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Author: Florian Carle Publisher: 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.
Author: Florian Carle Publisher: 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.
Author: David Brutin Publisher: 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
Author: Amirreza Golpaygan Publisher: ISBN: 9780494280256 Category : Languages : en Pages : 440
Book Description
Dynamics of a sessile droplet in channel flow is studied numerically. The numerical model uses one set of the governing equations combined with a volume tracking method on a fixed structured mesh to model the simultaneous movement of mass and momentum across cell boundaries. Surface tension is modeled as a body force acting on the fluid near the free surface. Two dimensional sessile droplet deformation and channel flow structures are discussed for both pinned and unpinned droplets. The effects of having a fixed contact line on the deformation and breakup of a droplet are investigated. A characteristic length is defined to compare droplet deformation due to changes in the surface tension, viscosity and density ratios. Among theses parameters, the surface tension is found to be the most important one in determining the mobility of the droplets. A breakup criterion is obtained in terms of droplet Reynolds and Capillary numbers. Next, dynamics of two spaced sessile droplets in a channel flow is investigated. Displacements of binary droplets in a channel flow are compared by studying changes in the location of the leading and trailing edges for each droplet at different droplet spacing. Deformation and displacement of leading and tailing droplets with the ones for a single droplet are presented. The thesis concludes with application of the model to study displacement of a three-dimensional droplet. Dynamics of channel flow at the presence of water droplet was investigated considering the effects of Reynolds Number, Capillary number, Bond number, droplet size, and the contact angle. Displacement was characterized based on the changes of the droplet height and the contact wetted area.
Author: Nikolai V. Churaev Publisher: Springer Science & Business Media ISBN: 1475766394 Category : Science Languages : en Pages : 452
Book Description
This monograph is devoted to long-range surface forces sig nificant far beyond a single monolayer and felt over tens or even hundreds of molecular layers adjacent to an interface. The transi tion from the concept of short-range effects that reigned earlier to the concept of long-range forces simultaneously signified the transition from a two-dimensional world to a three-dimensional one, incomparably richer in physicochemical phenomena. This transition took many years and evolved through many steps. It began with the Gouy-Chapman theory of diffuse ionic atmospheres, which together with London's theory of molecular forces was used as a basis for the development (beginning in 1937) of the DLVO theory of stability of lyophobic colloids. Further elaboration of the theory involved the introduction of new types of force, and a generalization (in 1954) to the case of interaction between unlike particles (hetero coagulation). This theory is fundamental in such large-scale prac tical problems as flotation, water treatment, dyeing, soil science, microbiology, and interaction between biological cells. This book is the first comprehensive monograph devoted to sur face forces. This fact makes it easier to attract the reader's interest; yet, the reader's demands become all the more difficult to satisfy completely. Indeed, the research that we review and analyze here covers about 50 years of work. Much data has been amassed, so that the main problem was a careful selection and an alysis.
Author: Reza Yaghoubi Emami Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
A Particle Image Velocimetry (PIV) study on the air flow over a sessile water droplet exposed to a boundary layer flow was done in a wind tunnel. Reynolds number based on free stream velocity and the height of the droplet was 600
Author: Grazia Lamanna Publisher: Springer Nature ISBN: 3030333388 Category : Technology & Engineering Languages : en Pages : 311
Book Description
This book provides a selection of contributions to the DIPSI workshop 2019 (Droplet Impact Phenomena & Spray Investigations) as well as recent progress of the Int. Research Training Group “DROPIT”.The DIPSI workshop, which is now at its thirteenth edition, represents an important opportunity to share recent knowledge on droplets and sprays in a variety of research fields and industrial applications. The research training group “DROPIT” is focused on droplet interaction technologies where microscopic effects influence strongly macroscopic behavior. This requires the inclusion of interface kinetics and/or a detailed analysis of surface microstructures. Normally, complicated technical processes cover the underlying basic mechanisms, and therefore, progress in the overall process modelling can hardly be gained. Therefore, DROPIT focuses on the underlying basic processes. This is done by investigating different spatial and/or temporal scales of the problems and by linking them through a multi-scale approach. In addition, multi-physics are required to understand e.g. problems for droplet-wall interactions, where porous structures are involved.
Author: Fazia Ali-Toudert Publisher: Springer Nature ISBN: 3031439341 Category : Science Languages : en Pages : 563
Book Description
This book covers advanced theories and methods in the field of heat and mass transfer, which are expected to improve thermal systems performance and energy efficiency. It reports on novel findings relating to a wide range of topics in industry, building, transportation and agriculture. Offering a good balance of fundamental and applied research, this book provides scientists, engineers and other professionals with a timely snapshot on advances in thermal science, renewable energies and sustainable energy technologies. It also offers a source of inspiration for future research and collaborations.
Author: Hannah Fry Publisher: Lulu.com ISBN: 1291074317 Category : Science Languages : en Pages : 207
Book Description
In both engineering and medical applications it is often useful to use the knowledge of the conditions under which adhering liquid droplets appear, deform and interact with surrounding fluids, in order to either remove or create them. Examples include the de-wetting of aircraft surfaces and the process of injecting glue into the bloodstream in the treatment of aneurysms. In this study, we look at various methods of modelling a particular class of droplets - those attached to a wall in the presence of an external shear flow.
Author: Hiroyuki Kitahata Publisher: Elsevier Inc. Chapters ISBN: 0128061588 Category : Medical Languages : en Pages : 50
Book Description
In this chapter, we consider the motion of a droplet and the surrounding flow accompanied by the motion. Our specific attention is on the spontaneous and autonomous motion of a droplet. Such a system has no applied external force and no asymmetry imposed a priori. Nevertheless, the droplet moves by consuming energy and by breaking the symmetry of the system. The phenomenon reminds us of biological systems that can also move spontaneously. These systems, which are called self-propulsive systems, have recently been extensively studied after several model experiments were proposed using chemical reactions. The mechanism of such motion is less clear, though theoretical and computational studies have revealed several novel aspects of the motion in contrast with the motion under a given asymmetry. We discuss recently developed experimental systems. Then, we focus on a suspended droplet that swims, and explain how the result can be analyzed in terms of hydrodynamics by using the concept of surface tension. Finally, we apply the method to the analysis of a swimming suspended droplet induced propelled by a chemical pattern generated inside the droplet.
Author: Florian Carle
Author: Florian Carle
Author: David Brutin
Author: Amirreza Golpaygan
Author: Nikolai V. Churaev
Author: Reza Yaghoubi Emami
Author: Grazia Lamanna
Author: Fazia Ali-Toudert
Author: Hannah Fry
Author: Hiroyuki Kitahata
Author: Khaled Zamel Al-Sulaim