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고출력 레이저 어블레이션에 의한 실리콘 가공시 발생하는 상폭발현상에 관한 연구
정성호,Yoo, J.H.,Greif, R.,Russo, R.E. 한국레이저가공학회 2000 한국레이저가공학회지 Vol.3 No.3
The volume and depth of the craters produced on silicon samples during high power laser ablation show a strong nonlinear change as the laser irradiance in closes across a threshold value, approximately 2.2X1010 W/cm². Time-resolved shadowgraph images of the ablation plume reveal the ejection of large particulates from the sample for laser irradiance above the threshold, with a time delay of about 300-400 ns. The numerically estimated thickness of the superheated liquid layer, considering the transformation of liquid metal into liquid dielectric near the critical state, agrees with the measured agrees with crater depths. It is suggested that a phase explosion of the deep superheated liquid layer near the critical state is responsible for the measured sudden increase of crater volume and the ejection of large particulates.
Transport phenomena in a steam-methanol reforming microreactor with internal heating
Suh, J.S.,Lee, M.T.,Greif, R.,Grigoropoulos, C.P. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.1
An experimental and theoretical study of steam reforming of methanol is carried out in a packed-bed microreactor with internal heating. Experimental results of the methanol conversion and carbon monoxide concentration in an internally heated reformer are compared with those of an externally heated reformer. Higher methanol conversion and carbon monoxide concentration are obtained for internal heating at the same conditions. The results show the conversion efficiency of methanol and CO concentration increase with increasing internal heating rate over the range of operating conditions. A correlation for the conversion efficiency of methanol has been obtained as a function of the internal heating rate and a dimensionless time parameter which represents the ratio of the characteristic time of the methanol flow to the time for chemical reaction.