年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
ONSET OF ATOMIZATION ON HORIZONTAL, SHEAR-DRIVEN LIQUID FILMS AT THE VICINITY OF A SHARP CORNER
要約
In many engineering applications, the liquid films have to deal with sudden changes of the wall geometries in which they flow over. The present work concerns the study of the onset of the film atomization in corner geometries. Specifically, films with thickness in the range of 1 mm < hf < 2.5 mm and dimensionless scale parameters in the range of 2 < ε · Ref < 24, able to expand in a spanwise direction without side restrictions, are developed on a horizontal plate. The films approach a sharp corner of 90° at the end of the plate under the shearing action of an external airflow. The air velocity and the liquid flow rate in which the film atomization at the corner edge initiates are detected experimentally. The behavior of the mean film and its waves at the corner are studied under those conditions. Both the viscosity and the surface tension are varied to investigate the effect of the liquid properties on the onset of the film atomization. The experimental data obtained here are compared extensively with the atomization models found in the open literature. The comparison shows that the existing models are not able to predict the onset of atomization for the films of the current work. That happens mainly because the interfacial waves have been totally neglected from the models. Further theoretical development is required to successfully predict the initiation of the droplet generation in corner geometries.
-
Bacharoudis Evangelos, Bratec Hervé, Keirsbulck Laurent, Buchlin Jean-Marie, Labraga Larbi, Simplified model for the prediction of the occurrence of film atomization in corner geometries, International Journal of Multiphase Flow, 58, 2014. Crossref
-
Zhang Yanzhi, Jia Ming, Duan Huiquan, Wang Pengfei, Wang Jiangxiang, Liu Hong, Xie Maozhao, Numerical and experimental study of spray impingement and liquid film separation during the spray/wall interaction at expanding corners, International Journal of Multiphase Flow, 107, 2018. Crossref
-
Sadeghizadeh Zahra, Drallmeier James A., Effect of liquid viscosity and surface tension on mass separation of shear-driven liquid film at a sharp corner, International Journal of Multiphase Flow, 111, 2019. Crossref
-
Wang Bo, Tian Ruifeng, Study on characteristics of water film breakdown on the corrugated plate wall under the horizontal shear of airflow, Nuclear Engineering and Design, 343, 2019. Crossref
-
Wang Bo, Tian Ruifeng, Judgement of critical state of water film rupture on corrugated plate wall based on SIFT feature selection algorithm and SVM classification method, Nuclear Engineering and Design, 347, 2019. Crossref
-
Wang Bo, Chen Bowen, Tian Ruifeng, Review of research progress on flow and rupture characteristics of liquid film on corrugated plate wall, Annals of Nuclear Energy, 132, 2019. Crossref
-
Sadeghizadeh Zahra, Drallmeier James A., Effect of Large Amplitude Waves and Film Inertia on Mass Separation at a Sharp Corner, Journal of Fluids Engineering, 140, 8, 2018. Crossref
-
Wang Bo, Chen Bowen, Li Ru, Tian Ruifeng, Study on fracture morphology of water film on the wall of vertical corrugated plate under shear of the air flow, Annals of Nuclear Energy, 136, 2020. Crossref