A new pressure drop correlation for subcooled flow boiling of refrigerants

Hahne, Ε.; Spindler, Klaus; Skok, H.

doi:10.1016/0017-9310(93)90089-o

Cited by 23 publications

(4 citation statements)

References 2 publications

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“…Therefore, the flow mechanism of SP pressure drop cannot be simply applied to the hypervapotron. Subcooled boiling flow has also been studied in depth, and many pressure drop correlations have been proposed [26,[30][31][32][33]. The forms of subcooled boiling pressure drop correlations are different, but most of them contain r.…”

Section: Authors Correlationsmentioning

confidence: 99%

Pressure Drop Characteristics of Subcooled Water in a Hypervapotron under High and Non-Uniform Heat Fluxes

Zhu,

Mei,

Yan

et al. 2023

Energies

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To study the pressure drop characteristics of hypervapotron, which was designed as a water-cooling structure in the divertor dome of the fusion reactor, the pressure drop tests of subcooled water were carried out in a vertically upward hypervapotron. To simulate the one-side radiant heating condition in the engineering application, the non-uniform heat fluxes were obtained by using the off-center electrically heating method. The system parameters were as follows: mass flux G = 2000–5000 kg·m−2·s−1, inlet pressure p = 2–4 MPa, and equivalent one-side radiating heat flux qe = 0–5 MW·m−2. The effects of the parameters on the pressure drop were discussed in detail. It was observed that in the single-phase (SP) region, the pressure drop was little influenced by the inlet fluid temperature (Tb,in). However, in the subcooled boiling region, the pressure drop increased rapidly with the increasing Tb,in. A higher G leads to a high pressure drop. In the SP region, the influence of p on the pressure drop is not obvious, and the pressure drop decreased with the increasing qe. The test data are used to evaluate the typical pressure drop correlation, and the results show that none of these correlations can predict the pressure drop well under the test conditions. Therefore, a new pressure drop correlation is proposed for subcooled water in a hypervapotron under high and non-uniform heat fluxes. The new correlation has a high prediction accuracy for the test data, and the mean relative error (MRE) and root mean square error (RMSE) are 0.72% and 4.33%, respectively. The test results have a reference value for the design of the water-cooling structure of the diverter.

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Section: Authors Correlationsmentioning

confidence: 99%

Pressure Drop Characteristics of Subcooled Water in a Hypervapotron under High and Non-Uniform Heat Fluxes

Zhu,

Mei,

Yan

et al. 2023

Energies

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“…This represents the effects of heat flux, inlet subcooling, and channel length, respectively, as shown in equations (3)-( 6)). Because it is difficult to directly measure the void fraction through a visualization experiment under sub-cooled flow boiling experimental conditions, The twophase pressure drop correlations presented in previous studies [9][10][11][12][13][14] were developed by expressing the correlation as a function of variables that can affect the amount of vapor present in the channel. The prediction performance of the existing correlations through equation (7) are shown in figure 7 and table 2.…”

Section: Newly Developed Correlation With Ai Regressionmentioning

confidence: 99%

“…Tong [12] ( ) ( ) ( ) In summary, many experimental studies have been conducted on the two-phase pressure drop multiplier under subcooled flow boiling conditions, but most of them are concentrated in the microchannel, as shown in table 3. In addition, there are a few experimental studies on macro-channels such as Hahne [11] and Baburajan [13], but the maximum heat flux in their research does not exceed 500 kW m −2 . Therefore, in this study, the authors intend to develop a two-phase pressure drop correlation for a swirl tube under one-side high heat load conditions.…”

Section: Newly Developed Correlation With Ai Regressionmentioning

confidence: 99%

Two-phase pressure drop analysis of swirl tube in one-side high heat load condition for plasma facing component application

Lim¹,

Lee²,

Hwang³

et al. 2021

Phys. Scr.

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In this study, the two-phase pressure drop of a one-side heated swirl tube (twist ratio=3, 5) was experimentally studied. If the a heat flux is gradually increased, the vapor blocks the flow path, thus leading to an increase in the differential pressure. As the inset sub-cooling and mass flow rate increase, the vapor is removed by condensation more rapidly, and thus, the rate of increase of differential pressure is reduced. From the evaluation of the prediction performance of the existing two-phase pressure drop correlations, it was found that the mean error rates of all correlations exceeded 50%. This is because most of the existing correlations were not developed based on the microchannel, but they were not focused on the swirl tube. Therefore, the authors developed a new two-phase pressure drop multiplier correlation for a one-side heated swirl tube that reflects the effect of the twist tape by modifying the Manglick single-phase swirl tube pressure drop correlation using the AI regression method.

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“…Em se realizando a correlação com os resultados experimentais, a relação que define o multiplicador bifásico, conforme HAHNE et aL (1993) (3.5) apresenta que tal parâmetro é a relação entre a perda de carga bifásica e a monofásica. Caso seja avaliada a perda de carga monofásica para o líquido, o multiplicador bifásico seria apresentado como tftl 2 e, no caso do vapor, rj;./.…”

Section: Visualização Do Escoamentounclassified

Condensação conectiva em canais de pequenos diâmetros, com e sem uma fronteira porosa

Riehl

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A new pressure drop correlation for subcooled flow boiling of refrigerants

Cited by 23 publications

References 2 publications

Pressure Drop Characteristics of Subcooled Water in a Hypervapotron under High and Non-Uniform Heat Fluxes

Pressure Drop Characteristics of Subcooled Water in a Hypervapotron under High and Non-Uniform Heat Fluxes

Two-phase pressure drop analysis of swirl tube in one-side high heat load condition for plasma facing component application

Condensação conectiva em canais de pequenos diâmetros, com e sem uma fronteira porosa

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