A modified so-called standard apparatus for heat transfer measurements in highly viscous binary fluids has been developed. It covers a viscosity range from 0.2 mPa∙s up to 1000 Pa∙s and is designed for measurements over a temperature range from 273 to 423 K. Concept and setup of the apparatus are described in detail, and uncertainties of the different elements of the measurement chain are discussed. An estimation for the total uncertainty of the heat transfer coefficient is ∆α/α = 16% (k = 2). Model mixtures consisting of polydimethylsiloxane of three different viscosities and n-pentane were chosen. The composition of the fluid is calculated with the refractive index and the temperature; a corresponding correlation was developed. N-pentane evaporates on a heated test tube, which is exchangeable and thus enables the investigation of the influence of the surface structure and of the material on the heat transfer coefficient. The design of the test tubes has been adapted to very high temperatures on the tube surface. The effects of the mandatory remixing of the two components on the heat transfer coefficient have been investigated. The modified standard apparatus was validated with pure n-pentane and the data was compared to published data in literature.

已经开发出一种改进的所谓的用于在高粘性二元流体中进行传热测量的标准设备。它的粘度范围为0.2 mPa∙s至1000 Pa∙s，设计用于在273至423 K的温度范围内进行测量。详细介绍了该设备的概念和设置，以及该设备不同元件的不确定性。讨论了测量链。用于传热系数的总不确定度估计是Δ α / α  = 16％（ķ  = 2）。选择由三种不同粘度的聚二甲基硅氧烷和正戊烷组成的模型混合物。用折射率和温度计算出流体的成分。建立了相应的相关性。正戊烷在加热的试管上蒸发，该试管是可交换的，因此可以研究表面结构和材料对传热系数的影响。试管的设计已适应试管表面上非常高的温度。已经研究了两种组分的强制性重新混合对传热系数的影响。用纯的改进的标准设备进行了验证Ñ戊烷和数据进行比较，以文献公布的数据。