Analytical and Experimental Investigation Into the Thermal Aspects of Droplet Impingement
Author : M. Quero
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Page : 262 pages
File Size : 33,13 MB
Release : 2006
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Author : M. Quero
Publisher :
Page : 262 pages
File Size : 33,13 MB
Release : 2006
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Author :
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Page : pages
File Size : 17,93 MB
Release : 2003
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The mechanics and heat transfer of droplet impact is studied in the range of parameters interest for Super-cooled Large Droplet icing. The investigation explores the development of the splash produced experimental and numerically. A Navier-Stokes solver has been developed in order to compare experiments and modelling. Heat transfer is included in the simulations making possible the analysis of the thermal history during the impact of a Super-cooled droplet into a warm and running thin water film. Also a theoretical and numerical study has been undertaken in order to simulate the first stages of ice formation on the critical surfaces of aircraft during the droplet impact under freezing conditions due to super-cooled icing. The parameters considered experimental and numerically are: " Droplet size: 100-700Jlm." Droplet impact velocity: 18-80m/s." Angles of impact: 70°,45° and 20°." Airflow (droplet) temperature: 200 e and _lOoe." Water film thicknesses: 150Jlm and 50Jlm." Water film temperature: 15°e and lOoe." Water film velocity: 5m/s. The simulations are compared to the experiments run under the same conditions. Results for the parameters at the early stages of the splash agree well but as the splash process continues there are more differences between the two sets of results.
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Page : pages
File Size : 30,36 MB
Release : 2018
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Abstract : The fuel spray wall interaction phenomenon plays an essential role in determining the emissions and performance of an internal combustion engine. The investigation of single droplet wall interaction is crucial to understanding of a spray wall impingement process. This report is a compilation of the experimental work done to understand the droplet impingement characteristics, through optical diagnostics and temperature measurement. Different fuels and different surface under ambient and elevated temperature conditions are used for these tests, with two objectives: Development of a common depositionsplashing criteria; and Understanding droplet post impingement dynamics variation with factors like: Weber number (ratio of inertia and surface tension forces), and with temperature. The droplet post impinging characteristics include spread factor, height ratio, contact line velocity and dynamic contact angle. The effect of Weber no on droplet impingement characteristics is investigated using water and diesel. The effect of temperature is divided into two subsections: Isothermal (cold wall-cold droplet and hot wall-hot droplet) and non-isothermal conditions (hot wall-cold droplet and hot droplet and cold wall), to understand the influence of both variation in thermophysical properties and heat transfer between droplet and surface. Using the experimental results, a comprehensive review of splashing criteria is done, along with a proposed new correlation for same and concept of splashing probability is introduced. The observation presented for variation in post-impingement characteristics with the mentioned factors are useful for future development of numerical codes.
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Page : 996 pages
File Size : 38,92 MB
Release : 1990
Category : Aeronautics
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Author : John W. Schaefer
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Page : 52 pages
File Size : 36,19 MB
Release : 1962
Category : Heat flux
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Author :
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Page : 400 pages
File Size : 20,77 MB
Release : 1948
Category : Mechanics, Applied
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Page : 620 pages
File Size : 45,74 MB
Release : 1945
Category : Aeronautics
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Author :
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Page : 384 pages
File Size : 23,19 MB
Release : 1979
Category : Aeronautics
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Author : United States. National Advisory Committee for Aeronautics
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Page : 568 pages
File Size : 14,4 MB
Release : 1951
Category : Aeronautics
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Author :
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Page : 654 pages
File Size : 33,15 MB
Release : 1992
Category : Aeronautics
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