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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC

ISBN : 0-89116-909-1

International Heat Transfer Conference 9
1990, 19-24 August, Jerusalem, Israel

ONSET OF NUCLEATE BOILING, HEAT TRANSFER, VOID FRACTION AND PRESSURE DROP IN SUBCOOLED CONVECTIVE BOILING WITH R12

Get access DOI: 10.1615/IHTC9.4160
pages 419-424

Аннотация

Detailed knowledge of th physical phenomena involved in subcooled boiling is of great importance for the design of liquid-cooled heat generating systems with high heat fluxes. Experimental data of heat transfer, void fraction and pressure drop were obtained for forced convective boiling of dichloro- difluoroethane (R 12). The flow is circulated upwards through a concentric annular vertical channel. The reduced pressure studied were 0,24 ≤ p/pcritO,8, inlet subcooling varing from 10 to 75 K and mass fluxes from 500 to 3000 kg/m2s, which corresponds to Re numbers from 30 000 to 300 000. For correlating the void fraction in subcooled flow , the drift flux model by Zuber was extended, by introducing a new equation for the distribution factor Co with the Jakob- and Froude-number as variables.
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