Article
Thermodynamics
Hesham Gaballa, Sajad Jafari, Chaouki Habchi, Jean-Charles de Hemptinne
Summary: This study proposes a real-fluid model for two-phase flow in dual-fuel internal combustion engines, aiming to investigate the evaporation and mixing processes of renewable fuels. The model is applied to analyze the evaporation of n-dodecane in a mixed ambient, showing that increasing methanol concentration reduces the droplet lifetime. Thermodynamic analysis reveals different thermodynamic paths for the droplet under varying methanol concentrations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Zheng Qiao, Yu Lv, Jean-Pierre Hickey
Summary: The study focuses on the single-phase instability of high-pressure, steady, laminar counterflow diffusion flame, with specific emphasis on the middle branch solutions characteristic of intermediary combustion states. The combustion states are influenced by operating pressure and inlet temperature, while the size and location of instability regions in the flame are determined by water vapor concentration and temperature.
Article
Engineering, Chemical
Milada L. Pezo, Lato Pezo, Danka Dragojlovic, Radmilo Colovic, Dusica Colovic, Strahinja Vidosavljevic, Miroslav Hadnadev, Olivera Duragic
Summary: Experiments were conducted on five types of fluids in food/pharma/animal feed applications, showing that the nozzle diameter has a significant impact on the spreading characteristics of the jet, while temperature affects the liquid viscosity, with higher temperatures leading to increased spreading angle and liquid expansion.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Thermodynamics
Hengjie Guo, Roberto Torelli
Summary: A unified non-equilibrium phase change model considering the vapor-liquid equilibrium of multicomponent mixtures is proposed, overcoming the limitations of the original homogeneous relaxation model. Simulation results show that the unified model performs better in predicting mixing-driven vaporization and evaporative cooling compared to the original model, and it accurately predicts mixture composition and vaporization rate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Farid A. Hammad, Kai Sun, Zhizhao Che, Jan Jedelsky, Tianyou Wang
Summary: Despite its wide industrial applications, the internal-mixing twin-fluid atomization suffers from unstable spray. This study linked the flow characteristics inside a newly designed atomizer with spray stability and quality. By proposing a new parameter and flow regime map, the optimized atomizer can overcome spray unsteadiness and is suitable for applications requiring high spray stability and quality.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Heyong Si, Lihua Cao, Pan Li, Dongchao Chen
Summary: A three-dimensional simulation model of multi-stage high temperature and pressure reducing valve was established, and the effects of water spray parameters on the flow characteristics and thermodynamic loss were analyzed. The results showed that factors such as droplet size, injection velocity, and temperature significantly influenced the performance of the reducing valve.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Multidisciplinary Sciences
Chengting Liu, Liang He
Summary: A new supersonic atomization drainage gas recovery technology was developed to improve recovery rate, with established models and neural networks for predicting droplet size accurately. Experimental results demonstrate high accuracy and successful application in increasing natural gas recovery efficiency.
SCIENTIFIC REPORTS
(2022)
Article
Pharmacology & Pharmacy
Mathew N. Leslie, Nirmal Marasini, Zara Sheikh, Paul M. Young, Daniela Traini, Hui Xin Ong
Summary: A central characteristic of emphysematous progression is the continuous destruction of the lung extracellular matrix (ECM). Our study aims to repurpose Nitrofurantoin (NF) as an inhalable therapeutic strategy to upregulate ECM expression, thereby reversing the disease progression within the emphysematous lung. Spray-dried (SD) formulations of NF were prepared using different nozzles (2FN and 3FN) and characterized for their physicochemical properties and efficacy on human lung fibroblasts. The 2FN formulation displayed better aerodynamic properties and higher drug release, leading to significantly enhanced ECM protein expression compared to the 3FN formulation.
