Article
Thermodynamics
R. W. Morse, T. A. Moreira, J. Chan, K. M. Dressler, G. Ribatski, E. T. Hurlburt, L. L. McCarroll, G. F. Nellis, A. Berson
Summary: The experimental study characterizes the entire liquid-film dryout process in a vertical two-phase annular flow, showing that the dryout heat flux (DHF) is typically 90% of the critical heat flux (CHF), but can be as low as 50% of CHF at very high qualities. The investigation also reveals that the CHF occurs consistently at f(dry) approximate to 0.05.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Meisam Habibi Matin, Adam Kriz, Saeed Moghaddam
Summary: The annular flow regime in microchannels is characterized by the flow of a vapor core with a surrounding liquid film. However, the presence of temporal discontinuity in the liquid film coverage has raised questions about its physics. This study utilizes a microsensor array to investigate the thermohydraulic characteristics of the annular flow regime and intermittent surface dryout. The results show that evaporation rather than dewetting and film rupture is responsible for intermittent surface dryout. The study enhances the design and operation of two-phase heat sinks at high exit vapor qualities.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Goksel Yuncu, Yigit Akkus, Zafer Dursunkaya
Summary: This study develops a comprehensive model for the evaporation from a micropillar evaporator by coupling the liquid flow with the energy transfer in both liquid and solid domains at both cell-and device-levels. The model successfully validates previous experiments and reveals the previously unexplored role of Marangoni flow in the evaporation of water from micropillar evaporators.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
Liril D. Silvi, Dinesh K. Chandraker, Sumana Ghosh, Arup K. Das
Summary: This study utilizes numerical methods to investigate the dryout mechanism during flow boiling around a heated cylindrical rod under high working pressure, illustrating various mechanisms and their impacts visually.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: Experimental critical heat flux (CHF) data for cryogen flow in round tubes have been consolidated from world literature dating back to 1959, resulting in the largest cryogen CHF database assembled to date. New universal CHF correlations are developed for two distinct CHF mechanisms based on careful physics-based segregation of the data, showing good predictive agreement with the database.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
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
Nuclear Science & Technology
Tadakatsu Yodo, Naoya Odaira, Daisuke Ito, Kei Ito, Yasushi Saito
Summary: This study proposes a mechanistic model-based correlation for the critical heat flux in light water reactors. The correlation is based on an annular film dryout mechanistic model and provides an explicit equation that can be applied to a wide range of coolant conditions. The developed correlation predicts critical heat flux in the pressure range of 1-16 MPa, mass velocity range of 500-3000 kg/m(2)s, and thermal equilibrium quality range of 0.05-0.7. The correlation’s prediction agrees well with the existing mechanistic model without numerical integration.
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Wen-Ken Li, Shu-Hao Hsu, Tsing-Fa Lin, Chien-An Chen, Wei-Mon Yan
Summary: This study aims to experimentally evaluate the heat transfer of time-dependent saturated flow boiling (TDSFB) in order to improve the energy efficiency of heat exchanger systems. The effects of various operating parameters on the heat transfer characteristics of TDSFB are explored and it is found that the mean applied heat flux has a significant influence on the boiling curve and boiling heat transfer coefficient (BHTC). The oscillation of the heat flux results in three different flow patterns, namely single-phase flow (SPF), intermittent boiling flow (IBF), and persistent boiling flow (PBF). A correlation equation is provided to determine the boundaries between these flow patterns.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Jong Seok Oh, Sang Mo An, Hwan Yeol Kim, Dong Eok Kim
Summary: In this paper, the hydrodynamic behaviors of fluid flow through porous particle beds were comprehensively evaluated using experimental and numerical methods. The study focused on single-phase and two-phase flows, as well as different types of particle arrangements. The results showed the importance of considering the interfacial drag force in predicting pressure loss and critical flow phenomena in porous beds.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Albraa A. Alsaati, David M. Warsinger, Justin A. Weibel, Amy M. Marconnet
Summary: Boiling enables high rates of heat transfer, but extreme geometrical confinement of the liquid above the boiling surfaces can reduce heat transfer efficiency. This study proposes a new mechanistic model to predict critical heat flux (CHF) during boiling within a narrow gap, accounting for confinement effects on the triggering mechanism. The model is compared to experimental data and demonstrates improved prediction accuracy, enabling practical implementation of compact two-phase cooling technologies.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Nuclear Science & Technology
Dali Yu, Chi Xu, Chongju Hu, Yijiang Fan
Summary: In this study, a universal mechanistic model was developed based on experimental data to accurately predict the full-range post-dryout heat transfer. The model considers three-path heat transfer and the impact of the flow cross-section, providing precise predictions for the peak wall temperature position in most cases.
