Download or read book A Computational Study Of Non Newtonian Droplet Dynamics written by Kyle G. Mooney and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sprays are encountered regularly in many industrial and military applications including inkjets, cooling processes, evaporation processes, catalyzation, coatings, and propulsion chambers. Spray atomization phenomena of Newtonian fluids have received significant academic and industrial research attention, however, the effect of non-Newtonian rheologies on spray formation and downstream droplet behavior has not been as heavily investigated. The aim of this work is to elucidate the effect of non-Newtonian and viscoelastic rheological effects on droplet behavior in the context of secondary atomization and droplet collisions. This study utilizes finite volume computational fluid dynamics (CFD) to recreate droplet fluid physics in a numerical setting to a high accuracy. Droplet collision systems comprised of Newtonian, viscoelastic and shear-thinning rheologies are simulated using a Lagrangian moving-mesh interface tracking method (MMIT). This interface tracking approach provides increased surface curvature accuracy on relatively coarse meshes compared to many Eulerian multiphase methods. Modeling assumptions and interface mesh treatments are validated using existing analytical and experimental comparisons showing good agreement. Interpolation error due to cell deformation is minimized with local topological mesh adaptation and a global element quality optimization algorithm. The fully three dimensional computational study investigates the effect of these non-Newtonian and viscoelastic rheologies on a droplet collision. Here, simulated fluid ligaments exhibit increased stability with greater relative elasticity. By applying the similar simulation techniques to collisions of shear thinning droplets, a simple reduced order viscosity model has been produced, valid within a certain range of Weber number values. Another important atomization phenomenon, secondary breakup, is simulated using a volume of fluids (VOF) based interface capturing method applied to a centroid tracking moving mesh. Here, an axisymmetric CFD study of the wind induced break up of both Newtonian and non-Newtonian droplets is presented with comparisons with experimentally observed results. The numerical implementation is further verified by displaying accurate recreation of rapid micro-scale bubble collapse processes and subsequent jet ejection observed in controlled laboratory settings. The presented simulation results show capability in prediction of both the transient deformation morphology and the time scales in which droplet disintegration occurs.
Download or read book A Computational Study of Non Newtonian Flow written by Ala Fakhri Hussain Al-Hussany and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Droplet Dynamics on Chemically Striped Patterned Surfaces written by Hendrik Patrick Jansen and published by . This book was released on 2014 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods for Polymers written by Masoud Soroush and published by MDPI. This book was released on 2020-12-10 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in computational methods for polymers. It covers multiscale modeling of polymers, polymerization reactions, and polymerization processes as well as control, monitoring, and estimation methods applied to polymerization processes. It presents theoretical insights gained from multiscale modeling validated with exprimental measurements. The book consolidates new computational tools and methods developed by academic researchers in this area and presents them systematically. The book is useful for graduate students, researchers, and process engineers and managers.
Download or read book Numerical Simulation of Newtonian non Newtonian Multiphase Flows written by Ahmad Amani and published by . This book was released on 2019 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of a Liquid Droplet written by Prashant Khare and published by American Chemical Society. This book was released on 2024-04-09 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase flows and droplet dynamics play a vital role in the industry. Mineral ore (i.e., iron, aluminum, and copper mined in huge quantities yearly) must flow at some stage during extraction. Fluidized beds, bubbly flow in nuclear reactors, inkjet printing, gas-particle flows in chemical reactors, cavitating pumps and turbines, electrophotography used in copy machines, and laser and LED printers are a few examples of process technologies where multiphase flows play a vital role. The importance of multiphase flows concerning air pollution has recently been well recognized. In particular, in propulsion devices, such as automobiles and gas turbine engines in aircraft and power plants, the combustion of liquid fuels, such as diesel, gasoline, and Jet-A, is responsible for creating greenhouse gases and particulates (e.g., unburned carbon particles), which are identified as pollutants. The efficiency of the combustion process and, consequently, the production of the resulting pollutants are dictated by the breakup and vaporization of liquid fuels, making understanding these phenomena critical to developing efficient combustion devices. This ACS In Focus digital primer discusses the current understanding of the breakup and vaporization of single droplets in stagnant and convective environments. Its intended audience is an early career researcher (ranging from a second-year Ph.D. student to a postdoctoral fellow) interested in exploring the fascinating world of liquid droplets. The reader is expected to have had at least an advanced thermodynamics and fluid mechanics undergraduate course.
Download or read book Advances in Experimental and Computational Rheology Volume II written by Maria Teresa Cidade and published by MDPI. This book was released on 2020-11-27 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rheology, defined as the science of deformation and flow of matter, is a multidisciplinary scientific field, covering both fundamental and applied approaches. The study of rheology includes both experimental and computational methods, which are not mutually exclusive. Its practical importance embraces many processes, from daily life, like preparing mayonnaise or spreading an ointment or shampooing, to industrial processes like polymer processing and oil extraction, among several others. Practical applications include also formulations and product development. Following a successful first volume, we are now launching this second volume to continue to present the latest advances in the fields of experimental and computational rheology applied to the most diverse classes of materials (foods, cosmetics, pharmaceuticals, polymers and biopolymers, multiphasic systems, and composites) and processes.
