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Download or read book Experimental Study and Numerical Simulation of Periodic Bubble Formation at Submerged Micron-sized Nozzles with Constant Gas Flow Rate written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. D. Zughbi
Publisher :
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (22 download)
Download or read book Numerical Simulation of Bubble Formation and Growth at a Submerged Orifice written by H. D. Zughbi and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Garald Raymond Hunt
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (986 download)
Download or read book An Experimental Study of Bubble Formation from a Submerged Nozzle written by Garald Raymond Hunt and published by . This book was released on 1982 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Walter I. Goldburg
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.3/5 (91 download)
Download or read book Experimental Study of the Method of Bubble Formation in Bubble Chambers written by Walter I. Goldburg and published by . This book was released on 1958 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ying Hang Tsang
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.E/5 ( download)
Download or read book Experimental Studies of Millimeter-sized Bubbles in an Electrolytic Solution written by Ying Hang Tsang and published by . This book was released on 2005 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bernard Bunner
Publisher :
ISBN 13 :
Total Pages : 544 pages
Book Rating : 4.3/5 (91 download)
Download or read book Numerical Simulation of Gas-liquid Bubbly Flows written by Bernard Bunner and published by . This book was released on 2000 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721080311
Total Pages : 158 pages
Book Rating : 4.0/5 (83 download)
Download or read book Bubble Generation in a Continuous Liquid Flow Under Reduced Gravity Conditions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-13 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work reports a study of bubble generation under reduced gravity conditions for both co-flow and cross-flow configurations. Experiments were performed aboard the DC-9 Reduced Gravity Aircraft at NASA Glenn Research Center, using an air-water system. Three different flow tube diameters were used: 1.27, 1.9, and 2.54 cm. Two different ratios of air injection nozzle to tube diameters were considered: 0.1 and 0.2. Gas and liquid volumetric flow rates were varied from 10 to 200 ml/s. It was experimentally observed that with increasing superficial liquid velocity, the bubbles generated decreased in size. The bubble diameter was shown to increase with increasing air injection nozzle diameters. As the tube diameter was increased, the size of the detached bubbles increased. Likewise, as the superficial liquid velocity was increased, the frequency of bubble formation increased and thus the time to detach forming bubbles decreased. Independent of the flow configuration (for either single nozzle or multiple nozzle gas injection), void fraction and hence flow regime transition can be controlled in a somewhat precise manner by solely varying the gas and liquid volumetric flow rates. On the other hand, it is observed that uniformity of bubble size can be controlled more accurately by using single nozzle gas injection than by using multiple port injection, since this latter system gives rise to unpredictable coalescence of adjacent bubbles. A theoretical model, based on an overall force balance, is employed to study single bubble generation in the dynamic and bubbly flow regime. Under conditions of reduced gravity, the gas momentum flux enhances bubble detachment; however, the surface tension forces at the nozzle tip inhibits bubble detachment. Liquid drag and inertia can act either as attaching or detaching force, depending on the relative velocity of the bubble with respect to the surrounding liquid. Predictions of the theoretical model compare well with performed expe
Author : Salvatore Cezar Pais
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (317 download)
Download or read book Bubble Generation in a Continuous Liquid Flow Under Reduced Gravity Conditions written by Salvatore Cezar Pais and published by . This book was released on 1999 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Deepak Saagar Kalaikadal
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.:/5 (818 download)
Download or read book A Parametric Investigation of Gas Bubble Growth and Pinch-off Dynamics from Capillary-tube Orifices in Liquid Pools written by Deepak Saagar Kalaikadal and published by . This book was released on 2012 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The air-bubble dynamics phenomena in adiabatic liquid pools has been studied so as to present a better understanding of the parameters which that govern the process of ebullience, bubble growth and departure from a submerged capillary-tube orifice. The orifice diameter is found to directly dictate the bubble departure diameter, and the pinch-off is controlled by a characteristic neck-length. To study the role of orifice size on the growth and departure of adiabatic single bubbles, experiments were performed with different diameter capillary tubes submerged in of distilled de-ionized water as well as some other viscous liquids. A correlation has been developed based on the experimental data of this study along with those reported by several others in the literature. The predictions of this correlation agree very well with measured data for water as well as several other more viscous liquids. It is also found that the bubble departure diameter is the same as the orifice diameter when the latter