Hysteresis Phenomena at Boiling in Liquid Film Flowing down the Tubes with Microarc Oxidation Coating

A study of heat transfer at evaporation and boiling in liquid film flowing down the horizontal tube bundle in tube-and-shell evaporator is reported. This bundle includes duralumin tubes with micro-arc oxidizing (MAO) treatment, which heat transfer characteristics are the subject of conducted tests....

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Bibliographic Details
Published inJournal of engineering thermophysics Vol. 33; no. 3; pp. 445 - 466
Main Authors Pavlenko, A. N., Kataev, A. I., Mironova, I. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2024
Springer Nature B.V
Subjects
Boiling
Duralumin
Evaporators
Fluid- and Aerodynamics
Heat transfer
Heat treatment
Hysteresis
Oxidation
Physics
Physics and Astronomy
Pressure
Thermodynamics
Tubes
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Summary:A study of heat transfer at evaporation and boiling in liquid film flowing down the horizontal tube bundle in tube-and-shell evaporator is reported. This bundle includes duralumin tubes with micro-arc oxidizing (MAO) treatment, which heat transfer characteristics are the subject of conducted tests. Refrigerant R21 at the pressure of  3 bar of absolute pressure is used as working liquid. Hot water pumped through bundle tubes used as a heat carrier. The boiling curves obtained for the tested tubes with MAO treatment showed considerable heat transfer enhancement in comparison with plain tube; however, hysteresis phenomena due to a porous structure of micro-arc oxidizing coatings are revealed. These phenomena should be taken into account at operating heat transfer equipment.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1810-2328
1990-5432
DOI:10.1134/S1810232824030019