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학술저널
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대한설비공학회 International Journal of Air-Conditioning and Refrigeration International Journal of Air-Conditioning and Refrigeration Vol.14 No.4
발행연도
2006.12
수록면
147 - 155 (9page)

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The drag reduction(DR) and heat transfer efficiency reduction(ER) of non-ionic surfactant were investigated as a function of fluid velocity, temperature, and surfactant concentration. An experimental apparatus consisting of two temperature controlled water storage tanks, pumps, test specimen pipe and the piping network, two flow meters, two pressure gauges, a heat exchanger, and data logging system was built. From the experimental results, it was concluded that existing alkyl ammonium surfactant(CTAC Cethyl Trimethyl Ammonium Chloride) had DR of 0.6~0.8 at 1,000~2,000 ppm concentration with fluid temperature ranging between 50~60℃. However, the DR was very low when the fluid temperature was 70~80℃. The new amine oxide and betaine surfactant(SAOB Stearyl Amine Oxide+Betaine) had lower DR at fluid temperatures ranging between 50~60℃ compared with CTAC. However, with fluid temperature ranging between 70~80℃ the DR was 0.6~0.8 when the concentration level was 1,000~2,000 ppm.

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ABSTRACT
1. Introduction
2. Drag reduction surfactants
3. Experiments on drag and heat transfer efficiency reductions
4. Results and discussion
5. Conclusions
References

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