A CFD Modeling of Subcooled Pool Boiling

Nguyen, Thang; Duong, H. N.; Tran, Vivian; Kikura, Hiroshige

doi:10.1007/978-981-10-7149-2_52

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…However, the accuracy of this kind of model greatly relies on the nucleation site density and contact angle closures. Another type of model assumes that the heat flux and the vapor generated from the heated solid surface are uniform and constant . Lee et al developed a macroscopic model based on this kind of model which considered the freeboard region to improve the simulation accuracy of the nucleate pool boiling.…”

Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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show abstract

“…Where is the volume of the bubble, which is calculated by the bubble departure diameter. is the latent heat of evaporation, is the active nucleate site density, and is the frequency of bubble departure [20,21].…”

Section: The Extended Rpi Model (Non-equilibrium Boiling Model)mentioning

confidence: 99%

Numerical study on heat and mass transfer behavior of pool boiling in LiBr/H2O absorption chiller generator considering different tube surfaces

et al. 2021

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Investigating the pool boiling process in the absorption chiller generator by studying the valid parameters may enhance the chiller's coefficient of performance (COP). In the present study, the transient two-dimensional numerical modeling of LiBr/H2O solution pool boiling in the generator of the absorption chiller was carried out using the two-phase Eulerian- Eulerian approach, extended Rensselaer Polytechnic Institute (RPI) boiling model and renormalization group (RNG) K-? turbulence model. The numerical model was applied on three types of the bare, notched fin, and low fin tubes to investigate the effect of using fin on the boiling heat transfer rate in the generator of the absorption chiller and comparing it with the bare tube. Moreover, the numerical results were compared with the data obtained from the previous experimental studies to validate numerical modeling. A good agreement was achieved between numerical and experimental results. The results showed the evaporation mechanisms in the microlayer, evaporation in the three-phase (liquid-vapor-solid) contact line, and transient conduction to the superheat layer for constant thermal heat flux and the three surfaces of the copper tube within a specific period from the boiling point of LiBr/H2O solution. The results also showed that the use of a notched fin-tube and low fin tube increases the non-homogeneous nucleation rate, causes the solution to boil earlier than the bare tube, and reduces the required thermal energy in the generator of an absorption chiller.

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“…play a critically important role both in theoretical study of two-phase flow and in state-of-the-art CFD-Computational Fluid Dynamics models. The local and average interfacial area concentration which is one of the most important parameters in the modelling of two-phase flows can be calculated by using void fraction and bubble size [7,8]. In order to measure these parameters, optical visualization which is also a non-intrusive method is one of the widely used measurement methods besides other intrusive methods such as local optical probe, hotwire probe etc.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Bubbly Two-Phase Flow in a Vertical Pipe Using Ultrasonic Velocity Profiler and Digital Optical Imaging

Thang

2023

I2M

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In this study, a novel measurement framework for two-phase air-water bubbly flow has been developed. It consists of ultrasonic and digital optical imaging systems. The measured parameters include instantaneous velocity profiles of the two phases, void fraction and bubble size of the gas phase. The simultaneous velocity profiles of both phases are measured by the state-of-the-art multiwave Ultrasonic Velocity Profile methodmultiwave UVP for short. The void fraction and bubble size are measured by a digital imaging system that exploits high-speed video imaging. Non-intrusive measurement of these instantaneous flow parameters is still a challenge in two-phase flow study. In the present investigation, two ultrasonic signal processing algorithms have been implemented and tested, namely Doppler signal processing and correlation one. Similarly, rigorous digital image processing algorithms implemented in ImageJ tool have been exploited and tested to obtain the average void fraction and bubble size distribution. Furthermore, measurements and analyses have been carried out for various flow conditions. For the particular flow configuration investigated, important experimental data of the two-phase counter-current bubbly flow have been successfully obtained for the first time. The measured data are useful for both experimental and numerical analyses, especially computational fluid dynamics -CFD analyses, of two-phase flows.

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A CFD Modeling of Subcooled Pool Boiling

Cited by 4 publications

References 18 publications

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Numerical study on heat and mass transfer behavior of pool boiling in LiBr/H2O absorption chiller generator considering different tube surfaces

Measurement of Bubbly Two-Phase Flow in a Vertical Pipe Using Ultrasonic Velocity Profiler and Digital Optical Imaging

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