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Journal articles on the topic 'Departure Diameter'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Matkovič, Marko, and Boštjan Končar. "Bubble Departure Diameter Prediction Uncertainty." Science and Technology of Nuclear Installations 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/863190.

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This paper presents quality assessment of a mechanistic modelling for bubble departure diameter prediction during pool boiling condition. In contrast to flow boiling process only buoyancy force with opposing surface tension force was considered as the responsible mechanisms for bubble departure. Indeed, inertia from the fluid flow around the bubble and the growth force, which describes momentum change due to the evaporation at the bubble base and condensation at the top of the bubble, were all neglected. Besides, shear lift force and quasi-steady drag force as the dominant inertia driven forces were also neglected in the assessment. Rather than trying to model bubble dynamics as precise as possible by properly addressing all the relevant mechanisms available, the work focuses on prediction accuracy of such approach. It has been shown that inlet boundary conditions with realistic experimental accuracy may lead to a significant uncertainty in the prediction of bubble departure diameter, which is intrinsically connected to the uncertainty of most heat partitioning and CHF models.

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2

Joko Suroto, Bambang. "Pengaruh Nilai Wettability terhadap Bubble Departure Diameter dan Bubble Departure Frequency." Jurnal Ilmu dan Inovasi Fisika 1, no. 2 (July 3, 2017): 47–51. http://dx.doi.org/10.24198/jiif.v1i02.15358.

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3

Levin, Anatoliy, and Polina Khan. "Bubble departure diameter at transient heat release." MATEC Web of Conferences 115 (2017): 08014. http://dx.doi.org/10.1051/matecconf/201711508014.

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4

Dzienis, Paweł, Romuald Mosdorf, Tomasz Wyszkowski, and Gabriela Rafałko. "Non-Linear Analysis of Air Pressure Fluctuations During Bubble Departure Synchronisation." Acta Mechanica et Automatica 13, no. 3 (September 1, 2019): 158–65. http://dx.doi.org/10.2478/ama-2019-0021.

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Abstract In the recent paper, non-linear methods of data analysis were used to study bubble departure synchronisation. In the experiment, bubbles were generated in engine oils from two neighbouring brass nozzles (with an inner diameter of 1 mm). During the experiment, the time series of air pressure oscillations in the air supply system and voltage changes on phototransistor were recorded. The analysis of bubble departure synchronisation was performed using a correlation coefficient. The following methods of non-linear data analysis are considered. Fast Fourier Transformation, autocorrelation, attractor reconstruction, correlation dimension, largest Lyapunov exponent and recurrence plot analysis were used to examine the correlation between bubbles behaviour and character of pressure fluctuations. Non-linear analysis of bubble departure synchronisation revealed that the way of bubble departures from two neighbouring nozzles does not depend simply on the character of pressure fluctuations in the nozzle air supply systems. The chaotic changes of the air pressure oscillations do not always determine the chaotic bubble departures.

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5

Wang, Jinfeng, Bingjun Wang, Jing Xie, Ke Lei, Bo Yu, and Yuhang Sun. "Numerical Simulation Research of Bubble Characteristics and Bubble Departure Diameter in Subcooled Flow Boiling." Mathematics 10, no. 21 (November 3, 2022): 4103. http://dx.doi.org/10.3390/math10214103.

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Three-dimensional subcooled flow boiling of R134a in a horizontal tube was simulated by a VOF (volume of fluid) model combined with the level set method. Bubble characteristics were explored at heat flux of 0.3 MW/m2, inlet subcooling of 3 K, and inlet velocity of 0.4 m/s. It was observed that five representative bubbles occurred in subcooled flow boiling, including sliding bubble, coalescing bubble, non-departed bubble, bouncing bubble, and continuous-boiling bubble. The results showed that the bubble radial velocity was an important factor of bubble departure after a sliding process. Moreover, the effect of heat flux, inlet velocity, and inlet subcooling on bubble departure diameter were investigated. The departure diameter increased with increasing inlet velocity from 0.2 to 0.4 m/s and heat flux from 0.2 to 0.4 MW/m2, while diameter decreased with inlet subcooling from 3 to 10 K. Finally, based on the influence of heat flux, inlet velocity, and inlet subcooling on average departure diameter of the bubble except the coalescing bubble, a model was proposed to predict the average departure diameter. The deviation of the model was within 5%.

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6

Kaniowski, Robert, Robert Pastuszko, Joanna Kowalczyk, and Łukasz Nowakowski. "Bubble departure diameter determination for pool boiling on surface with microchannels." E3S Web of Conferences 70 (2018): 02008. http://dx.doi.org/10.1051/e3sconf/20187002008.

