Article
Thermodynamics
Sandipan Banerjee, Yang Liu, Mark Sussman, Yongsheng Lian
Summary: This paper proposes a new approach to simulate the evaporation and depletion process of the liquid micro layer in nucleate boiling. By estimating the micro layer thickness and calculating the temperature gradient integration, the simulation of bubble growth rate and heat flux is achieved and verified against experimental results.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Lubomir Bures, Yohei Sato
Summary: This study describes the formation of a microlayer in nucleate boiling as a dewetting transition in the presence of phase change, and develops a new formulation for the transition criterion based on a synthesis of existing theoretical, experimental and numerical data. The new criterion shows very good agreement with reference data from a dewetting experiment of a volatile liquid and results from a high-resolution direct numerical simulation of nucleate boiling, particularly for Jakob numbers around 75 which cover many important boiling situations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Thermodynamics
Lin Shi, Chengzhi Hu, Changli Yi, Jizu Lyu, Minli Bai, Dawei Tang
Summary: A model of nucleate boiling of liquid on the structured surface was constructed, and the processes of nucleate generation and bubble growth were directly observed using molecular dynamics simulation. The research found that the position and number of interfaces are mainly determined by the potential energy restriction generated by structures, which significantly affects the critical heat flux. In addition, liquid retention also affects interfaces and critical heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Mojtaba Edalatpour, Camryn L. Colon, Jonathan B. Boreyko
Summary: By using ice pellets instead of water droplets, nucleate boiling can be maintained up to 500 ℃, as the tandem phase-change processes at the solid-liquid and liquid-vapor interfaces dampen the rate of vapor generation.
Article
Chemistry, Multidisciplinary
Eduardo Freitas, Pedro Pontes, Ricardo Cautela, Vaibhav Bahadur, Joao Miranda, Ana P. C. Ribeiro, Reinaldo R. Souza, Jeferson D. Oliveira, Jacqueline B. Copetti, Rui Lima, Jose E. Pereira, Antonio L. N. Moreira, Ana S. Moita
Summary: The study demonstrates the benefits of using biphilic patterns to enhance pool-boiling heat transfer, control bubble generation, and promote heat dissipation through fluid convection, resulting in surface cooling. Additionally, the use of synchronized high-speed and thermographic images, along with a numerical model, provides insights into the dynamics of bubble formation and heat transfer processes in nanofluid-enhanced surfaces.
Article
Computer Science, Interdisciplinary Applications
Loric Torres, Annafederica Urbano, Catherine Colin, Sebastien Tanguy
Summary: Numerical simulations of Nucleate Boiling have gained increasing attention in recent years. Further studies are required on the modeling of heat flux near the contact line. This paper proposes a coupling methodology between a micro-region theoretical model and a larger scale DNS solver to investigate the quantitative effect of the micro-region on bubble growth in Nucleate Boiling.
