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계면활성제에 의한 난류 관내 유동에서의 마찰저감 현상에 관한 실험적 연구
신광호(Kwang-Ho Shin),윤형기(Hyung-Kee Yoon),장기창(Ki-Chang Chang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This is to characterize the fluid mechanics of surfactant water solutions, which exhibit drag reduction in the turbulent flow(when compared to pure water). The stress is placed on those fluid characteristic aspects of drag reducing solutions which are relevant for application in closed circulation loops(for the purpose of savings of pumping power), like hydronic cooling and heating systems in building. The tests are done with the solution of the surfactant DR-IW616 in concentration of 100~3000 ppm.<br/> The following are the main problems studied: diameter effect, concentration, temperature and fluid characterization(drag reducing ability).
순환루프에서 계면활성제의 마찰저감 퇴화 현상에 관한 실험적 연구
신광호(Kwang-Ho Shin),윤형기(Hyung-Kee Yoon),장기창(Ki-Chang Chang),나호상(Ho-Sang Ra),유성연(Seong-Yeon Yoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The objective of this study is to investigates phenomenon of surfactant drag reduction degradation by temperature and mechanical stress in circulation loop. The two kinds of degradation affected micelles or supermicellar structures in surfactant water solutions appear temporarily or permanently. The primary two factors of degradation by surfactant solution DR-IW 616 were experimentally studied. The interaction between degradation and the chemical materials - the biocide(Nalco 7331) and anticorrosive(NaNO₂) additives were also investigated.
장기창(Ki-Chang Chang),윤형기(Hyung-Kee Yoon),박성룡(Seong-Ryong Park),백영진(Young-Jin Baik),나호상(Ho-Sang Ra),신광호(Kwang-Ho Shin) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Along with socioeconomic development and improving standard of living, the heat demand for heating and cooling in residential and commercial sectors is expected to expand rapidly, reaching over 43 million TOE by 2010 in Korea(about 80% increase compared with that in 1995). Since most of this heat demand is low temperature below 60℃, the utilization of ""unused energy"" is surely one of very effective measures to both environmental preservation and energy conservation. ""Unused energy"" in this paper is implicated as ""temperature differential energy"" available from treated sewage water, useful and abundant heat source for heat pump(cooler in summer and warmer in winter than outside air). An analysis was carried out to estimate the energy potential of treated sewage water for heat pump heat source. Some analysis were taken to study the characteristics of a heat pump system using the treated sewage water as heat source.