NUCLEAR ENGINEERING AND DESIGN
(2022)
Article
Thermodynamics
Aranyak Chakravarty, Koushik Ghosh, Swarnendu Sen, Achintya Mukhopadhyay
Summary: This article discusses the impact of liquid coolant subcooling on multiphase fluid flow and boiling heat transfer in porous media with internal heat generation. The results show that the presence of subcooled liquid coolant requires a higher heating power density for achieving the same temperature rise in the porous body, and it enhances the thermal energy removal limit.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Sen Chen, Lixin Chen, Xiaoyan Tian, Xiaoya Kang, Xiaofei Luo, Da Li, Weitong Li, Huaqi Li
Summary: An experimental study on critical heat flux (CHF) in a vertical annulus channel revealed that CHF initially occurs in a small zone on the heated rod wall, and the dry-out area expands if power is not immediately cut off. The study also found that CHF is predominantly observed at the upper thermocouple position near the outlet, with lower CHFs observed at lower positions during low mass flux conditions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
Article
Nuclear Science & Technology
Joseph Seo, Saya Lee, Se Ro Yang, Yassin A. Hassan
Summary: An experimental investigation was conducted on the convective boiling heat transfer of annular flow in concentric and eccentric annuli. Advanced measurement techniques were applied to acquire the dynamics of the liquid film. The results showed that vapor superficial velocity is the primary factor influencing liquid film dynamics and heat transfer coefficient increased with liquid superficial velocity.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Nuclear Science & Technology
Shengxing Yang, Houjun Gong, Yu Fang, Yuwen Hu, Yuanfeng Zan, Zumao Yang, Pengzhou Li
Summary: During severe accidents, a debris bed is formed after core meltdown and coolant interaction, which is crucial for melt retention in vessel and accident termination. Studying the drying characteristics of such particle beds can enhance the safety margin of the In-Vessel Retention (IVR) strategy.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Giulia Spinato, Navid Borhani, Brian P. d'Entremont, John R. Thome
APPLIED THERMAL ENGINEERING
(2015)
Article
Engineering, Environmental
Bo Jiang, Alejandro J. Santis-Alvarez, Paul Muralt, Dimos Poulikakos, Navid Borhani, John R. Thome, Thomas Maeder
CHEMICAL ENGINEERING JOURNAL
(2015)
Article
Thermodynamics
Giulia Spinato, Navid Borhani, John R. Thome
Article
Nanoscience & Nanotechnology
S. Khodaparast, M. Magnini, N. Borhani, J. R. Thome
MICROFLUIDICS AND NANOFLUIDICS
(2015)
Article
Thermodynamics
Houxue Huang, Navid Borhani, John Richard Thome
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2016)
Article
Thermodynamics
Giulia Spinato, Navid Borhani, John R. Thome
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2016)
Article
Engineering, Electrical & Electronic
Houxue Huang, Navid Borhani, John Richard Thome
JOURNAL OF ELECTRONIC PACKAGING
(2016)
Article
Thermodynamics
C. Falsetti, H. Jafarpoorchekab, M. Magnini, N. Borhani, J. R. Thome
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Houxue Huang, Navid Borhani, Nicolas Lamaison, John R. Thome
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2017)
Article
Optics
Navid Borhani, Eirini Kakkava, Christophe Moser, Demetri Psaltis
Article
Biochemical Research Methods
Navid Borhani, Andrew J. Bower, Stephen A. Boppart, Demetri Psaltis
BIOMEDICAL OPTICS EXPRESS
(2019)
Article
Multidisciplinary Sciences
Pooria Hadikhani, Navid Borhanil, S. Mohammad H. Hashemi, Demetri Psaltis
SCIENTIFIC REPORTS
(2019)
Article
Engineering, Electrical & Electronic
Eirini Kakkava, Babak Rahmani, Navid Borhani, Ugur Tegin, Damien Loterie, Georgia Konstantinou, Christophe Moser, Demetri Psaltis
OPTICAL FIBER TECHNOLOGY
(2019)
Proceedings Paper
Engineering, Biomedical
Eirini Kakkava, Navid Borhani, Christophe Moser, Demetri Psaltis
HIGH-SPEED BIOMEDICAL IMAGING AND SPECTROSCOPY IV
(2019)
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)
