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Bubble Dynamics In Nucleate Boiling Heat Transfer
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Book Synopsis Bubble Dynamics in Nucleate Boiling Heat Transfer by : Ritchie Deane Mikesell
Download or read book Bubble Dynamics in Nucleate Boiling Heat Transfer written by Ritchie Deane Mikesell and published by . This book was released on 1958 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Nucleate Boiling Bubble Dynamics in Normal and Zero Gravities by : Thomas H. Cochran
Download or read book Experimental Investigation of Nucleate Boiling Bubble Dynamics in Normal and Zero Gravities written by Thomas H. Cochran and published by . This book was released on 1968 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamic Aspects of Boiling Heat Transfer by : N. Zuber
Download or read book Hydrodynamic Aspects of Boiling Heat Transfer written by N. Zuber and published by . This book was released on 1959 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Nucleate Boiling Bubble Dynamics and Heat Transfer Enhancement on Printed Bi-functional Surfaces by : Michele David
Download or read book Experimental Study of Nucleate Boiling Bubble Dynamics and Heat Transfer Enhancement on Printed Bi-functional Surfaces written by Michele David and published by . This book was released on 2016 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boiling heat transfer is studied for its ability to dissipate high fluxes and achieve heat transfer coefficients two orders of magnitude greater than single-phase heat transfer systems. Heater surface enhancement with increased surface area, varied geometry, wettability contrast and micro/nano-structures can further enhance boiling heat transfer performance through bubble nucleation augmentation. Bubble nucleation control, growth and departure dynamics is important in understanding boiling phenomena and enhancing nucleate boiling heat transfer performance. Bi-functional surfaces for enhanced boiling heat transfer were fabricated and studied through investigation of bubble dynamics and pool boiling experiments. For the fabrication of the surface, hydrophobic polymer dot arrays are first printed on a substrate, followed by hydrophilic ZnO nanostructure deposition via microreactor-assisted nanomaterial deposition (MAND) processing. Wettability contrast between the hydrophobic polymer dot arrays and aqueous ZnO solution allows for the fabrication of surfaces with distinct wettability regions. Bi-functional surfaces with various configurations were fabricated and their bubble dynamics were examined at elevated heat flux, revealing various nucleate boiling phenomena. In particular, aligned and patterned bubbles with a tunable departure frequency and diameter were demonstrated in a boiling experiment for the first time. A pool boiling experimental facility has been designed and built to investigate nucleate pool boiling in water at atmospheric pressure. Resulting boiling curves of enhanced surfaces showed up to 3X enhancement in heat transfer coefficients at the same surface superheat using bi-functional surfaces, compared to a bare stainless steel surface. The surfaces show promising results for energy savings in two-phase change applications.
Book Synopsis Survey of the Literature Pertaining to the Phenomena of Nucleate Boiling by : R. A. Rockow
Download or read book Survey of the Literature Pertaining to the Phenomena of Nucleate Boiling written by R. A. Rockow and published by . This book was released on 1959 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Wall Thermal Properties on Bubble Dynamics and Heat Transfer in Nucleate Boiling by : P. S. Roberts
Download or read book The Influence of Wall Thermal Properties on Bubble Dynamics and Heat Transfer in Nucleate Boiling written by P. S. Roberts and published by . This book was released on 1984 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Contribution Towards the Numerical Study of Bubble Dynamics in Nucleate Boiling at Local Scale Using a Conservative Level Set Method by : Muhammad Sajid
Download or read book A Contribution Towards the Numerical Study of Bubble Dynamics in Nucleate Boiling at Local Scale Using a Conservative Level Set Method written by Muhammad Sajid and published by . This book was released on 2010 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nucleate boiling is an efficient means of heat transfer that has been the subject of many studies which have lead to more empirical results than knowledge on the physical mechanisms that govern the phenomena. In this work, a conservative level set method (LSM) was applied to the study of bubble dynamics during nucleate pool boiling which reduces the computational cost of reinitialization techniques traditionally used with LSM to limit phase loss. Also a force-balance approach to modelling dynamic apparent contact angle (CA) was proposed in this study based on the physics of the moving contact line (CL). It was tested against the traditional CL velocity approach and validated in comparison to available experimental data. In comparison to the CL velocity model our approach reduces the non-physical stick/slip behaviour of the CL and allows a smoother transition from the minimum receding to the maximum advancing CA, which is more akin to the physical phenomena. It was also demonstrated that the heat transfer during bubble growth is proportional to the apparent CA.
Book Synopsis Bubble Dynamics and Heat Transfer in Pool Boiling on Wires at Different Gravity by : Jian-Fu Zhao
Download or read book Bubble Dynamics and Heat Transfer in Pool Boiling on Wires at Different Gravity written by Jian-Fu Zhao and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experimental studies on bubble dynamical behaviors and heat transfer in pool boiling on thin wires in different gravity conditions have been performed in the past years, including experiments in long-term microgravity aboard the 22nd Chinese recoverable satellite RS-22, in short-term microgravity in the drop tower Beijing, and in normal gravity on the ground. Steady pool boiling of degassed R113 on thin platinum wires has been studied using a temperature-controlled heating method. A voltage-controlled heating method has also been used in normal gravity. A slight enhancement of nucleate boiling heat transfer is observed in microgravity, while dramatic changes of bubble behaviors are very evident. Considering the influence of the Marangoni effects, the different characteristics of bubble behaviors in microgravity have been explained. A new bubble departure model including the influence of the Marangoni effects has also been proposed, which can predict the whole observation both in microgravity and in normal gravity. The value of CHF (critical heat flux) in microgravity is lower than that in normal gravity, but it can be predicted well by the Lienhard-Dhir correlation, although the dimensionless radius, or the square root of the Bond number, in the present case is far beyond its initial application range. A further revisit on the scaling of CHF with heater radius in normal gravity, which is focused on the case of a small Bond number, has also been performed in our laboratory using different kinds of working fluids at different subcooling conditions. Interactions between the influences of the subcooling and heater radius will be important for the case of a small Bond number. In addition to the Bond number, there may exist some other parameters, which may be material-dependent, that play important roles in the CHF phenomenon with a small Bond number.
