Frictional pressure drop and void fraction analysis in air–water two-phase flow in a microchannel

Barreto, E.X.; Oliveira, J.L.G.; Passos, Júlio César

doi:10.1016/j.ijmultiphaseflow.2015.01.008

Cited by 23 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Shedd [29] 6.98 Revellin et al [21] 4.75 Portillo et al [27] 9.55 Keinath [59] 16.17 Barreto et al [32] 14.95 Table 11. Mean absolute error between the new correlation and each database for macrochannel tested.…”

Section: Authors (%)mentioning

confidence: 99%

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

Gardenghi

Filho

Chagas

et al. 2020

Fluids

View full text Add to dashboard Cite

Void fraction is one of the most important parameters for the modeling and characterization of two-phase flows. This manuscript presents an overview of void fraction measurement techniques, experimental databases and correlations, in the context of microchannel two-phase flow applications. Void fraction measurement techniques were reviewed and the most suitable techniques for microscale measurements were identified along its main characteristics. An updated void fraction experimental database for small channel diameter was obtained including micro and macrochannel two-phase flow data points. These data have channel diameter ranging from 0.5 to 13.84 mm, horizontal and vertical directions, and fluids such as air-water, R410a, R404a, R134a, R290, R12 and R22 for both diabatic and adiabatic conditions. New published void fraction correlations as well high cited ones were evaluated and compared to this small-diameter void fraction database in order to quantify the prediction error of them. Moreover, a new drift flux correlation for microchannels was also developed, showing that further improvement of available correlations is still possible. The new correlation was able to predict the microchannel database with mean absolute relative error of 9.8%, for 6% of relative improvement compared to the second-best ranked correlation for small diameter channels.

show abstract

Section: Authors (%)mentioning

confidence: 99%

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

Gardenghi

Filho

Chagas

et al. 2020

Fluids

View full text Add to dashboard Cite

show abstract

“…Passage size and fluid Flow behavior reported Barnea (1987) [1] 4-12 mm tubes Dispersed bubble, elongated bubble, slug, churn and annular Air-water Damianides and Westwater (1988) [2] 1-5 mm tubes Dispersed bubble, bubbly, plug, slug, pseudo slug, wavy and annular [3] 1-4 mm tubes Bubbly, slug, churn, annular and annular-mist flow Air-water Lin et al (1999) [4] 0. All standard regimes observed Revellin and Thome (2007) [14] 0.51 and 0.8 mm tubes Isolated bubble, coalescing bubble and annular flow (continued) 6 2 Significance of Flow Visualization in Microchannels All standard regimes observed Revellin and Thome (2007) [14] 0.51 and 0.8 mm tubes Isolated bubble, coalescing bubble and annular flow (continued) 6 2 Significance of Flow Visualization in Microchannels…”

Section: Significance Of Flow Visualization In Microchannelsmentioning

confidence: 99%

Heat Transfer and Pressure Drop in Flow Boiling in Microchannels

Saha¹,

Celata²

2016

SpringerBriefs in Applied Sciences and Technology

View full text Add to dashboard Cite

“…In circular tubes with a diameter of 1.2 mm, Barreto et al, [13] investigated the two-phase flow of water and air fluids. The gas velocity used in this analysis ranges from JG = 0.1-34 m/s to JL superficial liquid velocity = 0.1 to 3.5 m/s.…”

Section: Introductionmentioning

confidence: 99%

Void Fraction Features Using Image Processing on a Clear Capillary Pipe with a 45° Slope to The Horizontal Line of Two-Phase Air-Liquid Flow with High Viscosity

Sukamta

Noviyanto

Sudarja

et al. 2021

ARFMTS

View full text Add to dashboard Cite

In supercomputer equipment, X-rays, satellite cryogenic cooling systems, and others, the two-phase flow phenomenon in mini channels are also used. A significant issue for them is the void fraction function induced by superficial velocity, fluid viscosity, and slope. This analysis's objective was to determine the characteristics of void fraction values on the bubble, plug, slug-annular, annular, churn in horizontal capillary pipes. The research was carried out on a mini-pipe with a diameter of 1.6 mm and a length of 130 mm, mounted at a horizontal angle of 45 degrees. A mixture of 40, 50, 60, and 70 percent air-pure water and glycerin concentrations is the fluid used. The flow pattern video was shot using a Nikon J4 camera with a speed of 1200 fps, gas speed (JG) at 2.5x10-2-66.3 m/s intervals, and fluid velocity (JL) at 3.3x10-2 - 4.935 m/s intervals. A digital image processing technique is used to calculate the value of a void fraction with the MATLAB R2014a and Microsoft Excel application software. This paper's new finding is that the value of the void fraction for bubbly flow indicates conditions that are not so stable and have a low value. The void fraction for plug flow tends to be close to 1 over a certain period; this is induced by the air cavity that almost fills the vessel, as shown by the effects of the image processing and the graphs the time series of voids. The void fraction has a value that fluctuates to a moderate value in the churn flow pattern.

show abstract

Frictional pressure drop and void fraction analysis in air–water two-phase flow in a microchannel

Cited by 23 publications

References 25 publications

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

Heat Transfer and Pressure Drop in Flow Boiling in Microchannels

Void Fraction Features Using Image Processing on a Clear Capillary Pipe with a 45° Slope to The Horizontal Line of Two-Phase Air-Liquid Flow with High Viscosity

Contact Info

Product

Resources

About