Effect of surfactant addition on boiling heat transfer in a liquid film flowing in a diverging open channel

详细信息    查看全文

• 作者：G. Quinn ; B.M. Cetegen
• 关键词：Heat transfer ; Surfactant ; Boiling ; Foaming
• 刊名：International Journal of Heat and Mass Transfer
• 出版年：2010
• 出版时间：15 January 2010
• 年：2010
• 卷：53
• 期：1-3
• 页码：245-253
• 全文大小：935 K

文摘

An experimental study was conducted to investigate how the addition of small amounts of a surfactant influences the heat transfer characteristics in a thin boiling liquid film flowing in a diverging open channel. Heat transfer experiments were conducted with fluid inlet temperatures from 40 °C to 92 °C. The flow field on the plate included thin film supercritical flow upstream of a hydraulic jump and thick film subcritical flow downstream of a hydraulic jump. Nusselt numbers for the non-boiling heat transfer without surfactant addition scaled linearly with the film Reynolds number. The boiling heat transfer produced higher Nusselt numbers with a weaker dependence on the Reynolds number. Experimental results showed that a boiling surfactant solution created a thick foam layer with high heat transfer rates and Nusselt numbers that are very weakly dependent on the inlet flow rate or the inlet Reynolds number.