单管传热系数不确定度的理论与实验分析

利用测量不确定度的方法对不同单管在蒸发和冷凝工况时的性能进行对比。分别给出了单管蒸发和冷凝传热过程中综合传热系数、管内传热系数和管外传热系数的数学模型，并在此基础上研究3个传热系数以及相关参数的不确定度评定方法。分别以蒸发和冷凝工况为实例，得出3个传热系数的不确定度及其分量，从而得出影响不确定度的因素，进而为减小测量不...

Theoretical and experimental analysis on heat transfer coefficient uncertainty of enhanced single tube

The evaporating and condensing performance of different single tubes was compared by determining the uncertainty. The mathematical models of comprehensive heat transfer coefficient, heat transfer coefficient of inner tube, and heat transfer coefficient of outer tube during the evaporating and condensing process of single tube was proposed. These heat transfer coefficients and the assessment methods of the uncertainty of associated parameters were examined. Taking the evaporating and condensing as an example, the uncertainty and its components of these heat transfer coefficients have been determined. The influential factors of the uncertainties have been found, which could provide the direction for decreasing the uncertainty during the measurements.