Critical Condition of Cavitation Occurrence in Various Liquids

1986 ◽  
Vol 108 (4) ◽  
pp. 428-432 ◽  
Author(s):  
S. Kamiyama ◽  
T. Yamasaki
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Critical Condition ◽  
Reasonable Agreement ◽  
Two Phase Flow ◽  
Cavitation Number ◽  
Experimental Results ◽  
Phase Flow ◽  
Two Phase ◽  
Predicted Values

An experimental study of cavitation occurrence in benzene, kerosene, gasoline, and Freon 12 was conducted using a square-edged orifice. The experimental results of the desinent cavitation number are compared with the calculated values predicted from two-phase flow analogy. The predicted values show reasonable agreement with experimental data for benzene and gasoline but require some modifications for kerosene and Freon 12.

Prediction of Gaseous Cavitation Occurrence in Various Liquids Based on Two-Phase Flow Analogy

1981 ◽  
Vol 103 (4) ◽  
pp. 551-556 ◽  
Author(s):  
S. Kamiyama ◽  
T. Yamasaki
Keyword(s):  
Experimental Data ◽  
Analytical Method ◽  
Reasonable Agreement ◽  
Two Phase Flow ◽  
Inert Gas ◽  
Low Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Thermodynamic Effects ◽  
Predicted Values

An analytical method for predicting the cavitation occurrence is developed applying an analogy with the choking condition of two-phase flow. The effects of the presence of inert gas and thermodynamic depression on the inception of cavitation are estimated in various liquids such as water, freon, hydrogen, and sodium. It is clearly shown that the thermodynamic effects are remarkable in the case of low flow velocity in fluids with small Spraker’s B-factor (<1.0m−1). Also, the predicted values show reasonable agreement with some experimental data.

Experimental Study on Resistance Characteristics in a 3 × 3 Rod Bundle

2014 ◽  
Author(s):  
Chaoxing Yan ◽  
Changqi Yan ◽  
Licheng Sun ◽  
Yang Wang
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Local Resistance ◽  
Local Pressure ◽  
Two Phase ◽  
Frictional Pressure Drop ◽  
Rod Bundle

Experimental study on resistance of air-water two-phase flow in a vertical 3 × 3 rod bundle was carried out under normal temperature and pressure. The rod diameter and pitch were 8 mm and 11 mm, respectively. The ranges of gas and liquid superficial velocity were 0.013∼3.763 m/s and 0.076∼1.792 m/s, respectively. The result indicated that the existing correlations for calculating frictional coefficient in the rod bundle and local resistance coefficient could not give favorable predictions on the single-phase experimental data. For the case of two-phase flow, eight correlations for calculating two-phase equivalent viscosity poorly predicted the frictional pressure drop, with the mean absolute errors around 60%. Meanwhile, the eight classical two-phase viscosity formulae were evaluated against the local pressure drop at spacer grid. It is shown that Dukler model predicted the experimental data well in the range of Rel<9000 while McAdams correlation was the best for Rel⩾9000. For all the experimental data, Dukler model provided the best prediction with MRE of 29.03%. Furthermore, approaches to calculate two-phase frictional pressure drop and local resistance were proposed by considering mass quality, two-phase Reynolds number and densities in homogenous flow model, resulting in a good agreement with the experimental data.

Two-Phase Flow-Induced Forces on Bends in Small Scale Tubes

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
M. F. Cargnelutti ◽  
S. P. C. Belfroid ◽  
W. Schiferli
Keyword(s):  
Experimental Data ◽  
Structural Integrity ◽  
Two Phase Flow ◽  
Experimental Results ◽  
Small Scale ◽  
Phase Flow ◽  
Momentum Exchange ◽  
Two Phase ◽  
Worst Case ◽  
Good Agreement

Two-phase flow occurs in many situations in industry. Under certain circumstances, it can be a source of flow-induced vibrations. The forces generated can be sufficiently large to affect the performance or efficiency of an industrial device. In the worst-case scenario, the mechanical forces that arise may endanger structural integrity. Thus, it is important to take these forces into account in designing industrial machinery to avoid problems during operation. Although the occurrence of such forces is well known, not much is known about their magnitudes because, unfortunately, the amount of experimental data available in literature are rather limited. This paper describes the experiments performed to measure forces in 6 mm diameter tubing containing a bend. Experiments are performed on bends of different radii, with the bend positioned horizontally or vertically. The experimental results are analyzed based on flow regime and bend configuration. A comparison with available experimental results for bigger internal pipe diameter shows a general good agreement. To improve future predictions, a simple model based on momentum exchange is proposed to estimate the forces generated by multiphase flow. The proposed model shows a good agreement with the experimental data.

