CAJ | 학술논문

采用淬火法对质量分数为0.002%的氧化石墨烯水悬浮液的瞬态沸腾特性进行了表征。通过对三种代表性工况的对比分析研究了氧化石墨烯在沸腾表面的沉积对淬火沸腾过程的影响。由于氧化石墨烯在过渡沸腾阶段的沉积，水悬浮液的淬火过程较之去离子水缩短了约10 s，临界热通量则提升了约10%，对应的表面接触角从104°减小到78°。将已沉积表面再次在去离子水中淬火后，表面接触角回升到89°，临界热通量则有所回落。结果表明，氧化石墨烯的表面沉积虽然是强化临界热通量的决定性因素，但淬火过程的速率和过渡沸腾阶段的传热速率还受到氧化石墨烯的动态沉积过程和水悬浮液中悬浮氧化石墨烯的共同影响。
채용쉬화법대질량분수위0.002%적양화석묵희수현부액적순태비등특성진행료표정。통과대삼충대표성공황적대비분석연구료양화석묵희재비등표면적침적대쉬화비등과정적영향。유우양화석묵희재과도비등계단적침적，수현부액적쉬화과정교지거리자수축단료약10 s，림계열통량칙제승료약10%，대응적표면접촉각종104°감소도78°。장이침적표면재차재거리자수중쉬화후，표면접촉각회승도89°，림계열통량칙유소회락。결과표명，양화석묵희적표면침적수연시강화림계열통량적결정성인소，단쉬화과정적속솔화과도비등계단적전열속솔환수도양화석묵희적동태침적과정화수현부액중현부양화석묵희적공동영향。
The transient boiling of an aqueous suspension with graphene oxide nanosheets (GONs), at a mass fraction of 0.002%, was characterized using the quenching method. The effects of GONs deposited on the boiling surface were compared among three representative cases. With the deposition of GONs during the transition boiling phase, the quenching period of the suspension was shortened by 10 s as compared to that of deionized water, while the critical heat flux (CHF) was improved by 10%and the contact angle was reduced from 104° to 78°. After subsequent quenching of the boiling surface with GON deposition in deionized water, the contact angle was increased to 89° and the CHF was somewhat deteriorated. It was concluded that the enhancement of CHF is primarily resulted from surface deposition of GONs. The quenching speed and the heat transfer rate during the transition boiling phase are also affected by the dynamic deposition process and the suspended GONs.