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Investigation of the evaporation process and sonic limits in sodium heat pipes

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Abstract

The maximum heat fluxes in the heating zone and the sonic limits of power transfer in sodium heat pipes and vapor chambers with composite (channel) wicks are investigated experimentally.

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Abbreviations

P:

vapor pressure

T:

temperature

ρ :

density

μ :

molecular weight

L:

latent heat of vaporization

q:

specific heat flux in heating zone

Q:

specific heat transfer along heat pipe

G:

mass flow of vapor in pipe cross section

W:

average vapor flow velocity in pipe

ɛ:

surface porosity of wick

R:

universal gas constant

f:

coefficient of evaporation

β :

momentum-flux coefficient

ξ :

coefficient of friction

dv :

diameter of heat pipe vapor channel

0:

liquid surface

v:

vapor at liquid surface

w:

wall surface

in:

entrance to heating zone

so:

critical cross section

Literature cited

  1. M. N. Ivanovskii, V. P. Sorokin, and V. I. Subbotin, Evaporation and Condensation of Metals [in Russian], Atomizdat, Moscow (1976).

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  3. M. Knudsen, Ann. Phys. (Leipzig),47, 697 (1915).

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  4. I. E. Kemme, “Heat pipe capability experiments,” in: The IEEE Thermionic Conversion Specialist Conference, Houston, Texas, LA-3585 (1966).

  5. E. K. Levy, “Theoretical investigation of heat pipes operating at low vapor pressures,” Trans. ASME, Ser. B: J. Eng. Ind.,90, 547 (1968).

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  6. H. W. H. van Andel, “Heat pipe design theory,” in: the International Conference on Thermionic Electrical Power Generation, Paper D-5, Stresa (1968).

  7. L. A. Vulis, Thermodynamics of Gas Flows [in Russian], Izd. Gos. Énerg., Moscow-Leningrad (1950).

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  8. C. A. Busse, “Pressure drop in the vapor phase of long heat pipes”, in: Thermionic Conversion Specialist Conference, Palo Alto, California (1967).

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Authors
  1. M. N. Ivanovskii
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  2. V. V. Prosvetov
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  3. V. P. Sorokin
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  4. B. A. Chulkov
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  5. I. V. Yagodkin
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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 33, No. 5, pp. 832–837, November, 1977.

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Ivanovskii, M.N., Prosvetov, V.V., Sorokin, V.P. et al. Investigation of the evaporation process and sonic limits in sodium heat pipes. Journal of Engineering Physics 33, 1306–1310 (1977). https://doi.org/10.1007/BF00860904

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  • DOI: https://doi.org/10.1007/BF00860904

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