Flow and Heat Transfer Characteristics in a Direct Contact Volume-Type Evaporation Process

• FUJITA Yasunobu

  Department of Mechanical Engineering, Kyushu University

• HIRAHAYA Kunio

  Department of Mechanical Engineering, Kyushu University

• NISHIKAWA Kaneyasu

  Kurume College of Technology

抄録

Flow and heat transfer characteristics of refrigerant R 113 injected dispersively into hot water are investigated based on the flow pattern observation and local flow and heat transfer measurements. Heat transfer characteristics are strongly influenced by the boiling regime just downstream of the nozzle outlet. An increase of inlet temperature of both liquids or an increase of the nozzle Reynolds number promotes evaporation and bubble coalescence. As a result, the boiling regime changes from an unstable one to a stable and further to a column-like one, and heat transfer is improved in accordance with this order of the boiling regime. In the column-like boiling regime in which the highest performance is attained, the heat transfer coefficient is mainly influenced by both the mass velocity of liquid R 113 and the temperature driving force of water. the local and also the average value over a test section of volumetric heat transfer coefficient are correlated in terms of these two influencing parameters.

収録刊行物

• JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties

  JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 31 (3), 486-493, 1988-08-15

  一般社団法人日本機械学会

キーワード

• Phase Change
• Direct Contact Evaporator
• Boiling Heat Transfer
• Multiphase Flow
• Flow Pattern
• Void Fraction
• Bubble Velocity
• Volumetric Heat Transfer Coefficient

詳細情報

• CRID: 1570009752247862528
• NII論文ID: 110002494193
• NII書誌ID: AA10680596
• ISSN: 09148817
• 本文言語コード: en
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