Visualization study on flow pattern of gas-liquid two-phase flowing through multi-orifice plate in horizontal pipe

doi:10.11949/j.issn.0438-1157.20161726

Abstract

Abstract:

Producing a bubble flow in multi-orifice plate downstream (MOPD) is a basic condition for the exhaust absorber with multi-orifice plates to achieve a satisfied absorption capacity. In this paper, a visualization experiment on the flow pattern of gas-liquid two-phase flowing through a multi-orifice plate in a horizontal pipe was conducted using the air and water as the gas and liquid phase, respectively. Four multi-orifice plates with the orifice diameter of 2, 3, 4 and 5 mm were tested in a horizontal plexiglass pipe with the inner diameter of 98.5 mm by using a high speed camcorder to record the air-water flow, thus the effects of orifice diameter, air flow rate and water flow rate on the flow pattern in the multi-orifice plate downstream were obtained. The results show that the stratified/plug flow transition in MOPD shift to an increased water flow rate while the plug/bubble flow transition shift to a decreased water flow rate in comparison with the flow pattern transition in horizontal pipes. The flow pattern in MOPD is inclined to a bubble flow with the decrease of air flow rate or the increase of water flow rate. Meanwhile, an important dependence on the orifice diameter is found for the flow pattern in MOPD. With the decrease of orifice diameter, the plug/bubble flow transition shift to an increased air flow rate and a decreased water flow rate, meaning that an increased flow range is obtained to form bubble flow. In addition, as the orifice diameter decreasing, the flow pattern in MOPD is inclined to transfer from wavy stratified flow to bubble flow directly without an occurrence of plug flow. To achieve a satisfied flow pattern and absorption capacity for the exhaust absorber with multi-orifice plates, it is recommended to choose the orifice diameter not larger than 3 mm.

Key words: gas-liquid flow, bubble, orifice plate, flow, flow pattern, visualization experiment

摘要：

多孔板后是否形成均匀分散的泡状流流型是影响多孔板废气吸收装置吸收效果的关键因素。以空气和水作为两相介质，对气液两相混合物在水平管内流经多孔板后形成的流型进行实验。通过孔径分别为2、3、4、5 mm的4只多孔板在内径98.5 mm水平有机玻璃管内的可视化流动及高速摄像，研究了孔径大小、气相流量变化及液相流量变化对多孔板后流型的影响规律。实验结果表明：水平管内插入多孔板后，分层/塞状流转变边界向液相流量增大方向推移，塞状/泡状流转变边界向液相流量减小方向推移；随气相流量减小或液相流量增大，多孔板后流型趋于形成泡状流；孔径大小对多孔板后流型具有重要影响，减小孔径使塞状/泡状流转变边界移向更大气相流量和更小液相流量，即形成泡状流的两相流量范围增大；随孔径减小，孔板后流型趋于由分层流直接过渡至泡状流，塞状流趋于消失。为保证多孔板吸收装置的良好流型和吸收效果，建议多孔板孔径不大于3 mm。

关键词: 气液两相流, 气泡, 孔板, 流动, 流型, 可视化实验

CLC Number:

O359⁺.1

PENG Jiewei, MA Youfu, WU Hengliang, LÜ Junfu, LIU Yuan, PENG An, JIAO Qianfeng. Visualization study on flow pattern of gas-liquid two-phase flowing through multi-orifice plate in horizontal pipe[J]. CIESC Journal, 2017, 68(6): 2266-2274.

彭杰伟, 马有福, 吴恒亮, 吕俊复, 刘媛, 彭安, 焦乾峰. 水平管内多孔板后的气液两相流型可视化实验[J]. 化工学报, 2017, 68(6): 2266-2274.

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