Relevant bibliographies by topics / Departure Diameter

Academic literature on the topic 'Departure Diameter'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Departure Diameter"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Departure Diameter"

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Glenn, Stephen T. "Effects of Carbon Nanotube Coating on Bubble Departure Diameter and Frequency in Pool Boiling on a Flat, Horizontal Heater." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7058.

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The effects of a carbon nanotube (CNT) coating on bubble departure diameter and frequency in pool boiling experiments was investigated and compared to those on a bare silicon wafer. The pool boiling experiments were performed at liquid subcooling of 10 degrees Celsius and 20 degrees Celsius using PF-5060 as the test fluid and at atmospheric pressure. High-speed digital image acquisition techniques were used to perform hydrodynamic measurements. Boiling curves obtained from the experiments showed that the CNT coating enhanced critical heat flux (CHF) by 63% at 10 degrees Celsius subcooling. The CHF condition was not measured for the CNT sample at 20 degrees Celsius subcooling. Boiling incipience superheat for the CNT-coated surface is shown to be much lower than predicted by Hsu's hypothesis. It is proposed that bubble nucleation occurs within irregularities at the surface of the CNT coating. The irregularities could provide larger cavities than are available between individual nanotubes of the CNT coating. Measurements from high-speed imaging showed that the average bubble departing from the CNT coating in the nucleate boiling regime (excluding the much larger bubbles observed near CHF) was about 75% smaller (0.26 mm versus 1.01 mm)and had a departure frequency that was about 70% higher (50.46 Hz versus 30.10 Hz). The reduction in departure diameter is explained as a change in the configuration of the contact line, although further study is required. The increase in frequency is a consequence of the smaller bubbles, which require less time to grow. It is suggested that nucleation site density for the CNT coating must drastically increase to compensate for the smaller departure diameters if the rate of vapor creation is similar to or greater than that of a bare silicon surface.
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Book chapters on the topic "Departure Diameter"

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Kolev, Nikolay Ivanov. "Bubble departure diameter." In Multiphase Flow Dynamics 3, 87–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21372-4_4.

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Pranoto, I., K. C. Leong, A. A. Rofiq, H. M. Arroisi, and M. A. Rahman. "Study on the Pool Boiling Bubble Departure Diameter and Frequency from Porous Graphite Foam Structures." In Advances in Heat Transfer and Thermal Engineering, 217–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_40.

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Kabungo Gakingo, Godfrey, and Tobias Muller Louw. "The Use of Computational Fluid Dynamics in the Analysis of Gas-Liquid-Liquid Reactors." In Advances in Mass Transfer [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99157.

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Gas–liquid–liquid reactors are typically found in bioprocess setups such as those used in alkane biocatalysis and biological gas stripping. The departure of such reactors from traditional gas–liquid setups is by the introduction of a secondary (dispersed) liquid phase. The introduction of the latter results in complicated hydrodynamics as observed through measurements of velocity fields, turbulence levels and mixing times. Similarly, changes in mass transfer occur as observed through measurements of gas hold up, bubble diameters and the volumetric mass transfer coefficients. The design and analysis of such reactors thus requires the adoption of an approach that can comprehensively account for the various observed changes. This chapter proposes Computational Fluid Dynamics as an approach fit for this purpose. Key considerations, successes and challenges of this approach are highlighted and discussed based on a review of previously published case studies.
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Conference papers on the topic "Departure Diameter"

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Jensen, Michael K., and Gary J. Memmel. "EVALUATION OF BUBBLE DEPARTURE DIAMETER CORRELATIONS." In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.1630.

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Tian, Ye, Wei Huang, Pengfei Li, Simin Cao, and Yan Sun. "Development of Bubble Departure Diameter Model Based on Force Analysis." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66549.

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Bubble departure diameter has significant effect on bubble dynamics and heat transfer in boiling system, and it is difficult to be measured in a boiling system. Therefore, a method to predict bubble departure diameter is necessary to study of bubble dynamics and heat transfer in boiling system. A new theoretical model based on force analysis is proposed for the prediction of bubble departure diameter in vertical boiling system in this paper. Surface tension force, unsteady drag force, quasi-steady drag force, shear lift force, buoyancy force, hydrodynamic pressure force and contact pressure force are taken into account to build the model. Chen’s experimental data is used to validate the model, the averaged relative deviation between the predict results of the model and the experimental data is less than ±14.8%.
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Xu, Jian-Jun, Bing-De Chen, and Xiao-Jun Wang. "Visualization of Bubble Growth and Departure in a Vertical Narrow Rectangular Channel." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29794.

