TED-AJ03-248 POOL BOILING HEAT TRANSFER IN AQUEOUS SOLUTIONS OF A CATIONIC SURFACTANT

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概要

• 論文の詳細を見る

• Saturated, nucleate pool boiling behavior of aqueous solutions of a cationic surfactant (Cetyltrimethyl-ammonium bromide or CTAB, molecular weight=364.5) on a horizontal, cylindrical heater and the associated bubble dynamics have been experimentally investigated. Boiling curves (q^"_w versus△T_<sat>) for different concentration solutions, enhanced heat transfer coefficient data, and photographic records of the salient features of the bubbling characteristics are presented. The surfactant additive is seen to appreciably change the phase-change characteristics of water, and the attendant enhancement in nucleate boiling is observed to increase with surfactant concentration. An optimum enhancement level is seen in solutions at or near the critical micelle concentration (c.m.c.) of the surfactant; in fact, there is considerable deterioration in heat transfer with higher concentration (> c.m.c.) solutions. The photographic and visual observations indicate that the boiling behavior of surfactant solutions is characterized by an early incipience of regularly-shaped smaller-sized bubbles, which form nucleation patches with bubble clustering on the heater surface, have a reduced tendency for coalescence, and significantly higher bubble departure frequencies. Also, the enhanced performance in pre-micellar concentrations is shown to depend on the dynamic surface tension, ionic nature, and molecular weight of the surfactant.

• 一般社団法人日本機械学会の論文

著者

• MANGLIK Raj

  Thermal-Fluid & Thermal Processing Laboratory, University of Cincinnati

• Manglik Raj

  Thermal-fluids And Thermal Processing Laboratory Department Of Mechanical Industrial And Nuclear Eng

• ZHANG Juntao

  Thermal-Fluids and Thermal Processing Laboratory Department of Mechanical, Industrial and Nuclear En

• Zhang Juntao

  Thermal-fluids And Thermal Processing Laboratory Department Of Mechanical Industrial And Nuclear Eng

関連論文

• TED-AJ03-132 COMPUTATIONAL SIMULATION OF LATERAL VORTEX STRUCTURE AND ENHANCED LAMINAR FORCED CONVECTION IN WAVY-PLATE CHANNELS
• TED-AJ03-248 POOL BOILING HEAT TRANSFER IN AQUEOUS SOLUTIONS OF A CATIONIC SURFACTANT

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