Article
Thermodynamics
Liansheng Liu, Xuanchen Liu, Wenqi Jia, Wenjia Ren, Liang Tian, Runze Duan
Summary: This study investigates the evaporation characteristics of droplets attached to a high temperature wall, revealing the intense evaporation process in the boiling regime and the transition from static evaporation to nucleate boiling. The study verifies the feasibility of numerical simulation for studying droplet evaporation in the boiling regime, which is consistent with experimental results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Physics, Applied
Madhumitha Ravichandran, Guanyu Su, Chi Wang, Jee Hyun Seong, Artyom Kossolapov, Bren Phillips, Md Mahamudur Rahman, Matteo Bucci
Summary: A neural network model was developed to predict the departure from nucleate boiling ratio (DNBR) using high-resolution infrared measurements of bubble dynamics on different surfaces. The importance of fundamental boiling parameters such as nucleation site density, bubble departure frequency, growth time, and footprint radius in predicting the boiling crisis was elucidated. The study concluded that these parameters are equally necessary and important, undermining the general validity of models attempting to predict critical heat flux based on single boiling parameters.
APPLIED PHYSICS LETTERS
(2021)
Article
Thermodynamics
Subhanker Paul, Maria Fernandino, Carlos A. Dorao
Summary: During convective boiling heat transfer, the dominant role of vapor Reynolds number has been overlooked, while the enhancement factor to the liquid Reynolds number does not appropriately correlate the heat transfer coefficient. Most proposed enhancement factors can be rewritten in terms of the explicit contribution of the Re-v.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Houpei Li, Pega Hrnjak
Summary: This paper presents the measurements of flow boiling heat transfer coefficient and pressure gradient for R32 and R1234yf mixtures in a microchannel tube. The results show that mass flux has a significant effect on both heat transfer coefficient and pressure gradient, while heat flux only affects the heat transfer coefficient. Furthermore, the temperature glide curve has an impact on the heat transfer coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Rajendran Prabakaran, Mohammad Salman, Poongavanam Ganesh Kumar, Dongchan Lee, Sung Chul Kim
Summary: This study investigated the evaporation characteristics of the R290 + CF3i mixture in a plate heat exchanger and found that nucleate boiling is quenched at lower vapor quality. The two-phase frictional pressure drop increases with mean vapor quality. The heat transfer coefficient is largely augmented with increases in mass flux.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Yiwu Kuang, Fei Han, Lijie Sun, Rui Zhuan, Wen Wang
Summary: A numerical model for hydrogen nucleate flow boiling is established, studying the heat transfer performance, wall heat flux, and void fraction distribution of hydrogen flow boiling. A new correlation is proposed for predicting the Nusselt number of hydrogen saturated nucleate flow boiling.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Xiaojing Ma, Jinliang Xu, Liang Gong, Haoran Hong, Chunlei Cao, Chaoqiang Wang
Summary: We investigated droplet evaporation on heater surfaces with different thermal conductivities using the phase change lattice Boltzmann model. The evaporation curves revealed four regimes: film evaporation, nucleate boiling, transition, and Leidenfrost. We found that higher thermal conductivity does not always accelerate droplet evaporation. In transition regime, lower thermal conductivity enhances droplet evaporation by triggering the second contact between droplet and heater.
APPLIED THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Limiao Zhang, Chi Wang, Guanyu Su, Artyom Kossolapov, Gustavo Matana Aguiar, Jee Hyun Seong, Florian Chavagnat, Bren Phillips, Md Mahamudur Rahman, Matteo Bucci
Summary: This study reveals and justifies the existence of a unifying criterion for the boiling crisis. The criterion arises from an instability in the near-wall interactions of bubbles, characterized by three fundamental boiling parameters: nucleation site density, average bubble footprint radius, and the product of average bubble growth time and detachment frequency. Experimental results confirm the presence of this criterion for various boiling surface geometries and textures, two boiling regimes, and two fluids. This criterion provides a simple mechanistic rule for predicting the boiling crisis and guiding the design of boiling surfaces for enhanced nucleate boiling performance.
