scholarly journals Two-phase flow patterns in turbulent flow through a dose diffusion pipe

2005 ◽  
Vol 235 (9) ◽  
pp. 1001-1014
Author(s):  
H. Tang ◽  
L.C. Wrobel ◽  
I.E. Barton
Keyword(s):  
Turbulent Flow ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through

scholarly journals Periodic Trends in Two-Phase Flow Through a Vertical Minichannel: Wavelet and Multiscale Entropy Analyses Based on Digital Camera Data

2019 ◽  
Vol 13 (1) ◽  
pp. 51-56
Author(s):  
Grzegorz Górski ◽  
Grzegorz Litak ◽  
Romuald Mosdorf ◽  
Andrzej Rysak
Keyword(s):  
Water Flow ◽  
Two Phase Flow ◽  
Digital Camera ◽  
Flow Patterns ◽  
Multiscale Entropy ◽  
Phase Flow ◽  
Periodic Patterns ◽  
Two Phase ◽  
Periodic Sequences ◽  
Flow Through

Abstract By changing the air and water flow relative rates in the two-phase (air-water) flow through a minichannel, we observe aggregation and partitioning of air bubbles and slugs of different sizes. An air bubble arrangement, which show non-periodic and periodic patterns. The spatiotemporal behaviour was recorded by a digital camera. Multiscale entropy analysis is a method of measuring the time series complexity. The main aim of the paper was testing the possibility of implementation of multiscale entropy for two-phase flow patterns classification. For better understanding, the dynamics of the two-phase flow patterns inside the minichannel histograms and wavelet methods were also used. In particular, we found a clear distinction between bubbles and slugs formations in terms of multiscale entropy. On the other hand, the intermediate region was effected by appearance of both forms in non-periodic and periodic sequences. The preliminary results were confirmed by using histograms and wavelets.

scholarly journals Two-phase flow patterns in adiabatic refrigerant flow through capillary tubes

2020 ◽  
Vol 115 ◽  
pp. 107-116 ◽  
Author(s):  
Luka Lorbek ◽  
Anja Kuhelj ◽  
Matevž Dular ◽  
Andrej Kitanovski
Keyword(s):  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Capillary Tubes ◽  
Two Phase ◽  
Flow Through

Investigation on Air-Water Two-Phase Flow in Downward Minichannel

2014 ◽  
Author(s):  
Hemant B. Mehta ◽  
Jyotirmay Banerjee
Keyword(s):  
Flow Pattern ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Experimental Investigations ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through

Experimental investigations are reported for gas-liquid two-phase flow through 2.15 mm circular minichannel. Influence of premixing of air-water two-phase flow through T-junction (TJ) and Y-junction (YJ) geometries is established. Vertical downward orientation (VDW) is selected for the experiments. Different flow patterns are observed and flow pattern maps are developed. The developed flow pattern maps are then compared with available literature. It is observed that inlet premixing play an important role for establishing the flow patterns and to develop flow pattern maps in VDW orientation.

scholarly journals Air-solid two-phase flow through a bend. (Flow patterns and particle velocities).

1988 ◽  
Vol 54 (498) ◽  
pp. 367-373 ◽  
Author(s):  
Toshitsugu TANAKA ◽  
Hideki ISHIBASHI ◽  
Tetsuya SHIRATORI ◽  
Yutaka TSUJI ◽  
Yoshinobu MORIKAWA
Keyword(s):  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through ◽  
Bend Flow ◽  
Particle Velocities

Study on Two-Phase Flow Through a Micro T-Junction

2003 ◽  
Author(s):  
Yuichi Shibata ◽  
Koh Ikeda ◽  
Peter M.-Y. Chung ◽  
Toshihide Hanari ◽  
Masahiro Kawaji
Keyword(s):  
Flow Rate ◽  
Two Phase Flow ◽  
Micro Electro Mechanical System ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Total Analysis System ◽  
Total Analysis ◽  
Flow Through ◽  
Analysis System

The field of microfluidics is developing rapidly with advances in MEMS (micro electro mechanical system) and μ TAS (micro total analysis system) technologies. In various devices, controlling the flow rate of liquid or gas accurately at micro or nanoliter volume levels is required. In this work, the gas-liquid two-phase flow patterns in a microchannel T-junction have been examined. The two-phase flow patterns were observed in the T-junction under two different gas and liquid injection conditions. The flow patterns of liquid and gas in the microchannel after the T-junction were also observed and classified into three types depending on the flow rate, and a two-phase flow pattern map was constructed. The mechanism of bubble breakup at a micro T-junction was also experimentally and analytically investigated.

Pressure Drop for Oil-Gas Two-Phase Flow Through Straight Horizontal Pipe

2007 ◽  
Author(s):  
Wenhong Liu ◽  
Liejin Guo ◽  
Ximin Zhang ◽  
Kai Lin ◽  
Long Yang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Flow Through ◽  
Oil Gas

scholarly journals Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 226
Author(s):  
Rashal Abed ◽  
Mohamed M. Hussein ◽  
Wael H. Ahmed ◽  
Sherif Abdou
Keyword(s):  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Two Phase Flow ◽  
Oxygen Transfer Rate ◽  
Flow Patterns ◽  
Oxygen Mass Transfer ◽  
Phase Flow ◽  
Two Phase ◽  
Airlift Pump

Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser.

Upward Vertical Two-Phase Flow Through an Annulus—Part II: Modeling Bubble, Slug, and Annular Flow

1992 ◽  
Vol 114 (1) ◽  
pp. 14-30 ◽  
Author(s):  
E. F. Caetano ◽  
O. Shoham ◽  
J. P. Brill
Keyword(s):  
Flow Pattern ◽  
Annular Flow ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Bubble Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through ◽  
Physical Phenomena ◽  
Good Agreement

Mechanistic models have been developed for each of the existing two-phase flow patterns in an annulus, namely bubble flow, dispersed bubble flow, slug flow, and annular flow. These models are based on two-phase flow physical phenomena and incorporate annulus characteristics such as casing and tubing diameters and degree of eccentricity. The models also apply the new predictive means for friction factor and Taylor bubble rise velocity presented in Part I. Given a set of flow conditions, the existing flow pattern in the system can be predicted. The developed models are applied next for predicting the flow behavior, including the average volumetric liquid holdup and the average total pressure gradient for the existing flow pattern. In general, good agreement was observed between the experimental data and model predictions.

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