Experiments for entrainment rate of droplets in the annular regime

Bertodano, Martin A. Lopez de; Assad, A.; Beus, S.G.

doi:10.1016/s0301-9322(00)00046-x

Cited by 58 publications

(7 citation statements)

References 9 publications

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“…Different entrainment rate correlations were evaluated based on the n-pentane and iso-octane data of Kandlbinder [27], the R134a data of Kim and Chang [28] and the water data of Becker [20]. The Hewitt and Govan model [9] and the two correlations developed by Lopez de Bertodano et al [15,26] can capture most of the data points of n-pentane and water within the ±30% error band. For organic liquids, an additional term of Boiling number has been added to the entrainment rate correlation Eq.…”

Section: Discussionmentioning

confidence: 99%

“…(10), have a similar form. Moreover, it seems that the both models, i.e., [15] and [26], with an IEF value of 0.7, can predict most of the data points of n-pentane and water. The iso-octane data and the R134a data were largely over-predicted by models [15] and [26].…”

Section: Evaluation Of Entrainment Rate Correlationsmentioning

confidence: 98%

“…Later, based on air-water and R-113 entrainment rate data, Lopez de Bertodano et al [26] developed a new model to estimate the entrainment rate…”

Section: Liquid Film Dryout In Annular Flowmentioning

confidence: 99%

“…Figure 3 shows the predictive abilities of the Lopez de Bertodano et al model [15] (Eqs. (7) + (8)) and the Lopez de Bertodano et al model [26] (Eqs. (10) + (8)) at two IEF values.…”

Section: Evaluation Of Entrainment Rate Correlationsmentioning

confidence: 99%

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Dryout-type critical heat flux in vertical upward annular flow: effects of entrainment rate, initial entrained fraction and diameter

Wadekar

Wang

et al. 2017

Heat Mass Transfer

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This study aims to reveal the effects of liquid entrainment, initial entrained fraction and tube diameter on liquid film dryout in vertical upward annular flow for flow boiling. Entrainment and deposition rates of droplets were included in mass conservation equations to estimate the local liquid film mass flux in annular flow, and the critical vapor quality at dryout conditions. Different entrainment rate correlations were evaluated using flow boiling data of water and organic liquids including n-pentane, iso-octane and R134a. Effect of the initial entrained fraction (IEF) at the churn-to-annular flow transition was also investigated. A transitional Boiling number was proposed to separate the IEF-sensitive region at high Boiling numbers and the IEF-insensitive region at low Boiling numbers. Besides, the diameter effect on dryout vapor quality was studied. The dryout vapor quality increases with decreasing tube diameter. It needs to be pointed out that the dryout characteristics of submillimeter channels might be different because of different mechanisms of dryout, i.e., drying of liquid film underneath long vapor slugs and flow boiling instabilities.

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Section: Discussionmentioning

confidence: 99%

Section: Evaluation Of Entrainment Rate Correlationsmentioning

confidence: 98%

“…Later, based on air-water and R-113 entrainment rate data, Lopez de Bertodano et al [26] developed a new model to estimate the entrainment rate…”

Section: Liquid Film Dryout In Annular Flowmentioning

confidence: 99%

“…Figure 3 shows the predictive abilities of the Lopez de Bertodano et al model [15] (Eqs. (7) + (8)) and the Lopez de Bertodano et al model [26] (Eqs. (10) + (8)) at two IEF values.…”

Section: Evaluation Of Entrainment Rate Correlationsmentioning

confidence: 99%

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Dryout-type critical heat flux in vertical upward annular flow: effects of entrainment rate, initial entrained fraction and diameter

Wadekar

Wang

et al. 2017

Heat Mass Transfer

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“…10,11) Thus, extensive measurements of deposition rate and entrainment rate were conducted and also many correlations were developed. [12][13][14][15][16][17][18][19][20] Several researchers performed particle tracking simulation to deduce the deposition rate numerically. 21,22) It was pointed out in these numerical studies that the deposition rate is strongly influenced by the turbulence structure in high velocity gas core flow.…”

Section: Introductionmentioning

confidence: 99%

Effects of a Flow Obstacle on the Deposition Rate of Droplets in Annular Two-Phase Flow

Okawa

Kotani

Shimada

et al. 2004

Journal of Nuclear Science and Technology

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Double film extraction technique was used to elucidate the effects of a flow obstacle on the deposition rate of droplets in annular two-phase flow. In the present experiments, the test section was a round tube of 5 mm in inside diameter, air and water were used as test fluids and the flow direction was vertical upward; a short tube that was 2 mm in inside diameter, 3 mm in outside diameter and 20 mm in length was used as a flow obstacle. It was shown that the deposition rate of droplets was markedly increased if the present flow obstacle was concentrically placed in the flow channel. In all the experimental conditions tested, the deposition rates when the flow obstacle was placed were approximately 1.5 times larger than the deposition rates when no obstacle was placed. An empirical correlation was developed to elucidate the influence of flow parameters on the enhancement of deposition rate by the present flow obstacle of simple geometry.

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The effects of gravity on the features of the interfacial waves in annular two-phase flow

Wang¹,

Gabriel

Zhu³

2004

Microgravity Sci. Technol

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Experiments for entrainment rate of droplets in the annular regime

Cited by 58 publications

References 9 publications

Dryout-type critical heat flux in vertical upward annular flow: effects of entrainment rate, initial entrained fraction and diameter

Dryout-type critical heat flux in vertical upward annular flow: effects of entrainment rate, initial entrained fraction and diameter

Effects of a Flow Obstacle on the Deposition Rate of Droplets in Annular Two-Phase Flow

The effects of gravity on the features of the interfacial waves in annular two-phase flow

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