CAJ | 학술논문

为了发展适于螺旋管内流动沸腾传热系数关联式，基于流动沸腾传热机理，引入参数Dn 数来修正复杂管道对传热系数的影响，并经过回归计算确定Dn 数的指数，从而发展了螺旋管内流动沸腾传热系数关联式。进一步分析了传热系数预测值与实验值的偏差随流量、干度的变化情况。利用以R134a为介质的螺旋管传热实验数据验证了该关联式的适用性，并采用平均相对误差（the mean relative error，MRE）和均方根误差（the root mean square error，RMSE）来衡量预测结果的准确性，计算出MRE在8.23％范围内，RMSE为0.532。该平均相对误差值和均方根误差值都比较小，表明回归计算结果符合要求。因此，复杂管道引入参数Dn 数建立传热系数关联式是非常适用的，并值得推广应用。
위료발전괄우라선관내류동비등전열계수관련식，기우류동비등전열궤리，인입삼수Dn 수래수정복잡관도대전열계수적영향，병경과회귀계산학정Dn 수적지수，종이발전료라선관내류동비등전열계수관련식。진일보분석료전열계수예측치여실험치적편차수류량、간도적변화정황。이용이R134a위개질적라선관전열실험수거험증료해관련식적괄용성，병채용평균상대오차（the mean relative error，MRE）화균방근오차（the root mean square error，RMSE）래형량예측결과적준학성，계산출MRE재8.23％범위내，RMSE위0.532。해평균상대오차치화균방근오차치도비교소，표명회귀계산결과부합요구。인차，복잡관도인입삼수Dn 수건립전열계수관련식시비상괄용적，병치득추엄응용。
In order to develop flow boiling heat transfer coefficient correlations for helically coiled tube,based on the mechanism of flow boiling heat transfer.The Dn factor was introduced to consider complex pipeline effects on flow boil-ing heat transfer.The index of the Dn factor was gained by using the regression method.And relation of the ratio of the experimental and predicted values with the mass flow rate and vapor quality was further analyzed.A new heat transfer coefficient correlation of flow boiling in helically coiled tube was developed.The applicability for the heat transfer coef-ficient correlation was validated by experimental data of flow boiling heat transfer in helically coiled tube with R134a. The MRE and the RMSE were used to measure the accuracy of regression results,with MRE and RMSE being 8.23%and 0.532,respectively.The MRE and the RMSE were small,the regression results conformed to the requirements. Therefore,the method is very applicable,and is worthy of popularization.