Download or read book A Molecular Dynamics Investigation of Ice Nucleation Induced by Electric Fields written by Jingyi Yan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Surface Chemistry and Electric Fields on the Nucleation of Ice and Hydrates written by Katherine Patricia Carpenter and published by . This book was released on 2016 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding and controlling the formation of ice and hydrates has important energy-related applications including ice mitigation, methane harvesting from hydrates, and desalination by freezing. This dissertation describes multiple studies to explore the role of surface chemistry and electric fields on the nucleation of ice and hydrates. The first part of this dissertation describes a study on saltwater ice formation. A majority of the available literature on ice mitigation concerns freshwater icing, unlike this study. This work quantifies the influence of surface chemistry and texture on saltwater ice formation. Two kinds of experiments are conducted as part of this effort. The first set of experiments quantifies the influence of surface chemistry on ice nucleation of various saltwater solutions. It is noted that a large number of individual experiments were conducted, which makes the present results statistically meaningful, unlike most previous studies. The second set of experiments studies the dynamics associated with impact of saltwater droplets on supercooled superhydrophobic surfaces. It is seen that the saltwater droplets retract more than freshwater droplets (after impact). The greater bounciness of saltwater droplets is a result of slower ice nucleation propagation kinetics. These experiments indicate that superhydrophobic surfaces will offer greater resistance to impact icing with saltwater than pure water and can remain useful at temperatures as low as -40 °C. The second part of the dissertation includes a detailed study of electrofreezing, i.e., the electrically induced nucleation of ice from supercooled water. This work studies ice nucleation in electrowetted water droplets, wherein there is no electric field inside the droplet resting on a dielectric layer. Instead, there is an interfacial electric field and charge buildup at the solid-liquid interface. Through carefully planned experiments, the influence of electric fields and electric currents on the freezing temperature elevation is quantified. The results facilitate an in-depth understanding of various mechanisms underlying electrofreezing. Firstly, interfacial electric fields alone can significantly elevate freezing temperatures by more than 15 °C in the absence of current flow. Secondly, electrofreezing-induced temperature elevation saturates at high electric field strengths. Thirdly, the polarity of the interfacial charge does not significantly influence electrofreezing. Finally, current flow can further elevate the nucleation temperature by providing additional triggers for nucleation events. Overall, both the electric field and the electric current influence electrofreezing; however, the physical mechanisms are very different. The third part of the dissertation studies a novel concept to induce rapid formation of hydrates. The long induction times (hours to days) associated with hydrate nucleation is a significant barrier to many hydrate-based applications. The present work shows that electro-nucleation can promote rapid hydrate nucleation. Experiments were conducted with tetrahydrofuran (THF) hydrates, which is a model hydrate used in many studies as a precursor to studies with methane hydrates. The results show that hydrate nucleation can be triggered in less than ten minutes by applying electro-nucleation voltages. The voltage-induced current flow through the precursor solution leads to bubble generation on the electrodes. These bubbles act as nucleation sites and provide triggers to initiate rapid nucleation. Electro-nucleation is thus seen a powerful technique to induce rapid hydrate nucleation. In summary, the work conducted in this dissertation significantly advances our current understanding of nucleation and liquid-solid phase change. It also develops and characterizes new tools and concepts to stimulate and control nucleation. Therefore, in addition to the fundamental contributions in the field of phase change, this work can enable the development of new energy-relevant applications.
Download or read book Investigating Ice Nucleation at Negative Pressures Using Molecular Dynamics written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Atmospheric scientists and climate modelers are faced with uncertainty around the process of ice production in clouds. While significant progress has been made in predicting homogeneous and heterogeneous ice nucleation rates as a function of temperature, recent experiments have shown that ice nucleation rates can be enhanced without decreasing temperature, through various mechanical agitations. One hypothesis for these findings is that mechanisms of stretching water and thereby inducing negative pressure in the liquid could lead to an increase in freezing rate. To better understand the viability of this concept, the effect of negative pressure on ice nucleation rates needs to be explored. To that end, we have conducted molecular dynamics simulations of water at negative pressures. Homogeneous ice nucleation rates for the ML-mW and mW water models are evaluated at pressures ranging from atmospheric to -1000 atm, using Forward Flux Sampling and constant cooling simulations. We find that the density difference between ice and liquid water is central in determining the increase in nucleation rate with negative pressure. With these results, we analyze an equation that has been posed as a first order approximation to quantify how nucleation rate changes with negative pressure. The equation predicts the slope of lines of constant nucleation rate in temperature--pressure coordinates, shining a light on the importance of the water density anomaly in determining the slope. We conclude that this linear approximation works well for the mW and ML-mW water models and can be useful in making experimental predictions to advance the study of ice nucleation mechanisms.
