Article
Mechanics
Jiang Huang, Licheng Sun, Zhengyu Mo, Yi Feng, Jingjing Bao, Jiguo Tang
Summary: The performance of Venturi-type bubble generators is heavily influenced by the throat size, with smaller throat sizes leading to more intense bubble deformation and breakup, resulting in the production of smaller and more uniform fine bubbles.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Engineering, Environmental
Xinyan Wang, Yun Shuai, Haomiao Zhang, Jingyuan Sun, Yao Yang, Zhengliang Huang, Binbo Jiang, Zuwei Liao, Jingdai Wang, Yongrong Yang
Summary: A novel swirl-venturi microbubble generator with tangential inlets was introduced in this study, showing three different breakup patterns and the dominance of static erosive breakup. The generator performs better at higher liquid velocities and the initial breakup location of bubbles is more concentrated near the wall in the swirl-venturi microbubble generator.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Qiang Li, Dezhi Ming, Mao Lei, Xu Guo, Jialin Liu, Haowei Zhu, Liang Fang, Zhenbo Wang
Summary: The mechanism of bubble breakup in a venturi-type bubble generator was studied through numerical simulation, revealing both steady-state and unsteady-state disturbed breakup patterns. The study also found that interfacial instability played a crucial role in different stages of bubble transport.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2022)
Article
Engineering, Chemical
Haiyan Bie, Yunxia Li, Licheng Xue, Yue Wang, Gang Liu, Zongrui Hao, Weizhong An
Summary: This study explores the dynamics and breakup phenomena of bubbles in a swirl-venturi bubble generator (SVBG). Two motion trajectories of bubbles are observed, and multiple types of breakup phenomena are identified. For high liquid Reynolds numbers, vortex flow regions expand and bubble size decreases. It is notable that the number of microbubbles increases significantly under intensive swirling flow.
Article
Engineering, Chemical
Weiwen Wang, Xiaoxu Zhang, Chaojie Li, Yuanqiang Zou, Guiyong Li, Yekui Chen, Guanghui Chen, Jihai Duan
Summary: In this study, a novel porous Venturi structure was proposed to enhance mass transfer. The velocity variation and flow field distribution inside the Venturi channel were revealed using the volume of fluid model, and the motion pattern between multiple bubbles and the bubble fragmentation process were studied using the particle image velocimetry system. The results showed that the novel self-priming Venturi tube improved the flow field and mass transfer efficiency compared to traditional self-priming Venturi tubes, and further investigation of the porous structure variables provided a new idea for enhanced bubble fragmentation.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Guodong Ding, Zhenlin Li, Jiaqing Chen, Xiaolei Cai
Summary: This paper presents a new venturi bubble generator design, with results showing a significant increase in bubble foaming frequency with water flow rate and insensitivity to air flow rate. Bubbles in the venturi channels experience collapse or breakup, with a decrease in Sauter mean diameter in divergent outlets. Water Reynolds numbers have a significant effect on bubble breakup characteristics.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Mechanics
Yan Pang, Yao Lu, Xiang Wang, Zhaomiao Liu
Summary: The study found that in a rectangular microchannel with a T-junction, droplet behavior can be categorized into three modes: flow into the side branch, split at the junction, and flow into the downstream channel. The size of the droplet and flow conditions affect the changes in flow rate ratio and pressure difference.
Article
Biochemical Research Methods
Yu Chang, Lin Sheng, Junjie Wang, Jian Deng, Guangsheng Luo
Summary: By establishing a universal database and model, we have developed a neural network model that combines mechanistic and data modeling to predict and design the performance of gas-liquid microdispersion. We have also proposed a design method that controls the deviation of bubble size to be less than 5%.