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The paper presents visualization investigations into pool boiling heat transfer for open microchannel surfaces. The experiments were carried out with saturated water, ethanol, FC-72 and Novec-649 at atmospheric pressure. Parallel microchannels fabricated by machining copper sample were about 0.2 to 0.5 mm wide and 0.2 to 0.5 mm deep. The diameter of departing bubble was calculated for the microchannel surface on the basis of buoyancy force and surface tension force balance. The visualization carried out was aimed at determining the diameters of the departing bubbles at various heat fluxes for four working fluids.

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7

Yamamoto, Ken, and Satoshi Ogata. "Control of the bubble departure diameter by saw-tooth surfaces." Colloids and Surfaces A: Physicochemical and Engineering Aspects 460 (October 2014): 377–85. http://dx.doi.org/10.1016/j.colsurfa.2014.03.025.

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8

Sattari, Mohammad, and Leila Mahdavian. "Thermodynamic properties of the bubble growth process in a pool boiling of water-ethanol mixture two-component system." Open Chemistry 17, no. 1 (February 22, 2019): 88–95. http://dx.doi.org/10.1515/chem-2019-0010.

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AbstractSaturated pool boiling in a two-component water-ethanol solution was studied at a pressure of one atmosphere in a horizontal stainless steel cylinder. Solutions with volumes of 3%, 7%, and 12% of water-ethanol solution were examined at a heat flux of 1.8 to 60 kW/m2. Videos and photos were analyzed and changes in bubble diameter, growth, and departure parameters were recorded. The results showed that the bubble departure diameters increased with increasing heat flux, but diameters decrease with increasing ethanol mass fraction. The experimental data are evaluated with two models of Alavi Fazel and Hamzehkhani’s model, have better fitting with Hamzehkhani’s model.

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9

Zhou, Pei, Ronghua Huang, Sheng Huang, Yu Zhang, and Xiaoxuan Rao. "Experimental investigation on bubble contact diameter and bubble departure diameter in horizontal subcooled flow boiling." International Journal of Heat and Mass Transfer 149 (March 2020): 119105. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.119105.

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10

Mosdorf, Romuald, Tomasz Wyszkowski, and Kamil Dąbrowski. "Multifractal properties of large bubble paths in a single bubble column." Archives of Thermodynamics 32, no. 1 (April 1, 2011): 3–20. http://dx.doi.org/10.2478/v10173-011-0001-9.

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Multifractal properties of large bubble paths in a single bubble columnIn the paper the paths of bubbles emitted from the brass nozzle with inner diameter equal to 1.6 mm have been analyzed. The mean frequency of bubble departure was in the range from 2 to 65.1 Hz. Bubble paths have been recorded using a high speed camera. The image analysis technique has been used to obtain the bubble paths for different mean frequencies of bubble departures. The multifractal analysis (WTMM - wavelet transform modulus maxima methodology) has been used to investigate the properties of bubble paths. It has been shown that bubble paths are the multifractals and the influence of previously departing bubbles on bubble trajectory is significant for bubble departure frequencyfb> 30 Hz.

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11

Kolev, Nikolay Ivanov. "The influence of mutual bubble interaction on the bubble departure diameter." Experimental Thermal and Fluid Science 8, no. 2 (February 1994): 167–74. http://dx.doi.org/10.1016/0894-1777(94)90044-2.

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12

Hsu, Li Chieh, Wen Chou Huang, Guo Jhih Gao, Kai Yu Chuang, and Ing Youn Chen. "The Heater Size and Viscosity Effects on Thermal Bubble Growth and Dynamics after Departure." Applied Mechanics and Materials 389 (August 2013): 120–25. http://dx.doi.org/10.4028/www.scientific.net/amm.389.120.

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A single bubble growth after boiling in square vertical tube is studied numerically to better understand bubble formation factors and as well as its moving behavior after departure. The effects of heating surface area and viscosity of fluid are investigate with nucleation time, bubble departure time, bubble dimension as well as boiling curve. The study indicate that the larger heating surface area, the smaller bubble departure diameter and higher nucleation frequency. The larger of viscosity of fluid, the smaller moving deviation from central axis after bubble departure and smaller deformation of the bubble.

