Experimental Investigation of a Single Droplet Evaporation of R-114 in Water PDF Download
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Author: Nagarajan Sangameshwaran
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Book Description
Author: Nagarajan Sangameshwaran
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Book Description
Author: G. B. Petrazhitskiĭ
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 28
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Book Description
Author: Crystal Buchanan Dale
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 322
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Book Description
Author: Sahar Andalib
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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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.
Author: Courtney Leigh Herring Bonuccelli
Publisher:
ISBN:
Category : Evaporation
Languages : en
Pages : 181
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Book Description
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 876
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Author: Harold Joseph Brikowski
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Author: Pyung Syk Ro
Publisher:
ISBN:
Category : Evaporation
Languages : en
Pages : 68
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Book Description
Author: Luis Augusto Ferraz Albani
Publisher:
ISBN:
Category : Evaporation (Meteorology)
Languages : en
Pages : 189
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Book Description
A combined numerical-experimental investigation was performed to study the influence of infrared radiation on the evaporation of a single-component droplet in the range between 10 and 50 micrometers, under different environmental conditions of relative humidity and temperature of air. A numerical model that predicts the evolution of the droplet size with respect to time was developed under the assumptions of steady state evaporation, spherical symmetry, no relative velocity between the droplet and the surroundings, constant material properties, and no temperature gradient inside the droplet. Numerical simulations were generated to obtain plots of droplet diameter with respect to time for droplets with an initial diameter of 50 micrometers under four different conditions of relative humidity (i.e., 0%, 30%, 60%, and 90%), two different air temperatures (i.e., 20 °C and 60 °C), and various radiation intensities (i.e., 0 to 10000 milliwatts per millimeters squared). Experiments were performed using an opto-mechanical rig capable of generating a monodispersed vertical chain of droplets inside a glass flow tube with various conditions of relative humidity and air temperature, in which the size of the droplets was measured using shadowgraphy. The droplet images were collected and processed using a 12X microscopic optical system and commercial software, respectively. An infrared laser beam with a wavelength of 2.8 micrometers was generated and aligned with the vertical droplet chain in order to provide the system with high amounts of infrared radiation at a wavelength in which the liquid water has a high absorptivity. The experimental and numerical results showed good agreement in all cases. It was determined that at elevated magnitudes of incident infrared radiation the evaporation rate of water droplets increases substantially and high amount of vapor content in the surrounding air becomes inconsequential.
Author: Zhiyu Han
Publisher: SAE International
ISBN: 1468604007
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
Simulation and Optimization of Internal Combustion Engines provides the fundamentals and up-to-date progress in multidimensional simulation and optimization of internal combustion engines. While it is impossible to include all the models in a single book, this book intends to introduce the pioneer and/or the often-used models and the physics behind them providing readers with ready-to-use knowledge. Key issues, useful modeling methodology and techniques, as well as instructive results, are discussed through examples. Readers will understand the fundamentals of these examples and be inspired to explore new ideas and means for better solutions in their studies and work. Topics include combustion basis of IC engines, mathematical descriptions of reactive flow with sprays, engine in-cylinder turbulence, fuel sprays, combustions and pollutant emissions, optimization of direct-injection gasoline engines, and optimization of diesel and alternative fuel engines.