Article
Nanoscience & Nanotechnology
Olivier J. J. Ronsin, DongJu Jang, Hans-Joachim Egelhaaf, Christoph J. Brabec, Jens Harting
Summary: In solution processing of thin films, the evaporation kinetics of fluid mixtures play a crucial role in determining the final morphology and properties of the film. A new phase-field model is proposed to simulate the evaporation kinetics of these mixtures, focusing on local liquid-vapor equilibrium and diffusion at the film surface. The simulations show that the evaporation rate is time-dependent for mixtures due to changing composition, but can become almost constant for highly nonideal mixtures in certain conditions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Thermodynamics
Marco Ferrando, Alberto Traverso, Vishnu Sishtla
Summary: The need to increase efficiency in heat pumps requires refined design of various system components. Technologies such as ejectors and turbines can replace the throttling valve in reverse cycles to improve system performance. Supersonic convergent-divergent nozzles are commonly used in two-phase turbines and ejectors to accelerate the refrigerant fluid. This paper presents a new statistical approach based on the Massflow Factor parameter to accurately determine the critical mass flow rate for CO2 as a refrigerant fluid.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Mechanics
Hesham Gaballa, Chaouki Habchi, Jean-Charles de Hemptinne
Summary: Numerical modeling of high-pressure liquid fuel injection is challenging. A fully compressible multi-component two-phase real-fluid model with a diffused interface is proposed, together with a surface density equation for fuel atomization modeling. The proposed model shows accurate predictions and computational efficiency.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Automation & Control Systems
Sergei Klinkov, Vladimir Kosarev, Vladislav Shikalov, Tomila Vidyuk
Summary: Traditionally, supersonic de Laval nozzles are used for coating deposition and additive manufacturing by cold spray. However, using other configurations of the prechamber-nozzle units, such as the ejector nozzle, can expand the technological capabilities of cold spray. This study investigates the possibility of using the ejector nozzle under high-pressure cold spray conditions and compares the characteristics of copper coatings deposited using the ejector and de Laval nozzles on aluminum alloy substrates. The results show that coatings obtained with the ejector nozzle have lower thickness, higher porosity, and similar microhardness compared to coatings obtained with the de Laval nozzle. This development can be beneficial when a technological simplicity of the cold spraying process is desired.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Antoine Marie, Mallorie Tourbin, Anne-Charlotte Robisson, Carine Ablitzer, Christine Frances
Summary: Spray drying without any binder was carried out using two-fluid or ultrasonic nozzle technology to produce alumina powders of different sizes and/or specific surface area. The results showed that the ultrasonic nozzle had better ability to form agglomerates and increase their size compared to the two-fluid nozzle under the same operating conditions. The initial state of the powder was found to play a dominant role in both size characteristics and redispersion properties during spray drying.
CERAMICS INTERNATIONAL
(2022)
Article
Thermodynamics
Yuanzheng Lv, Guodong Xia, Lixin Cheng, Dandan Ma
Summary: Experiments were conducted in two parallel rectangular multi-microchannels using HFE-7100 for flow boiling, revealing significant differences in heat flux and pressure drop under different aspect ratios, with the minimum heat flux decreasing as the aspect ratio decreases. The physical mechanisms of unstable vapor liquid two phase phenomena were analyzed based on a simplified mathematical model, suggesting that a wide flat regime in the hydrodynamic curves may decrease such phenomena.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Physics, Multidisciplinary
Anastasia V. Frolkova
Summary: The study of topological invariants allows for the development of a qualitative theory of the processes being researched, which can predict the behavior of a whole system by studying the properties of objects in the same equivalence class. This paper describes several topological invariants in various equilibrium diagrams, highlighting their properties and how they can be used to differentiate equivalence classes of phase diagrams. Additionally, the balance equation of singular-point indices based on the Euler characteristic is used to analyze the binodal-surface structure of a quaternary system.
Article
Engineering, Multidisciplinary
Chawki Habchi
ATOMIZATION AND SPRAYS
(2015)
Article
Engineering, Multidisciplinary
Bejoy Mandumpala Devassy, Chawki Habchi, Eric Daniel
ATOMIZATION AND SPRAYS
(2015)
Article
Engineering, Chemical
Vahid Ebrahimian, Andre Nicolle, Chawki Habchi
Article
Engineering, Multidisciplinary
Chawki Habchi
ATOMIZATION AND SPRAYS
(2011)
Article
Thermodynamics
V. Ebrahimian, C. Habchi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2011)
Article
Engineering, Aerospace
Chawki Habchi, Vahid Ebrahimian
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2012)
Article
Energy & Fuels
C. Habchi
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
(2010)
Article
Mechanics
Ping Yi, Songzhi Yang, Chaouki Habchi, Rafael Lugo
Article
Mechanics
Songzhi Yang, Chaouki Habchi
Article
Energy & Fuels
Sajad Jafari, Hesham Gaballa, Chaouki Habchi, Jean-Charles de Hemptinne
Summary: The accurate, robust, and efficient simulation of fuel jets has long been a challenge for researchers. In this study, a new tabulated multi-component real-fluid model (RFM) and modified numerical schemes were applied to simulate various jet mixing cases and compared with experimental data, showing satisfactory agreement.
Article
Thermodynamics
Chaouki Habchi
Summary: This paper aims to clarify the state of the art in the three-dimensional simulation of boiling of liquid films and spray droplets during their contact with hot substrates. Based on recent experimental and theoretical research, a set of heat transfer models for three-dimensional simulation of spray cooling considering conjugate heat transfer is proposed. These models were implemented in a computational fluid dynamics solver and validated using experimental data.
HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Hesham Gaballa, Chaouki Habchi, Jean-Charles de Hemptinne
Summary: Numerical modeling of high-pressure liquid fuel injection is challenging. A fully compressible multi-component two-phase real-fluid model with a diffused interface is proposed, together with a surface density equation for fuel atomization modeling. The proposed model shows accurate predictions and computational efficiency.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Proceedings Paper
Thermodynamics
C. Habchi, N. Lamarque, J. Helie, S. Jay
28TH CONFERENCE ON LIQUID ATOMIZATION AND SPRAY SYSTEMS, ILASS-EUROPE 2017
(2017)
Proceedings Paper
Physics, Applied
Chawki Habchi, Julien Bohbot, Andreas Schmid, Kai Herrmann
9TH INTERNATIONAL SYMPOSIUM ON CAVITATION (CAV2015)
(2015)
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
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
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)