NATURE COMMUNICATIONS
(2023)
Article
Thermodynamics
Yukai Lin, Fuqiang Chu, Xiaomin Wu
Summary: This study investigates the evaporation and boiling process of water-alcohol droplets and explores the effects of concentration and substrate temperature on droplet wetting and heat transfer. A predictive model is established and proven accurate in predicting evaporation rates of water-alcohol droplets, revealing the importance of selective evaporation and convective heat transfer in different boiling regimes.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
A. A. Genbach, H. I. Beloev, D. Yu Bondartsev, N. A. Genbach
Summary: This study develops a hydrodynamic model of the boiling crisis in porous structures using holographic interferometry and velocimetry. Two mathematical models are proposed based on internal boiling characteristics revealed by velocity filming. The models agree well with experimental results for a wide range of pressure changes and different heat sources and porous structures.
Article
Thermodynamics
D. C. Moreira, V. S. Nascimento, G. Ribatski, S. G. Kandlikar
Summary: By employing an asymmetric Dual-V groove microchannels geometry and a tapered open manifold, significant enhancements in critical heat flux (CHF), heat transfer coefficient (HTC), and reduction in pressure drop (delta p) were achieved in flow boiling. The design utilizes evaporation momentum force and inertia force to optimize the bubble motion, leading to improved performance in flow boiling.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Lenan Zhang, Shuai Gong, Zhengmao Lu, Ping Cheng, Evelyn N. Wang
Summary: This study introduces a mechanistic and predictive theory for the boiling crisis, successfully predicting the critical heat flux (CHF) and the corresponding wall superheat by combining the thermo-fluidic and stochastic interaction. This theory offers a new avenue for understanding the boiling crisis and can serve as a guideline for future boiling enhancement design.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Ben Chu, Cheng Fang, Feiyu Zheng, Weizheng Cheng, Ruitong Wang, Wanli Zhang, Jinran Tao, Lei Huai, Peng Tao, Chengyi Song, Wen Shang, Benwei Fu, Tao Deng
Summary: Graphene-based films can enhance heat transfer capacity by modifying surface structure and chemistry, but current preparation methods are complex and require additional equipment. The SBISA method developed in this study offers a simple way to generate graphene-based films, leading to significant improvements in boiling performance.
MATERIALS TODAY ENERGY
(2021)
Article
Thermodynamics
Mohammad Salman, Rajendran Prabakaran, Dongchan Lee, Sung Chul Kim
Summary: This study experimentally investigated the saturated flow boiling characteristics of R290/R1270 mixture and pure R290 in a plate heat exchanger with offset strip fins. The results showed that convection dominated the boiling process at higher vapor qualities, while nucleate boiling dominated at lower vapor qualities. The heat-transfer coefficient and frictional pressure drop of R290/R1270 were strongly influenced by the mass flux range. Correlations for R290/R1270 in the form of Nusselt number and the two-phase friction factor have been established with high reliability.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Mostafa Mobli, Mahmoud Bayat, Chen Li
Summary: In this study, a comprehensive model capable of simulating phase change phenomena and interfacial heat transfer coefficient (IHTC) in pool boiling is developed. The challenges in simulating bubble dynamics and phase change heat transfer using a VOF method are successfully addressed to achieve more accurate simulations.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
S. Y. Misyura
Summary: Experimental study shows that the corrosion of aluminum alloy significantly affects the kinetics of droplet evaporation, controlling the wettability and evaporation rate of the droplet. The decrease in evaporation rate can be attributed to the reduction in heat supply caused by corrosion.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
S. Y. Misyura
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2020)
Article
Engineering, Chemical
S. Y. Misyura, R. Egorov, V. S. Morozov, A. S. Zaitsev
Summary: Local laser heating of the liquid film leads to simultaneous self-organization of cellular convective structures and micron-scale particles, forming hexagonal clusters. The liquid film, which is ten times the diameter of the convective cells, does not form toroidal structures, with convective cells only forming near the heating center.
