Author(s)

A. Maj, W. Nowak & A. Stachel

Abstract

Mixed convection in a horizontal circular channel in high pressure conditions A. Maj, W. Nowak, A. Stachel Technical University of Szczecin, department of Heat Engineering, al Piastow 19, 70-310 Szczecin, Poland Email: ktc@safona. tuniv.szczecin.pl Abstract The main aim of the research is to determine the range of mixed convection and setting the limits of its occurrence. The laboratory tests are conducted at the Technical University of Szczecin in the Department of Heat Transfer with the use of the horizontal circular heat exchanger. The measurements are made with the pressures from 0,1 to 10,0 [MPa] and different heating powers. In order to carry out the planned research and analyse its results, a criterion of mixed and free convection occurrence by Metais and Eckert [4] stating that the boundary between the free and mixed convection results from the comparison of convectional heat flux values resulting only from displacement forces (free convection) and

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