CAJ | 학술논문

为了探索卧式螺旋管内流动沸腾传热恶化特性及预测准则，进行了以 R134a 为工质的实验研究．实验结果表明：在高干度区，低质量流速时一般内侧壁温先飞升，外侧壁温后飞升，但起飞点的间距较小，且飞升点在干度为0.73附近；高质量流速时，内、外侧壁温几乎同时飞升，飞升点发生在干度为0.78附近．进一步分析了临界热流密度与干度的关系及热流密度对平均传热系数的影响．根据实验结果，拟合出了适用于卧式螺旋管内流动沸腾传热恶化发生时的预测模型，经实验验证，预测值与实验值吻合较好．
위료탐색와식라선관내류동비등전열악화특성급예측준칙，진행료이 R134a 위공질적실험연구．실험결과표명：재고간도구，저질량류속시일반내측벽온선비승，외측벽온후비승，단기비점적간거교소，차비승점재간도위0.73부근；고질량류속시，내、외측벽온궤호동시비승，비승점발생재간도위0.78부근．진일보분석료림계열류밀도여간도적관계급열류밀도대평균전열계수적영향．근거실험결과，의합출료괄용우와식라선관내류동비등전열악화발생시적예측모형，경실험험증，예측치여실험치문합교호．
An investigation was experimentally carried out with R134a to explore flow boiling heat transfer deterioration characteristics and its prediction criterion in horizontal helically-coiled tubes. The results show that in high quality area,the inside wall temperature soars generally and then the outer wall temperature rises in low mass flow rate;but their take-off point spacing is small and rising point is about the quality of 0.73.The inside and outside wall temperature soars nearly simultaneous-ly in high mass flow rate,and rising point is about the quality of 0.78.The relationship between the critical heat flux and the quality and the influence of heat flux on the average heat transfer coefficient are analyzed.Based on the experimental results,the prediction model of heat transfer deterioration for flow boiling heat transfer in the horizontal helically-coiled tube is developed.It is verified that the predicted values are in agreement with the experimental values.