Modeling the instabilities of the condensation process of the R134a and 404A refrigerants in pipe minichannels in the conditions of periodic hydrodynamic disturbances
Abstract
In the present paper, an attempt was made to model the periodic hydrodynamic instabilities of the condensation process of a refrigerant in pipe minichannels. For this purpose, a homogenous thermodynamic model with an equilibrium condition on both sides was used, which was based on the equations of the balance of the mass, momentum and energy. These equations were used for numerical modeling of flow disturbances with a phase change. This model takes into account the complexity of multiphase flows. The accuracy of the model calculations was verified by means of the experimental results obtained. A satisfactory compliance was found for this comparison, which confirms the usefulness of the computational model proposed for the determination of the influence of periodically generated hydrodynamic disturbances on the condensation process of R134a and R404A refrigerants in pipe minichannels.
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Author Biographies
Waldemar Kuczyński is a graduate of the Koszalin University of Technology, Poland. Since 1999, he has been working as the Chair of Thermal Engineering and Refrigerating Engineering. In the year 2002, he was awarded the title of master of science in the field of machine construction and operation in the specialty of thermal engineering. In the years 2002 – 2007, he was a Ph.D. student at the Faculty of Mechanical Engineering of the Koszalin University of Technology. In the year 2008, under a project of the State Committee for Scientific Research, he defended his doctoral thesis entitled “Boiling Testing in Refrigerant Flow under the Conditions of Periodically Generated Disturbances" and in the year 2014 D.Sc. degree in Machinery Construction and Operation from Koszalin University of Technology. Since September 2008 he has been the head of the laboratory of the Chair of Thermal Engineering and Refrigerating Engineering and from 2016 he is also Deputy Dean of the Faculty of Mechanical Engineering of Koszalin University of Technology. He has authored and co-authored more than 100 articles and co-authored nine research projects (and the director of three). His chief interests focus on the issues of wave phenomena and instability during the condensation and boiling of refrigerants in conventional channels and in minichannels.
Aleksander Denis received BSc (2013) at Wroclaw University of Technology and double MSc (2015) at Warsaw University of Technology and Ecole des Mines de Nantes; currently PhD student at Koszalin University of Technology (Department of Power Engineering). His scientific interests focus on instabilities of condensation of refrigerants in mini-channels. So far he published 3 scientific papers in national journals.
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