매트릭스합성 분산법에 의해 제조된 다이아몬드 나노유체의 대류열전달 특성
Convective heat transfer characteristics of diamond nanofluid produced by matrix synthetic method
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초록
지구 온난화 현상과 유가급등에 따른 에너지 부족 현상은 생산된 에너지의 효율적인 사용과관리 문제를 부각시켰다. 이에 열교환기의 에너지 효율 향상을 위한 새로운 방안이 요구되었고 새로운 작동유체로서 나노유체의 열전달 특성 연구가 필요한 실정이다. 나노유체의 전도열전달특성의 경우 많은 선행연구에서 예측 가능한 패턴을 보이며 증가한 반면, 대류열전달 특성의 경우 특성이 명확하지 않아 추가적인 연구가 필요한 실정이다. 본 연구에서는 25℃, 50℃의 입구온도 조건에서 레이놀즈수와 나노유체의 vol%를 증가시키며 실험을 수행하였다. 수행 결과 레이놀즈수와 vol%, 입구온도가 증가할수록 대류열전달계수가 향상되었다.
Abstract
The effective use and management of energy resources has been issued to solve the global warming problem and petrolium price increase. To improve the energy efficiency of a heat exchanger, a new countermeasure is required and the heat transfer research of nano-fluids as a new working fluid is needed. This study was carried out with increasing the Reynolds number and the vol% of nano-fluids in the inlet temperature of 25 and 50 . As the result, the higher the entrance temperature is, the higher the convective heat transfer coefficient is.
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