Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Evaporation Dynamics of a Sessile Droplet on Glass Surfaces with Fluoropolymer Coatings: Focusing on the Final Stage of Thin Droplet Evaporation
Author: Embedded Cooling Of Electronic Devices: Conduction, Evaporation, And Single- And Two-phase Convection
Author: Madhusudan IyengarPublisher: World Scientific
ISBN: 9811279381
Category : Technology & Engineering
Languages : en
Pages : 479
Book Description
This book is a comprehensive guide on emerging cooling technologies for processors in microelectronics. It covers various topics such as chip-embedded two-phase cooling, monolithic microfluidic cooling, numerical modeling, and advances in materials engineering for conduction-limited direct contact cooling, with a goal to remedy high heat flux issues.The book also discusses the co-design of thermal and electromagnetic properties for the development of light and ultra-high efficiency electric motors. It provides an in-depth analysis of the scaling limits, challenges, and opportunities in embedded cooling, including high power RF amplifiers and self-emissive and liquid crystal displays. Its analysis of emerging cooling technologies provides a roadmap for the future of cooling technology in microelectronics.This book is a good starting point for the electrical and thermal engineers, as well as MS and PhD students, interested in understanding and collaboratively tackling the complex and multidisciplinary field of microelectronics device (embedded) cooling. A basic knowledge of heat conduction and convection is required.
Droplet Evaporation Dynamics on Surfaces
Author: Ahmet Alperen GunayDroplet Wetting and Evaporation
Author: David BrutinPublisher: Academic Press
ISBN: 0128008083
Category : Science
Languages : en
Pages : 464
Book Description
Droplet Wetting and Evaporation provides engineers, students, and researchers with the first comprehensive guide to the theory and applications of droplet wetting and evaporation. Beginning with a relevant theoretical background, the book moves on to consider specific aspects, including heat transfer, flow instabilities, and the drying of complex fluid droplets. Each chapter covers the principles of the subject, addressing corresponding practical issues and problems. The text is ideal for a broad range of domains, from aerospace and materials, to biomedical applications, comprehensively relaying the challenges and approaches from the different communities leading the way in droplet research and development. Provides a broad, cross-subject coverage of theory and application that is ideal for engineers, students and researchers who need to follow all major developments in this interdisciplinary field Includes comprehensive discussions of heat transfer, flow instabilities, and the drying of complex fluid droplets Begins with an accessible summary of fundamental theory before moving on to specific areas such as heat transfer, flow instabilities, and the drying of complex fluid droplets
Flow Motion in Sessile Droplets
Author: Florian CarlePublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Sessile droplets are widely found in day to day life: it might be a coffee spilt, rain onto a waterproof raincoat or again, water falling onto a cooking plate. However, despite the vast number of studies devoted to droplets for almost half a century, the fundamental phenomenon of the evaporation of sessile droplets is still a field that attracts a high level of interest due to its wide applicability and the development of new visualisation techniques or new types of complex fluids. This experimental study is focused two distinct aspects:- The evaporation of pure fluids has allow to study hydrothermal waves that appear in the droplets of volatile fluids during phase change. The influence of the type of fluid --different alcohols and alkanes-- and the gravity levels --Terrestrial, Lunar and Martian-- is investigated to have a better understanding of the flow motion inside droplet. Moreover, the use of different gravity levels allows to experimentally evidence the contribution of the atmospheric convective transport to sessile droplet evaporation. This investigation has allowed to develop an empirical model to take account of natural convection which greatly increases the evaporation rate in the quasi-steady diffusion-controlled evaporation model.- If complex fluids exhibit an evaporation dynamic similar to pure fluid, other mechanisms come into play, such as gelation, particles organisation and cracks formation. Wetting and different functional groups on the particles graphs will be studied in relation to the final pattern of cracks.
Evaporation and Droplet Growth in Gaseous Media
Author: N.A. FuchsPublisher: 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.
Dynamics of Sessile Droplet Evaporation in Laminar Convective Environments
Author: Omar Jameel Abdulrazzaq Al-RawiPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Drying Dynamics of Sessile Droplets on Substrates of Different Wettabilities
Author: Lanhe ZhangPublisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 168
Book Description
In the current study, the objectives are to understand the detailed evaporation mechanisms on surfaces of various hydrophobicities and how surface chemical heterogeneity, together with surface physical roughness can dictate the overall deposit patterns of sessile droplets. The dynamics of the three-phase contact line of sessile droplets containing poly(vinyl alcohol) adsorbed gold nanoparticles is experimentally investigated on three silica substrates - silicon wafer, quartz, and glass - with different surface roughness and chemistry. Substrate and particle surface chemistry modulate surface-particle and particle-particle interactions and affect how particles pack relative to their nearest neighbors. In addition, it was found that substrate surface chemistry and roughness play significant roles in controlling the extent of contact line pinning and affecting particle distribution in a deposit. Our hypothesis that the total intrinsic energy barrier for contact line pinning consisting of three components, U_pr, U_ch and U_(p-s), created by substrate physical roughness, chemical heterogeneity and particle-substrate interactions, respectively, has been tested successfully based on experimental observations. This extension of preexisting theory can be used as a guide to analyze more complicated systems and predict the behavior of an evaporating droplet on a solid substrate.
Experimental Investigation and Data-Driven Analysis of Binary and Multi-Component Droplet Evaporation
Author: Sahar AndalibPublisher:
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.
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