الفهرس 
CHAPTER (1) INTRODUCTION AND LITERATUREOnly 14 pages are availabe for public view
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Abstract
Two-phase flows have significant importance in many industrial applications. Some of these include boiling heat transfer, cloud cavitations in hydraulic systems, stirring of reactors, aeration in water purification, cooling devices of nuclear reactors and electrochemical reactions. Among others, bubbly flow has a great importance in the electrochemical reaction and particularly in hydrogen production, chlorate process, electroplating and metal purification processes. The presence of gas phase in the liquid phase makes the problem of two-phase flow, which is the knowledge available from heat transfer and fluid mechanics aspects, very complicated to be numerically solved.
The main objective of the present study is to numerically and experimentally investigate hydrogen evolution process in an electrolysis process from the point of view of two-phase flow characteristics. A reliable numerical procedure of bubbly two-phase flow simulations is built up based on the control volume formulation. The adopted mathematical model is based on the two-fluid Eulerian-Eulerian model, in which both liquid and gas phases are considered as separate fluids. The transport equations are solved for
both phases with allowance of interfacial transfer of mass and momentum. The conservation equations are discretized using finite volume method and solved based on the SIMPLE algorithm. On the other hand, a procedure of measurements handling the hydrogen generation process is carried out in the advanced fluid mechanics laboratory. In the present Ph.D. thesis, an approach for the numerical modeling of bubbly two-phase flow combined with ion transport in electrochemical process will be discussed. On order to verify the present developed computations with available experimental results from literature as well as the performed measurements handling the hydrogen generation process are introduced to show the quality of the present simulations. It is concluded that, the present developed numerical code plays an important role to predict the hydrogen production process, one of the important Investigation of two-phase flow for hydrogen evolution process
ii new fuel that will save our environment against pollution generated from the known fuels.
The results also show that the best production process is reached with decreasing the main flow velocity. Decreasing the distance between cathode and anode used in the electrochemical cell and increasing the current density help in improving the process of hydrogen production.