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Study on the Drag Reduction and Heat Transfer Efficiency Reduction of the Non-Ionic Surfactant  

Cho, Sung-Hwan (Department of Mechanical and Automotive Engineering, Jeonju University)
Tae, Choon-Seob (Building Energy Research Center, KIER)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.19, no.2, 2007 , pp. 133-141 More about this Journal
Abstract
The drag reduction (DR) and heat transfer efficiency reduction (HTER) of nonionic surfactant according to the fluid velocity, temperature and surfactant concentration were investigated experimentally. For this study, several kinds of new surfactant which contains amine-oxide and betaine were developed. And experimental apparatus equipped with two water storage tanks temperature controlled, pumps, testing pipe network, two flowmeters, two pressure gauges, heat exchanger, and data logging system was built. Results showed that existing alkyl ammonium surfactant (CTAC) had DR of $0.6{\sim}0.8$ for $1,000{\sim}2,000\;ppm$ in fluid temperature of $50{\sim}60^{\circ}C$ and had very low DR in fluid temperature over $70^{\circ}C$. And new amino oxide and betaine surfactant (SAOB) had lower DR in fluid temperature of $50{\sim}60^{\circ}C$ compared with CTAC but in fluid temperature of $70{\sim}80^{\circ}C$ DR was $0.6{\sim}0.8$ for 1$1,000{\sim}2,000\;ppm$.
Keywords
Drag reduction; Heat transfer efficiency reduction; Surfactant; Pressure drop;
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