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It is very important to study bubble growth and departure from the nucleation site for better understanding of boiling heat transfer in a narrow channel. Bubble growth and departure in a narrow rectangular under atmosphere pressure is visually observed by the wide and narrow side of the narrow rectangular channel using high speed digital camera. There is a small bubble contact diameter between the bubble base and heating surface when the bubble is growing at the nucleation site, and the growing bubble shape is almost spherical. The bubble growth law at the different nucleation sites is almost uniform under the condition of the same thermal parameters, but bubble departure diameters are obvious distinct because of different sizes of nucleation sites. In the current study, the bubble growth rate in a narrow rectangular channel is small, and the bubble departure time is long, the bubble growth diameter can be predicted by using the amendatory Zuber expression. The effect of thermal parameters on the mean bubble departure diameters is statistical analysed in the view window, the mean bubble departure diameters decrease with increasing heat flux, the mean bubble departure diameters decrease with increasing inlet subcooling, the mean bubble departure diameters decrease with increasing bulk flow velocity.
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Brooks, Caleb S., Nicolás Silin, Takashi Hibiki, and Mamoru Ishii. "Experimental Investigation of Bubble Departure Diameter and Bubble Departure Frequency in Subcooled Flow Boiling in a Vertical Annulus." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17308.

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Wall nucleation experiments have been performed in a vertical annulus test section for investigation of the bubble departure diameter and bubble departure frequency. The experimental data in forced convective subcooled boiling flow is presented as a parametric study of the effect of wall heat flux, local bulk liquid sub-cooling, liquid flow rate, and system pressure. The data is shown to extend the database currently available in literature to a wider range of system conditions. Along with the current database in forced convective flow, the available models for bubble departure size and frequency are reviewed and compared with the new data. The prediction of the bubble departure frequency is shown to require accurate modeling of the bubble departure diameter which has poor agreement with the experimental database.
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Du, Jingyu, Chenru Zhao, Hanliang Bo, and Yujia Zhou. "A Simplified Force-Balance Model to Predict Bubble Departure Diameter in Horizontal Flow Boiling." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81302.

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In this paper, a simplified force-balance model in horizontal flow boiling is proposed by introducing several dominant dimensionless parameters. Forces acting on a bubble attached in the direction parallel to the heating surface are analyzed completely, which include quasi-steady drag force, surface tension force and growth force in x-direction. When the force balance is broken in the x-direction before the y-direction, bubble will departure from the nucleation site immediately. Based on the force-balance analysis, bubble departure diameter is formulated to be a function of Jakob number, Reynolds number and Prandtl number. By analyzing the effects of dimensionless parameters, it is found higher Jakob number indicates larger bubble departure diameter, while the increase of Reynolds number will reduce the departure diameter. Besides, the simplified model is able to enlarge application of force-balance model under various dimensionless parameters and make the calculation of bubble departure diameter much easier. Finally, comparing with the experimental data reported in literature, the error between simplified force-balance model and experimental is about 25%.
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Akand, Md Abdur Rafiq, Kei Kitahara, Tatsuya Matsumoto, Wei Liu, and Koji Morita. "A Modified Model for the Net Vapor Generation Point and Its Application on CHF Prediction in Subcooled Flow Boiling." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64022.

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Abstract Critical heat flux (CHF) is one of the most significant thermal criteria for nuclear reactor design and safety in subcooled flow boiling. The accurate prediction capabilities of the characteristic size of departure bubbles are crucial for predicting the net vapor generation point (NVG) and CHF. An experimental research facility was designed to determine the bubble departure diameter and subcooling at the net vapor generation point, not only for vertical flow boiling but also in any orientation between vertical and downward-facing horizontal. An improved force-balanced model is proposed to calculate the bubble departure diameter at the net vapor generation point to predict CHF in vertical subcooled flow boiling. The force-balance equation was solved numerically through iteration to calculate the bubble departure diameter using a novel MATLAB script. The net vapor generation point was modified using the bubble departure diameter obtained from the proposed model. The model agrees well with the experimental data. Finally, the modified departure diameter and NVG were applied to the liquid sublayer dryout model to predict the CHF on upward subcooled flow boiling. It was found that the model predicts the experimental CHF data with an average relative error of 7.17%.
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Jie, Yang, Jianjun Wang, Puzhen Gao, and Huang Ying. "The Numerical Simulation of the Detachment Characteristic of Bubble in Narrow Channels With Different Width." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67203.