Article
Mechanics
Majid Rodgar, Helene Scolan, Jean-Louis Marie, Delphine Doppler, Jean-Philippe Matas
Summary: The study experimentally examined the behavior of a bubble injected into a horizontal liquid solid-body rotating flow, showing how factors such as bubble size, rotation speed, and buoyancy impact the bubble's aspect ratio and movement. The study also found that at certain extreme conditions, such as when the Reynolds number exceeds 3000, the bubble can experience abrupt transitions and potentially break up due to resonance between the periodic forcing of the rotating cell and the eigenmodes of the stretched bubble.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Declan B. Gaylo, Kelli Hendrickson, Dick K. P. Yue
Summary: This study focuses on the evolution of the bulk bubble-size distribution under the influence of turbulence-induced fragmentation and free-surface entrainment, finding two regimes based on the entrainment distribution dependence. The weak injection regime is independent of the entrainment distribution, while the strong injection regime's power-law slope is determined by gamma.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Chemical
Yun Shuai, Xinyan Wang, Zhengliang Huang, Jingyuan Sun, Yao Yang, Zuwei Liao, Jingdai Wang, Yongrong Yang
Summary: The study captured the bubble breakup in a jet bubbling reactor using a high-speed camera and measured the velocity field by particle image velocimetry. Two typical breakup patterns, jet breakup and jet-vortex breakup, were observed, with the latter having a significantly longer breakup time interval. Parameters such as bubble breakup frequency, average number of daughter bubbles, and daughter bubble size distribution were found to be related to factors such as bubble size and jet velocity.
Article
Engineering, Chemical
Yingjie Fei, Chunying Zhu, Taotao Fu, Xiqun Gao, Youguang Ma
Summary: The deformation of moving slug bubbles and its influence on the bubble breakup dynamics in microchannel were studied. Three bubble morphologies were observed: slug, dumbbell, and grenade shapes. The viscosity effect of the continuous phase aggravated the deformation of bubbles. The experimental results showed that the deformation of bubbles significantly prolonged the bubble breakup period.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Thermodynamics
Haixiao Liu, Tao Tian, Rong Kang
Summary: The gas-liquid two-phase structure of bubble flow is investigated by analyzing the motion and force states of bubbles. The most crucial bubble behaviors include the bubble collision and breakup, which continuously occur in the movement process of bubble flow. A novel theory of bubble breakup is established according to the probability field analyses of turbulent eddies.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Ocean
Arman Ghanavati, Sajad Khodadadi, Mohammad Hassan Taleghani, Mofid Gorji-Bandpy, Davood Domiri Ganji
Summary: In this study, the motion and interaction of a bubble pair rising in a stationary liquid were simulated using the volume of fluid method (VOF). Results showed that four different types of interactions, including coalescence, bouncing, zigzagging, and breakup, can occur between the bubble pair based on the Bond (Bo) and Morton (Mo) numbers. The velocity and drag force of the trailing bubble were found to depend on the separation distance between the bubbles and the wake effect of the leading bubble. A general criterion based on dimensionless numbers was proposed to determine the type of interaction between the bubble pair.
APPLIED OCEAN RESEARCH
(2023)
Article
Chemistry, Analytical
Xiaopeng Shang, Xiaoyang Huang
Summary: This work presents experimental and numerical studies on the dynamics of cavitation bubbles in a nozzle-shaped microfluidic channel with PZT actuations. It is found that a cloud of bubbles can be generated near the center of the microfluidic channel when the actuation voltage is larger than a threshold at 1 kHz. The bubbles oscillate radially with expansion and compression, and translate upstream towards the opening of the nozzle. The bubbles undergo frequent coalescence and breakup, leading to vigorous churning of surrounding liquids. Numerical simulation shows a low-pressure zone inside the microfluidic channel within each cycle of the actuation period, which is responsible for bubble generation observed in the experiments. The method of bubble generation in this study is novel and can be applied for the enhancement of heat and mass transfer in microfluidic operations.
