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Condensation Droplet Growth In Rarefied Gases
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Book Synopsis Condensation Droplet Growth in Rarefied Gases by : Sang-Wook Kang
Download or read book Condensation Droplet Growth in Rarefied Gases written by Sang-Wook Kang and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation Droplet Growth in Rarefied Gases by : Sang-Wook Kang
Download or read book Condensation Droplet Growth in Rarefied Gases written by Sang-Wook Kang and published by . This book was released on 1967 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensational Droplet Growth in Rarefied Quiescent Vapor and Forced Convective Conditions by : Sushant Anand
Download or read book Condensational Droplet Growth in Rarefied Quiescent Vapor and Forced Convective Conditions written by Sushant Anand and published by . This book was released on 2011 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase Heat transfer is ubiquitous in diverse fields of application such as cooling systems, micro and mini power systems and many chemical processes. By now, single phase dynamics are mostly understood in their applications in vast fields, however multiphase systems especially involving phase changes are still a challenge. Present study aims to enhance understanding in this domain especially in the field of condensation heat transfer. Of special relevance to present studies is study of condensation phenomenon for detection of airborne nanoparticles using heterogeneous nucleation. Detection of particulate matter in the environment via heterogeneous condensation is based on the droplet growth phenomenon where seeding particles in presence of supersaturated vapor undergo condensation on their surface and amplify in size to micrometric ranges, thereby making them optically visible. Previous investigations show that condensation is a molecular exchange process affected by mean free path of vapor molecules ([lambda]) in conjunction with size of condensing droplet (d), which is measured in terms of Knudsen number (Kn=[lambda]/d). In an event involving heterogeneous nucleation with favorable thermodynamic conditions for condensation to take place, the droplet growth process begins with accretion of vapor molecules on a surface through random molecular collision (Kn>1) until diffusive forces start dominating the mass transport process (Kn“1). Knowledge of droplet growth thus requires understanding of mass transport in both of these regimes. Present study aims to understand the dynamics of the Microthermofluidic sensor which has been developed, based on above mentioned fundamentals. Using continuum approach, numerical modeling was carried to understand the effect of various system parameters for improving the device performance to produce conditions which can lead to conditions abetting condensational growth. The study reveals that the minimum size of nanoparticle which can be detected is critically dependent upon controlling wall geometry and size, wall temperature, flow rate and relative humidity of nanoparticle laden air stream. Droplet growths rates and sizes have been predicted based on different models. The efficacy of the device under various conditions has been measured in terms of its ability to activate nanoparticles of different sizes. Since the condensation mechanism is dependent upon the Knudsen regime in which droplets are growing via condensation, special consideration was made to understand their behavior in large Knudsen number conditions. For this purpose, ESEM was used to study condensation on a bare surface. Droplet growth obtained as a function of time reveals that the rate of growth decreases as the droplet increases in size. The experimental results obtained from these experiments were matched with theoretical description provided by a model based on framework of kinetic theory. Evidence was also found which establishes the presence of submicroscopic droplets nucleating and growing in between microscopic droplets for partially wetting case.
Book Synopsis The Physics of Dew, Breath Figures and Dropwise Condensation by : Daniel Beysens
Download or read book The Physics of Dew, Breath Figures and Dropwise Condensation written by Daniel Beysens and published by Springer Nature. This book was released on 2022-01-31 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the author focuses on the physics behind dew, breaths figures, and dropwise condensation phenomena to introduce scientists, engineers and students to the many original processes involved in condensation. Consisting of 15 Chapters, 18 Appendices and over 500 references, the reader learns the needed theoretical backgrounds and formulae to understand the complexity of dropwise condensation. Heat and mass transfer, nucleation and growth on various substrates are considered (solid, liquid, plastic, undergoing phase change or micro-patterned substrates). The particular role of thermal or geometrical discontinuities where growth can be enhanced or reduced, dynamical aspects of self-diffusion, problems related to drop collection by gravity and the optics of dropwise condensation are all discussed. Although the content mainly deals with condensation from humid air, it can readily be generalized to condensation of any substance. The specificities of pure vapor condensation (e.g. steam) are also examined. Numerous images are provided within the text to illustrate the physics. This book is meant for those studying or researching dew and dropwise condensation, but also for individuals wishing to develop their knowledge on the subject.
