年間 8 号発行
ISSN 印刷: 1065-5131
ISSN オンライン: 1563-5074
Indexed in
NUCLEATE POOL BOILING OF R-123 ON PORED SURFACES
要約
The role of pore geometry (pore diameter dp and pore pitch Pp) on pore/subtunnel surfaces was investigated using the refrigerant R-123, and the results are compared with those of R-134a. Nine samples had 0.1 ≤ dp ≤ 0.3 mm and 0.75 ≤ Pp ≤ 3.0 mm. The trend of heat transfer coefficients was approximately the same as that of R-134a. It increased as the pore size increased and pore pitch decreased. The heat transfer coefficients of R-123 were lower than those of R-134a, which may be attributed to the superior thermo-physical properties (vapor density, latent heat of vaporization) of R-134a, although the bubble dynamic parameters (bubble departure diameter, frequency) were favorable to R-123. Comparison of the data with existing values revealed poor prediction, and a new model was proposed. The new model predicted most (92% of the R-123 and 76% of R-134a) of the data were within ± 40%.
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