The Effect of Surfactants on Heat and Mass Transfer to Water Drops in Air PDF Download
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Author: P. A. Sadd
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: P. A. Sadd
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Wann-Sheng Huang
Publisher:
ISBN:
Category :
Languages : en
Pages : 620
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Author:
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ISBN:
Category : Heat
Languages : en
Pages : 628
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Author: Wang-Teng Tsai
Publisher:
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Category :
Languages : en
Pages : 88
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Author: United States. Office of Saline Water
Publisher:
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Category : Saline water conversion
Languages : en
Pages : 918
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Author: Stathis Efstathios E Michaelides
Publisher: World Scientific
ISBN: 9814478660
Category : Technology & Engineering
Languages : en
Pages : 425
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Book Description
The field of multiphase flows has grown by leaps and bounds in the last thirty years and is now regarded as a major discipline. Engineering applications, products and processes with particles, bubbles and drops have consistently grown in number and importance. An increasing number of conferences, scientific fora and archived journals are dedicated to the dissemination of information on flow, heat and mass transfer of fluids with particles, bubbles and drops. Numerical computations and “thought experiments” have supplemented most physical experiments and a great deal of the product design and testing processes. The literature on computational fluid dynamics with particles, bubbles and drops has grown at an exponential rate, giving rise to new results, theories and better understanding of the transport processes with particles, bubbles and drops. This book captures and summarizes all these advances in a unified, succinct and pedagogical way.
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Languages : en
Pages :
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Computational simulations of the spreading, recoil, and rebound/break up of liquid droplet on a horizontal surface were carried out with a finite volume method on a structured grid. A volume-of-fluid (VOF) technique was used to track the deforming liquid-air interface. Simulations were carried out for water and aqueous surfactant solution drops impacting on hydrophilic (glass) and hydrophobic (Teflon) surfaces in the range of Weber numbers between 20 ~ 80. The computational predictions were compared with high-speed visualization of isothermal droplet impact reported by Gatne (2006) to validate the numerical model. The computational scheme based on the VOF method was able to capture the dynamics of this droplet-surface interaction phenomenon observed in the experiments. The numerical treatment included the dynamic surface tension variation for surfactant solutions and different values for the advancing and receding contact angles, which resulted in accurate prediction of the drop impact-spreading-recoil behavior. The computational simulations show that the water droplets spread and then recoil sharply so as to form a vertical column, which breaks up and ejects secondary droplets on a teflon surface but on a glass surface they spread, recoil to a lesser extent and oscillate to rest without rebound. The decrease in surface tension at the liquid-air interface and change in the wetting characteristics of the liquid-solid interface facilitates larger initial spreading and weaker recoil of surfactant solution droplets compared to water drops. The solution of lower molecular weight (higher mobility) surfactant (SDS) showed a higher maximum and final spread with weaker recoil compared to the higher molecular weight (lower mobility) Triton X-100 surfactant. The heat transfer phenomena in droplet impact were studied for both cooling and heating of water and aqueous surfactant solution drops. The results indicated that the wettability of the substrate has the biggest impact on heat transfer. SDS solution droplets resulted in higher heat transfer compared to water droplets due to better wettability and less recoil exhibited by these droplets. Surfactant solutions containing higher concentrations showed higher heat transfer rates as they have lesser recoil which results in more contact surface area with the surface. This study shows that addition of surfactants to water profoundly changes the droplet impact dynamics and concomitant heat transfer and this provides a method to passively modify and control the droplet impact-spreading-recoil processes.
Author: Mihail-Dan Staicovici
Publisher: Springer Science & Business
ISBN: 3642546846
Category : Science
Languages : en
Pages : 532
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Book Description
This book introduces two of the most exciting heat pumping technologies, the coabsorbent and the thermal recovery (mechanical vapor) compression, characterized by a high potential in primary energy savings and environmental protection. New cycles with potential applications of nontruncated, truncated, hybrid truncated, and multi-effect coabsorbent types are introduced in this work. Thermal-to-work recovery compression (TWRC) is the first of two particular methods explored here, including how superheat is converted into work, which diminishes the compressor work input. In the second method, thermal-to-thermal recovery compression (TTRC), the superheat is converted into useful cooling and/or heating, and added to the cycle output effect via the coabsorbent technology. These and other methods of discharge gas superheat recovery are analyzed for single-, two-, three-, and multi-stage compression cooling and heating, ammonia and ammonia-water cycles, and the effectiveness results are given. The author presents absorption-related topics, including the divided-device method for mass and heat transfer analysis, and truncation as a unique method for a better source-task match. Along with advanced gax recovery, the first and second principles of COP and exergy calculation, the ideal point approaching (i.p.a.) effect and the two-point theory of mass and heat transfer, the book also addresses the new wording of the Laplace equation, the Marangoni effect true explanation, and the new mass and heat exchangers based on this effect. The work goes on to explore coabsorbent separate and combined cooling, heating, and power (CHP) production and advanced water-lithium bromide cycle air-conditioning, as well as analyzing high-efficiency ammonia-water heat-driven heating and industrial low-temperature cooling, in detail. Readers will learn how coabsorbent technology is based on classic absorption, but is more general. It is capable of offering effective solutions for all cooling and heating applications (industry, agriculture, district, household, etc.), provided that two supplying heat-sink sources with temperatures outdistanced by a minimum of 12-15oC are available. This book has clear and concise presentation and illustrates the theory and applications with diagrams, tables, and flowcharts.
Author: Alan Joseph Anthony
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 602
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
