scholarly journals Recovery of Particle Concentration Fields by Two-Phase Flow Visualization around Bodies

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
A.A. Zhelebovskiy ◽  
A.A. Mochalov ◽  
A.Yu. Varaksin
Keyword(s):  
Flow Visualization ◽  
Particle Concentration ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Experimental Characterization of Oil-Refrigerant Two-Phase Flow

2000 ◽  
Author(s):  
V. T. Lacerda ◽  
A. T. Prata ◽  
F. Fagotti
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Working Fluid ◽  
Phase Flow ◽  
Oil Viscosity ◽  
Two Phase ◽  
Mixture Flow ◽  
Horizontal Tubes ◽  
Constant Diameter ◽  
Oil Flow

Abstract Several phenomena occurring inside refrigerating systems depend on the interaction between the refrigeration oil and the refrigerant working fluid. Regarding the refrigeration cycle, good miscibility of oil and refrigerant assure easy return of circulating oil to the compressor through the reduction of the oil viscosity. Inside the compressor the lubricant is mainly used for leakage sealing, cooling of hot elements and lubrication of sliding parts. In the compressor bearing systems the presence of refrigerant dissolved in the oil greatly influences the performance and reliability of the compressor due to the outgassing experienced by sudden changes in temperature and pressure resulting in a two-phase mixture with density and viscosity strongly affecting the lubricant characteristics. A general understanding of the oil-refrigerant mixture flow is crucial in developing lubrication models to be used in analysis and simulation of fluid mechanics problems inside the compressor. In the present investigation the refrigeration oil flow with refrigerant outgassing is explored experimentally. A mixture of oil saturated with refrigerant is forced to flow in two straight horizontal tubes of constant diameter. One tube is used for flow visualization and the other is instrumented for pressure and temperature measurements. At the tubes inlet liquid state prevails and as flow proceeds the pressure drop reduces the gas solubility in the oil and outgassing occurs. Initially small bubbles are observed and eventually the bubble population reaches a stage where foaming flow is observed. The flow visualization allowed identification of the two-phase flow regimes experienced by the mixture. Pressure and temperature distributions are measured along the flow and from that mixture quality and void fraction were estimated.

scholarly journals Two-Phase Flow Visualization in the throttle of expansion valve

2007 ◽  
Vol 27 (Supplement1) ◽  
pp. 123-124
Author(s):  
Kazuhiko MATSUMURA ◽  
Yasuhiko FUJII ◽  
Shigeo KIMURA ◽  
Takahiro KIWATA
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Expansion Valve

Capacitive direct-imaging sensor for two-phase flow visualization

2016 ◽  
Author(s):  
Aluisio do N. Wrasse ◽  
Tiago P. Vendruscolo ◽  
Eduardo N. Santos ◽  
Fernando C. Castaldo ◽  
Rigoberto E. M. Morales ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Direct Imaging ◽  
Two Phase ◽  
Imaging Sensor

Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

2019 ◽  
Author(s):  
Hidenori Arisawa ◽  
Yuji Shinoda ◽  
Yoshiyuki Noguchi ◽  
Tatsuhiko Goi ◽  
Takahiko Banno ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Probe ◽  
Two Phase

Visualizing Test on the Distribution Rule of Coarse Particles in a Double Blade Pump

2019 ◽  
Author(s):  
Xianfang Wu ◽  
Xiao Tian ◽  
Minggao Tan ◽  
Houlin Liu
Keyword(s):  
Particle Concentration ◽  
Two Phase Flow ◽  
Particle Density ◽  
Particle Diameter ◽  
Phase Flow ◽  
Coarse Particles ◽  
Two Phase ◽  
Solid Liquid ◽  
Blade Pump ◽  
Flow Pump

Abstract As a typical fluid mechanics problem, pump blockage has always been a hot research topic. The obtaining of the distribution of coarse particles in the solid-liquid two-phase flow pump is the basis of improving its non-blocking performance. High-speed photography technique is applied to do visualizing test and research on the distribution of coarse particles in a double blade pump. The effects of particle concentration, particle density and particle diameter on the distribution of coarse particles in the solid-liquid two-phase flow pump at different phases are studied. Besides, the variation of hydraulic performance of the double blade pump under different parameters is also analyzed. The results show that the particles in the impeller mainly located in the vicinity of the blade pressure surface, and the distribution of the particles in each section of the volute is quite different. The great difference in particle density can result in obviously uneven distribution of particles. With the increase of particle diameter, particle density and particle concentration, the pump head and efficiency both decrease while the shaft power increase on the contrary. This research results can also provide a basis for the optimization design of solid-liquid two-phase flow pumps.

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