Article
Environmental Sciences
J. Xu, J. Bao, H. Liu, J. Tang, G. Xie, L. Sun
Summary: Experiments conducted in a simulated wet flue gas desulfurization system showed that sulfite and slurry temperature are key factors affecting mercury migration and re-emission. pH value and atmosphere also play a role in influencing mercury behavior in the system.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Wei Tang, Licheng Sun, Hongtao Liu, Jiguo Tang, Jingjing Bao
Summary: The study examines the extendibility and heat transfer uniformity of the modified self-similar heat sink in cooling surfaces of varying sizes, demonstrating its superior performance compared to traditional designs.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2021)
Article
Thermodynamics
Jiguo Tang, Xiao Li, Rui Hu, Zhengyu Mo, Min Du
Summary: The novel manifold ultrathin micro pin-fin heat sink (MUMPFHS) cooling technique developed in this study shows significant advantages in achieving uniform solar cell temperature and high cooling performance under high solar concentration. The simulation results indicate that the designed MUMPFHS can enhance the feasibility of using HCPV under higher solar concentration for safe operation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
He Ruan, Heping Xie, Jun Wang, Jiaxi Liao, Licheng Sun, Mingzhong Gao, Cunbao Li
Summary: In this study, a fluid-thermalelectric multiphysics coupled model is developed to investigate the enhancement effects of graphene nanoplatelets (GNPs) nanofluids on both thermoelectric generator (TEG) and thermoelectric cooler (TEC) systems. The research found that the performance improvements increase significantly with higher nanoparticle concentrations but decrease as Reynolds number decreases.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Wei Yang, Licheng Sun, Jiguo Tang, Zhengyu Mo, Hongtao Liu, Min Du, Jingjing Bao
Summary: The intrinsic activity of hydrogen evolution reaction (HER) catalysts has been significantly improved, but the complex interactions among electrochemical reaction, ion transport, bubble behavior, and gas-liquid flow near the electrode surface make it difficult to analyze their individual effects. In this paper, a multiphase fluid dynamics and mass transport model is proposed to decouple the HER processes and provide a deep understanding on the interactions among those processes.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Biophysics
Yunfei Ling, Torsten Schenkel, Jiguo Tang, Hongtao Liu
Summary: The blood flow characteristics in patient-specific double aortic arches were investigated using computational fluid dynamics. It was found that the blood flow distribution and energy loss of double aortic arch depend on the relative sizes and angles of the two arches. Ligation of the arch increases energy loss and cardiac workload.
JOURNAL OF BIOMECHANICS
(2022)
Article
Thermodynamics
Xiao Li, Jiguo Tang, Rui Hu, Licheng Sun, Jingjing Bao
Summary: In this study, the convection near an oscillating vapor film and its contribution to Microbubble Emission Boiling (MEB) were investigated experimentally and numerically. The results showed that the convection near the vapor film was enhanced after MEB occurrence. Numerical simulations demonstrated that the oscillation of the vapor film significantly improved the surrounding convection and heat transfer.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Jiguo Tang, Rui Hu, Hongtao Liu, Zhengyu Mo, Licheng Sun
Summary: Bubble condensation is an important phenomenon in subcooled boiling, and studying its mechanism can improve the understanding of heat transfer in this process. The study found that at high subcooling and low stand-off distance, a condensing bubble can induce a liquid jet, increasing the condensation rate. The velocity caused by bubble condensation is lower than that caused by cavitation but higher than natural and Marangoni convections, potentially enhancing subcooled boiling.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Wei Yang, Licheng Sun, Jingjing Bao, Zhengyu Mo, Min Du, Jun Li, Jun Zhang
Summary: Widespread use of fossil fuels has led to environmental issues and an energy crisis. Electrochemical CO2 reduction using carbon neutral energy sources is a promising solution. However, the complex interactions among multiple physical/chemical processes make it challenging to analyze the effect of each process on electrode performance through experimental methods. This study develops a two-phase flow and mass transport model to analyze the interplays among these processes.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Wei Yang, Licheng Sun, Jingjing Bao, Zhengyu Mo, Jun Li, Jun Zhang
Summary: In this paper, a two-phase flow and mass transport model is developed for hydrogen evolution reaction (HER) under near-neutral pH condition. The study finds that the homogeneous reaction of the buffer significantly facilitates the transport of H+ and OH(-), improving the performance of the HER. It is concluded that the phosphate/bicarbonate buffer and two-phase flow concurrently contribute to the improvement of ion transport and HER performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Wei Yang, Licheng Sun, Jingjing Bao, Zhengyu Mo, Min Du, Yong Xu, Jun Zhang
Summary: This study investigates the interactions between heat/mass transport and electrochemical reaction in liquid-state thermo-electrochemical cells (TECs) using a multiphysics model. The results demonstrate the strong interplays among heat transfer, electrolyte flow, ion transport, and electrochemical reactions, which determine the overall performance of TECs. The study also highlights the tradeoff between enhancing ion transport and inhibiting heat transfer for optimal TEC design in practical applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Thermodynamics
Heping Xie, Tianyi Gao, Xiting Long, Licheng Sun, Jun Wang, Entong Xia, Shuheng Li, Biao Li, Cunbao Li, Mingzhong Gao, Zhengyu Mo
Summary: This study designed and tested a modular 1 kilowatt-level thermoelectric generator (TEG) system, and the experimental results validated the feasibility of modular technology and highlighted its potential for medium-low temperature geothermal energy application.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Zafar Hayat Khan, Rashid Ahmad, Licheng Sun, Waqar Ahmed Khan
Summary: This study incorporates a time-dependent condensation model in a porous medium, taking into account variations in liquid and vapor densities as well as variable heat generation. By employing an Adaptive Moving Mesh Method, the dimensionless two-phase model and the heat jump condition were solved, resulting in an unsteady liquid-vapor phase change front with internal heat variations.
EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW
(2022)
Review
Thermodynamics
Jiguo Tang, Licheng Sun, Hongli Liu, Hongtao Liu, Zhengyu Mo
Summary: This study reviews the literature on interfacial heat transfer and bubble dynamics in the process of bubble condensation. The correlations for bubble condensation are analyzed and evaluated, and the investigations addressing bubble dynamics are reviewed. Despite the extensive experiments available, there is still a shortage of research focusing on the thermal boundary layer and turbulence near the bubble at the micro-scale, as well as the transportation of noncondensable gas and the effect of capillary waves on the vapor-liquid contact area.
EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW
(2022)
Article
Thermodynamics
Cong Li, Jiali Wang, Chenhui Wang, Yanke Jin, Yina Yao, Rui Yang
Summary: This study investigates the impact of NaCl water droplets with various concentrations on a heated surface. The results show that the impact patterns can be categorized into different types, and models are established to predict the spreading behavior of droplets with different concentrations. Additionally, high concentration droplets exhibit more violent boiling and have lower residual energy and rebound time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
C. Barrera, V. Castro, F. Escudero, J. J. Cruz, I. Verdugo, J. Yon, A. Fuentes
Summary: This study focuses on the characterization of soot maturity and sooting propensity of anisole fuel in a controlled laminar coflow diffusion flame. The results show that the spatial distribution of soot volume fraction is enhanced near the flame centerline, while soot production is promoted near the flame wings. The temperature increase also affects the maturity of soot particles.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Roman W. Morse, Jason Chan, Tiago A. Moreira, Jared J. Valois, Evan T. Hurlburt, Jean-Marie Le Corre, Arganthael Berson, Kristofer M. Dressler, Gregory F. Nellis
Summary: This study investigates the dryout of liquid film and the role of disturbance wave frequency. Experimental results indicate that the heat transfer coefficient associated with optimal boiling conditions is maximized when the surface is dry 5% of the time, independent of pulse amplitude and frequency. Liquid-film measurements, dryout statistics, and direct observation suggest that disturbance-wave frequency can be manipulated by density-wave oscillations in the flow field.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
E. J. Vega, J. M. Montanero
Summary: In this study, we experimentally investigated the bursting of a bubble covered with a surfactant. We found that the bubble bursting time is longer compared to a surfactant-free bubble due to interfacial elasticity. Furthermore, the Marangoni stress drives liquid flow that allows the jet to escape from the end-pinching mechanism within a certain surfactant concentration range.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Guofu Sun, Yi Zhan, Tomio Okawa, Mitsuhiro Aoyagi, Akihiro Uchibori, Yasushi Okano
Summary: Experiments were conducted on liquid jets ejected from oval nozzles to investigate the effects of nozzle orifice shape on jet behavior. The study found that the liquid jet exhibited different characteristics at different liquid flow rates. Correlations were established to predict the liquid jet state and characteristics of the secondary droplets produced during jet impact onto a solid surface. This research extended the available knowledge on liquid jet behavior.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Jeonghoon Lee, Laurent Zimmer, Takeshi Saito, Shinji Nakaya, Mitsuhiro Tsue
Summary: This study investigates the effects of spatial resolution on DMD amplitudes and spatial mode strengths, and proposes scaling factors to correct for the resolution differences. The results show that the proposed scaling factors successfully normalize the amplitudes and spatial modes, allowing for quantitative comparison of data obtained with different spatial resolutions. This study is significant for analyzing spatiotemporal data in various fields.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yanli Zhao, Shibing Kuang, Xiaoliang Zhang, Mingjun Xu
Summary: This study experimentally investigates the dynamic process of water droplet impacting different wood surfaces and analyzes and discusses the impacting phenomena, phenomena distribution, droplet spreading dynamics, and maximum spread factor. The results show that the impacting process can be distinguished by Weber numbers and Reynolds numbers, and can be predicted by mathematical expressions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Aakhash Sundaresan, Atul Srivastava, Callum Atkinson
