Development of a modified standard apparatus for heat transfer measurements in highly viscous binary fluids
Development of a modified standard apparatus for heat transfer measurements in highly viscous binary fluids
复制标题
开发用于高粘性二元流体传热测量的改进标准装置
作者：
Ann;M. Richter;R. Span
开发了一种改进的用于高粘性二元流体传热测量的所谓标准装置。它的粘度范围从0.2 mPa·s到1000 Pa·s，设计用于在273至423 K的温度范围内进行测量。详细描述了该装置的概念和设置，并讨论了测量链的不同元素的不确定性。传热系数的总不确定度的估计为α/α = 16%（k = 2）。选择了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流体的组成;开发了相应的相关性。正戊烷在加热的试管上蒸发，该试管是可更换的，因此能够研究表面结构和材料对传热系数的影响。试管的设计已经适应了管表面的非常高的温度。研究了两种组分的强制再混合对传热系数的影响。用纯正戊烷对改进的标准装置进行了验证，并将数据与文献中发表的数据进行了比较。
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.
影响因子：
2.2
作者：
A. Fleer;R. Span;M. Richter
通讯作者：
M. Richter