Data for: Direct tests of fluid-to-fluid scaling expressions for supercritical heat transfer in tubes

Wall temperature measurements were obtained with closely spaced T-type thermocouples in an electrically heated tube with 8 mm ID containing Refrigerant R134a flowing vertically upwards. The applied pressure, mass flux, heat flux and local bulk temperature were determined by scaling the conditions in previous measurements in CO2 following the fluid-to-fluid scaling expressions of Zahlan, Groeneveld and Tavoularis (2014). Two data sets are provided, containing, respectively, measurements under conditions for normal and deteriorated heat transfer. The ranges of conditions are: pressure fixed at 1.13 times the critical pressure; mass flux from 212 to 1609 kg /(m^2 s); heat flux from 2 to 137 kW/m^2; inlet temperature from 62 to 105 deg C. The bulk fluid enthalpy along the heated tube was calculated using the energy equation. Local values of the thermophysical properties were computed from specified values of pressure and bulk temperature using the NIST software. The files also contain values of previous measurements in carbon dioxide and estimates in water (computed from look-up tables) at equivalent conditions to the R134a data.

在电加热管中，通过紧密排列的T型热电偶获取了壁面温度测量数据。该电加热管内径为8毫米，其中填充了垂直向上流动的制冷剂R134a。通过将先前在二氧化碳中进行的测量条件进行缩放，并遵循Zahlan、Groeneveld和Tavoularis（2014）提出的流体-流体缩放公式，确定了所施加的压力、质量通量、热通量和局部总体温度。提供了两个数据集，分别包含在正常和恶化传热条件下的测量数据。条件范围如下：压力固定在临界压力的1.13倍；质量通量从212至1609 kg/(m^2 s)；热通量从2至137 kW/m^2；入口温度从62至105摄氏度。利用能量方程计算了加热管沿程的总体流体焓值。通过NIST软件，根据指定的压力和总体温度值计算了局部热物理性质。文件中还包含了在等效条件下的二氧化碳先前测量值以及水（通过查找表计算得出）的估算值，这些等效条件与R134a数据相对应。