Chuang Wen

Chuang Wen
University of Exeter | UoE · College of Engineering, Mathematics and Physical Sciences

PhD

About

60
Publications
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1,209
Citations

Publications

Publications (60)
Article
The mitigation of CO2 emissions is an effective measure to solve the climate change issue. In the present study, we propose an alternative approach for CO2 capture by employing supersonic flows. For this purpose, we first develop a computational fluid dynamics (CFD) model to predict the CO2 condensing flow in a supersonic nozzle. Adding two transpo...
Article
Full-text available
This present study evaluates the potential of entraining the low-pressure hydrogen to fuel cell vehicles during fuelling processes, which is expected to promote the development of the hydrogen fuel automotive industry. A computational fluid dynamics model is developed to evaluate the potential of the proposed hydrogen fuelling process. A flow behav...
Article
Full-text available
This study develops a wet steam modelling to solve the phase change process inside the linear blade cascade of a steam turbine. The comparative study is carried out to understand the impact of the dry gas model and wet steam model on predicting the flow behaviours in a steam turbine. The effect of the cutback of the trailing edge on the flow struct...
Article
This research develops the non-equilibrium condensation model with sliding mesh technology to solve the unsteady condensing flow inside a 3D wet steam stage of steam turbine with transient rotor-stator interaction. The maximum fluctuation of time-dependent condensation parameters is predicted. The condensation loss and entropy generation considerin...
Article
The multi-effect distillation with thermal vapour compression (TVC) seawater desalination system provides an excellent energy-saving scheme by escalating the low-level energy. The internal mass and heat transfer in ejectors is an important element to improve efficiency. In this study, a visual mass transfer simulation model considering real thermod...
Article
Full-text available
The present study proposes the phase change material (PCM) as a thermal energy storage unit to ensure the stability and flexibility of solar-energy-based heating and cooling systems. A mathematical model is developed to evaluate the PCM melting process, considering the effect of nanoparticles on heat transfer. We evaluate the role of nanoparticles...
Article
Hydrogen socialization has become a promising target in future energy development. Hydrogen fuel cell vehicle is gradually becoming a considerable substitute for fossil fuel vehicles in many countries. As for the promotion of hydrogen fuel cell vehicles, The construction of facilities like hydrogen refueling stations and depots should be strengthen...
Article
Full-text available
The separation technology of carbon dioxide (CO2) is a key step to achieve high efficient carbon capture and storage targets. In the present study, we propose a new concept to remove CO2 from the offshore natural gas industry, which utilises the combined effect from nonequilibrium condensation phenomena in the supersonic flow and cyclonic separatio...
Article
Supersonic separator is a kind of natural gas dehydration device with great potential, but its internal mass and heat transfer process has not been fully studied. In this study, a novel three-field two-fluid model described by Eulerian-Eulerian approach for supersonic separator considering the heat and mass transfer between gas, liquid droplets, an...
Article
Full-text available
The formation and evaporation of nanodroplets in steam ejectors is neglected in many numerical simulations. We analyse the influence of a primary nozzle on steam ejector performances considering phase change processes. The numerical model is validated in detail against experimental data of supersonic nozzles and steam ejectors available in the lite...
Article
Atmospheric air is a popular working fluid in gas power plants and turbomachinery which always contains water vapor. The vapor condensation occurs in transonic flow when the temperature drops below dew point during the accelerating expansion and affects the performance of equipment and safety. The unsteady condensation model based on nucleation and...
Article
Full-text available
Massive droplets can be generated to form two-phase flow in steam turbines, leading to erosion issues to the blades and reduces the reliability of the components. A condensing two-phase flow model was developed to assess the flow structure and loss considering the nonequilibrium condensation phenomenon due to the high expansion behaviour in the tra...
Book
This book gathers selected papers from the 16th UK Heat Transfer Conference (UKHTC2019), which is organised every two years under the aegis of the UK National Heat Transfer Committee. It is the premier forum in the UK for the local and international heat transfer community to meet, disseminate ongoing work, and discuss the latest advances in the he...
Article
The present study evaluates the potential of clean natural gas dehydration using nonequilibrium condensations in high-pressure supersonic flows. A computational fluid dynamics model is developed to study the formation of massive nanodroplets due to the phase change process. The impact of thermodynamic models on nonequilibrium condensations in super...
Article
With the increasing importance of the environment, energy issues have become the focus of attention. Reducing exergy destruction of the ejector during mixing can increase the entrainment ratio and improve the refrigerating system working efficiency. In this study, a wet steam model integrating a droplet nucleation and growth formulas with four cate...
Article
The present study investigates the replacement of expansion valves, used in the cascade system of hydrogen fuelling stations, by a series of ejectors. The major advantage of using ejectors is to recover part of the kinetic energy lost during the expansion of a high-pressure primary flow, in order to entrain a lower pressure secondary flow; thus res...
