Browsing by Author "Attia, Shehab Hassan"
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- ItemNumerical simulation of the filling process in the pressure bottleAttia, Shehab Hassan; Fraňa Karel, prof. Ing. Ph.D. : 55679; Bílek Martin, doc. Ing. Ph.D. Skolitel : 55358; Kořínek Tomáš, Ing. Konzultant : 65057; Dopita Martin, Ing. Konzultant2 : 65344Numerical flow simulations in pressure bottles during the filling process, determination and testing of the simulation approaches, detection of pressure and temperature distribution in the pressure bottle, investigation of the heat transfer generated by gas compression into the bottle material, validations of the pressure and temperature by the experimental results at the particular locations of the computational domain. the different materials of the bottle will be considered for a numerical investigation
- ItemStudying of the fluid's property adjustment and its application in metal foam industryAttia, Shehab Hassan; ; Fraňa Karel, prof. Ing. Ph.D. Skolitel : 55679The main aim of this study is to find criteria influencing the shapes of a gas bubbles rising in stagnant liquid experimentally to form foam. A testing facility with the high-speed camera was designed. The results obtained are presented in terms of dimensionless parameters i.e. Reynolds's, Morton's and Eötvös. Factors varied to test their dependency such as nozzle diameter (3 - 5 mm), rate of flow rate (15 and 130 l/h), viscosity, surface tension and density were changed in order to see their effect on the shape of the bubble, its velocity in the liquid, surface tension force, drag force and buoyancy force. In order to vary such parameters a water-ethanol mixture was used in the tank. Also the foam formed was examined using water ethanol mixture in predicting the Foam bubble behavior in multi-phase flow. The study compares the concept of formation of foam at the surface of the mixture with the procedure of producing aluminum foam by direct gas injection. Material properties such as kinematic viscosity, density and surface tension on the foaming process will be studied experimentally, while the foam bubble size will be studied by means of digital image processing.