Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle

doi:10.1016/j.cjche.2018.08.022

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (1): 63-71.DOI: 10.1016/j.cjche.2018.08.022

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle

Jin Zhao, Zhi Ning, Ming Lü, Geng Wang

College of Mechanical and Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

收稿日期:2018-01-24 修回日期:2018-05-03 出版日期:2019-01-28 发布日期:2019-01-31
通讯作者: Zhi Ning
作者简介:Jin Zhao,E-mail addresses:15121365@bjtu.edu.cn;Ming Lü,E-mail addresses:lvming@bjtu.edu.cn;Geng Wang,E-mail addresses:15121355@bjtu.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (51776016, 51606006), Beijing Natural Science Foundation (3172025, 3182030), National Key Research and Development Program (2017YFB0103401), National Engineering Laboratory for Mobile Source Emission Control Technology (NELMS2017A10), and the Talents Foundation of Beijing Jiaotong University (2018RC017).

Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle

Jin Zhao, Zhi Ning, Ming Lü, Geng Wang

College of Mechanical and Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Received:2018-01-24 Revised:2018-05-03 Online:2019-01-28 Published:2019-01-31
Contact: Zhi Ning
Supported by:
Supported by the National Natural Science Foundation of China (51776016, 51606006), Beijing Natural Science Foundation (3172025, 3182030), National Key Research and Development Program (2017YFB0103401), National Engineering Laboratory for Mobile Source Emission Control Technology (NELMS2017A10), and the Talents Foundation of Beijing Jiaotong University (2018RC017).

摘要/Abstract

摘要： The flow focusing nozzle is a new type of nozzle that performs effective atomization of the discrete phase by means of high-speed motion of the continuous phase. The flow pattern and its morphological changes have a significant effect on the atomization, but the influence of different parameters on the morphological change of the flow pattern remains unclear. The flow focusing pattern and morphological changes in the two-phase flow inside the nozzle were simulated numerically, based on the volume of fluid method. The results demonstrate that the ratio of the nozzle-to-capillary distance and capillary diameter, the gas-liquid velocity ratio, and capillary diameter have significant effects on the flow pattern. When the ratio of the nozzle-to-capillary distance H and capillary diameter D increases, or the capillary diameter D increases, the flow pattern tends to transform into a laminar form; however, when the gas-liquid velocity ratio V increases, the flow pattern tends to transform into a turbulence form. Furthermore, we define the cone-shaped expansion rate, cone-shaped focusing rate, and cone angle in order to study the morphological changes in the cone shape inside the nozzle. The results indicate that the morphological change of the cone shape and flow pattern transformation is interrelated. When the cone shape tends to be unstable, the flow pattern changes towards flow blurring, whereas, a stable cone indicates that the flow tends to exhibit a droplet pattern.

关键词: Flow focusing, Pattern transformation, Morphological changes, Numerical simulation

Abstract: The flow focusing nozzle is a new type of nozzle that performs effective atomization of the discrete phase by means of high-speed motion of the continuous phase. The flow pattern and its morphological changes have a significant effect on the atomization, but the influence of different parameters on the morphological change of the flow pattern remains unclear. The flow focusing pattern and morphological changes in the two-phase flow inside the nozzle were simulated numerically, based on the volume of fluid method. The results demonstrate that the ratio of the nozzle-to-capillary distance and capillary diameter, the gas-liquid velocity ratio, and capillary diameter have significant effects on the flow pattern. When the ratio of the nozzle-to-capillary distance H and capillary diameter D increases, or the capillary diameter D increases, the flow pattern tends to transform into a laminar form; however, when the gas-liquid velocity ratio V increases, the flow pattern tends to transform into a turbulence form. Furthermore, we define the cone-shaped expansion rate, cone-shaped focusing rate, and cone angle in order to study the morphological changes in the cone shape inside the nozzle. The results indicate that the morphological change of the cone shape and flow pattern transformation is interrelated. When the cone shape tends to be unstable, the flow pattern changes towards flow blurring, whereas, a stable cone indicates that the flow tends to exhibit a droplet pattern.

Key words: Flow focusing, Pattern transformation, Morphological changes, Numerical simulation

Jin Zhao, Zhi Ning, Ming Lü, Geng Wang. Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle[J]. Chinese Journal of Chemical Engineering, 2019, 27(1): 63-71.

Jin Zhao, Zhi Ning, Ming Lü, Geng Wang. Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle[J]. Chin.J.Chem.Eng., 2019, 27(1): 63-71.

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Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle

Numerical simulation of flow focusing pattern and morphological changes in two-phase flow inside nozzle

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