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13

Guzella, Matheus dos Santos, Luiz Eduardo Czelusniak, Vinícius Pessoa Mapelli, Pablo Fariñas Alvariño, Gherhardt Ribatski, and Luben Cabezas-Gómez. "Simulation of Boiling Heat Transfer at Different Reduced Temperatures with an Improved Pseudopotential Lattice Boltzmann Method." Symmetry 12, no. 8 (August 14, 2020): 1358. http://dx.doi.org/10.3390/sym12081358.

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The pseudopotential Lattice Boltzmann Method has attracted much attention in the recent years for the simulation of boiling heat transfer. Many studies have been published recently for the simulation of the bubble cycle (nucleation, growth and departure from a heated surface). This paper puts forward two-dimensional simulations of bubble nucleation, growth and departure using an improved pseudopotential Lattice Boltzmann Model from the literature at different reduced temperatures, Tr=0.76 and Tr=0.86. Two different models using the Bhatnagar–Gross–Krook (BGK) and the Multiple-Relaxation-Time (MRT) collision operators with appropriate forcing schemes are used. The results for pool boiling show that the bubbles exhibit axial symmetry during growth and departure. Numerical results of departure diameter and release period for pool boiling are compared against empirical correlations from the literature by varying the gravitational acceleration. Reasonable agreement is observed. Nucleate boiling trends with heat flux are also captured by the simulations. Numerical results of flow boiling simulations are compared by varying the Reynolds number for both reduced temperatures with the MRT model. It was found that the departure diamenter and release period decreases with the increase of the Reynolds number. These results are a direct effect of the drag force. Proper conclusions are commented at the end of the paper.

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14

Abdollahzadeh Jamalabadi, Mohammad, Milad Ghasemi, Rezvan Alamian, Somchai Wongwises, Masoud Afrand, and Mostafa Shadloo. "Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field." Symmetry 11, no. 10 (October 11, 2019): 1275. http://dx.doi.org/10.3390/sym11101275.

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Subcooled flow boiling is one of the major issues in the nuclear and power generation industries. If the fluid inlet temperature in the boiling area is less than the boiling temperature, the boiling process is called subcooled boiling. The symmetry of a physical system is a constant property of the system and is fixed by deformation. Using magnetohydrodynamic (MHD) forces and broken symmetry induced by nanosized particles, fluid and thermal systems can be more controlled. In this study, the effect of a magnetic field and nanoparticles on subcooled flow boiling in a vertical tube was investigated. For this purpose, a one-dimensional numerical code was used to simulate the flow and variations of various parameters that have been investigated and evaluated. The results showed that as the flow entered the heated area, the vapor volume fraction, Froude number, fluid cross-sectional area forces, mixture velocity, fluid velocity, bubble departure diameter, liquid and vapor Reynolds numbers, squared ratio of the Froude number to the Weber number, and fluid cross-sectional area forces coefficient increased. In the same region, the Eötvös number, root mean square (RMS) of the fluid cross-sectional area force, sound velocity, liquid superficial velocity, critical tube diameter, bubble departure frequency, and density of the active nucleation site were reduced. It was also observed that after the heated area and under the influence of the magnetic field and the nanoparticles, the values of the vapor volume fraction, Froude number, fluid cross-sectional area force, mixture velocity, fluid velocity, vapor, liquid Reynolds number, and squared ratio of the Froude number to the Weber number were decreased. Moreover, there was no significant effect on the Eötvös number, liquid superficial velocity, Taylor bubble Sauter mean diameter, bubble departure diameter, critical tube diameter, bubble departure frequency, or density of the active nucleation site.

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15

Guan, P., L. Jia, L. Yin, and Z. Tan. "Effect of Bubble Contact Diameter on Bubble Departure Size in Flow Boiling." Experimental Heat Transfer 29, no. 1 (June 25, 2014): 37–52. http://dx.doi.org/10.1080/08916152.2014.926433.

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16

Vogt, H. "The problem of the departure diameter of bubbles at gas-evolving electrodes." Electrochimica Acta 34, no. 10 (October 1989): 1429–32. http://dx.doi.org/10.1016/0013-4686(89)87183-x.

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17

Du, Jingyu, Chenru Zhao, and Hanliang Bo. "Investigation of bubble departure diameter in horizontal and vertical subcooled flow boiling." International Journal of Heat and Mass Transfer 127 (December 2018): 796–805. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.07.019.

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18

Chang, Wei, Shu Sheng Zhang, Can Zhao, and Yun Li Zhang. "Flow Patterns Transition Criteria from Bubbly to Slug Flow during Flow Boiling in Confined Vertical Narrow Rectangular Channels." Applied Mechanics and Materials 155-156 (February 2012): 616–20. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.616.