Download or read book Computational Fluid Dynamics of Rising Droplets written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of this study is to perform simulations of droplet dynamics using Truchas, a LANL-developed computational fluid dynamics (CFD) software, and compare them to a computational study of Hysing et al.[IJNMF, 2009, 60:1259]. Understanding droplet dynamics is of fundamental importance in liquid-liquid extraction, a process used in the nuclear fuel cycle to separate various components. Simulations of a single droplet rising by buoyancy are conducted in two-dimensions. Multiple parametric studies are carried out to ensure the problem set-up is optimized. An Interface Smoothing Length (ISL) study and mesh resolution study are performed to verify convergence of the calculations. ISL is a parameter for the interface curvature calculation. Further, wall effects are investigated and checked against existing correlations. The ISL study found that the optimal ISL value is 2.5[Delta]x, with [Delta]x being the mesh cell spacing. The mesh resolution study found that the optimal mesh resolution is d/h=40, for d=drop diameter and h=[Delta]x. In order for wall effects on terminal velocity to be insignificant, a conservative wall width of 9d or a nonconservative wall width of 7d can be used. The percentage difference between Hysing et al.[IJNMF, 2009, 60:1259] and Truchas for the velocity profiles vary from 7.9% to 9.9%. The computed droplet velocity and interface profiles are found in agreement with the study. The CFD calculations are performed on multiple cores, using LANL's Institutional High Performance Computing.
Download or read book Process Spray written by Udo Fritsching and published by Springer. This book was released on 2016-08-01 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the latest research on producing functional particles using spray processes. The authors detail micro level elementary processes and phase boundaries, process analysis scaling and modeling, and macro level process functions and particle properties. They include numerical simulations and particulars of experiments for deriving process conditions for particle production.
Download or read book Dynamics of Droplets written by Arnold Frohn and published by Springer Science & Business Media. This book was released on 2000-03-27 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with the dynamical behaviour of single droplets and regular droplet systems. 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.
Download or read book Engineering Fluid Dynamics written by Bjørn H. Hjertager and published by MDPI. This book was released on 2018-04-06 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Engineering Fluid Dynamics" that was published in Energies
Download or read book Investigation Into Smoothed Particle Hydrodynamics for Non Newtonian Droplet Modelling written by Gavin Lobo and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Sprays and Spray Deposition written by Hani Henein and published by Springer. This book was released on 2017-07-22 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes and illustrates metal spray and spray deposition from the process engineering, metallurgical, and application viewpoints. The authors include step-by-step fundamental information for the metal spray process and detail current engineering developments and applications. They offer industry insight on non-equilibrium solidification processes for yielding stable metal structures and properties.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1986 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Studies for Extending Understanding of Complex Droplet Breakup Mechanisms written by Caroline Jean Anderson and published by . This book was released on 2021 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional methods of classifying droplet breakup are evaluated in the context of unique variation in environmental and droplet fluid conditions. Most characterization is developed for subsonic speeds and Newtonian fluids, so this study extends understanding on how these forms change to a span of applications outside these conditions. Presented examples include the impact effects on hypersonic vehicles travelling through precipitation, where even smallest of rain drops at such speeds can cause damage. Before the droplet even reaches the vehicle, it interacts with the detached bow shock that leads it. Another example of exceptional recent concern is risk of viral transmission by breakup function within human saliva in sneezes, coughs and speaking. Such biofluid behavior is complicated by viscous and elastic properties, subject to molecular composition that varies person to person by function of their age, gender, and medical conditions.
Download or read book Impact Dynamics of Newtonian and Non Newtonian Fluid Droplets on Super Hydrophobic Substrate written by Yingjie Li and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional rheological methods such as viscometry to characterize linear and nonlinear viscosity behavior requires an excessive amount of sample liquid, which is practically impractical due to the time and cost constraints, for instances, in blood, and other scarce and expensive bio-fluids. There is an urge for a handy tool to quickly evaluate the intrinsic properties of a liquid. In this thesis, droplet of Newtonian (e.g. water) and non-Newtonian liquids (e.g. shear thinning blood, shear thickening starch solution) with a desired dimension is released by a pipette from a vertical distance. Gravitational attraction gives rise to an impact velocity, and the droplet hits a rigid hydrophobic surface with a liquid-substrate contact angle of 150o. An experimental set up equipped with a manual pipette, high speed camera, and substrate holder etc. is constructed to capture the geometrical change over the sequential the impact-spread-recoil-rebound process. Upon impact, the droplet turns into an expanding pancake geometry with coronal spires developing over time. In extreme conditions of high impact velocity, splashing or fragmentation is observed. The video records are analyzed in terms of the classical dimensionless Weber number (We) which comprises impact velocity and surface tension. Other measurements are made: (i) duration of droplet on the substrate, and the change in contact area at droplet-substrate interface, prior to rebounce, (ii) critical droplet dimension and impact velocity leading to fragmentation, (iii) jet formation at rebounce, (iv) maximum number of spires, and (v) wavelength of radial Rayleigh wave. Comparison between Newtonian and non-Newtonian liquids are made, and non-linear behaviors are observed. Weber number is shown to be insufficient in describing spire formations. Non-linear viscosity, playing an indispensable role in droplet geometric deformation, must be incorporated in droplet dynamics.
Download or read book An Experimental and Computational Study of Bouncing and Deformation in Droplet Collision written by J. Qian and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
