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

Zhu, Ge; Bi, Qincheng; Cai, Laizhong; Yan, Jingbo; Lv, Hang

doi:10.1016/j.applthermaleng.2018.04.040

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…where h c is the single-phase heat transfer coefficient (Kader, 1981 andEgorov, 2004) [38,39], T w is the wall temperatures, T l is the liquid temperatures, A b is the area covered by nucleating bubbles, h f v is the latent heat of evaporation, d vw is the bubble departure diameter, and f is the bubble departure frequency. In Equation (7), n is the active nucleate sites density, which indicates the number of nucleate sites per unit area and is related to surface roughness and wettability between the liquid phase and the wall [40]. Additionally, ρ l and k l is the liquid density and the conductivity within the control volume, ρ v is the vapor density within the control volume, and C pl is the specific heat of liquid at constant pressure.…”

Section: ) Basic Conservation Equationsmentioning

confidence: 99%

“…Yan [5,6] performed subcooled water flow boiling experiments in vertical circular tubes and proposed a modified Chen correlation to predict the subcooled heat transfer coefficient. Zhu [7] proposed a modified Liu and Winterton correlation for the entire subcooled boiling region to predict the heat transfer coefficients in swirl flow under high and non-uniform heat fluxes. Ji [8] explored the onset of nucleate boiling (ONB) of a one-side heated swirl tube and evaluated the prediction accuracy of the existing ONB correlations according to the experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…Tao [9] proposed a thermal dynamic simulation method based on the Eulerian multiphase method for swirl tubes under the subcooled boiling condition, considering the factors of the interphase transfer of energy and mass and the wall heat flux partitioning model. These studies show that whether the design parameters are reasonable or not has an important effect on the heat transfer performance of the HHF components of the fusion reactor [3][4][5][6][7][8][9][10][11][12][13]. The enhanced heat transfer performance optimization of HHF components of fusion devices is a multi-variable and multi-constraint optimization process, which has many design parameters, high CFD simulation cost, and low efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Sensitivity Analysis for Enhanced Heat Transfer Performance of Heat Sink with Swirl Flow Structure under One-Side Heating

Lei

Xie

2022

Energies

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Excellent heat transfer performance has increasingly become a key issue that needs to be solved urgently in the development process of large-scale fusion equipment. The study of heat transfer performance improvement to scientifically and reasonably determine the design parameters of the high heat flow (HHF) components of fusion reactors based on the efficient in-depth analysis of the heat transfer mechanism and its sensitive factors is of great significance. In this paper, a liquid-vapor two-phase flow model with subcooled boiling for a large length-diameter ratio swirl tube structure in the HHF calorimeter component is proposed to analyze the effects of key design parameters (such as inlet temperature of cooling water flow, swirl tube structure parameters, etc.) on its heat transfer performance. Then, considering the high computational cost of the liquid-vapor two-phase flow model, and in order to improve the efficiency of the sensitivity analysis of these design parameters, the polynomial response surface surrogate model of heat transfer performance function was constructed based on Latin hypercube sampling. On this basis, by combining the proposed surrogate model, the sensitivity index of each design parameter could be obtained efficiently using the Sobol global sensitivity analysis method. This method could greatly improve the calculation efficiency of the design parameter sensitivity analysis of HHF components in the fusion reactor, which provides vital guidance for the subsequent rapid design optimization of related components.

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Section: ) Basic Conservation Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Sensitivity Analysis for Enhanced Heat Transfer Performance of Heat Sink with Swirl Flow Structure under One-Side Heating

Lei

Xie

2022

Energies

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“…In this study, the average thermal efficiency was approximately 95%. The tests were carried out with the procedure as follows [28]:…”

Section: Test Proceduresmentioning

confidence: 99%

Experimental Investigation on Heat Transfer of Supercritical Water Flowing in the Subchannel with Grid Spacer in Supercritical Water-Cooled Reactor

et al. 2020

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Experimental investigations on the heat transfer performance of supercritical water flowing in the subchannel of supercritical water-cooled reactor (SCWR) simulated by a triangular channel were conducted at pressures of 23–28 MPa, mass flow rates of 700–1300 kg·m−2·s−1, and inner wall surface heat fluxes of 200–600 kW·m−2. An 8 mm diameter fuel rod with a 1.4 pitch to diameter ratio was used. The effects of pressure, mass flow rate, and heat flux on the heat transfer performance under the resistance of a standard grid spacer were analyzed. Experimental results showed the significant positive influence of the grid spacer on the supercritical water in the subchannel. Moreover, in the presence of the grid spacer, the parameters influenced the heat transfer with different degrees of strengthening reaction. In view of the phenomenon in the tests, the rule of the supercritical heat transfer was further revealed by the comparison between empirical formulas and experimental data. This paper mainly studied the positioning grid function and the fluid flow characteristics downstream of the subchannel under the influence of the standard grid spacer and the impact mechanism of each parameter on the whole heat transfer process coefficient.

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Assessment of heat transfer enhancement technique in flow boiling conditions based on entropy generation analysis: twisted-tape tube

et al. 2019

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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

Cited by 15 publications

References 30 publications

Efficient Sensitivity Analysis for Enhanced Heat Transfer Performance of Heat Sink with Swirl Flow Structure under One-Side Heating

Efficient Sensitivity Analysis for Enhanced Heat Transfer Performance of Heat Sink with Swirl Flow Structure under One-Side Heating

Experimental Investigation on Heat Transfer of Supercritical Water Flowing in the Subchannel with Grid Spacer in Supercritical Water-Cooled Reactor

Assessment of heat transfer enhancement technique in flow boiling conditions based on entropy generation analysis: twisted-tape tube

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