Article
Mechanics
W. Liu, H. Hassanzadeh, F. Larachi, S. M. Taghavi
Summary: We experimentally investigate buoyant immiscible displacement flows in a rotating pipe and analyze key flow features using image processing and ultrasound Doppler velocimetry techniques. The emergence of heavy fluid fronts and the effect of rotation speed on the displacement flows are observed. Dimensional analysis reveals that the displacement flow is governed by four dimensionless parameters. The classification of flow regimes and interfacial instabilities are achieved, and the Kelvin-Helmholtz instability is found to be the main interfacial instability. The velocity fields in stationary and rotating pipes are found to have remarkable differences, and the Fourier transform approach provides a preliminary understanding of concentration waves and amplitudes.
Article
Thermodynamics
Hedilberto A. A. Barros, Romulo L. P. Rodrigues, Rafael F. Alves, Cristiane Cozin, Hendy T. Rodrigues, Roberto da Fonseca Jr, Marco J. da Silva, Moises A. Marcelino Neto, Rigoberto E. M. Morales
Summary: This study presents experimental research on gas-liquid two-phase slug flow pattern in pipes with slight direction change. The study found that slug flow tends to modify itself by changing its features or transitioning to another flow pattern. Three different phenomena of slug dissipation were observed: gas plug, stratification, and wave flooding.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Acoustics
Yun-Long Zhou, Lie-Dong Mi, Mei Yang
Summary: This paper investigates the free vibration and stability of inclined pipes conveying gas-liquid slug flow, taking into account the intermittency of slug flow and gravity effects. A new lateral motion model is established based on stable slug flow dynamics and Euler-Bernoulli beam vibration models. The study comprehensively explores the natural frequencies, critical gas velocities, and responses to flow conditions, shedding light on the dynamic characteristics of inclined pipes. The results show that the gravity effects caused by the inclined angle significantly influence the vibration characteristics. The study contributes to understanding the complex dynamic behavior of inclined pipes conveying slug flow and promoting pipeline safety.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Chemistry, Multidisciplinary
Shuzhe Shi, Guoqing Han, Ziyao Zhong, Zhun Li
Summary: This study focused on two-phase slug flow in curved pipes, with experimental results showing that slug length is influenced by pipe curvature, inflow angle, and gas-liquid velocity ratio. A dynamic slug flow model was used to simulate well completion and throttle cases, demonstrating that large-scale segregated completion and reduced throttle opening lead to decreased flow instability.
Article
Thermodynamics
Mariana M. Grigoleto, Carlos L. Bassani, Marco G. Conte, Cristiane Cozin, Fausto A. Barbuto, Rigoberto E. M. Morales
Summary: A new set of equations for predicting the temperature distribution of gas-liquid slug flows is proposed, avoiding non-physical oscillations found in previous equations. The temperature is now assigned to the whole unit cell instead of each structure individually. Comparison with experimental data showed deviations of +/- 25% for temperature and pressure gradients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Himanshu Mishra, Anubhab Roy, S. Vengadesan
Summary: This study investigated the linear stability characteristics of a two-layered liquid-liquid flow in an inclined channel with slippery walls. The role of wall slip on the multiple base states associated with each holdup solution was analyzed. It was found that the wall slip could have both stabilizing and destabilizing effects depending on the flow rates and the value of holdup-the location of an interface.
Article
Mechanics
Li-song Wang, Shuo Liu, Lin-tong Hou, Meng Yang, Jian Zhang, Jing-yu Xu
Summary: This study introduces a simplified model and a unified model for predicting the critical gas velocities of film reversal. The simplified model offers a balance between simplicity and high accuracy, while the unified model considers more details and is more rigorous, aiding in understanding the mechanism of film reversal.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Engineering, Mechanical
Gabriel Soto-Cortes, Eduardo Pereyra, Cem Sarica, Carlos Torres, Auzan Soedarmo
Summary: Slug flow is a common gas-liquid flow pattern in pipes, and its characteristics play a crucial role in engineering processes. This paper presents a new signal processing analysis method that utilizes statistical algorithms to accurately determine slug flow characteristics, with validation from experimental data showing good results. The proposed algorithm is recommended for slug flow characterization based on its performance against the experimental data.