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To investigate new features of flow patterns transition during flow boiling in confined vertical narrow rectangular channels, both experiments and theoretical analysis were carried out in the present study. When the channel size was smaller than the bubble departure diameter, a new flow pattern was observed and defined as “confined bubbly flow”. According to the relative size between bubble departure diameter and channel size, two groups of flow pattern transition criteria were developed by using modified drift flux model, with taking features of flow boiling and narrow confinement into account. Satisfactory agreement was obtained by compare model prediction with experiment results. However, further verification and modification are still needed for wider applications.

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19

Peyghambarzadeh, S. M., A. Hatami, A. Ebrahimi, and Alavi Fazel. "Photographic study of bubble departure diameter in saturated pool boiling to electrolyte solutions." Chemical Industry and Chemical Engineering Quarterly 20, no. 1 (2014): 143–53. http://dx.doi.org/10.2298/ciceq120707120p.

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Bubble departure diameters during saturated pool boiling to pure water and three different electrolyte solutions including NaCl, KNO3, and KCl aqueous solutions are experimentally measured. Variable heat fluxes up to 90 kW/m2 and different salt concentrations from 10.6 to 69.6 kg/m3 are applied in order to investigate their effects on the bubble size during pool boiling around the horizontal rod heater. Visual observations demonstrated that larger vapor bubbles generate on the heat transfer surface at higher salt concentrations and lower heat fluxes in all of the solutions tested while in distilled water bubbles become slightly larger with increasing heat flux. Furthermore, the effects of different important physical properties like surface tension, viscosity, and density of the solutions on the bubble departure diameter are also discussed. NaCl solutions have surface tension higher than the other electrolyte solutions. Furthermore, the addition of NaCl to distilled water slightly increases the viscosity of the solution whereas other salts have no measurable effect on the viscosity. Therefore, it is expected that larger bubbles to be appeared on the heat transfer surface during the boiling of NaCl solutions which is in agreement with the experimental results.

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20

Li, Miao Miao, Jun Geng, and Ru Peng Zhu. "Theoretical Analysis of CO₂ Bubble Formation in Anode Flow Field of μDMFC." Applied Mechanics and Materials 635-637 (September 2014): 346–53. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.346.

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A mathematical model was established and validated to predict the microbubble diameter when it departing from the carbon paper and moving into the channel of μDMFC. Single bubble behaviors were studied using the model, which took the gas velocity, liquid cross-flow velocity, micro porous diameter and other parameters into account. Results indicate that the microbubble departure diameter decreases with the increasing liquid velocity, and increases with the increasing micro porous diameter and increasing gas velocity.

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21

Ren, Tingting, Zhiqiang Zhu, Rui Zhang, Jiangwu Shi, and Changqi Yan. "Development of force balance model for prediction of bubble departure diameter and lift-off diameter in subcooled flow boiling." International Journal of Heat and Mass Transfer 161 (November 2020): 120245. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120245.

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22

He, Yichuan, Zhehao Sun, Chengzhi Hu, Zhuo Wang, Hongyang Li, Zongyou Yin, and Dawei Tang. "Data-driven engineering descriptor and refined scale relations for predicting bubble departure diameter." International Journal of Heat and Mass Transfer 195 (October 2022): 123078. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2022.123078.

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23

Hazi, Gabor, and Attila Markus. "On the bubble departure diameter and release frequency based on numerical simulation results." International Journal of Heat and Mass Transfer 52, no. 5-6 (February 2009): 1472–80. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.09.003.

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24

Gao, Wenzhong, Jiaye Qi, Xuan Yang, Jiahao Zhang, and Dawei Wu. "Experimental investigation on bubble departure diameter in pool boiling under sub-atmospheric pressure." International Journal of Heat and Mass Transfer 134 (May 2019): 933–47. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.01.024.

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25

Najim, Abdul, and Anil R. Aacharya. "Experimental Study of Effect of Nucleation Site Size on Bubble Dynamics during Nucleate Pool Boiling Heat Transfer." Applied Mechanics and Materials 592-594 (July 2014): 1596–600. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1596.

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In this paper, effect of nucleation site size on bubble dynamics during nucleate pool boiling heat transfer in saturated water is studied experimentally. Single bubble was generated using right angle tip of a hypodermic needle as a nucleation site. The hypodermic needles were used of inner diameters 0.413mm, 0.514mm, and 0.603 mm with a constant depth of 25mm. The bubble dynamics was studied using SONY Cyber-shot DSC-H100 camera operating at 30 frames per second at atmospheric pressure and at a wall superheat of 5K. The results show that, bubble diameter, bubble height and bubble volume increases with increase in diameter of nucleation site. The bubble growth period is found to be dependent on nucleation site size, and it decreases with increase in diameter of nucleation site. This happens because as volume of vapor bubble increases, buoyancy force starts dominates the capillary force and bubble detaches earlier. Effect of nucleation site size on bubble departure diameter and bubble release frequency is also discussed.