equals twice the capillary length. The phenomenon of bubble necking and departure was explored experimentally and through a scaling analysis. Experiments were performed with five different liquids (water, ethanol, ethylene glycol, propylene glycol, and glycerol) to extract the departure neck-lengths for isolated gas bubbles at pinch-off from the capillary orifice. A scaling analysis of the experimental data indicated that the bubble neck-length at departure or pinch-off was predicted by a balance of buoyancy, viscous and surface tension forces. These were established to be represented by the Galilei and Morton numbers, and a power-law type predictive correlation has been shown to be in excellent agreement with the available data over a wide range of liquid properties. To characterize and model the growth and departure of single bubbles in different liquid pools, a theoretical model has been established. The motion of the gas-liquid interface has been modeled as a scaled force balance involving buoyancy, gas-momentum, pressure, surface tension, inertia and drag. With one-dimensional scaling of these forces, the model captures the incipience, growth, necking and departure of a bubble as it emerges from the orifice. Here necking and pinch-off is modeled based on the newly developed neck-length correlation. The results are compared with experimental data and are found to be in excellent agreement for a range of liquids, orifice sizes and flow rates. The predictions highlight the variations in bubble equivalent diameters at departure with orifice sizes, flow rates and fluid properties, and they further reiterate the well-established two-regime theory of bubble growth. The latter involves (a) the constant volume regime, where the bubble volume remains near constant and relatively independent of flow rate, and (b) the growing bubble regime, where the size of the bubble increases proportionately with the gas flow rate. Finally, the complex nature of ebullience in aqueous surfactant solutions has been studied using the reagents FS-50, SDS, and CTAB. The influence of the modulated liquid surface tension or more specifically, the role of the time dependent dynamic surface tension on the formation and departure of adiabatic bubbles has been investigated. Comparative studies have been undertaken to investigate the effect of time-dependent surface tension relaxation in surfactant solutions as opposed to ebullience in pure liquids with the same equilibrium surface tensions. Results highlight the effects of the surfactant's molecular weight on the adsorption-desorption kinetics, and the consequent influence on ebullience. It has been established that the bubbling characteristics in surfactant solutions are, in the first order, governed by the dynamic surface tension of the solute-solvent system.
Author : Srinivas Gopalkrishna Rao
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (346 download)
Download or read book Experimental Study of Bubble Formation Mechanisms at an Angled Orifice written by Srinivas Gopalkrishna Rao and published by . This book was released on 1996 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Owen C. Jones
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (462 download)
Download or read book Adiabatic Formation of Gas Bubbles from Submerged Orifices written by Owen C. Jones and published by . This book was released on 1966 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The existence of droplets or bubbles occurs in many phases of practical engineering ... In order to design specific apparatus, a knowledge of the methods of controlling droplet and/or bubble size becomes important. It is for this reason that many investigators have made analytical and experimental studies of the basic problems of droplet and bubble formation. For purposes of this discussion, only bubble formation in liquid surroundings, will be considered in detail, although there is certainly an analogy in the formation of liquid droplets in gaseous surroundings." -- leaves 1-2.
Author : Alice P. Brooks
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (676 download)
Download or read book Fluid Mechanics of Bubble Capture by the Diving Bell Spider written by Alice P. Brooks and published by . This book was released on 2010 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The water spider, a unique member of its species, is used as inspiration for a bubble capture mechanism. Bubble mechanics are studied in the pursuit of a biomimetic solution for transporting air bubbles underwater. Careful experimentation is performed to understand the mechanics of bubble formation and capture. Investigation of bubble formation through an underwater nozzle shows that bubble volume increases by 15% when parallel rods are spaced above the nozzle at the same width as the inner diameter of the nozzle. Bubble volume decreases linearly with increasing air injection rate. Decreasing surface tension by approximately 40% decreases bubble volume by approximately 20%. Changing the angle the nozzle from parallel to perpendicular with the bottom of the tank increases bubble volume 40%. Based on trends observed in the nozzle experiments and using the spider's mechanisms for bubble capture as inspiration, a bubble capture device is manufactured. Decreasing the surface tension of the fluid by 25% decreases captured bubble volume by 50%. Below a device submersion speed of approximately 2.4 mm/s, bubble formation was at a maximum for the device, regardless of fluid surface tension. This research elucidates the limitations on bubble capture by the water spider. For future applications, these limitations can be pinpointed and adjusted for more efficient bubble capture and plastron maintenance.