Download or read book Molecular Dynamics Study of the Kinetics of Heterogeneous Ice Nucleation written by Chu Li and published by . This book was released on 2018 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Topics on Crystal Growth written by Sukarno Ferreira and published by BoD – Books on Demand. This book was released on 2013-02-20 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crystal growth is the key step of a great number of very important applications. The development of new devices and products, from the traditional microelectronic industry to pharmaceutical industry and many others, depends on crystallization processes. The objective of this book is not to cover all areas of crystal growth but just present, as specified in the title, important selected topics, as applied to organic and inorganic systems. All authors have been selected for being key researchers in their field of specialization, working in important universities and research labs around the world. The first section is mainly devoted to biological systems and covers topics like proteins, bone and ice crystallization. The second section brings some applications to inorganic systems and describes more general growth techniques like chemical vapor crystallization and electrodeposition. This book is mostly recommended for students working in the field of crystal growth and for scientists and engineers in the fields of crystalline materials, crystal engineering and the industrial applications of crystallization processes.
Download or read book Physics and Chemistry of Ice written by Werner F. Kuhs and published by Royal Society of Chemistry. This book was released on 2007 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics and Chemistry of Ice is an authoritative summary of state-of the-art research contributions from the world's leading scientists. A key selection of submissions from to the 11th International Conference on the Physics and Chemistry of Ice, 2006 are presented here with a foreword by Werner F. Kuhs. An invaluable resource, this book provides researchers and professionals with up-to-date coverage on a wide range of areas in ice science including: " Spectroscopic and diffraction studies " Molecular dynamics simulations " Studies of ice mechanics " Quantum mechanical ab initio calculations " Ice and hydrate crystal growth and inhibition studies " Bulk and surface properties of ice and gas hydrates " Snow physics and chemistry This insight into topical aspects of ice research is a key point of reference for physicists, chemists, galciologists, cryo-biologists and professionals working in the fields of ice and hydrogen bonding. The Editor Werner F. Kuhs is a Professor of Crystallography at the University of G÷ttingen, Germany and has a career spanning 25 years of research in the field of water ices and gas hydrates using diffraction methods, neutron and Raman spectroscopy, scanning electron microscopy, atomic force and molecular dynamics simulations. He was the Chair of the 11th International Conference on the Physics and Chemistry of Ice.
Download or read book Innovative Food Processing Technologies written by and published by Elsevier. This book was released on 2020-08-18 with total page 2482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Food process engineering, a branch of both food science and chemical engineering, has evolved over the years since its inception and still is a rapidly changing discipline. While traditionally the main objective of food process engineering was preservation and stabilization, the focus today has shifted to enhance health aspects, flavour and taste, nutrition, sustainable production, food security and also to ensure more diversity for the increasing demand of consumers. The food industry is becoming increasingly competitive and dynamic, and strives to develop high quality, freshly prepared food products. To achieve this objective, food manufacturers are today presented with a growing array of new technologies that have the potential to improve, or replace, conventional processing technologies, to deliver higher quality and better consumer targeted food products, which meet many, if not all, of the demands of the modern consumer. These new, or innovative, technologies are in various stages of development, including some still at the R&D stage, and others that have been commercialised as alternatives to conventional processing technologies. Food process engineering comprises a series of unit operations traditionally applied in the food industry. One major component of these operations relates to the application of heat, directly or indirectly, to provide foods free from pathogenic microorganisms, but also to enhance or intensify other processes, such as extraction, separation or modification of components. The last three decades have also witnessed the advent and adaptation of several operations, processes, and techniques aimed at producing high quality foods, with minimum alteration of sensory and nutritive properties. Some of these innovative technologies have significantly reduced the thermal component in food processing, offering alternative nonthermal methods. Food Processing Technologies: A Comprehensive Review, Three Volume Set covers the latest advances in innovative and nonthermal processing, such as high pressure, pulsed electric fields, radiofrequency, high intensity pulsed light, ultrasound, irradiation and new hurdle technology. Each section will have an introductory article covering the basic principles and applications of each technology, and in-depth articles covering the currently available equipment (and/or the current state of development), food quality and safety, application to various sectors, food laws and regulations, consumer acceptance, advancements and future scope. It will also contain case studies and examples to illustrate state-of-the-art applications. Each section will serve as an excellent reference to food industry professionals involved in the processing of a wide range of food categories, e.g., meat, seafood, beverage, dairy, eggs, fruits and vegetable products, spices, herbs among others.