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26

Jaikumar, A., T. S. Emery, and S. G. Kandlikar. "Interplay between developing flow length and bubble departure diameter during macroconvection enhanced pool boiling." Applied Physics Letters 112, no. 7 (February 12, 2018): 071603. http://dx.doi.org/10.1063/1.5016307.

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27

Lim, Do Yeong, and In Cheol Bang. "Controlled bubble departure diameter on biphilic surfaces for enhanced pool boiling heat transfer performance." International Journal of Heat and Mass Transfer 150 (April 2020): 119360. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119360.

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28

Zhang, Lenan, Shuai Gong, Zhengmao Lu, Ping Cheng, and Evelyn N. Wang. "A unified relationship between bubble departure frequency and diameter during saturated nucleate pool boiling." International Journal of Heat and Mass Transfer 165 (February 2021): 120640. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120640.

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29

Hamzekhani, S., M. Maniavi Falahieh, and A. Akbari. "Bubble departure diameter in nucleate pool boiling at saturation: Pure liquids and binary mixtures." International Journal of Refrigeration 46 (October 2014): 50–58. http://dx.doi.org/10.1016/j.ijrefrig.2014.07.003.

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30

Dzienis, Paweł, Romuald Mosdorf, Daniel Tomaszuk, and Wiotold Suchecki. "Formation of bubble chains over twin nozzles." MATEC Web of Conferences 240 (2018): 05039. http://dx.doi.org/10.1051/matecconf/201824005039.

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In the paper the formation of bubble chains over two nozzles has been experimentally investigated and modelled. Bubbles were generated from twin brass nozzles (with the inner diameter equal to 1 mm) to distilled water. The appearance and disappearance of alterative bubble departures have been investigated. It has been found that during disappearance of alternative bubble departures bubbles depart from nozzle outlets simultaneously. The PIV method was used to reconstruct the liquid velocity field around the bubble chains. The results of experiment were comparing with results of numerical simulation in which the Level Set method has been used. The PIV method show that during the alternate bubble departures the range of the velocity field formed by the bubble chain is smaller than in case when bubbles depart in non-alternative way. In this case the bubbles velocity above the nozzles outlet is greater in comparison with bubble velocity during the simultaneously bubble departures. The numerical simulations show that in alternative bubble departures bubble just after its departure is attracted to the common bubble chain. The hydrodynamic interactions between departing bubbles lead to uniform distribution of bubbles in bubble chain.

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31

Sugrue, R., and J. Buongiorno. "A modified force-balance model for prediction of bubble departure diameter in subcooled flow boiling." Nuclear Engineering and Design 305 (August 2016): 717–22. http://dx.doi.org/10.1016/j.nucengdes.2016.04.017.

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32

Colombo, Marco, Ronak Thakrar, Michael Fairweather, and Simon P. Walker. "Assessment of semi-mechanistic bubble departure diameter modelling for the CFD simulation of boiling flows." Nuclear Engineering and Design 344 (April 2019): 15–27. http://dx.doi.org/10.1016/j.nucengdes.2019.01.014.

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33

Izumi, Masaaki, Masaki Oh-uchi, Norio Yamakawa, Toshiro Takeyama, and J. W. Westwater. "Estimation of dropwise condensation heat transfer on rough surface by using statical departure drop diameter." KAGAKU KOGAKU RONBUNSHU 14, no. 3 (1988): 381–86. http://dx.doi.org/10.1252/kakoronbunshu.14.381.

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34

Burdeina, Vyktoryia, Hanna Hrinchenko, Svitlana Artiukh, and Andrii Trishch. "ESTIMATION OF ACCURACY OF COORDINATED SMALL DIAMETER HOLES WITH CUTTING TOOL DIRECTION." Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies, no. 2(8) (June 15, 2021): 9–14. http://dx.doi.org/10.20998/2413-4295.2021.02.02.

