Vaporization during circulation of a non-azeotropic mixture in a heated channel

Binary non-azeotropic mixtures are increasingly used in various heat exchange devices as a heat carrier or working fluid. When using non-azeotropic mixtures, it is necessary to take into account the features of the heat transfer process determined by specific thermodynamics of these mixtures. This p...

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Bibliographic Details
Main Authors: Zhukov, Vladimir E., Mezentseva, Nadezhda N., Mezentsev, Ivan V.
Format: Conference Proceeding
Language:English
Subjects:
Equilibrium conditions
Ethanol
Heat exchange
Heat transfer
Temperature distribution
Vaporization
Water circulation
Working fluids
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Summary:Binary non-azeotropic mixtures are increasingly used in various heat exchange devices as a heat carrier or working fluid. When using non-azeotropic mixtures, it is necessary to take into account the features of the heat transfer process determined by specific thermodynamics of these mixtures. This paper presents the results of a study of hydrodynamics and heat transfer during circulation of an alcohol-water mixture through a heated cylindrical channel. The inner diameter of the channel is 7.6 mm, the length is 4 m. The experiments were carried out using a mixture of ethyl alcohol and water at mass concentration of the volatile component of 22 %. Mass velocity range is 160–720 kg/(m2·s), the vessel pressure is 0.02 MPa. The operating parameters correspond to both single-phase and two-phase heat transfer regimes. A detailed description of the experimental setup and the results on temperature distribution along the working section are given. It is found that in a non-azeotropic mixture, the vaporization process begins significantly earlier than the equilibrium conditions determine.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0068201