Phase distributions of boiling flow in helical coils in high gravity

Xie, Liyao; Xie, Yongqi; Yu, Jian

doi:10.1016/j.ijheatmasstransfer.2014.08.094

Cited by 17 publications

(3 citation statements)

References 20 publications

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“…The fundamental governing equations Eqs. 1-3 for the simulation of flow and heat transfer include the continuity, momentum, and energy equations, respectively (De Schepper et al, 2008;Yang et al, 2008;Xie et al, 2015;Jiaqiang et al, 2016):…”

Section: Heat Transfer Model Of Shell Sidementioning

confidence: 99%

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Lu,

Wang,

Zheng

et al. 2024

Front. Energy Res.

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Introduction: A simulation model was developed by coupling a one-dimensional (1D) system code and 3D CFD software, to analyze the three-dimensional (3D) flow and heat transfer characteristics of the once-through steam generator (OTSG).Methods: The shell side of the OTSG was simulated by FLUENT, and the tube side was simulated by the system code LOCUST. Through spatial mapping, the 1D and 3D simulations were coupled along the outer wall of the OTSG's helically coiled tubes.Results and Discussion: This coupling method enabled the acquisition of high-resolution flow and heat transfer characteristics of the OTSG, and the error of heat flux calculation result by the coupled model is within 15%. Through coupling simulation analysis of the prototype OTSG, it was found that the inlet and outlet temperature difference reached as high as 150°C. The unevenness of the radial temperature distribution increased along the flow direction, and the wake swing effect caused by the sweeping flow of the tube bundle at the exit position was evident. The results of this study provide reference and a coupled simulation method for the engineering design and thermal-hydraulic characteristics analysis of OTSG.

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Section: Heat Transfer Model Of Shell Sidementioning

confidence: 99%

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Lu,

Wang,

Zheng

et al. 2024

Front. Energy Res.

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show abstract

“…As for gravity, Xie et al [6] investigated the gas and liquid distribution of flow boiling in a spiral tube experimentally and numerically and found that the evolution of the gas and liquid distribution was connected with the direction and magnitude of the hypergravity. Dong and Jiang [7] conducted flow boiling experiments of Al 2 O 3 -water in a microchannel under hypergravity and normal gravity by a rotating platform and found that heat transfer coefficient under hypergravity is slightly less than that under normal gravity.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on flow boiling characteristics in sinusoidal channels of airborne micro heat exchanger

Liang

Wang

2022

J. Phys.: Conf. Ser.

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With the miniaturization of airborne system, heat dissipation has become a critical issue. Since sinusoidal channel can enhance flow disturbance, it has a stronger heat exchange capacity than that of straight channel. However, flow boiling characteristics in sinusoidal channel are more complex. Here, numerical simulations of flow boiling in sinusoidal and straight microchannels are conducted based on the VOF model with the inner diameter of 1 mm, mass flux of 500 kg/m2 s and heat flux of 50 kW/m2. The effects of channel structure and hypergravity are obtained. The simulation results indicate that bubble evolution in sinusoidal channel is more complex than that in straight channel, and bubbles are more likely to coalesce, deform and break. Vortices appear in sinusoidal channel and disrupt the near-wall boundary layer. Bubble evolution combined with vortices affect the flow boiling performances. For straight channel, dryout is less likely to occur, while for sinusoidal channel, it is more likely due to more drastic flow changes. Furthermore, the transition of flow patterns is faster under hypergravity. For sinusoidal channel, flow patterns transform earlier into slug and circular flows.

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“…However, it should be recognized that helical coils can be used as one of the heat transfer enhancement techniques in aerospace which will experience a high gravity stage. High gravity conditions would make the boiling flow and heat transfer more complicated and make the experiment more difficult [29,30]. Thus, to investigate the effects of the elevated high gravity on the boiling flow and heat transfer is very important and challenging.…”

Section: Introductionmentioning

confidence: 99%

A data driven deep neural network model for predicting boiling heat transfer in helical coils under high gravity

Liang

Xie

Day

et al. 2021

International Journal of Heat and Mass Transfer

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Phase distributions of boiling flow in helical coils in high gravity

Cited by 17 publications

References 20 publications

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Numerical simulation on flow boiling characteristics in sinusoidal channels of airborne micro heat exchanger

A data driven deep neural network model for predicting boiling heat transfer in helical coils under high gravity

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