velocity flow diagrams at different semicircular obstacle radius (Ⅰ: R=1 mm; Ⅱ: R=2 mm; Ⅲ: R=2.5 mm)

表10 不同半圆形障碍物半径下的混合程度和压力损失

Table 10 Mixing degrees and pressure losses at different semicircular obstacle radius

半圆形障碍物半径/mm	混合程度/%	压力损失/Pa
1	89.40	81.12
2	95.84	83.32
2.5	97.68	94.22

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Bunsen反应产物在微通道中的液-液两相混合特性

Liquid-liquid mixing characteristics of Bunsen reaction products in microchannels

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