CAJ | 학술논문

对垂直上升的内螺纹管临界压力区内水的传热特性进行了试验研究.根据试验结果，分别在亚临界部分和超临界部分进行了传热机理分析，得到了垂直上升内螺纹管对流沸腾传热随压力、质量流速及热负荷变化的复杂关系，总结了发生传热恶化时的条件，给出了恶化趋势预报，并给出了能用于工程实际的传热试验关联式.结果表明：虽然在临界压力区内内螺纹管改善传热的特性有所减弱，CHF情况有时在过冷区就发生，但是与光管相比，内螺纹管在临界压力区内仍然能够很好地改善传热，降低壁温.
대수직상승적내라문관림계압력구내수적전열특성진행료시험연구.근거시험결과，분별재아림계부분화초림계부분진행료전열궤리분석，득도료수직상승내라문관대류비등전열수압력、질량류속급열부하변화적복잡관계，총결료발생전열악화시적조건，급출료악화추세예보，병급출료능용우공정실제적전열시험관련식.결과표명：수연재림계압력구내내라문관개선전열적특성유소감약，CHF정황유시재과랭구취발생，단시여광관상비，내라문관재림계압력구내잉연능구흔호지개선전열，강저벽온.
The heat transfer performance of near critical water in avertical up-flow internally ribbed tube was studied.It was found that heat transfer characteristics is a complicated function of pressure,mass velocity and heat flux.Correlation formula from experimental data was obtained for use in engineering design.Although in the near critical pressure region the effect of swirl on heat transfer is weaker and critical heat flux (CHF) quality is close to that in subcooled region,internally ribbed tube still performs better than smooth tube.