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The plate-type fuel element is widely used in ship-based nuclear reactors. The typical coolant channel in such reactor is a narrow rectangular one with a relatively large aspect ratio. The thermal-hydraulic characteristics in narrow rectangular channels may be different from that in conventional pipe. It could be expected that the geometry of narrow channels has some impact on the bubble behaviors in subcooled flow boiling. In this paper, the bubble behaviors were simulated by using CFD software FLUENT in narrow rectangular channel with different widths under both stagnation conditions and flow conditions. The main concern was placed on the parameters of bubble departure time, departure diameter and departure velocity. In the model setup process, the VOF model and PISO algorithm were selected. The results were compared against the experimental data and showed the models good capability of capturing the interface between gas and liquid. Furthermore, for stagnation cases, the width of the channel played an important role for bubble departure diameter. In flow cases, the width also had a great impact on departure diameter and departure velocity as well. The departure time and departure velocity showed strong relevance with each other under different contact angle conditions.
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Shaligram, Avinash, and Sandip Kumar Saha. "Application of Dynamic Bubble Departure Model for New, Low-GWP Refrigerants on Enhanced, Structured Surfaces." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71324.

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Structured surfaces consisting of sub-surface tunnels and openings in the form of pores or gaps are used to enhance boiling heat transfer resulting into compact heat exchangers. One of the applications of enhanced surface tubes is in flooded evaporators in water chillers. The fundamental mechanisms in nucleate boiling on structured surfaces are not still well understood, especially for new, low-GWP refrigerants. In this study, the focus is on bubble departure models. Most of the nucleate boiling models consider the static force model for calculating bubble diameter at the departure. However as per flow visualization studies in published literatures, the process of bubble growth and departure is dynamic and hence three more forces (in addition to buoyancy and surface tension) need to be accounted for while calculating the instantaneous bubble departure diameter. In this study, numerical results are presented for bubble departure diameter for four refrigerants, viz. R134a (the currently used, high GWP refrigerant) and its targeted low-GWP replacements, viz. R1234ze (E), R513A and R450A on enhanced, structured surfaces. Results from the dynamic force model show the bubble departure diameter in the range of 0.78 mm to 0.85 mm for all the four refrigerants. The unsteady growth force ranges from 4.8 × 10−6 N to 1.35 × 10−5 N while the surface tension force ranges from 2.49 × 10−6 N to 1.975 × 10−6 N. Similar results are provided for other forces as a function of wall superheat.
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Ignacio da Silva, Isabela, Bruno de Andrade, Leonardo Manetti, Jeferson Diehl de Oliveira, and Elaine Maria Cardoso. "SATURATION BOILING OF HFE-7100 ON COPPER SURFACES: BUBBLE DEPARTURE DIAMETER AND BUBBLE FREQUENCY." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0204.

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Chen, Weihong, Ang Guo, and Lixin Yang. "Experimental Investigation of Wall Nucleate Boiling Models in Narrow Channel." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16579.

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Using deionized water as working medium, studies on visualization of the behavior of subcooled boiling bubbles in narrow rectangular channels have been conducted at atmospheric pressure, with the help of a high-speed digital camera. The effects of wall superheat, fluid subcooling and mass flux on the bubble dynamic model of nucleation site density, bubble departure frequency and bubble departure diameter were investigated. This paper analyzed the visual graphic results and obtained quantitative values about bubble nucleation site density, bubble departure frequency and bubble departure diameter under different conditions. Based on the results, wall nucleate boiling models in the conventional channel put forward by Nilanjana Basu have been corrected. The new correlation agrees reasonably well with existing experimental data in 2mm narrow rectangular channel.
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Reports on the topic "Departure Diameter"

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Yoo, Jun Soo. Bubble Departure Diameter and Bubble Release Frequency Measurement from TAMU Subcooled Flow Boiling Experiment. Office of Scientific and Technical Information (OSTI), December 2016. http://dx.doi.org/10.2172/1364235.

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