Studying of the fluid's property adjustment and its application in metal foam industry

Ing. Shehab Hassan Attia

Doctoral thesis

Abstract:

The 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.

Abstract:

The 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.

Keywords

Metal Foam, Hierarchical materials, Ethanol Foam model, Digital Image processing

Language used: English

Date on which the thesis was submitted / produced: 4. 3. 2022

Thesis defence

• Supervisor: prof. Ing. Karel Fraňa, Ph.D.

Technical University of Liberec

Faculty of Mechanical Engineering

Doctoral programme / field:
Machines and Equipment / Machine and Equipment Design