Experimental Study on the Frictional Resistance of Gas-Liquid Two-Phase Flow in Vertical Helically Coiled Pipe

2011 ◽  
Vol 130-134 ◽  
pp. 2758-2761
Author(s):  
Shui Hua Zheng ◽  
Jie Gang Mu ◽  
Jia Li
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Friction Factor ◽  
Two Phase Flow ◽  
Frictional Resistance ◽  
Operating Conditions ◽  
Phase Flow ◽  
Two Phase ◽  
Partial Data

Experiments were carried out to learn about the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe. The expression of friction factor is established and the formula used to calculate the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe is defined based on partial data got from different experiment conditions. The calculating formula was verified by the experimental data and the result indicates that the formula is accurate enough to calculate the frictional resistance of gas-liquid two-phase flow in similar operating conditions.

An Experimental Study on Two-Phase Flow at Different Orientations

2015 ◽  
Author(s):  
T. M. Brueckner ◽  
M. A. Rahman ◽  
M. M. Awad
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Flow Regimes ◽  
Experimental Unit ◽  
Phase Flow ◽  
Viscous Effects ◽  
Two Phase ◽  
Memorial University Of Newfoundland

In the current study, an experimental study on two-phase flow at different orientations is carried out at the Fluids Laboratory, Memorial University of Newfoundland (MUN). Three different orientations are used. They are horizontal, vertical and slanted orientation respectively. The experimental unit consists of pipes that are three inches (DN 80) in diameter and are capable of producing many various regimes of gasliquid flows. The experimental unit has sensors to measure the pressure, temperature and volume flow at numerous locations. Experiments are conducted for two-phase flow (bubble and slug flow). The new experimental data can provide valuable insights on the viscous effects with many flow regimes, phase compositions and direction of flow. The results of this research provide valuable new experimental data on two-phase flow characteristics for many flow regimes that can improve the safety and efficiency of wellstream flows.

Theoretical and Experimental Study on Oil-Water Two-Phase Flow in a Downhole Venturi Meter

2012 ◽  
Vol 232 ◽  
pp. 284-287
Author(s):  
Si Huang ◽  
Peng Wang ◽  
Yu Hui Guan
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Flow Model ◽  
Two Phase Flow ◽  
Experimental Testing ◽  
Venturi Tube ◽  
Phase Flow ◽  
Two Phase ◽  
Oil Water

This paper presents a study on an oil-water two-phase flow model in a downhole Venturi meter by theoretical calculation, numerical simulation and experimental testing. The flow field and pressure characteristics with different flow and oil-water ratios in Venturi tube are investigated. It is found that the flow is stratified in the Venturi tube, the water phase accumulates in the tube center and the oil phase concentrates on the wall; the pressure drop is increased with flow; theoretical and numerical results are verified by experimental data.

EXPERIMENTAL STUDY ON VOID FRACTION OF ECCS TWO-PHASE FLOW

2017 ◽  
Author(s):  
Guojun Yu ◽  
Wuyue Ren ◽  
Jiawei Bian ◽  
G. H. Su ◽  
Wenxi Tian ◽  
...  
Keyword(s):  
Experimental Study ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Random Forces Resulting From Internal Two-Phase Flow on Bends and Tees

2006 ◽  
Author(s):  
E. de Langre ◽  
J. L. Riverin ◽  
M. J. Pettigrew
Keyword(s):  
Two Phase Flow ◽  
Experimental Results ◽  
Time Dependent ◽  
Phase Flow ◽  
Water Mixture ◽  
Dimensionless Form ◽  
Two Phase ◽  
Practical Applications ◽  
Random Forces

The time dependent forces resulting from a two-phase air-water mixture flowing in an elbow and a tee are measured. Their magnitudes as well as their spectral contents are analyzed. Comparison is made with previous experimental results on similar systems. For practical applications a dimensionless form is proposed to relate the characteristics of these forces to the parameters defining the flow and the geometry of the piping.

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