FLOW MEASUREMENT AND INSTRUMENTATION
(2021)
Article
Energy & Fuels
Huishu Liu, Jimiao Duan, Kecheng Gu, Jiang Li, Hao Yan, Jian Wang, Changjun Li
Summary: In this paper, a hydrodynamics unified modeling for gas-liquid two-phase slug flow is developed and the bubble and droplet entrainment is optimized. The correlations of important parameters are also optimized and parameters for liquid droplet and gas bubble entrainment are given. The results show that the double interface model (DIM) better describes the slug dynamics in gas-liquid pipe flow than the flat interface model (FIM).
Article
Mechanics
R. Baungartner, G. F. N. Goncalves, J. B. R. Loureiro, A. P. Silva Freire
Summary: Experiments on slug flow with various gas and liquid properties were conducted in a horizontal pipe. The rheological properties of the continuous phase were found to strongly affect the flow behavior, particularly the gas volume fraction, passage frequency of large bubbles, and pressure changes. New expressions for these parameters were proposed to account for the rheology of the liquid phase. The predictions of modified mechanistic models showed good agreement with the experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Mechanics
Adam Fershtman, Dvora Barnea, Lev Shemer
Summary: This experimental study investigates the interfacial structure of annular and stratified flows in both downward vertical and inclined pipes using a non-intrusive multilayer conductance liquid film sensor. The results show that pipe inclination and azimuthal angle have a significant impact on the asymmetric film distribution and complex interfacial structure. Different wave types co-exist in the flow and are influenced by parameters such as film coverage, thickness, and wave height. This study provides new insights into the wavy structure of separated flow in downward inclined pipes at low gas flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Chemistry, Analytical
Anna Yagodnitsyna, Alexander Kovalev, Artur Bilsky
Summary: This paper studies the immiscible liquid-liquid flow in a T-shaped microchannel, revealing the impact of shear-thinning on flow patterns and slug-flow features. Additionally, it demonstrates for the first time the influence of non-Newtonian dispersed phase on the transition from segmented to continuous flow.
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Geochemistry & Geophysics
Ruiquan Liao, Donghui Zhou, Zhihui Wang, Weixia Yang, Xingkai Zhang
Summary: Slug flow is a common flow pattern in the petrochemical industry that affects the normal operation of oil well surface pipelines and equipment, especially gas well multiphase flowmeters. This study presents a slug flow elimination device based on kinetic energy conversion to reduce its impact on gas-liquid two-phase measurements. The device's performance is evaluated through experiments and simulations, showing weakened flow rate and pressure fluctuations, a transition from intermittent slug flow to continuous flow, and a 20% prediction error in pressure drop calculation. This device provides a flow pattern basis for metering equipment and improves measurement accuracy, promoting multiphase metering technology.
Article
Geochemistry & Geophysics
Zilong Liu, Yubin Su, Ming Lu, Zilong Zheng, Ruiquan Liao
Summary: This paper conducted experiments on air and viscous oil two-phase flow and proposed a new pressure drop model for viscous oil-air two-phase churn flow in vertical pipes, which showed better performance in predicting pressure drop compared to existing models.
