Inverse leidenfrost drop manipulation using menisci - Soft.
The Leidenfrost pump design consists of a closed-channel with ratcheted sidewalls to propel the liquid. A key feature of the closed channel pump is a proposed concept for vapor removal. The vapor is extracted from the liquid channel to the surrounding atmosphere through separate variable-depth channels. The Marangoni pump design consists of an open-channel with a ratcheted bottom channel wall.
Drop impact on hot plates: contact times, lift-off and the.
This report presents a study on the Leidenfrost point and film boiling of single droplets and sprays. The first portion of the work includes fundamental studies of impinging droplet fluid and heat transfer characteristics presented in the form of droplet impact behavior regime maps.
Influence of pressure on Leidenfrost effect - TUprints.
In this thesis, the Leidenfrost drop has been introduced as a water-based green chemical reactor for simultaneous synthesis and self-organization of nanostructures. An important contribution of this work is in exploring the origin and mechanism of the nanofabrication at Leidenfrost condition.
Electrostatic control and enhancement of film boiling heat.
Here, we study this reflection in detail, and show that frictionless Leidenfrost drops are a simple and efficient tool to probe the shape of an unknown interface. We then use the menisci to control the motion of the otherwise elusive drops. We create waveguides to direct and accelerate them and use parabolic walls to reflect and focus them.
Engineering an empire persia essay writing.
Abstract: The Leidenfrost effect influences substantially the contact of a liquid droplet with a hot surface. Contact between the liquid and solid is crucial for cooling applications such as fire-fighting, hot-mill steel rolling, thermal power plants and microprocessor cooling.
Numerical Modeling and Investigation of Boiling Phenomena.
This dissertation is divided into five main studies, which analyze different aspects of electrostatic suppression of the Leidenfrost state. The first part of this dissertation (Chapter 2) describes droplet-based experimental investigations on electrostatic suppression of the Leidenfrost state. It is demonstrated that the Leidenfrost state can be suppressed and surface dryout can be prevented.
Kei Takashina — the University of Bath's research portal.
For instance, it can occur for a Leidenfrost droplet; a water drop levitating above a hot plate whose temperature is much higher than the boiling temperature. In this case, boiling occurs in the film of saturated vapor which is entrapped between the bottom of the drop and the plate, whereas the top of the water droplet evaporates in contact of ambient air. The situation can also be ambiguous.
Leidenfrost e ect - University of Ljubljana.
Jumping Leidenfrost droplets Master Thesis Author: Mehri Baktash Main Supervisor: Prof. Heiner Linke Co-supervisor: Cassandra Niman Division of Solid State Physics Department of Physics 2012. Abstract A leidenfrost droplet forms when a liquid droplet is placed on a very hot surface. In the case that there is a thin layer of insulating material as a step on the substrate, under speci c.
ESA - Meet the teams: Spin-Leidenfrost.
The U.S. Department of Energy's Office of Scientific and Technical Information.
Splashing of Leidenfrost druplets - University of Twente.
The subject of the present thesis is the numerical modeling and investigation of boiling phenomena. The heat transfer during boiling is highly efficient and therefore used for many applications in power generation, process engineering and cooling of high performance electronics. The precise knowledge of particular boiling processes, their relevant parameters and limitations is of utmost.
Self-Propelled Jumping upon Coalescence on Leidenfrost.
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Fabrication and manipulation of non wetting surfaces and.
In this thesis, the Leidenfrost drop has been introduced as a water-based green chemical reactor for simultaneous synthesis and self-organization of nanostructures. An important contribution of this work is in exploring the origin and mechanism of the nanofabrication at Leidenfrost condition. It turns out that these conditions are based upon overheated and charged nature of the droplet.