Subcooled water flow boiling heat transfer in screw cooling tubes under one-sided heating conditions

Liu, Peng; Peng, Xuebing; Song, Yuntao; Mao, Xin

doi:10.1016/j.applthermaleng.2016.11.012

Cited by 16 publications

(3 citation statements)

References 20 publications

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“…Commonly used enhanced heat transfer techniques include spiral tubes, cyclonic elements, additives, hypervapotron structures(HV), etc. Liu et al [3]. used spiral tubes and cyclonic element enhanced heat transfer techniques to numerically simulate the boiling heat transfer of subcooled flow at high heat flow density on one side, and found that the swirl flow and secondary vortex in spiral tubes can enhance the turbulence intensity of the fluid and the cooling performance is better than that of smooth tubes, and the best heat transfer performance of the tubes with cyclonic elements.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Enhanced Heat Transfer with Tilted Hypervapotron Structure of the Fusion Blanket

Gao

et al. 2023

J. Phys.: Conf. Ser.

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High flux components in fusion reactor are designed to transfer high thermal loads from the core plasma under steady-state operation and emergency conditions. In order to improve the heat transfer ability, hypervapotron structure is proposed to promote the heat transfer performance by optimizing the thermal hydraulic design. In this paper, three-dimensional numerical simulation was carried out using CFD methods for the improved solution of the first wall. The results show that the heat transfer performance of the triangular fin structure with tilt angle of 30° is superior to 0 °, 15°and 45°. At a typical flow rate of 2 m/s, the heat transfer efficiency of the triangular fin with tilt angle of 30° improved by a maximum of 118.1% compared with that of the smooth flow channel. In addition, the heat transfer performance of the triangular fin structure is better than other fin structure, and its maximum temperature drops by 136.3K compared to the smooth flow channel. The design solution may provide a viable new method for efficient cooling of future fusion reactor components with high heat flux.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Enhanced Heat Transfer with Tilted Hypervapotron Structure of the Fusion Blanket

Gao

et al. 2023

J. Phys.: Conf. Ser.

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“…Drawing upon insights from international research, it becomes evident that a comprehensive examination of the heat transfer mechanisms within internal meshing screw devices holds paramount significance [30][31][32]. Nonetheless, the investigation into heat transfer within volumetric-stretching-dominated internal meshing screw mixers remains an uncharted territory.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Research on Heat Transfer Characteristics Based on Internal Meshing Screw

Hao,

Guo,

et al. 2023

Applied Sciences

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The mixing and processing of high-viscosity materials play a pivotal role in composite material processing. In this context, the internal meshing screw mixer, rooted in volume extensional rheology, offers distinct advantages, including heightened mixing efficiency, exceptional material adaptability, and favorable thermomechanical properties. This research endeavors to advance our understanding of these qualities by presenting an in-depth exploration of internal meshing screw mixing. To facilitate this, an internal meshing screw mixing experimental apparatus was meticulously constructed, accompanied by extensive numerical simulations and experimental investigations into its heat transfer characteristics. Two distinct heat transfer modes are established: Mode 1 entails the transfer of the high temperature from the outer wall of the stator to the interior, while Mode 2 involves the transmission of the high temperature from the inner wall of the rotor to the exterior. The ensuing research yields several notable findings: 1. It is evident that higher rotational speeds lead to enhanced heat transfer efficiency across the board. However, among the three rotational speeds examined, 60 rpm emerges as the optimal parameter for achieving the highest heat transfer efficiency. Furthermore, within this parameter, the heat transfer efficiency is superior in Mode 1 compared to Mode 2. 2. As eccentricity increases, a corresponding decline in comprehensive heat transfer efficiency is observed. Moreover, the impact of eccentricity on heat transfer efficiency becomes increasingly pronounced over time. 3. A lower gap dimension contributes to higher heat transfer within the system. Nevertheless, this heightened heat transfer comes at the expense of reduced stability in the heat transfer process. 4. It is demonstrated that heat transfer in Mode 1 primarily follows a convection heat transfer mechanism, while Mode 2 predominantly exhibits diffusion-based heat transfer. The heat transfer efficiency of Mode 1 significantly surpasses that of Mode 2. This research substantiates its findings with the potential to enhance the heat transfer efficiency of internal meshing screw mixers, thereby making a valuable contribution to the field of polymer engineering and science.

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“…Manglik and Bergles [43] found that the process of boiling is the same for flows with twists as with straight flows. Currently there are only a few studies performing conjugate heat transfer CFD on the effects of twisted-tape inserts on subcooled flows under extremely high heat fluxes [44,45]. Hence, there is a need for further study of these problems and this paper aims to respond to this issue.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Subcooled Flow Boiling and Heat Transfer Enhancement: Validation and Applicability to Fusion Reactor Target Design

Young

Karimi

MacKenzie

2020

Journal of Energy Resources Technology

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Boiling flows are an extremely efficient mechanism for the transfer of ultrahigh heat fluxes and used in numerous industrial applications. In this paper, the accuracy of computational fluid dynamics in predicting the temperature distributions and heat transfer performance is examined within a nuclear fusion reactor divertor. The aim is to establish the role of computational fluid dynamics (CFD) within the design of complicated high heat flux components using a semi-mechanistic approach to flow boiling that is independent of geometry and flow conditions. An Eulerian–Eulerian two-fluid method is developed and a conjugate heat transfer model is validated against the existing experimental data where available. Overall, a satisfactory accuracy is achieved in the prediction of several important quantities. Temperature distribution throughout the divertor is found to be highly accurate and aligns with the physical testing across two expected operating regimes. Additionally, the system heat transfer coefficients and coolant temperatures are close to the assumptions already established within the literature. Heat transfer enhancement is a critical component of the divertor design, and a twisted-tape insert appears to be necessary for the system to withstand ultrahigh heat fluxes encountered within the fusion reactor. The results show that the inclusion of a twisted tape improved the heat transfer coefficient of the system by almost 45% allowing the divertor to withstand the required heat fluxes of 10 MW/m2 and 20 MW/m2.

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Subcooled water flow boiling heat transfer in screw cooling tubes under one-sided heating conditions

Cited by 16 publications

References 20 publications

Numerical Investigation on Enhanced Heat Transfer with Tilted Hypervapotron Structure of the Fusion Blanket

Numerical Investigation on Enhanced Heat Transfer with Tilted Hypervapotron Structure of the Fusion Blanket

Numerical Simulation and Experimental Research on Heat Transfer Characteristics Based on Internal Meshing Screw

Numerical Modeling of Subcooled Flow Boiling and Heat Transfer Enhancement: Validation and Applicability to Fusion Reactor Target Design

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