JOURNAL OF COMPUTATIONAL PHYSICS
(2024)
Article
Thermodynamics
Byong Guk Jeon, Moon Hee Choi, Dong Hoon Kam, Young Jung Youn, Sang-Ki Moon
Summary: This study examines the phenomenon of rewetting failure of a dry patch during departure from nucleate boiling (DNB) and aims to provide a deeper understanding of the mechanism of DNB occurrence. Experimental results show that the development pattern of the dry patch is influenced by the flow rate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Prasad Kangude, Atul Srivastava
Summary: This study investigates the effects of absolute surface wettability on nucleate pool boiling heat transfer under saturated conditions using water as the working fluid. The results show that enhancing surface wettability improves the overall boiling performance, which can be explained by the modified bubble dynamics and the associated bubble base evaporation mechanism.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Thermodynamics
Jeongmin Lee, Issam Mudawar, Mohammad M. Hasan, Henry K. Nahra, Jeffrey R. Mackey
Summary: This study investigates the near-saturated flow boiling of FC-72 in microgravity using Computational Fluid Dynamics (CFD) and validates the results against experimental data. The study reveals different flow mechanisms such as bubble nucleation, growth, and vapor blankets, while also noting the uniformity of wall temperature along the heated length.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Fernando G. de Souza, Luis H. R. Cisterna, Fernando H. Milanez, Marcia B. H. Mantelli
Summary: This paper presents an experimental study on the Geyser Boiling phenomenon in two-phase thermosyphons operating with two working fluids simultaneously. The influence of various parameters on the amplitude and frequency of the Geyser Boiling phenomenon is investigated, and it is concluded that the phenomenon can be characterized by Reynolds, Jakob and Bond numbers. Two extreme low and high performance conditions are observed in the Geyser Boiling regime operation.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Jiaqi Li, Gaohua Zhu, Daniel Kang, Wuchen Fu, Yongyi Zhao, Nenad Miljkovic
Summary: This study develops a technique for fabricating ultra-small microchannels on arbitrary metallic materials, and investigates the pool boiling heat transfer performance of copper microchannels, with a focus on three-phase contact line dynamics. The results demonstrate that the scalable microchannel surfaces exhibit superior heat transfer performance, with a maximum heat transfer coefficient enhancement of 930% and ultra-low wall superheat of 5 degrees C.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Thermodynamics
Xueli Wang, Yan Du, Ye Tang, Lang Liu, Bin Liu, Bo Zhang, Mei Wang, Yujiao Zhao, Chao Huan
Summary: This study investigates the boiling heat transfer mechanisms on two sized chips and finds that the boiling regime and critical point are influenced by gravitational acceleration under the controlled wall heat flux condition. The gravity effect is greater under controlled wall heat flux condition compared to controlled wall temperature condition. Additionally, a set of gravity scaling parameters is proposed to accurately predict microgravity boiling heat transfer performance.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Thermodynamics
Luis H. R. Cisterna, Fernando H. Milanez, Marcia B. H. Mantelli
Summary: This work presents an analytical model to predict the Geyser Boiling limit for high temperature two-phase thermosyphons, introducing a new dimensionless bubble release number as an indicator for ideal operation. Experimental observations show that thermosyphons operate in ideal regime when the bubble release number is below 0.01, surpassing the Geyser Boiling phenomenon.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Nuclear Science & Technology
Ji-Hwan Park, Il Seouk Park, Daeseong Jo
Summary: Pool boiling experiments were conducted under isolated bubble regime at 0 degrees and 45 degrees inclination angles. Pressure, buoyancy, and surface tension forces played important roles as a bubble grew and departed from the heating surface. Curvature, base diameter, and bubble volume were used to calculate these forces, while contact angle, base diameter, and volume were evaluated using high-speed camera images. The contact angle equation proposed by Fritz was modified with the contact angles obtained in this study. The growth and departure of bubbles were discussed in relation to the forces of pressure, buoyancy, and surface tension.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Thermodynamics
Alexander Ashikhmin, Alexandra Semyonova, Vladislav Fedorov, Sergey Misyura, Maxim Piskunov