Book Synopsis Forces Acting on Bubbles in Nucleate Boiling Under Normal and Reduced Gravity Conditions by : Edward G. Keshock
Download or read book Forces Acting on Bubbles in Nucleate Boiling Under Normal and Reduced Gravity Conditions written by Edward G. Keshock and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhanced Boiling Heat Transfer by : John R. Thome
Download or read book Enhanced Boiling Heat Transfer written by John R. Thome and published by CRC Press. This book was released on 1990-01-01 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive survey of boiling heat transfer augmentation, one of the most dynamic areas in the field. The text covers fundamental aspects of boiling augmentation and provides an in-depth treatment of enhanced boiling surface applications in industry.
Book Synopsis Bubble Dynamics and Boiling Heat Transfer by : Samuel Siedel
Download or read book Bubble Dynamics and Boiling Heat Transfer written by Samuel Siedel and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since boiling heat transfer affords a very effective means to transfer heat, it is implemented in numerous technologies and industries ranging from large power generation plants to micro-electronic thermal management. Although having been a subject of research for several decades, an accurate prediction of boiling heat transfer is still challenging due to the complexity of the coupled mechanisms involved. It appears that the boiling heat transfer coefficient is intimately related to bubble dynamics (i.e. bubble nucleation, growth and detachment) as well as factors such as nucleation site density and interaction between neighbouring and successive bubbles. In order to contribute to the understanding of the boiling phenomenon, an experimental investigation of saturated pool boiling from a single or two neighbouring artificial nucleation sites on a polished copper surface has been performed. The bubble growth dynamics has been characterized for different wall superheats and a experimental growth law has been established. The interaction between successive bubbles from the same nucleation site has been studied, showing the bubble shape oscillations that can be caused by these interactions. The forces acting on a growing bubble has been reviewed, and a complete momentum balance has been made for all stages of bubble growth. The curvature along the interface has been measured, and indications concerning the mechanism of bubble detachment have been suggested. The rise of bubble after detachment has been investigated, and the maximum velocity reached before a change of direction has been estimated and compared to existing models from the literature. The interaction between bubbles growing side by side has been studied: the generation and propagation of a wave front during the coalescence of two bubbles has been highlighted. As boiling heat transfer enhancement techniques are being imagined and developed, this study also focuses on the electrohydrodynamic enhancement technique. Boiling experiments have been performed in the presence of electric fields, and their effects on heat transfer and bubble dynamics have been characterized. Although the volume of the bubbles at detachment and the relationship between the bubble frequency and the wall superheat were not affected, the bubble growth curve was modified. The bubbles were elongated in the direction of the electric field, and this elongation was estimated and compared to other studies from the literature. The rising velocity of the bubble was reduced in the presence of electric field, and the behaviour of bubbles growing side by side was modified, the electric field causing the bubbles to repeal each other. These results, obtained in a fully controlled environment, provide compelling evidence that electric fields can be implemented to alter the bubble dynamics and subsequently heat transfer rates during boiling of dielectric fluids.
Book Synopsis Convective Heat and Mass Transfer by : S. Mostafa Ghiaasiaan
Download or read book Convective Heat and Mass Transfer written by S. Mostafa Ghiaasiaan and published by CRC Press. This book was released on 2018-06-12 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: Convective Heat and Mass Transfer, Second Edition, is ideal for the graduate level study of convection heat and mass transfer, with coverage of well-established theory and practice as well as trending topics, such as nanoscale heat transfer and CFD. It is appropriate for both Mechanical and Chemical Engineering courses/modules.
Book Synopsis Physical Science Under Microgravity: Experiments on Board the SJ-10 Recoverable Satellite by : Wenrui Hu
Download or read book Physical Science Under Microgravity: Experiments on Board the SJ-10 Recoverable Satellite written by Wenrui Hu and published by Springer Nature. This book was released on 2019-10-16 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the physical science experiments in a space microgravity environment conducted on board the SJ-10 recoverable satellite, which was launched on April 6th, 2016 and recovered on April 18th, 2016. The experiments described were selected from ~100 proposals from various institutions in China and around the world, and have never previously been conducted in the respective fields. They involve fluid physics and materials science, and primarily investigate the kinetic properties of matter in a space microgravity environment. The book provides a comprehensive review of these experiments, as well as the mission’s execution, data collection, and scientific outcomes.
Book Synopsis Heat Transfer, Vapour Bubble Dynamics and Sound Emission in Subcooled Nucleate Pool Boiling by : Andreas Bode
Download or read book Heat Transfer, Vapour Bubble Dynamics and Sound Emission in Subcooled Nucleate Pool Boiling written by Andreas Bode and published by . This book was released on 2004 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Nucleate Boiling Bubble Dynamics in Normal and Zero Gravities by : Thomas H. Cochran
Download or read book Experimental Investigation of Nucleate Boiling Bubble Dynamics in Normal and Zero Gravities written by Thomas H. Cochran and published by . This book was released on 1968 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Heat Transfer written by and published by Academic Press. This book was released on 1998-05-18 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer
Book Synopsis Bubble Dynamics and Forced Convection Boiling Heat Transfer with Low Velocity by : Longhu Li
Download or read book Bubble Dynamics and Forced Convection Boiling Heat Transfer with Low Velocity written by Longhu Li and published by . This book was released on 1993 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: