A Numerical Study of Droplet-Vortex Interactions in an Evaporating Spray
A Numerical Study of Droplet-Vortex Interactions in an Evaporating Spray

Author:

Publisher:

Published: 1994

Total Pages: 10

ISBN-13:

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In this paper, we present the time-dependent axisymmetric numerical simulation of an unsteady n-heptane evaporating spray, and investigate the droplet-vortex interactions which determine the structural and dynamic characteristics of a spray jet flow. The spray is formed between a droplet-laden heated nitrogen jet and a coflowing air stream. A detailed, multidimensional, two-phase algorithm is developed for the simulation. A comprehensive vaporization model is employed to calculate the instantaneous droplet size and surface temperature along the trajectory of each droplet group. Monodisperse spray in introduced into the large vortex structures that are generated due to the presence of buoyancy-induced hydrodynamic instability of the heated jet. Results focused on the two-way interactions between vortical structures and droplets, and the dynamics of both non-evaporating and evaporating sprays. The vortex structures cause droplets to disperse radially outward, and this in turn determines the fuel vapor distribution and also modifies the vortex dynamics. Thus, the dynamics and structural characteristics of the evaporating spray are strongly influenced by the two-way transient interactions. The effects of initial droplet size, injection location, and liquid-to-gas mass loading ratio on these interactions are also investigated.

Chemical Kinetics in Combustion and Reactive Flows: Modeling Tools and Applications
Chemical Kinetics in Combustion and Reactive Flows: Modeling Tools and Applications

Author: V. I. Naoumov

Publisher: Cambridge University Press

Published: 2019-08-22

Total Pages: 449

ISBN-13: 1108427049

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Introduces advanced mathematical tools for the modeling, simulation, and analysis of chemical non-equilibrium phenomena in combustion and flows, following a detailed explanation of the basics of thermodynamics and chemical kinetics of reactive mixtures. Researchers, practitioners, lecturers, and graduate students will find this work valuable.

Numerical Study of Droplet Evaporation
Numerical Study of Droplet Evaporation

Author: Ritul Gandhi

Publisher:

Published: 2017

Total Pages: 53

ISBN-13:

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Droplet evaporation plays a vital role in various engineering fields such as air/fuel premixing, inkjet printing and many more. The high rate of power dissipation from the integrated circuits and chips of electronic devices creates a need for cooling it to achieve their optimal functionality. The high rate of cooling can be achieved by thin film evaporation of water by phase change as compared to the air cooling methods. Therefore, the study of droplet evaporation is necessary to understand the underlying physics and effects of different parameters on cooling performance. Numerical study of droplet evaporation has been done by using the level set and arbitrary Lagrangian-Eulerian moving mesh method in COMSOL. These methods are used to track the shrinking liquid-gas interface because of phase change. The changes in the surface tension due to temperature gradient caused by the phase change induces Marangoni convection which influences evaporation. Investigation of the transient droplet evaporation is done wherein the radius of the droplet is pinned and the effect of Marangoni convection on the average droplet temperature is studied for the pure diffusion case. The model developed in this study can easily be extended to study contact line dynamics during droplet evaporation.

Multiphase Flow Handbook, Second Edition
Multiphase Flow Handbook, Second Edition

Author: Efstathios Michaelides

Publisher: CRC Press

Published: 2016-10-26

Total Pages: 1559

ISBN-13: 1315354624

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The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.

Mass Transfer
Mass Transfer

Author: Koichi Asano

Publisher: John Wiley & Sons

Published: 2007-09-24

Total Pages: 290

ISBN-13: 3527609083

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This didactic approach to the principles and modeling of mass transfer as it is needed in modern industrial processes is unique in combining a step-by-step introduction to all important fundamentals with the most recent applications. Based upon the renowned author's successful new modeling method as used for the O-18 process, the exemplary exercises included in the text are fact-proven, taken directly from existing chemical plants. Fascinating reading for chemists, graduate students, chemical and process engineers, as well as thermodynamics physicists.