Experimental study on the role of nanoparticle deposition in pool boiling CHF enhancement using nanofluids

나노유체 이용한 풀비등 임계열유속 증가에서 나노입자 유착물의 영향에 관한 실험적 연구

  • 김형대 (포항공과대학교 기계공학과 대학원) ;
  • 김선태 (포항공과대학교 기계공학과 대학원) ;
  • 안호선 (포항공과대학교 기계공학과 대학원) ;
  • 김무환 (포항공과대학교 기계공학과)
  • Published : 2007.05.30

Abstract

It has been well known that pool boiling CHF in nanofluids compared to pure water significantly increase due to the deposition of nanoparticles on heater surface. This study concerns the characteristics of the nanoparticle deposition layer and its influence on CHF. Pool boiling experiments were carried out with 0.01vol.% water-$TiO_2$ nanofluids to obtain various nanoparticle-deposited heaters. CHF on the prepared heaters was measured during pool boiling in pure water. The heater surfaces were visualized using scanning electron microscope (SEM) and also characterized using contact angle and capillarity. The results showed that the CHF enhancement in nanofluids was completely dependent upon the structural and physicochemical characteristics of the nanoparticle deposition layer.

Keywords