Single bubble breakup in the flow field induced by a horizontal jet—The experimental research

2018 ◽  
Vol 14 (1) ◽  
pp. e2261 ◽  
Author(s):  
Junjie Feng ◽  
Jiaying Cao ◽  
Jie Jiang ◽  
Bing Sun ◽  
Ziqi Cai ◽  
...  
Keyword(s):  
Flow Field ◽  
Experimental Research ◽  
Single Bubble ◽  
Bubble Breakup

Single bubble breakup in the flow field induced by a horizontal jet—The numerical simulation

2019 ◽  
Vol 14 (5) ◽  
Author(s):  
Baiquan Su ◽  
Jiaying Cao ◽  
Xiongbin Huang ◽  
Ziqi Cai ◽  
Zhengming Gao
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Single Bubble ◽  
Bubble Breakup

scholarly journals Influence of Vortex Finder Structure on Separation Performance of Double-Overflow Three-Product Hydrocyclones

Separations ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 79
Author(s):  
Yuekan Zhang ◽  
Jiangbo Ge ◽  
Lanyue Jiang ◽  
Hui Wang ◽  
Junru Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Experimental Research ◽  
Separation Efficiency ◽  
Structural Parameters ◽  
Separation Performance ◽  
Insertion Depth ◽  
Flow Field Characteristics ◽  
Vortex Finder ◽  
Fine Classification

In view of the difficulty of traditional hydrocyclones to meet the requirements of fine classification, a double-overflow three-product (internal overflow, external overflow and underflow) hydrocyclone was designed in this study. Numerical simulation and experimental research methods were used to investigate the effects of double-overflow flow field characteristics and structural parameters (i.e., internal vortex finder diameter and insertion depth) on separation performance. The research results showed that the larger the diameter of the internal vortex finder, the greater the overflow yield and the larger the cut size. The finest internal overflow product can be obtained when the internal vortex finder is 30 mm longer than the external vortex finder. The separation efficiency is highest when the internal vortex finder is 30 mm shorter than the external vortex finder.

scholarly journals Experimental research on flow field of high head pump turbine based on PIV test

2021 ◽  
Vol 627 ◽  
pp. 012016
Author(s):  
D M Liu ◽  
L B Ma ◽  
N Li ◽  
Y Z Zhao ◽  
Huan Cheng
Keyword(s):  
Flow Field ◽  
Experimental Research ◽  
Pump Turbine ◽  
High Head

scholarly journals Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2426
Author(s):  
Xue ◽  
Liu ◽  
Lu ◽  
Gao ◽  
Meng
Keyword(s):  
Flow Field ◽  
Experimental Research ◽  
Flow Rate ◽  
Guide Vane ◽  
Rotating Stall ◽  
Dynamics Simulation ◽  
Positive Slope ◽  
Pump Mode ◽  
Pump Turbine ◽  
Pump Performance

The rotating stall is an unstable flow phenomenon of pump turbines in pump mode, which is of increasing concern to scientists and engineers working on pump turbines. However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured data and experimental research on flow fields are seldom reported. By utilizing PIV (particle image velocimetry) measuring equipment, the flow field within the guide vane zone of a low specific speed pump turbine in pump mode was measured. By measuring and analyzing the transient flow field, the evolutionary process of the rotating stall within the guide vane passages was determined. We found that for all three tested guide vane openings, regardless of whether the positive slope appeared or not, a pre-stall operating point was found for each opening in the process of decreasing the flow rate. The analysis of the loss within the flow field indicated that the dissipation-induced loss increased greatly after the rotating stall appeared. The pump performance curves at the three guide vane openings showed an inflection at the pre-stall point. When the flow rate is larger than that of the pre-stall point, the head of the pump turbine dramatically increases as the flow rate decreases. However, when the flow rate is smaller than the pre-stall point, such increases noticeably slows down.The research results showed that whether the positive slope on the pump performance curve occurred or not, instability caused by the rotating stall should be of great concern.

Behavior of a small single bubble rising in a rotating flow field

2004 ◽  
Vol 44 (5) ◽  
pp. 533-540 ◽  
Author(s):  
T. Yamaguchi ◽  
M. Iguchi ◽  
T. Uemura
Keyword(s):  
Flow Field ◽  
Single Bubble ◽  
Rotating Flow ◽  
Bubble Rising

scholarly journals Experimental Research of the Secondary Flow in Rectilinear Turbine Cascades

1985 ◽  
Author(s):  
Ye Da-Jun ◽  
Zhou Li-Wei
Keyword(s):  
Flow Field ◽  
Secondary Flow ◽  
Experimental Research ◽  
Turbine Cascade ◽  
Experiment Data ◽  
Loss Model ◽  
Turbine Cascades ◽  
Secondary Flow Field

For studying the secondary flow in a turbine cascade, the flow field is measured in detail. The measurements of pressure and velocity are taken at various axial planes upstream of, within, and downstream of the cascade by a 4-hole probe. The static pressures are taken on the endwall, suction and pressure surfaces. By treating the experiment data the mechanism of the secondary flow field and the loss model are proposed in this paper.

Modulation of turbulent flow field in an oscillating grid system owing to single bubble rise

2018 ◽  
Vol 185 ◽  
pp. 26-49 ◽  
Author(s):  
Mohammad Mainul Hoque ◽  
Subhasish Mitra ◽  
Geoffrey M. Evans ◽  
Mayur J. Sathe ◽  
Jyeshtharaj B. Joshi
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
Single Bubble ◽  
Grid System ◽  
Bubble Rise ◽  
Turbulent Flow Field ◽  
Oscillating Grid
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