Article
Full-text available
In steam turbine flow, the complex droplet spectrum caused by nonequilibrium condensation is necessary to be modeled accurately to predict the droplet behavior and estimate the exergy destruction and erosion rate. This study built and validated a polydispersed model with Quadrature method of moments (QMOM), consisting of transition SST model, the m...
Chapter
Turbulence modelling plays an important role in the numerical prediction of nonequilibrium condensations in transonic flows. The present study evaluates the effect of four different turbulence models, namely, k - ε standard, RNG, realizable, and k - ω SST, on the condensation behaviour in transonic flows considering shock waves. The numerical simul...
Chapter
Full-text available
The triangular fin is employed to enhance phase change material (PCM) performances inside triple tubes for latent heat thermal energy storages. The enhanced heat transfer characteristics are evaluated by computational fluid dynamics modelling. The computational simulation shows that the melting processes of PCM can be improved by triangular fins lo...
Chapter
Full-text available
Abstract Computational fluid dynamics modelling is developed to study steam condensations within turbine blades. The numerical result is validated against experimental data available in the literature. The comparison of pressure distributions at blade pressure and suction sides demonstrates that the numerical results agree well with experimental da...
Article
Full-text available
The multi-effect distillation with thermal vapour compression (MED-TVC) desalination system is efficient to produce freshwater. The steam ejector performance is not fully understood as the phase transition has been ignored in many studies. The present work develops a two-phase condensing flow model to assess the steam ejector performance considerin...
Conference Paper
Full-text available
The condensing flow model is developed to predict the non-equilibrium condensation of CO2 in a converging-diverging nozzle using computational fluid dynamics modelling, which is expected to contribute to the carbon capture and storage. The numerical result shows that the nucleation process of CO2 occurs in the downstream of the nozzle throat where...
Article
Full-text available
The supersonic separation offers an opportunity for natural gas processing. The problem is that the phase change of water vapour in the supersonic flow is not fully understood in the presence of shock waves in a supersonic separator. This study aims to evaluate the performance of the supersonic separation with the phase change process and shock wav...
Article
Full-text available
The single-phase and two-phase flow models are developed and compared for the performance evaluation of a steam ejector for the multi-effect distillation with thermal vapour compression (MED-TVC) seawater desalination system. The results show that a single-phase flow model with ignoring the phase change predicts an unphysical temperature of the ste...
Article
This paper focuses on the potential replacement of expansion valves in the fuelling process of hydrogen vehicle by use of ejectors. The main advantage of the ejectors is to exploit the kinetic energy of a high-pressure primary flow to entrain a lower pressure secondary flow resulting in an improved and efficient fuelling process. First, a one-dimen...
Article
Supersonic separation is a novel technology. A multi-fluid slip model for swirling flow with homogenous/heterogenous condensation and evaporation processes in the supersonic separator was built to estimate the separation efficiency. This model solves the governing equations of compressible turbulent gas phase and dispersed homogenous/heterogenous l...
Article
The sonic nozzle is commonly used in flow measurement. However, the non-equilibrium condensation phenomenon of moist air in the nozzle has a negative effect on the measuring accuracy. To investigate this complex phenomenon, the experiments on the oscillating condensation flow of moist air were conducted by an adjustable humidification apparatus wit...
Article
Full-text available
Sand transport through tubing and pipeline could cause a series of problems to flow assurance, if not properly managed or controlled. The most serious problem is the accumulation and erosion in multiphase flow pipelines and the surface equipment. Therefore, the importance of understanding the transport and deposition behaviour of sands through mult...
Article
In the steam turbine, the wetness loss due to vapor condensation is one of the most crucial losses at low-pressure stage. This study focused on entropy generation and exergy destruction of condensing steam flow in turbine blade with the roughness. The governing equations including entropy transport equation combined with condensation model, transit...
Article
Supersonic ejectors are of great interest for various industries as they can improve the quality of the low-grade heat source in an eco-friendly and sustainable way. However, the impact of steam condensation on the supersonic ejector performances is not fully understood and is usually neglected by using the dry gas assumption. The non-equilibrium c...
Article
The Volume of Fluid method and Re-Normalisation Group (RNG) k-ε turbulence model were employed to predict the gas-liquid two-phase flow in a terrain-inclined pipeline with deposited liquids. The simulation was carried out in a 22.5 m terrain-inclined pipeline with a 150 mm internal diameter. The flow parameters were numerically analyzed in detail i...
Article
Full-text available
The gas-liquid two-phase flow within a double inlet cyclone for natural gas separation was numerically simulated using the discrete phase model. The numerical approach was validated with the experimental data, and the comparison results agreed well with each other. The simulation results showed that the strong swirling flow produced a high centrifu...
