本文报道了R-113在三根水平管内冷凝时的传热和压降数据的实验研究结果。一根管子是光滑的，两根管子有不同节径比的扭带插入物。以光滑管为基础，与带扭带插入物的管的数据进行比较。在测试的质量流量范围内，在标称面积的基础上，扭带插入物在光滑管上的传热系数提高了23%。提出了一个关联式，用于预测扭带插入管内冷凝时的总平均传热系数。提出的相关性预测本研究和其他研究者的大部分实验数据在+/-30%范围内。压降数据通过现有的关联式进行了令人满意的关联。 引文:ASHRAE Transactions，1983年，第89卷，pt。新泽西州大西洋城1A

The paper reports the results of an experimental investigation in which heat transfer and pressure drop data were taken during condensation of R-113 inside three horizontal tubes. One tube was smooth, and two had twisted tape inserts with different pitch-to-diameter ratios. The smooth tube was used as a basis for comparison with the data of the tubes with twisted tape inserts. Over the mass flux range tested, the twisted tape inserts enhanced the heat transfer coefficients by as much as 23% over the smooth tube, on a nominal area basis. A correlation equation was proposed for predicting the overall average heat transfer coefficient during condensation inside tubes with twisted tape inserts. The proposed correlation predicted most of the experimental data of the present study and studies of other investigators to within +/-30%. The pressure drop data were satisfactorily correlated by existing correlations.