Investigation of hydraulic drag and heat transfer in a single-phase swirl flow under one-sided heating

Varava, A. N.; Дедов, А. В.; Komov, A. T.; Yagov, V. V.

doi:10.1007/s10740-006-0084-1

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…Validation tests were conducted to increase the reliability of the measurement equipment and experimental results. After comparing the single-phase heat transfer coefficients of all experimental cases with the values calculated using the Varava correlation [7], as shown in figure 4(a), it was observed that the average error rate (AE) was 1.94%, which is relatively low. In addition, the error rate of the measured differential pressure was 5.19%, which is relatively low as compared to that obtained with the Manglick single-phase pressure drop correlation for the swirl tube [8], as shown in figure 4(b).…”

Section: Validation Testmentioning

confidence: 99%

“…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. Figure 7(a) and (b) show the Tong correlation (D=1.05∼2.44 mm) and Owens & Schrock correlation (D=3, 4.63 mm), respectively.…”

Section: Newly Developed Correlation With Ai Regressionmentioning

confidence: 99%

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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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Section: Validation Testmentioning

confidence: 99%

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.

View full text Add to dashboard Cite

show abstract

“…A heat transfer validation test was conducted to ensure that the heat flux was accurately calculated and increase the reliability of the measuring equipment. The validation was conducted by comparing the heat transfer coefficient (HTC) values obtained through the experiment with those obtained through the Varava correlation [34], which is a well-known single-phase heat transfer correlation of the swirl tube. This was obtained using equations ( 2) and (3).…”

Section: Validation Testmentioning

confidence: 99%

Onset of flow instability with one-side heated swirl tube for fusion reactor safety

Lim

Lee

et al. 2021

Nucl. Fusion

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In this study, the onset of flow instability (OFI) heat flux of a one-side heated swirl tube is experimentally investigated. The OFI heat flux means the minimum heat flux that can cause flow instability by the vapor generated in the flow path. An analysis of the effect of system parameters on the OFI heat flux indicates that as the pressure increases, the bubble size decreases. Therefore, the void fraction decreases and, consequently, the OFI heat flux tends to increase. Similarly, the higher the flow rate and degree of subcooling, the faster the vapor can be removed; thus, the OFI heat flux increases. In addition, the prediction performances of the existing OFI correlations developed under the subcooled flow-boiling condition are evaluated. Therefore, although the Wang correlation indicates the lowest error rate, it yields a high mean absolute error rate of 87.75%. Thus, it is difficult to predict the OFI heat flux of a one-side heated swirl tube using the existing OFI correlations. Therefore, in this study, a new correlation is developed using a Python code created by employing an artificial intelligence regression method. The developed correlation incorporates the impact of one-side heating, swirl tape, mass flow rate, subcooling, and pressure (mean absolute error = 12.17%, root mean square error = 14.99%).

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Subcooled flow boiling heat transfer of water in a circular channel with a twisted tape insert under high and non-uniform heat fluxes

Zhu

Cai

et al. 2018

Applied Thermal Engineering

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Investigation of hydraulic drag and heat transfer in a single-phase swirl flow under one-sided heating

Abstract: The procedure and results are given of an experimental investigation of hydrodynamics and heat transfer in a subcooled swirl flow of water under conditions of one-sided heating of short channels.

Cited by 10 publications

References 5 publications

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

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

Onset of flow instability with one-side heated swirl tube for fusion reactor safety

Subcooled flow boiling heat transfer of water in a circular channel with a twisted tape insert under high and non-uniform heat fluxes

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