Article
In the present work, the liquid slug formation in a hilly-terrain pipeline is simulated using the Volume of Fluid model and RNG k-ϵ turbulence model. The numerical model is validated by the experimental data of the horizontal slug flow. The influence of the pipe geometric structure and flow condition on the liquid slug formation is discussed includ...
Article
The supersonic separator is a novel technique to remove the condensable components from gas mixtures. But the particle behavior is not well understood in this complex supersonic flow. The Discrete Particle Method was used here to study the particle motion in supersonic flows with a strong swirl. The results showed that the gas flow was accelerated...
Article
In the present work, a set of static vanes are employed as the swirling flow generator in the supersonic separator for gas purification application. The computational fluid dynamics modeling is developed to optimize the vane structures. The numerical results show that the swirling flow is strengthened in the diverging part of the Laval nozzle due t...
Article
The condensation phenomenon of vapor plays an important role in various industries, such as the steam flow in turbines and refrigeration system. A mathematical model is developed to predict the spontaneous condensing phenomenon in the supersonic flows using the nucleation and droplet growth theories. The numerical approach is validated with the exp...
Article
The present work presents numerical simulations of the complex particle motion in a supersonic separator with a delta wing located in the supersonic flow. The effects of the delta wing on the strong swirling flow is analysed using the Discrete Particle Method. The results show that the delta wings re-compress the upstream flow and the gas Mach numb...
Article
The supersonic separator is a revolutionary device to remove the condensable components from gas mixtures. One of the key issues for this novel technology is the swirling fluid that is not well understood in the complex supersonic flows. A swirling device composed of an ellipsoid and several helical vanes is designed for an annular supersonic separ...
Article
Full-text available
The mass flow rate of natural gas through the supersonic separator was numerically calculated by various cubic equations of state. The numerical results show that the compressibility factor and specific heat ratio for ideal gas law diverge remarkably from real gas models at a high inlet pressure. Simultaneously, the deviation of mass flow calculate...
Article
Full-text available
A supersonic separator has been introduced to remove water vapour from natural gas. The mechanisms of the upstream and downstream influences are not well understood for various flow conditions from the wellhead and the back pipelines. We used a computational model to investigate the effect of the inlet and outlet flow conditions on the supersonic s...
Article
Full-text available
The supersonic separator is a novel compact tubular device for natural gas dehydration. The separation mechanism is not well understood for the complicated fluids with a delta wing located in the supersonic flows. We investigated the gas swirling separation characteristics in supersonic velocities using the Reynolds stress turbulence model. The res...
Article
Full-text available
Alternating current (AC) corrosion is a significant problem to metal structures in close proximity to alternating current carrying conductors. While for direct current (DC) interference there is large agreement on protection criteria to be used for corrosion mitigation, but the mechanism and relationship between AC density and corrosion rate are st...
Article
We proposed a novel supersonic liquefied technology to liquefy the natural gas to LNG liquids. The Peng-Robinson equation of state combined with a thermodynamic process modeling package was employed to calculate the gas dynamics parameters in the supersonic liquefied process. The method to intensify the liquefied process was also discussed. The res...
Article
The natural gas flow fields and particles separation characteristics were numerically calculated with the RNG k−ε turbulence model and Discrete Particle Method (DPM) in the supersonic swirling separator. An experimental system was set up for testing the separation efficiency of three new designed separators with wet air. The numerical results showe...
Article
Full-text available
Based on the conservation principle of angular momentum, we designed a new-style supersonic swirling separator equipped with a swirling device at the intake of the supersonic nozzle. Accordingly, an indoor experimental loop to test dehydration of this supersonic separator with moist air was set up, and effects of the pressure recovery coefficient o...
Article
Diffusers play a vital role in the supersonic separator to convert kinetic energy into pressure energy. The natural gas flows in diffusers were numerically calculated using the navier-stokes equations with the RSM (reynolds stress model). The behavior of gas dynamic parameters was analyzed under conditions of shock waves and boundary layers. The re...
Article
The effects of swirls on the mass flow rates and on the natural gas velocity and temperature in a supersonic separator were numerically studied using the Reynolds stress model. An experimental system was set up with moist air as working fluid. The results showed that high swirl strengths decreased the mass flow rates through the supersonic separato...
Article
Full-text available
The supersonic nozzle is a new apparatus which can be used to condense and separate water and heavy hydrocarbons from natural gas. The swirling separation of natural gas in the convergent-divergent nozzle was numerically simulated based on a new design which incorporates a central body. Axial distribution of the main parameters of gas flow was inve...