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The dimensional analysis of the initial parameters of the coordinated dimensions of the holes is presented. Issues related to the assessment of the accuracy of the location of the surfaces of deep holes are considered. The influence of various technological factors on the magnitude of scattering of coordinated dimensions is studied. Experimental studies using experimental design methodology, which was used for sample preparations 45 steel, cast iron SCH15, aluminum alloys. Factors such as the cutting angle, the hardness of the workpiece, the cutting force and their effect on the diameter of the impression and its depth were studied. As a result of the experiments, a slight effect of the drilling force on the diameter and depth of the impression was found. However, it was found that the angle of the core leads to a directly proportional increase in the diameter of the imprint and inversely affects its depth. The hardness of the material has a more significant effect on the diameter of the imprint than on its depth. The total influence of controlled factors significantly affects the diameter of the imprint. Minimum core drilling angles are proposed for some materials. A mathematical model of the accuracy of machining coordinated holes is proposed on the basis of estimating the coefficients of the regression equation and finding the required mathematical models of the scattering fields of dimensions and deviations. As factors that vary during the drilling of coordinated holes, were taken: the length of the conductor sleeve, the departure of the tool, the hardness of the workpiece, the diameter of the tool. It is found that with increasing tool diameter and guide sleeve length decreases the amount of dimensional scattering from the base and positional deviations, and increasing tool departure and improving the physical and mechanical properties of the workpiece increase the size of the size scattering field from the base and positional deviation. An additional factor was introduced: the gap in the combination between the cutting tool and the conductor sleeve and obtained mathematical dependences of the influence of factors on dimensional accuracy when machining deep holes with the direction of the cutting tool. It is shown that the introduction of an additional factor - the gap, did not change the essence of the process of errors on small aggregate machines, and the change in diameters does not lead to a significant increase in scattering fields.

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35

XIAO, BOQI. "A NEW ANALYTICAL MODEL FOR HEAT TRANSFER IN POOL BOILING." Modern Physics Letters B 24, no. 12 (May 20, 2010): 1229–36. http://dx.doi.org/10.1142/s0217984910023256.

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In this paper, dependence of active nucleation site density on boiling surfaces are developed. For pool boiling heat transfer, a mathematical model is derived based on statistical treatment using the probability density function of the cavity mouth radius and existing correlation for active nucleation site density, the volume of single bubble at departure, the bubble departure diameter and the bubble departure frequency. The proposed model is expressed as a function of wall superheat, the contact angle, maximum and minimum active cavities, and physical properties of fluid. It is shown that the wall heat flux can be determined by the consideration of the variation of the cavity mouth radius. A good agreement between the proposed model predictions and experimental data is found for different contact angles. It also turns out that the present model explains well the mechanism on how wettability affects the pool boiling.

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36

Fedoseev, Alexander V., Mikhail V. Salnikov, Anastasiya E. Ostapchenko, and Anton S. Surtaev. "Lattice Boltzmann Simulation of Optimal Biphilic Surface Configuration to Enhance Boiling Heat Transfer." Energies 15, no. 21 (November 3, 2022): 8204. http://dx.doi.org/10.3390/en15218204.

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To study the processes of boiling on a smooth surface with contrast wettability, a hybrid model was developed based on Lattice Boltzmann method and heat transfer equation. The model makes it possible to describe the phenomena of natural convection, nucleate boiling, and transition to film boiling, and, thus, to study heat transfer and the development of crisis phenomena in a wide range of surface superheats and surface wetting characteristics. To find the optimal configuration of the biphilic surface, at the first stage a numerical simulation was carried out for a single lyophobic zone on a lyophilic surface. The dependences of the bubble departure frequency and the departure diameter of the bubble on the width of the lyophobic zone were obtained, and its optimal size was determined. At the next stage, the boiling process on an extended surface was studied in the presence of several lyophobic zones of a given size with different distances between them. It is shown that in the region of moderate surface superheat, the intensity of heat transfer on biphilic surfaces can be several times (more than 4) higher compared to surfaces with homogeneous wettability. Based on numerical calculations, an optimal configuration of the biphilic surface with the ratios of the lyophobic zones’ width of the order of 0.16 and the distance between the lyophobic zones in the range of 0.9–1.3 to the bubble departure diameter was found.

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37

Bovard, Samaneh, Hoda Asadinia, Goharshad Hosseini, and S. A. Alavi Fazel. "Investigation and experimental analysis of the bubble departure diameter in pure liquids on horizontal cylindrical heater." Heat and Mass Transfer 53, no. 4 (August 23, 2016): 1199–210. http://dx.doi.org/10.1007/s00231-016-1885-3.

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38

Kaniowski, Robert, and Robert Pastuszko. "Pool boiling of ethanol and FC-72 on open microchannel surfaces." EPJ Web of Conferences 180 (2018): 02042. http://dx.doi.org/10.1051/epjconf/201818002042.

