Evaporation and Boiling Heat Transfer at Film Irrigation of Horizontal Roughened Tubes

Industrial shell and tube heat exchangers require often pipes of considerable length. The surface treatment of such tubes to enhance heat transfer parameters of the equipment must be cheap and simple in manufacturing. Two kinds of tube surface treatment are compared: sandblasting and machining. The...

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Bibliographic Details
Published in:Journal of engineering thermophysics 2023-12, Vol.32 (4), p.657-671
Main Authors: Pavlenko, A. N., Kataev, A. I., Mironova, I. B.
Format: Article
Language:English
Subjects:
Boiling
Duralumin
Evaporation
Evaporators
Fluid- and Aerodynamics
Heat flux
Heat transfer
Machining
Physics
Physics and Astronomy
Sandblasting
Shell and tube
Surface treatment
Thermodynamics
Tube heat exchangers
Tubes
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Summary:Industrial shell and tube heat exchangers require often pipes of considerable length. The surface treatment of such tubes to enhance heat transfer parameters of the equipment must be cheap and simple in manufacturing. Two kinds of tube surface treatment are compared: sandblasting and machining. The tubes with OD = 10 mm, ID = 6 mm, and 625 mm long were tested within a bundle of horizontal tubes installed in a rectangular evaporator shell. Hot water pumped through bundle tubes used as a heat carrier. Refrigerant R21 at the pressure of  3 bara is used as working liquid. Tests have been performed at   numbers from 500 to 1500. The micro-rough tubes (machined duralumin tube, sandblasted copper tube) provide considerable heat transfer enhancement at transition to bubble boiling. At low heat fluxes (evaporation regime) heat transfer on these tubes are close to plain tubes.
ISSN:1810-2328
1990-5432
DOI:10.1134/S181023282304001X