Author : Anirudh M. Deodhar
Publisher :
ISBN 13 :
Total Pages : 91 pages
Book Rating : 4.:/5 (812 download)
Download or read book Computational Study of Adiabatic Bubble Growth Dynamics from Submerged Orifices in Aqueous Solutions of Surfactants written by Anirudh M. Deodhar and published by . This book was released on 2012 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth dynamics of isolated gas bubbles (inception -> growth -> departure) emanating from a capillary-tube orifice submerged in isothermal pools of aqueous solutions of surfactants is computationally investigated. The Navier-Stokes equations are solved in the liquid and the gas phase. The evolution of the gas-liquid interface is tracked using a Volume-of-Fluid (VOF) method. Surfactant molecules in aqueous solutions have a tendency to diffuse towards the gas-liquid interface and are subsequently adsorbed onto it. This time dependent adsorption process gives rise to the dynamic surface tension behavior of the aqueous surfactant solutions. To computationally model this behavior, the species conservation equation for the surfactant is solved in the bulk fluid and is coupled with the dynamic adsorption-desorption of the surfactant on the interface. A new form of the surfactant transport equation is derived that was necessary to incorporate the interfacial transport in the volume-of-fluid method where the interface is spread over multiple grid cells. Computational results were obtained for bubble growth dynamics from a capillary orifice in a pool of pure water and in an aqueous solution of Sodium Dodecyl Sulphate (SDS). The evolving bubble shape and the flow field in the two phases in the pure liquid and in surfactant solution are compared for a variety of air flow rates (from 4 ml/min to 24 ml/min) in the constant bubble regime. To validate the computational model, the results for the transient shape and size of growing bubbles in pure water were compared with available experimental data and were found to be in excellent agreement. Results show that the dynamic surface tension relaxation gives rise to smaller bubble size at departure in aqueous surfactant solution compared to that in pure water. However, this effect is found to be a function of the air flow rate. At high air flow rates (24 ml/min), the short time for bubble growth allows relatively smaller drop in the surface tension and produces departure diameters similar to bubble diameters in water. At low air flow rates (4 ml/min), the departure time is much larger and allows for complete surface tension relaxation. As such the departure diameters at low air flow rates in aqueous surfactant solution are significantly smaller than those predicted in pure water. Also, the flow patterns around a growing bubble in surfactant solution are altered due to the non-uniform surfactant adsorption along the gas-liquid interface. The computational results elucidate the role of surfactant transport on bubble growth dynamics.
Author : Abhijit Mukherjee
Publisher :
ISBN 13 :
Total Pages : 520 pages
Book Rating : 4.:/5 (554 download)
Download or read book Numerical and Experimental Study of Lateral Merger of Vapor Bubbles Formed on a Horizontal Surface During Nucleate Pool Boiling written by Abhijit Mukherjee and published by . This book was released on 2004 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (226 download)
Download or read book Theoretical Modeling and Correlational Analysis of Single Bubble Dynamics from Submerged Orifices in Liquid Pools written by and published by . This book was released on 2008 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth dynamics of a single gas bubble from inception to departure, emanating from a submerged capillary tube orifice in quiescent liquid pools has been theoretically modeled. The mathematical model represents a fundamental balance of forces due to buoyancy, viscosity, surface tension, liquid inertia, and gas momentum transport, and the consequent motion of the evolving gas-liquid interface. Theoretical solutions describe the dynamic bubble behavior (incipience, growth, necking and departure) as it grows from the tip of a capillary tube orifice in an isothermal pure liquid pool. Also complete Navier Stokes equations are solved using VOF model to simulate the different stages in the evolution of the bubble. Variations in bubble shapes and sizes, equivalent diameter, and growth times with capillary orifice diameter and air flow rates are outlined. These results are also found to be in excellent agreement with the experimental data available in the literature. The parametric trends suggest a two-regime ebullient transport: (a) a constant volume regime where the bubble diameter is not affected by the flow rate, and (b) a growing bubble regime where bubble size increases with flow rate. The experimental data available in the literature for a wide range of liquids, flow rates and orifice sizes are analyzed to develop regime maps that characterize these two regimes. For a given liquid, the transition from the constant volume regime and the growing bubble regime is determined by the non-dimensional parameter, BoFr0.5 = 1, that defines the interaction between buoyancy, surface tension and inertial forces. Correlation for isolated adiabatic bubble departure diameters is also developed based on a non-linear regression analysis of experimental data. The correlation considers the effects of thermo physical properties of the gas and liquid phases, orifice diameters and gas flow rates, and describes the experimental data published in the literature with in " 10 percent.
Author : Bahman Abbasi
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (298 download)
Download or read book Experimental and Computational Study of Droplet and Bubble Formation written by Bahman Abbasi and published by . This book was released on 2007 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ignace I. Kolodner
Publisher : Forgotten Books
ISBN 13 : 9781333422004
Total Pages : 96 pages
Book Rating : 4.4/5 (22 download)
Download or read book Underwater Explosion Bubbles IV written by Ignace I. Kolodner and published by Forgotten Books. This book was released on 2016-08-31 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Underwater Explosion Bubbles IV: Summary of Results and Numerical Computations Began in 1953 and was completed, except for various drawings, in 1955. While the organization of the work and the responsibility for. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
