Enhancement of flow boiling heat transfer with surfactant

Abstract

The surfactant additive octadecylamine (ODA) was used to enhance the flow boiling heat transfer of water in vertical copper tube, and the effects of the aqueous solution properties, mass fraction of ODA, mass flux and heat flux etc. on flow boiling heat transfer were investigated. In order to analyze the mechanism of enhancement on boiling heat transfer with ODA, the copper surface was detected by XPS, and the diagram of binding energy was obtained. The results show that ODA can be adsorbed on the surface of the copper wall, and affects the properties of the heating surfaces and enhances the flow boiling heat transfer of water. Only in low heat flux and in a suitable range of concentration, can ODA aqueous solution enhance flow boiling heat transfer, and the suitable mass fraction of ODA is in the range of 1 × 10⁻⁵ −5 × 10⁻⁵. In addition, compared with water, ODA aqueous solution does not increase the flow drag under the same experimental conditions.

Keywords

flow boiling / heat transfer / flow drag / enhancement / additive

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