An empirical correlation for two-phase frictional performance in small diameter tubes

Chen, Ing Youn; Yang, Kai; Wang, Chi-Chuan

doi:10.1016/s0017-9310(02)00074-1

Cited by 55 publications

(29 citation statements)

References 10 publications

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“…Due to the demand for decreasing the total refrigerant charge required in a refrigeration system, many of the tubes for these heat exchangers are approaching hydraulic diameters on the order of, and less than, 3 mm. Many researchers [1][2][3][4][5][6][7][8][9][10][11][12] have conducted for two-phase pressure drop in these tubes.…”

Section: Introductionmentioning

confidence: 99%

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Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Son

2012

Heat Mass Transfer

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The condensation pressure drop characteristics for pure refrigerants R22, R134a, and a binary refrigerant mixture R410A without lubricating oil in a single circular microtube were investigated experimentally. The test section consists of 1,220 mm length with horizontal copper tube of 3.38 mm outer diameter and 1.77 mm inner diameter. The experiments were conducted at refrigerant mass flux of 450-1,050 kg/m 2 s, and saturation temperature of 40°C. The main experimental results showed that the condensation pressure drop of R134a is higher than that of R22 and R410A for the same mass flux. The experimental data were compared against 14 two-phase pressure drop correlations. A new pressure drop model that is based on a superposition model for refrigerants condensing in the single circular tube is presented.

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Section: Introductionmentioning

confidence: 99%

“…Chen et al [10] investigated experimental two-phase pressure drop data in small diameter tubes (d \ 10 mm) from the literature which contain eight refrigerant and three air-water datasets. Comparisons between the data and the predictions indicate that the Chisholm correlation fails to predict the data.…”

Section: Introductionmentioning

confidence: 99%

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Son

2012

Heat Mass Transfer

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“…Chen et al [6] developed an empirical correlation based on the homogeneous and Friedel [3] model. It was recognized by the research of Chen et.al.…”

Section: Introductionmentioning

confidence: 99%

“…It was recognized by the research of Chen et.al. [6],Garimella [7], Triplett [8]that surface tension force plays important role for tubes of diameters less than 10mm.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Pressure Drop Calculations in Small Diameter Inclined Tubes

Autee

Rao

Puli

et al. 2012

IJET

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Effect of inclination on two-phase frictional pressure drop was investigated in small diameter circular tubes with inner diameters of 4.0, 6.0, 8.0 and 10.0 mm using air and water. Pressure drop was measured and compared with various existing models commonly used for macro and micro channels such as homogeneous, LockhartMartinelli, Chisholm, Friedel, Mishma Hibiki, and Zang Mishma. It was found that existing correlations are inadequate in predicting pressure drop for small diameter inclined tubes. The void fraction is calculated using a general void fraction correlation in two-phase flow for various pipe orientations. Based on analysis of present experimental frictional pressure drop data, a correlation is proposed for predicting Chisholm parameter "C" in small diameter inclined tubes. There was a significant ordering of pressure drop data with respect to Reynolds number, Webber number and Bond number for each diameter.

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“…However, the conventional ones smaller than about 12 mm i.d. are usually referred to as "small diameter pipes or tubes" by, say, Barnea et al (2) , Luninski et al (3) , Mishima and Hibiki (4) and Chen et al (5) . The flow in such pipes appears in various cooling devices because they are downsizing.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Tension on Two-Phase Gas-Liquid Flows in Horizontal Small Diameter Pipes

Sadatomi

Kawahara

Matsuo

et al. 2010

JPES

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The purpose of the present study is to clarify both the surface tension and the pipe diameter effects on two-phase flows in horizontal small diameter pipes. In the experiments, four-kinds of test liquids with different fluid properties were used together with 3, 5 and 9 mm i.d. test pipes. The flow parameters studied were flow pattern, bubble size, liquid film thickness, void fraction and pressure drop, etc. The flow patterns covered were bubbly, slug, and annular flows. From the measured data, the data of interfacial friction force per unit volume, F i , was also obtained.By comparing data obtained in different pipe and test liquid combinations, the effects of the surface tension and the pipe diameter on the flow parameters have been clarified. In addition, new correlations of mean liquid film thickness and interfacial friction factor in annular flow have been derived with some dimensionless groups.

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An empirical correlation for two-phase frictional performance in small diameter tubes

Cited by 55 publications

References 10 publications

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

Two-Phase Pressure Drop Calculations in Small Diameter Inclined Tubes

Effects of Surface Tension on Two-Phase Gas-Liquid Flows in Horizontal Small Diameter Pipes

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