Download or read book Emerging Technologies for Food Processing written by Da-Wen Sun and published by Elsevier. This book was released on 2014-08-14 with total page 653 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Emerging Technologies in Food Processing presents essential, authoritative, and complete literature and research data from the past ten years. It is a complete resource offering the latest technological innovations in food processing today, and includes vital information in research and development for the food processing industry. It covers the latest advances in non-thermal processing including high pressure, pulsed electric fields, radiofrequency, high intensity pulsed light, ultrasound, irradiation, and addresses the newest hurdles in technology where extensive research has been carried out. Provides an extensive list of research sources to further research development Presents current and thorough research results and critical reviews Includes the most recent technologies used for shelf life extension, bioprocessing simulation and optimization
Download or read book Ice Adhesion written by K. L. Mittal and published by John Wiley & Sons. This book was released on 2020-12-15 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book presents ways to mitigate the disastrous effects of snow/ice accumulation and discusses the mechanisms of new coatings deicing technologies. The strategies currently used to combat ice accumulation problems involve chemical, mechanical or electrical approaches. These are expensive and labor intensive, and the use of chemicals raises serious environmental concerns. The availability of truly icephobic surfaces or coatings will be a big boon in preventing the devastating effects of ice accumulation. Currently, there is tremendous interest in harnessing nanotechnology in rendering surfaces icephobic or in devising icephobic surface materials and coatings, and all signals indicate that such interest will continue unabated in the future. As the key issue regarding icephobic materials or coatings is their durability, much effort is being spent in developing surface materials or coatings which can be effective over a long period. With the tremendous activity in this arena, there is strong hope that in the not too distant future, durable surface materials or coatings will come to fruition. This book contains 20 chapters by subject matter experts and is divided into three parts— Part 1: Fundamentals of Ice Formation and Characterization; Part 2: Ice Adhesion and Its Measurement; and Part 3: Methods to Mitigate Ice Adhesion. The topics covered include: factors influencing the formation, adhesion and friction of ice; ice nucleation on solid surfaces; physics of ice nucleation and growth on a surface; condensation frosting; defrosting properties of structured surfaces; relationship between surface free energy and ice adhesion to surfaces; metrology of ice adhesion; test methods for quantifying ice adhesion strength to surfaces; interlaboratory studies of ice adhesion strength; mechanisms of surface icing and deicing technologies; icephobicities of superhydrophobic surfaces; anti-icing using microstructured surfaces; icephobic surfaces: features and challenges; bio-inspired anti-icing surface materials; durability of anti-icing coatings; durability of icephobic coatings; bio-inspired icephobic coatings; protection from ice accretion on aircraft; and numerical modeling and its application to inflight icing.
Download or read book Food Engineering Innovations Across the Food Supply Chain written by Pablo Juliano and published by Academic Press. This book was released on 2021-12-05 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Food Engineering Innovations Across the Food Supply Chain discusses the technology advances and innovations into industrial applications to improve supply chain sustainability and food security. The book captures the highlights of the 13th International Congress of Engineering ICEF13 under selected congress themes, including Sustainable Food Systems, Food Security, Advances in Food Process Engineering, Novel Food Processing Technologies, Food Process Systems Engineering and Modeling, among others. Edited by a team of distinguished researchers affiliated to CSIRO, this book is a valuable resource to all involved with the Food Industry and Academia. Feeding the world’s population with safe, nutritious and affordable foods across the globe using finite resources is a challenge. The population of the world is increasing. There are two opposed sub-populations: those who are more affluent and want to decrease their caloric intake, and those who are malnourished and require more caloric and nutritional intake. For sustainable growth, an increasingly integrated systems approach across the whole supply chain is required. Focuses on innovation across the food supply chain beyond the traditional food engineering discipline Brings the integration of on-farm with food factory operations, the inclusion of Industry 4.0 sensing technologies and Internet of Things (IoT) across the food chain to reduce food wastage, water and energy inputs Makes a full intersection into other science domains (operations research, informatics, agriculture and agronomy, machine learning, artificial intelligence and robotics, intelligent packaging, among others)
Download or read book Furthering Our Understanding of Heterogeneous Ice Nucleation with Molecular Simulation written by and published by . This book was released on 2014 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Laboratory Investigation of Ice Nucleation written by K. Hussain and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Ice written by Victor F. Petrenko and published by OUP Oxford. This book was released on 1999-08-19 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ice is one of the most abundant and environmentally important materials on Earth, and its unique and intriguing physical properties present fascinating areas of study for a wide variety of researchers. This book is about the physics of ice, by which is meant the properties of the material itself and the ways in which these properties are interpreted in terms of water molecules and crystalline structure. Although ice has a simple crystal structure its hydrogen bonding results in unique properties, which continue to be the subject of active research. In this book the physical principles underlying the properties of ice are carefully developed at a level aimed at pure and applied researchers in the field. Important topics like current understandings of the electrical, mechanical, and surface properties, and the occurrence of many different crystalline phases are developed in a coherent way for the first time. An extensive reference list and numerous illustrations add to the usefulness and readability of the text.
Download or read book A Molecular Dynamics Study of Ice Ih at Constant Volume written by Jeffrey Alan Kerr and published by . This book was released on 1984 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Furthering Our Understanding of Heterogeneous Ice Nucleation with Molecular Simulation written by Stephen James Cox and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Investigation of Ice Nucleation and Application to Atmospheric Clouds written by Adam J. Durant and published by . This book was released on 2006 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
