Investigation of pulsating flow’s ejector

Andrius Styra

Doctoral dissertation

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The dissertation deals with a newly developed pulsating flow ejector that can be used to remove iron compounds from water. The main object of the research is a newly developed pulsating flow ejector of optimal mechanical design. The main goal of the dissertation is to create a pulsating flow ejector capable of improving the technology of beregent iron removal from water by applying the novelty of the mechanical construction of the pulsating flow ejector, taking into account the results of complex theoretical and experimental research of pulsating flow in the developed ejector. In order to achieve the goal of the research, the following tasks were solved: an analysis of the scientific literature on the characteristics of ejector structures and involved in ejection flow the hydrodynamic processes. Analytically investigated the pulsating flow of the hydrodynamic parameters characteristics. A prototype of a pulsating flow ejector has been developed based on the generation of an acoustic field in the ejected flow during mixing with the working fluid when their flow rate change. Was investigated experimentally created a pulsating flow ejector with influence of hydrodynamic parameters of oxygen solubility in water and iron coagulation.

The dissertation consists of an introduction, 3 chapters, general conclusions, references and four annexes.

The introductory chapter discusses the research problem, presents the relevance of the work, describes the research methodology, the scientific novelty of the work is indicated, practical significance of the work results and defensive statements. At the end of the introduction, the publications and reports published by the author on the topic of the dissertation and the structure of the dissertation are presented. The first chapter presents the pulsating flow generating devices and the analysis of their constructions, the processes involved in a pulsating flow ejector. At the end of the chapter, conclusions are formed and the tasks of the dissertation are specified.

The second chapter presents theoretical and analytical research of the pulsating flow generated by the ejector.

The third chapter describes the experimental research of the pulsating flow ejector and presents the research methodology. Analyzed in detail of generated sound pressure characteristics dependence of acoustic field generator designs.  The efficiency of the reactions taking place in the pulsating flow ejector was evaluated.

Nine publications have been published on the topic of the dissertation: seven  in peer – reviewed scientific journals, two – in other publications. A Lithuanian patent was obtained for the invention “Pulsed Flow Ejector”.


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122 p.
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