Article
Engineering, Chemical
Lele Yang, Jan Zhang, Yong Ma, Jingyu Xu, Jing Wang
CHEMICAL ENGINEERING SCIENCE
(2020)
Article
Engineering, Chemical
Lele Yang, Li Zou, Yong Ma, Jing Wang, Jingyu Xu
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
Energy & Fuels
Jun Niu, Shuo Liu, Jing-yu Xu
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Lin-tong Hou, Shuo Liu, Jian Zhang, Jing-yu Xu
Article
Environmental Sciences
Shiying Shi, Zhongliang Su, Liming Lin, Jingyu Xu, Yunteng He, Sheng Wang, Shijun Shi
JOURNAL OF COASTAL RESEARCH
(2020)
Article
Engineering, Chemical
Shuo Liu, Jian Zhang, Lin-tong Hou, Jing -yu Xu
Summary: The study investigated the variation regularity of characteristic droplet diameters in swirling flow field through experimental research and numerical simulations. The results revealed a bilinear relationship between the section average d(32) and the turbulent energy dissipation rate, a quadratic relationship between the section average d(90) and the swirling number, and a linear relationship between the d(5) and the swirling number. These characteristic droplet diameters were found to be sensitive to various operating parameters and oil properties.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Wenqi Ke, Lintong Hou, Lisong Wang, Jun Niu, Jingyu Xu
Summary: This study established a new model of liquid-film reversal in gas wells, considering the influences of pipe angle and friction coefficient of the gas-liquid interface. Experimental results showed that the interfacial shear force increases with the liquid superficial velocity, affecting the critical liquid-carrying gas velocity and production rate.
Article
Chemistry, Multidisciplinary
Wei An, Qingfan Zhang, Jianping Zhao, Liang Qu, Shuo Liu, Meng Yang, Jingyu Xu
Summary: The novel skimmer is able to effectively recover spilled oil on the sea surface and speed up the recovery process. The experimental results show a linear relationship between recovery efficiency and split ratio, and the oil content at the overflow port is influenced by spilled oil amount and split ratio.
Article
Mechanics
Li-song Wang, Shuo Liu, Lin-tong Hou, Meng Yang, Jian Zhang, Jing-yu Xu
Summary: This study introduces a simplified model and a unified model for predicting the critical gas velocities of film reversal. The simplified model offers a balance between simplicity and high accuracy, while the unified model considers more details and is more rigorous, aiding in understanding the mechanism of film reversal.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Engineering, Chemical
Nian-Hui Wan, Li-Song Wang, Lin-Tong Hou, Qi-Lin Wu, Jing-Yu Xu
Summary: A transient model using the finite difference method to simulate temperature and pressure in CO2 injection wells is proposed. The maximum error between simulated and measured results is 5.04%. The phase state is primarily controlled by the wellbore temperature, and increasing injection temperature or decreasing injection rate can help achieve the supercritical state.
Article
Engineering, Chemical
Lintong Hou, Dong Zhang, Meng Yang, Shuo Liu, Jingyu Xu
Summary: The flow characteristics and wall slip phenomenon of gas-liquid-solid mixtures in horizontal pipes were investigated. The critical liquid velocity for flow structure transformation was found to be between 0.75 and 1 m/s. The injection of gas reduced drag to a certain extent. However, the relative slip contribution increased and then decreased with an increase in the superficial gas velocity. The pressure gradient and wall slip velocity were sensitive to gas and liquid phase velocities, phase volume fraction, and pipe conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Mechanics
Jian Zhang, Yun-teng He, Shuo Liu, Jing-yu Xu
Summary: Cylindrical cyclones with a vortex finder are commonly used in the petroleum industry for oil-water separation. This study utilized dimensional analysis and multiphase flow numerical simulation to analyze the separation process in such cyclones. The results showed that the diameter of the overflow pipe, inlet velocity, and flow split ratio significantly influenced the structure of the vortex core. Increasing the diameter of the oil droplet improved the separation efficiency, while increasing the overflow split ratio decreased the oil volume fractions in the outlets.
Article
Energy & Fuels
Lele Yang, Lian Luo, Jing Wang, Jingyu Xu, Zhenfeng Zhai
Summary: This paper introduces a pressure control scheme for GLCC to achieve fast and stable gas-liquid separation. Experimental results show that increasing liquid superficial velocity only increases the distribution of small droplets, and the droplet size distribution at high dimensionless pressure is larger compared to that at low dimensionless pressure.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Applied
Jun Niu, Shuo Liu, Jing-Yu Xu
CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY
(2020)
Article
Engineering, Chemical
Shuo Liu, Jian Zhang, Li-Song Wang, Jing-Yu Xu
SEPARATION AND PURIFICATION TECHNOLOGY
(2020)
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)
