Investigation of droplet deposition on a plate with two-phase flow separation at the leading edge

1988 ◽  
Vol 54 (6) ◽  
pp. 615-619
Author(s):  
O. M. Khmara ◽  
S. V. Ryzhkov
Keyword(s):  
Flow Separation ◽  
Two Phase Flow ◽  
Leading Edge ◽  
Phase Flow ◽  
Droplet Deposition ◽  
Two Phase

scholarly journals Slug catcher finger-type CFD simulator for two-phase flow separation

Petroleum ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 133-140
Author(s):  
Alessio Pierro ◽  
Simone Spadoni ◽  
Francesco Chiappetta ◽  
Francesco Ferrini
Keyword(s):  
Flow Separation ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

scholarly journals Numerical and Experimental Study of Hydraulic Performance and Wear Characteristics of a Slurry Pump

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 373
Author(s):  
Guangjie Peng ◽  
Long Tian ◽  
Hao Chang ◽  
Shiming Hong ◽  
Daoxing Ye ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Hydraulic Performance ◽  
Cover Plate ◽  
Phase Flow ◽  
Two Phase ◽  
Wear Characteristics ◽  
Solid Liquid ◽  
Blade Leading Edge

The slurry pump is widely used in ore mining, metal smelting, petrochemical, and other industries, mainly to transport fluid media containing large solid particles. Importantly, it is easy to damage the impeller of a slurry pump in the operation process, which greatly affects the performance of the pump. In this paper, a 25 MZ slurry pump was selected as the research object, and the Euler–Euler multiphase flow model was employed to analyze the internal flow characteristics of the slurry pump under the conditions of clear water and solid–liquid two-phase flow. Additionally, the flow characteristics of each part under different flow conditions were studied, and the effects of different particle volume concentrations, particle sizes, and pump speeds on the impeller’s wear characteristics and hydraulic performance were analyzed. In order to verify the reliability and accuracy of the numerical simulation results, clean water and solid–liquid two-phase flow wear tests of the slurry pump were carried out, and the results showed that a high solid volume fraction and solid–phase slip velocity were generated at the junction of the blade leading edge and the rear cover plate, thus leading to easier wear of the blade. Therefore, enhancing the strength of the junction between the blade leading edge and the rear cover plate is beneficial for improving service life and should be considered in the design of slurry pumps.

scholarly journals Horizontal Liquid Film-mist Two-phase Flow : 2nd Report, Droplet deposition and entertainment rates

1985 ◽  
Vol 28 (236) ◽  
pp. 301-308
Author(s):  
Koji AKAGAWA ◽  
Terushige FUJII ◽  
Junichi ITO ◽  
Yukio HAMANO ◽  
Takahiro HORIUCHI
Keyword(s):  
Liquid Film ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Droplet Deposition ◽  
Two Phase

ICONE19-43772 DROPLET DEPOSITION RATE IN VERTICAL ANNULAR TWO-PHASE FLOW

2011 ◽  
Vol 2011.19 (0) ◽  
pp. _ICONE1943-_ICONE1943
Author(s):  
Michitsugu Mori ◽  
Pravin Sawant ◽  
Yang Liu ◽  
Mamoru Ishii
Keyword(s):  
Deposition Rate ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Droplet Deposition ◽  
Two Phase

Time-Average Drag Coefficient and Void Fraction in Gas-Liquid Two Phase Flow

2009 ◽  
Author(s):  
S. Ghanbarzadeh ◽  
P. Hanafizadeh ◽  
M. H. Saidi
Keyword(s):  
Reynolds Number ◽  
Drag Coefficient ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Leading Edge ◽  
Phase Flow ◽  
Two Phase ◽  
Processing Scheme ◽  
Time Average

Two-phase flow simulations around a body were not studied before and considering these flows can play a significant role in long-term reliability and safety of industrial systems. In this paper, flow regimes, drag coefficient and void fraction around different cross-section prisms were considered. To achieve this aim, main equations of flow have been developed for investigation of drag coefficient in air-water two phase. Our numerical analyses were performed by a designed and written CFD package which is based on Eulerian-Eulerian approach. Geometries, which have been studied in this article, are: circle, rectangle and triangle, for different aspect ratio (length over width) and leading edge angle, respectively. Other parameters such as two phase Reynolds number, free stream void fraction and bubble size were considered, too. Drag coefficient is closely related to the turbulence and the bubble motion. Since these mechanisms vary over time, we used the time-average value of drag coefficient. Furthermore, some attempts were done to investigate flow field, void fraction distribution and especially wake region around the cylinders by an image processing scheme in an upward air-water bubbly flow. The results showed that drag coefficient strongly dependent upon Reynolds number. Numerical results were compared with available empirical correlations and experimental works of Yokosawa et al [1].

Effect of Obstacle Shape on the Deposition Rate in Annular Two-Phase Flow

2006 ◽  
Author(s):  
Takayuki Fujita ◽  
Jun Minamitani ◽  
Tomio Okawa ◽  
Isao Kataoka
Keyword(s):  
Liquid Film ◽  
Deposition Rate ◽  
Test Section ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Droplet Deposition ◽  
Round Tube ◽  
Two Phase ◽  
Obstacle Effect ◽  
Obstacle Geometry

In annular two-phase flow, it is known that the deposition rate of droplets markedly increases if an obstacle is placed in a flow channel. In most of the available models to evaluate the obstacle effect on deposition rate, turbulence augmentation at the downstream of obstacle is considered as the key mechanism of the deposition enhancement. In this study, it was examined where the increase of droplet deposition occurred around the obstacle to reveal the primary cause of deposition enhancement. The test section was a round tube of 5 mm in inside diameter and air and water were used as test fluids; the double film extraction technique was adopted to measure the deposition rate. To specify the position where the deposition enhancement occurred, the liquid film was extracted at the upstream, middle and downstream of the flow obstacle. As a result, it was indicated that the significant amount of droplets was deposited not only at the downstream of flow obstacle but also at the upstream of obstacle. Using five tubular obstacles of different inside and outside diameters, the influence of obstacle geometry on the deposition rate was investigated. It was shown that the position of deposition enhancement was influenced significantly by the obstacle geometry.

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