DOI: https://doi.org/10.15587/1729-4061.2014.20316

Boiling heat transfer on smooth and porous surfaces in the limitted space

Ольга Сергеевна Алексеик, Владимир Юрьевич Кравец

Abstract


When designing passive cooling systems for radioelectronic and computer equipment based on conventional and miniature heat pipes it is necessary to carry out a preliminary estimation of heat transfer characteristics. For calculating heat transfer capacity of a heat pipe it is necessary to possess information about heat transfer intensity at phase transitions in the zones of heating and condensing.

The results of experimental studies of heat transfer coefficients when boiling on smooth and porous surfaces under conditions of a large and limited volume are given. There is a significant influence of a free space height above the heat transfer surface on a heat removal intensity rate under phase transition. The criterial dependencies, obtained from the analysis and synthesis of experimental data, are given. The given equations allow calculating heat transfer coefficients in relation to geometrical and operational parameters in the range of Reynolds numbers Re=400…2•105 and for free space heights, satisfying the condition of (h/lc)=1…10 for smooth surfaces, as well as in the range of Reynolds numbers from 150 to 3000 for metal-fiber capillary structures 0.7-1.0 mmthick and porosity within the range of 75-85 % of the spaces between the CPS (a capillary porous system) surface and the upper wall from 2 to20 mm. The error of the obtained result does not exceed 20 %.


Keywords


heat transfer intensity; empirical dependence; boiling; limited volume; porous structure

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061