Summary: The collision of fuel droplets with the walls of the combustion chamber plays a significant role in the formation of the air-fuel mixture. This study focuses on the hydrodynamic parameters of the drop-wall interaction in the nucleate boiling process of an n-decane-based water-in-oil emulsion, and their influence on heat transfer. Experimental measurements are used to derive empirical models for the contact time of droplets and the heat flux density at the solid-liquid interface during nucleate boiling. These models provide insights into the heat transfer characteristics during the formation of an air-fuel mixture in the combustion chamber of an engine.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Matthias Zimmermann, Michael Heinz, Axel Sielaff, Tatiana Gambaryan-Roisman, Peter Stephan
EXPERIMENTAL HEAT TRANSFER
(2020)
Article
Chemistry, Physical
Adnan Khalil, Matthias Zimmermann, Alena K. Bell, Ulrike Kunz, Steffen Hardt, Hans-Joachim Kleebe, Robert W. Stark, Peter Stephan, Annette Andrieu-Brunsen
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Energy & Fuels
Johannes Oltmanns, David Sauerwein, Frank Dammel, Peter Stephan, Christoph Kuhn
ENERGY SCIENCE & ENGINEERING
(2020)
Article
Engineering, Mechanical
Fabian Kraemer, Marcus Klein, Matthias Oechsner
ENGINEERING FAILURE ANALYSIS
(2020)
Article
Engineering, Mechanical
M. B. Geilen, M. Klein, M. Oechsner, M. Kaffenberger, K. Stoerzel, T. Melz
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Materials Science, Coatings & Films
U. Reisgen, M. Oechsner, R. Sharma, J. Ellermeier, G. Andersohn, T. Engler, E. Zokoll, B. Heider, E. Gonzalez Olivares
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2020)
Article
Metallurgy & Metallurgical Engineering
B. Schork, Uwe Zerbst, Y. Kiyak, M. Kaffenberger, M. Madia, M. Oechsner
WELDING IN THE WORLD
(2020)
Article
Chemistry, Physical
Max Benedikt Geilen, Marcus Klein, Matthias Oechsner
Article
Thermodynamics
J. Wassenberg, P. Stephan, T. Gambaryan-Roisman
Summary: The study found that liquid jet impingement can effectively enhance cooling efficiency, especially at a pulsation frequency of 100 Hz. The influence of jet pulsation on impinging horizontal jets onto vertical walls has not been investigated yet.
HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Satyanand Abraham, Anand Takawale, Peter Stephan, Arvind Pattamatta
Summary: The study showed that the heat transfer performance of a three-dimensional pulsating heat pipe (PHP) is effective, with significantly higher effective thermal conductivity for horizontal and vertical orientations. Additionally, the use of binary fluids can increase the maximum heat input of the heat pipe in different heating modes.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2021)
Article
Energy & Fuels
Axel Dietrich, Frank Dammel, Peter Stephan
Summary: Pumped heat electricity storage (PHES) systems store electrical energy in the form of thermal energy, offering an alternative to established storage technologies. Numerical models were developed to simulate the transient operation of PHES systems, showing a round-trip efficiency of 42.9% but higher power-specific costs compared to traditional storage technologies. Despite being not economically viable for the day-ahead market in Germany and Austria, PHES systems have the advantage of being location-independent.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Thermodynamics
Ganesh Guggilla, Ramesh Narayanaswamy, Peter Stephan, Arvind Pattamatta
Summary: The study focuses on simulating consecutive impinging droplets on a hot surface, investigating the heat transfer dynamics and revealing the effects of droplet flow rate and surface thickness on heat transfer patterns.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Frederik Feike, Johannes Oltmanns, Frank Dammel, Peter Stephan
Summary: Internet usage, data transfer, and computing power are growing rapidly, leading to an increase in the number of data centers with high power densities. Waste heat from data centers can be utilized for urban heat supply. High source temperatures ensure efficient operation of heat pumps for waste heat utilization.
Article
Thermodynamics
M. Maliha, J. Ickinger, H. Kubach, O. Schumacher, T. Koch, P. Stephan
Summary: This study investigates the influence of potential e-Fuel dimethylcarbonate (DMC) on combustion behavior, particularly the formation of combustion chamber deposits (CCD). Experimental results showed the impact of DMC on CCD formation and characterized the dependence of emissions on DMC content. Detailed observations of the combustion process were conducted using optical access.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2022)
Article
Thermodynamics
Henrik Sontheimer, Alireza Gholijani, Peter Stephan, Tatiana Gambaryan-Roisman
Summary: This study investigates the hydrodynamics and heat transport during the vertical coalescence of multiple drops impacting successively onto a hot wall using numerical simulations and experiments. The numerical model considers evaporation and uses the volume of fluid method within the OpenFOAM library. Experimental data is compared with numerical results for low impact frequency case, and the appearance of high heat flux rings during the impingement of the second drop is analyzed. The impact of a drop chain consisting of five drops at a high frequency is also studied numerically.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)