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수직 증발관에서 CaSO<sub>4</sub> Scale 형성과 열전달에 관한 연구
홍춘근,최만수,Hong, Choonkeun,Choi, Mansoo 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.11
A study of scaling and heat transfer has been carried out for a vertical tube evaporator in which $CaSO_4$ saturated water flows upward. Experimental apparatus including vacuum chambers and heaters has been designed and manufactured to study scaling phenomena for three different pressures(1atm, 0.27atm and 0.16atm). Overall heat transfer coefficients have been measured and shown to decrease with time as scaling proceeds. After the end of experiments, the vertical tube has been cut to measure the thickness of scale at different heights. Below the height where the bulk fluid temperature does not reach saturated temperature, the thickness of scale increases, however, beyond that height occurring saturated condition, the thickness does not vary much or even decreases a little. The measured fouling resistances also support these variations of scale thickness.
내부제트 분사를 이용한 새로운 광섬유제조 화학증착 방법에 관한 연구
홍춘근,최만수,Hong, Choon-Keun,Choi, Man-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4
The present study has proposed a novel aerosol CVD utilizing an internal jet in the conventional MCVD reactor for the purpose of enhancing the deposition efficiency(and rate) and the uniformity of deposited film. The use of impingement of high temperature jet through a thin inner tube ensures the reduction of non-uniform particle deposition zone as well as higher thermophoretic particle deposition. It is shown that significant improvements have been achieved for both aspects of deposition efficiency and uniformity. As jet temperatures increase, the tapered length is reduced and deposition efficiency is significantly increased.