Theoretical and Experimental Investigations of the Evaporation of Stationary Droplets and Sprays in High Temperature Surroundings PDF Download
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Author: Terrence William Hoffman Publisher: ISBN: Category : Languages : en Pages :
Book Description
"The past two decades have seen the advent of a number of new chemical engineering techniques for the processing of finely-divided solids or liquids. These are in effect contacting techniques, since the solid particles or liquid droplets are invariably dispersed in a continuous gas or vapor phase. Because of the very large surface areas available for heat and mass transfer, which is usually accompanied by reduced internal diffusional resistance, they provide faster rates of treatment - whether evaporation, drying or chemical reaction - than more conventional methods, while generally permitting better control over the operating conditions. They differ from one another in their flow patterns and modes of heat transfer." --
Author: Terrence William Hoffman Publisher: ISBN: Category : Languages : en Pages :
Book Description
"The past two decades have seen the advent of a number of new chemical engineering techniques for the processing of finely-divided solids or liquids. These are in effect contacting techniques, since the solid particles or liquid droplets are invariably dispersed in a continuous gas or vapor phase. Because of the very large surface areas available for heat and mass transfer, which is usually accompanied by reduced internal diffusional resistance, they provide faster rates of treatment - whether evaporation, drying or chemical reaction - than more conventional methods, while generally permitting better control over the operating conditions. They differ from one another in their flow patterns and modes of heat transfer." --
Author: N.A. Fuchs Publisher: Elsevier ISBN: 1483225631 Category : Science Languages : en Pages : 81
Book Description
Evaporation and Droplet Growth in Gaseous Media deals with the evaporation of droplets of liquid in gaseous media and the reverse process of droplet growth in a medium supersaturated with the vapor of the liquid. Thediscussion is restricted to the kinetics of evaporation and growth of droplets of pure liquids (and heat transfer to the same). Comprised of three chapters, this book first examines the quasi-stationary evaporation and growth of droplets that are motionless relative to the medium and the hydrodynamic factor is absent. The Maxwell equation, the basis of the theory of evaporation of droplets in a gaseous medium, is taken into account. The influence of the Stefan flow and the concentration change at the surface on the rate of evaporation are considered, along with the evaporation of droplets in a vessel with absorbing walls and the fall in temperature of both free evaporating droplets and supported evaporating droplets. The second chapter is devoted to the quasi-stationary evaporation of droplets in a stream of gas, that is, droplets moving relative to the medium. The last chapter focuses on non-stationary evaporation and growth of droplets that either motionless or moving relative to the medium. This monograph will be of interest to students, practitioners, and researchers in inorganic and structural chemistry.
Author: Sergei S. Sazhin Publisher: Springer Nature ISBN: 3030997464 Category : Technology & Engineering Languages : en Pages : 603
Book Description
This book acts as a guide to simple models that describe some of the complex fluid dynamics, heat/mass transfer and combustion processes in droplets and sprays. Attention is focused mainly on the use of classical hydrodynamics, and a combination of kinetic and hydrodynamic models, to analyse the heating and evaporation of mono- and multi-component droplets. The models were developed for cases when small and large numbers of components are present in droplets. Some of these models are used for the prediction of time to puffing/micro-explosion of composite water/fuel droplets — processes that are widely used in combustion devices to stimulate disintegration of relatively large droplets into smaller ones. The predictions of numerical codes based on these models are validated against experimental results where possible. In most of the models, droplets are assumed to be spherical; some preliminary results of the generalisation of these models to the case of non-spherical droplets, approximating them as spheroids, are presented.
Author: Sahar Andalib Publisher: ISBN: Category : Languages : en Pages : 146
Book Description
Sessile droplet evaporation is an omnipresent phenomenon both in nature and technologies such as biodiagnostics, microfabrication, inkjet printing, spray cooling, and agriculture irrigation. Evolution of single component sessile droplets has been extensively studied under various parameters. However, in real applications, sessile droplets usually consist of two or more components. It has been shown that the environmental conditions such as humidity and temperature substantially change the behavior of sessile droplets. The strong tendency of organic fluids to absorb water is an important factor in evaporation of these fluids in humid environment. The water vapor present in the surrounding adsorbs/absorbs and possibly condenses into the droplet transforming the droplet into a binary system. While the humidity of surrounding is typically an imposed condition resulting in unwanted effects for many industries, we have proposed that these undesired effects can be controlled and eliminated by tuning the temperature of the substrate. We have studied the combined effect of relative humidity of surrounding and substrate temperature on evaporation of methanol droplets. Our results demonstrated that the diffusion of water into the droplet can be limited by changing temperature of the substrate by both shortening the lifetime of droplet or increasing the temperature of the liquid-gas interface above the due point. Additionally, we have developed machine learning, classification and regression, models to analyze the behavior of droplet under different conditions. We have shown that the regime of droplet evaporation can be accurately classified by analyzing the profile of the evolution of droplet macroscopic parameters. We have also demonstrated that the humidity of surrounding can be accurately estimated by analysis of droplet profile. Furthermore, the time evolution of diameter and contact angle are estimated by the regression model. As the number of components in the droplet increases, the underlying mechanisms become more complex. The proposed approach to analyze the dynamics of sessile droplet evaporation through data-driven techniques opens up ways to better understand the complicated physics behind multi-component droplet evaporation and in general intricate interfacial fluid mechanics problems. The combined effect of surrounding humidity and substrate temperature has been experimentally studied on the behavior of ternary droplet consisting of methanol, anise oil, and water. The simultaneous optical microscopy and infrared thermography revealed different mechanisms in the droplet such as hydrothermal waves, oil microdroplet nucleation, etc. Our results showed three stages in the evolution of hydrothermal waves during droplet lifetime. The experimental procedures and results in this work introduce easy and inexpensive method to control sessile droplet behavior which are crucial for the final product resolution in numerous applications.
Author: Terrence William Hoffman
Author: Terrence William Hoffman
Author: Courtney Leigh Herring Bonuccelli
Author: United States. National Aeronautics and Space Administration
Author: Edward Yun Ho Keng
Author: N.A. Fuchs
Author: R. T. Alleman
Author: 
Author: Sergei S. Sazhin
Author: 
Author: Sahar Andalib