Book Synopsis Condensation of Vapor as Induced by Nuclei and Ions by : Carl Barus
Download or read book Condensation of Vapor as Induced by Nuclei and Ions written by Carl Barus and published by . This book was released on 1908 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rarefied Gas Dynamics by : O.M. Belotserkovskii
Download or read book Rarefied Gas Dynamics written by O.M. Belotserkovskii and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 697 pages. Available in PDF, EPUB and Kindle. Book excerpt: 100 keV) of neutral hydrogen 7 atoms . The design of the cesium jettarget intended to achieve the 7 following goals : - Supersonic nozzle - cooled skimmer system to increase the fraction 8 of the total nozzle flux Jn which is used as the jettarget flux Jt, 8 = Jt/Jn, from low values 8
Book Synopsis Rarefied Gas Dynamics by : Hakurō Oguchi
Download or read book Rarefied Gas Dynamics written by Hakurō Oguchi and published by . This book was released on 1984 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth of Spherical Droplets by Condensation in a Quiescent, Free Molecular Environment by : Benjamin J. C. Wu
Download or read book Growth of Spherical Droplets by Condensation in a Quiescent, Free Molecular Environment written by Benjamin J. C. Wu and published by . This book was released on 1975 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approximate, explicit solutions to the simultaneous heat and mass transfer equations governing the growth of spherical droplets by condensation in a quiescent, supersaturated vapor have been obtained. Free molecule flow conditions are assumed. The temperature and growth rate of droplets under the 'near thermal equilibrium' and 'near saturation' conditions are given as explicit functions of the thermodynamic state of the gaseous phase and the droplet size only. The 'near saturation', and 'near equilibrium' conditions are satisfied in the practical cases of droplets growing in a pure vapor, and a dilute mixture of a vapor with a noncondensing carrier gas, respectively. The accuracy of the approximation formulas is quite satisfactory; for the typical conditions tested, the maximum error is a few percent.
Book Synopsis Condensation of Vapor as Induced by Nuclei and Ions by : Carl Barus
Download or read book Condensation of Vapor as Induced by Nuclei and Ions written by Carl Barus and published by . This book was released on 1907 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rarefied Gas Dynamics by : Bernie D. Shizgal
Download or read book Rarefied Gas Dynamics written by Bernie D. Shizgal and published by AIAA. This book was released on 1994 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetic Theory of Cloud Droplet Growth by Condensation by : Norman F. Robinson
Download or read book Kinetic Theory of Cloud Droplet Growth by Condensation written by Norman F. Robinson and published by . This book was released on 1979 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Abstract Bulletin by : Defense Documentation Center (U.S.)
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis OAR Cumulative Index of Research Results by : United States. Air Force. Office of Aerospace Research
Download or read book OAR Cumulative Index of Research Results written by United States. Air Force. Office of Aerospace Research and published by . This book was released on 1965 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Light Scattering Investigation of Droplet Growth in Nozzle Condensation by : Richard Roberts (Sc. D.)
Download or read book A Light Scattering Investigation of Droplet Growth in Nozzle Condensation written by Richard Roberts (Sc. D.) and published by . This book was released on 1969 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and theoretical study has been made of the condensation of water vapor (with air carrier) in a supersonic nozzle in order to investigate the possible existence of condensate droplets which are substantially larger than predicted by the standard application of classical condensation theory. Droplet size was measured using light scattering techniques, which when combined with the total mass concentration of condensate, provided limits on the maximum and average droplet size. It was found that approximately one part in 10 of the droplet concentration reached a size a factor of 10 greater than predicted by the classical theory . . .The maximum droplet size, furthermore, was not seen to decrease proportionately as the nucleation zone was approached, indicating that the larger droplets are formed during the early stages of condensation. Inconclusive evidence suggests that this occurs following the completion of nucleation but before the vapor supply is exhausted. A calculation procedure which allowed the separation of the nuclei into a distribution of sizes, arising from a varying stability criterion and radius dependent growth rate, resulted in the establishment of a qualitatively correct distribution shape but no theoretical substantiation of an aging or coarsening mechanism. A separate application of Brownian coagulation theory to surface-averaged condensation theory resulted in the prediction that the average droplet size increased by a factor of between 2.5 and 4. No conclusion could be drawn concerning the actual existence of this size increase due to the level of uncertainty in the determination of average droplet size.
Book Synopsis Dynamics of Droplets by : Arnold Frohn
Download or read book Dynamics of Droplets written by Arnold Frohn and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with the dynamical behaviour of single droplets and regular droplet systems. It has been written mainly for experimental researchers. After a short description of the theoretical background, the different experimental facilities and methods necessary for the investigation of single droplets are described in detail. A summary of important applications is included.
Book Synopsis Rarefied Gas Dynamics by : Alfred E. Beylich
Download or read book Rarefied Gas Dynamics written by Alfred E. Beylich and published by . This book was released on 1991 with total page 1638 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the most recent international research in the field of rarefied gas dynamics (RGD). Unique in the depth and scope of its presentation, it considers progress made in the treatment of non-equilibrium phenomena in such fields as aerospace, vacuum technology, isotope separation and gas dynamic lasers. Due to the broad range of RGD applications, the volume will appeal to readers from numerous fields (e.g. physics, engineering, mathematics, chemistry).