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The paper presents experimental investigations into pool boiling heat transfer for open microchannel surfaces. Parallel microchannels fabricated by machining were about 0.3 mm wide, and 0.2 to 0.5 mm deep and spaced every 0.1 mm. The experiments were carried out for ethanol, and FC-72 at atmospheric pressure. The image acquisition speed was 493 fps (at resolution 400 × 300 pixels with Photonfocus PHOT MV-D1024-160-CL camera). Visualization investigations aimed to identify nucleation sites and flow patterns and to determine the bubble departure diameter and frequency at various superheats. The primary factor in the increase of heat transfer coefficient at increasing heat flux was a growing number of active pores and increased departure frequency. Heat transfer coefficients obtained in this study were noticeably higher than those from a smooth surface.

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39

Kumar, Nitish, Pradyumna Ghosh, and P. Shukla. "Development of an approximate model for the prediction of bubble departure diameter in pool boiling of water." International Communications in Heat and Mass Transfer 127 (October 2021): 105531. http://dx.doi.org/10.1016/j.icheatmasstransfer.2021.105531.

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Phan, Hai Trieu, Nadia Caney, Philippe Marty, Stéphane Colasson, and Jérôme Gavillet. "A model to predict the effect of contact angle on the bubble departure diameter during heterogeneous boiling." International Communications in Heat and Mass Transfer 37, no. 8 (October 2010): 964–69. http://dx.doi.org/10.1016/j.icheatmasstransfer.2010.06.024.

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41

Suszko, Arthur, and Mohamed S. El-Genk. "Saturation boiling of PF-5060 on rough Cu surfaces: Bubbles transient growth, departure diameter and detachment frequency." International Journal of Heat and Mass Transfer 91 (December 2015): 363–73. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.07.083.

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Raj, Sumit, Manabendra Pathak, and Mohd Kaleem Khan. "An analytical model for predicting growth rate and departure diameter of a bubble in subcooled flow boiling." International Journal of Heat and Mass Transfer 109 (June 2017): 470–81. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.02.026.

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Zhou, Jie, Yonghai Zhang, and Jinjia Wei. "A modified bubble dynamics model for predicting bubble departure diameter on micro-pin-finned surfaces under microgravity." Applied Thermal Engineering 132 (March 2018): 450–62. http://dx.doi.org/10.1016/j.applthermaleng.2017.12.113.

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Khoshnevis, Ahmad, Araz Sarchami, and Nasser Ashgriz. "Effect of nucleation bubble departure diameter and frequency on modeling subcooled flow boiling in an annular flow." Applied Thermal Engineering 135 (May 2018): 280–88. http://dx.doi.org/10.1016/j.applthermaleng.2018.02.032.

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Tarasenko, S. V., P. V. Tarakanov, A. A. Natalskiy, A. V. Pavlov, and E. A. Dronova. "The main arterial vessels of pancreatic isthmus and their importance in surgery." Kazan medical journal 101, no. 1 (February 11, 2020): 53–57. http://dx.doi.org/10.17816/kmj2020-53.

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Aim. To optimize the ways of cross-section of the pancreas in its isthmus, taking into account the topography of the main arteries of this area. Methods. 43 organocomplexes representing pancreas with duodenum were studied. Injection mass was injected into arterial vessels with subsequent fixation in 4% formalin solution and final preparation of complexes. The main arteries of the isthmus of the pancreas, their places of origin and topography were evaluated. Results. The main arteries of the isthmus of the pancreas are the peripancreatic artery and the additional artery of the isthmus of the pancreas. Peripancreatic artery was observed in 97.67% of cases; it departed from the dorsal pancreatic artery in 93% of cases, from the third branch of the splenic artery in 7% of cases. The diameter at the point of departure was 1.610.12 mm. In 95.3%, the artery passed along the lower edge of pancreatic isthmus. The peripancreatic artery was connected to the gastroduodenal artery or its branches. The diameter of peripancreatic artery at the junction was 1.550.1 mm. An additional artery of the isthmus of the pancreas was found in 93% of cases. In 76.74% it departed from the basin of the dorsal pancreatic artery, in 9.3% from another branch of the splenic artery, in 13.95% directly from the splenic artery itself. The diameter at the point of departure was 1.060.1 mm. It passed along the upper edge of pancreatic isthmus and connected to the pool of the gastroduodenal artery. The diameter at the junction was 0.980.1 mm. The diameter of peripancreatic artery was 1.950.05 mm in the trunk type versus 1.480.05 mm in the branched type of blood supply. The diameter of the additional artery of the isthmus of the pancreas had no pronounced changes depending on the type of blood supply to the pancreas. Conclusion. The topography of the main arteries of the isthmus of the pancreas is constant and does not depend on their diameter and place of origin. The most vascularized zones of the isthmus of the pancreas are its lower and upper edges.

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Kern, Ju¨rgen, and Peter Stephan. "Investigation of Decisive Mixture Effects in Nucleate Boiling of Binary Mixtures Using a Theoretical Model." Journal of Heat Transfer 125, no. 6 (November 19, 2003): 1116–22. http://dx.doi.org/10.1115/1.1622716.

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In the present paper an attempt is made to clarify the influence of mixture effects upon heat transfer in nucleate boiling of binary mixtures. The studies are based on a theoretical model that is briefly summarized. Evaluating heat and mass transfer around a single vapor bubble emphasizes a strong influence of the so-called micro region where the liquid-vapor phase interface approaches the wall. Due to the preferential evaporation of one component of the mixture, strong concentration gradients occur in the micro region. These microscale composition effects cause diffusive mass transfer, Marangoni convection, and a variation of the liquid-vapor phase equilibrium as well as a variation of the thermophysical properties. From a macroscopic point of view the bubble site density and the departure diameter vary with the composition of the liquid. By means of parameter studies decisive mixture effects are identified and their relevance in the nucleate boiling process is stated. The heat transfer coefficient crucially depends on the bubble site density and departure diameter. For increasing bubble site density, the influence of microscopic concentration gradients increases. But only the variation of liquid-vapor phase equilibrium becomes important, while diffusive mass transfer and Marangoni convection can be neglected.

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Stojanovic, Andrijana, Srdjan Belosevic, Nenad Crnomarkovic, Ivan Tomanovic, and Aleksandar Milicevic. "Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters." Thermal Science, no. 00 (2021): 69. http://dx.doi.org/10.2298/tsci200111069s.

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Understanding nucleate pool boiling heat transfer and, in particular the accurate prediction of conditions that can lead to critical heat flux, is of the utmost importance in many industries. Due to the safety issues related to the nuclear power plants, and for the efficient operation of many heat transfer units including fossil fuel boilers, fusion reactors, electronic chips, etc., it is important to understand this kind of heat transfer. In this paper, a comprehensive review of analytical and numerical work on nucleate pool boiling heat transfer is presented. In order to understand this phenomenon, existing studies on boiling heat transfer coefficient and boiling heat flux are also discussed, as well as characteristics of boiling phenomena such as bubble departure diameter, bubble departure frequency, active nucleation site density, bubble waiting and growth period and their impact on pool boiling heat transfer.

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Cavalcanti, Renata da Silva, Severino Rodrigues de Farias Neto, and Eudésio Oliveira Vilar. "A computational fluid dynamics study of hydrogen bubbles in an electrochemical reactor." Brazilian Archives of Biology and Technology 48, spe (June 2005): 219–29. http://dx.doi.org/10.1590/s1516-89132005000400027.

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Most electrochemical reactors present reactions with the growth and departure of gas bubbles which influence on the reactor hydrodynamics and this study is usually complex, representing a vast field for research. The present paper had as objective to study a bi-phase (gas-liquid) system aiming to foresee the influence of departure of hydrogen bubbles generated on effective electrode surface situated on cathodic semi-cell. Nevertheless, it was idealized that the gas was injected into the semi cell, through the effective electrode surface With this hypothesis, it was possible to study, and numerically analyze, the hydrodynamic behavior of the hydrogen bubbles in the interior of the study domain, applying concepts of computational fluid dynamics by using the computational applicative CFX-4 for the application of the MUSIG ("MUltiple-SIze-Group") model, taking into consideration the phenomena of coalescence and the distribution of the diameter of the bubbles.

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Cho, Yun-Je, Soo-Been Yum, Jeong-Hun Lee, and Goon-Cherl Park. "Development of bubble departure and lift-off diameter models in low heat flux and low flow velocity conditions." International Journal of Heat and Mass Transfer 54, no. 15-16 (July 2011): 3234–44. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.04.007.

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Chen, Hanzhi, Gaofei Chen, Xin Zou, Yuan Yao, and Maoqiong Gong. "Experimental investigations on bubble departure diameter and frequency of methane saturated nucleate pool boiling at four different pressures." International Journal of Heat and Mass Transfer 112 (September 2017): 662–75. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.05.031.

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