Summary: This study presents the first-ever application of an advanced methodology, combining two-color laser-induced phosphorescence and particle image velocimetry, to investigate the heat transfer mechanisms on the surface of a cylinder placed inside a confined square duct. The technique allows for simultaneous measurement of velocity and temperature fields, reducing the complexity and costs associated with separately measuring temperature distributions. Experimental observations show that increasing the mass flow rate enhances heat removal from the cylinder surface, and increasing the cylinder heat input enhances heat transfer in the rear portion of the cylinder.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Harish K. Patel, Sukhjeet Arora, Rutuja Chavan, Bimlesh Kumar
Summary: This study experimentally analyzed the multiscale statistical assessment of scour depth surrounding spur dikes with downward seepage. The research found that seepage affects the morphological behavior and hydrodynamic characteristics of the channel bed, leading to changes in scour formation. The rate of scour depth changes initially increases with higher seepage velocity but eventually becomes constant over time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Justas Sereika, Paulius Vilkinis, Gediminas Skarbalius, Algis Dziugys, Nerijus Pedisius
Summary: This study experimentally investigated the pulsatile flow structure based on a transitional-type cavity. It was found that the pulsation amplitude has a more significant effect on the dynamics of recirculation zone than the pulsation frequency. Pulsatile flow can reduce the size of the recirculation zone.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Merav Arogeti, Eran Sher, Tali Bar-Kohany
Summary: This study provides a detailed exploration of the events that occur when a droplet hits a dry solid surface of various small sizes, with a focus on the deposition, receding breakup, and prompt splash phases. By utilizing non-dimensional analysis and graphical representation, the boundaries between different events are defined, and criteria for differentiation based on target-to-drop ratio, Reynolds, and Webber numbers are presented.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Tianxiong Li, Fei Wen, Yingchun Wu, Botong Wen, Lei Wang, Jinxin Guo, Xuecheng Wu
Summary: This study investigates the structure of the flow field induced by a strut in a scramjet and its influence on flame stabilization. Experimental and numerical analyses reveal that the flow field exhibits features beneficial for flame stabilization, but the asymmetry of the flow poses a challenge to flame establishment.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Syed Ehtisham Gillani, Yasir M. Al-Abdeli
Summary: This study investigates the asymmetry in bluff-body stabilised annular jets and finds that swirl can significantly mitigate the asymmetry and restore the symmetry of the jets. Moreover, increasing the Reynolds number and the swirl intensity can both decrease the asymmetry of the jets.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Utsav Bhardwaj, Rabindra Kumar, Shyama Prasad Das
Summary: This study presents an experimental investigation on flooding phenomenon in a pulsating heat pipe (PHP) unit cell, and analyzes the impact of flooding on the performance of PHP. The study recognizes three different flooding mechanisms and finds that currently accepted correlations for predicting flooding velocity are inaccurate. The study emphasizes the need for further research on flooding in PHPs.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yunpeng Xue, Yongling Zhao, Shuo-Jun Mei, Yuan Chao, Jan Carmeliet
Summary: This study investigates the impact of building morphology on local climate, air quality, and urban microclimate. The researchers conducted an experimental investigation in a large-scale water tunnel, analyzing heat and flow fields using Laser-induced Fluorescence (LIF) and Particle Image Velocimetry (PIV). The findings show that factors such as canyon configuration, buoyant force, and approaching flow magnitude significantly influence fluid flow in street canyons, and the morphology of the street canyon dominates ventilation rate and heat flux. For example, changing the aspect ratio of a street canyon can lead to a significant change in air ventilation rate, ranging from 0.02 to 1.5 under the same flow conditions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