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Project (1)
Project
Dear Colleagues, With the help of 'Frontiers in Energy Research' a publication from Frontiers Media S.A., we launch a new Special Issue entitled: ‘Cleaner Treatment Technologies and Productions in Energy Industry’. This Special Issue aims to report the most important and latest technological advances in cleaner treatment technologies of fossil energy (such as oil and natural gas) and renewable energy (such as hydrogen energy and geothermal energy) and serves as a platform for addressing and discussing theoretical and practical cleaner production. The journal, an Open Access, with high visibility and an impact factor coming this year is a very good opportunity to demonstrate innovative proposals. Specific topics of interest include, but are not limited to, the following: • Cleaner production and technical processes for oil; • Dehydration, deacidification, and liquefaction of natural gas; • Oilfield wastewater treatment; • Advanced seawater desalination technology; • Storage and transportation of hydrogen and carbon dioxide; • Carbon capture and storage; • Storage and utilization of hydrogen energy; • Low-cost hydrogen production technology; • Utilization of geothermal energy; • Energy-saving technology; • Emission reduction technology. The Special Issue is Edited by Dr. Jiang Bian, Prof. Xuewen Cao, Dr. Chuang Wen, Dr. Lin Teng, and Dr. Zheng Li. More information in: https://www.frontiersin.org/research-topics/19330/cleaner-treatment-technologies-and-productions-in-energy-industry Please, contact us for any question.