Article
Thermodynamics
Nikita Khomutov, Sergey Misyura, Maxim Piskunov, Alexandra Semyonova, Pavel Strizhak, Roman Volkov
Summary: The experimental findings present the convective heat transfer in drops and films of fuel microemulsions heated on hot surfaces, analyzing features and characteristics of vaporization and coalescence of the dispersed phase of microemulsions using optical microscopy. The results show that the evaporation rate of the dispersed phase largely depends on the emulsifier and distilled water concentration, with droplet size decreasing linearly with temperature below 80 degrees C and increasing above 80 degrees C. The number of large coalesced droplets decreases linearly with time, more intensively at surface temperatures above 80 degrees C.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Thermodynamics
S. Y. Misyura
Summary: Experimental studies on evaporation, crystallization, and heat transfer in a droplet of NaCl/H2O solution have shown that supersaturation and heating of the wall significantly affect the process. Four characteristic modes of evaporation and crystallization are distinguished, with the ratio of the crystallization rate to the evaporation rate being highly variable and regulated by Marangoni convection. The data obtained provide insights for the development of high-temperature crystallization concepts in the presence of intense Marangoni flow.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
S. Y. Misyura, R. Egorov, V. S. Morozov, A. S. Zaitsev
Summary: The experimental study reveals that the interaction of thermocapillary and thermogravitational-free convection in a thin layer of liquid can result in self-organization or partial disintegration of micro-vortices, with convection scales changing continuously over time due to complex nonlinear interactions between vortex structures and scales.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2021)
Article
Chemistry, Physical
R. Egorov, S. Y. Misyura, V. S. Morozov, A. S. Zaitsev
Summary: This experimental study investigates the aggregation of TiO2 microparticles and the self-organization of clusters in a thin layer of water. The complex behavior of the cluster, with periodic changes in particle sizes and cell numbers, is observed under local heating. Furthermore, it is shown that stability of convective cells is lost and the cluster disintegrates partially when particle and coagulated particle diameters reach their maximum.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
S. Y. Misyura, D. V. Feoktistov, V. S. Morozov, E. G. Orlova, G. V. Kuznetsov, A. G. Islamova
Summary: The kinetics of electrochemical corrosion of aluminum alloy surfaces with different wettability was analyzed. Laser-textured samples exhibited enhanced corrosion protective properties compared to polished samples.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Thermodynamics
O. S. Gaydukova, S. Y. Misyura, P. A. Strizhak
Summary: This numerical study investigates interrelated heat transfer processes during conductive heating of methane gas hydrate ignition with chemical reactions and exothermic and endothermic phase transformations. The study establishes the dependencies of the main characteristic - ignition delay time on heating surface temperature, sample heating rate, activation energy, and pre-exponential multiplier of fuel vapor oxidation reaction. The research reveals the limiting values of the main parameters of the energy source for steady implementation of ignition conditions.
COMBUSTION AND FLAME
(2021)
Proceedings Paper
Thermodynamics
Sergey Misyura
Summary: Forced convection increases the dissociation rate of gas hydrate, with two typical decay modes during the dissociation process of complex gas hydrate. The optimal air velocity for increasing combustion efficiency falls within the range of 0.75-1.25 m/s. However, exceeding a velocity of 3.5 m/s leads to the cessation of fuel combustion.
THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2020)
(2021)
Proceedings Paper
Thermodynamics
Sergey Misyura
Summary: Experimental studies showed that combustion of gas hydrates significantly increases dissociation rate, leading to uneven temperature distribution. When modeling fluid mixtures, both free and forced convection must be taken into account.
THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2020)
(2021)
Review
Thermodynamics
I. I. Gogonin, S. Ya. Misyura
JOURNAL OF ENGINEERING THERMOPHYSICS
(2020)
Article
Chemistry, Physical
S. Y. Misyura, R. Egorov, V. S. Morozov, A. S. Zaitsev
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Proceedings Paper
Thermodynamics
Sergey Misyura
THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2019)
(2020)
Article
Thermodynamics
S. Ya. Misyura, V. S. Morozov, O. A. Gobyzov
JOURNAL OF ENGINEERING THERMOPHYSICS
(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)