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The effect of artificial vaporization centers on heat exchange during boiling of the film irrigating a bundle of horizontal finned pipes

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Thermophysics and Aeromechanics Aims and scope

Abstract

In industry, there is a whole class of heat exchangers with low values of specific heat fluxes: evaporators of refrigerating machines, steam generators of binary freon stations, steam generators of heat pumps, etc. Such heat exchange modes are realized when boiling in the film is just beginning, and the intensity of heat exchange during evaporation is commensurate with the heat exchange during boiling. The article presents the results of an experimental study of heat transfer during boiling on copper finned pipes, the entire surface of which is subjected to special treatment in an air stream containing corundum particles with the size below 500 microns. The result of such treatment is a significant decrease in the temperature head, at which boiling and a noticeable intensification of heat transfer, compared to a finned pipe without treatment with corundum particles, begin.

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Abbreviations

D :

pipe diameter, m

G :

irrigation density, kg/(m·s) or m3/(m·s)

h :

fin height, m

L :

dimensionless height, m

l σ, l ν— capillary and viscosity-gravitation constants, m, q :

specific heat flux, W/m2

R z :

height of roughnesses of the cooled wall, m

\(\overline {{R_z}} \) = R z/l v :

dimensionless roughness

T S :

saturation temperature, K, °C

ΔT 1 = T in − Tout :

changes of heating water temperature K, °C

ΔT = T w − T S :

temperature head in the film K, °C

y :

coordinate, m

α :

heat-transfer coefficients at boiling, W/(m2 K)

δ :

the rib thickness near its base, m

λ and λ w :

coefficients of thermal conductivity of liquid and cooled wall, W/(m·K)

μ :

dynamic viscosity, Pa·s

ν :

kinematic liquid viscosity, m2/s

ρ L, ρ v, ρ w :

densities of liquid, vapor and cooled wall, kg/m3

Re:

Reynolds number of a bundle of horizontal pipes.

L:

liquid

S:

saturation

T:

turbulent

v:

vapor

w:

wall

δ :

film.

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

    I. I. Gogonin

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  1. I. I. Gogonin
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Correspondence to I. I. Gogonin.

Additional information

The research was carried out under the state contract with IT SB RAS for the years 2021–2025 (No. 121031800216-1).

The author of the article expresses his gratitude to I.B. Mironova and A.I. Kataev for their participation in the experimental study.

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Gogonin, I.I. The effect of artificial vaporization centers on heat exchange during boiling of the film irrigating a bundle of horizontal finned pipes. Thermophys. Aeromech. 28, 697–702 (2021). https://doi.org/10.1134/S0869864321050103

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  • DOI: https://doi.org/10.1134/S0869864321050103

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