Effect of the Prandtl number on the convective heat transfer from rotating disks

转盘系统中的对流换热问题在科学和工程应用中有着广泛的应用。目前，已积累了大量不同类型旋转盘结构内流动和对流换热传质的实验和计算数据，但Prandtl数Pr对系统的影响尚不清楚。实验数据仅适用于空气(Pr=0.71)，对于理论关联缺乏共识。拟议项目的目标是通过对放置在装满纯水和水-甘油混合物的水池中的自由旋转圆盘的对流换热进行实验研究来弥合这一基本差距。这种方法能够系统地研究Prandtl数形式2到10,000阶的影响。此外，在Pr=7的情况下，首次使用大型拖曳水箱(在TUHH)测量旋转和横流的综合效应。这项实验活动也得到了计算流体力学研究的支持。结合实验数据，该方法提供了很大的潜力来阐明所涉及的流体动力和热边界层之间的复杂相互作用及其相互作用。

Convective heat transfer problems in rotating disk systems are widespread in scientific and engineering applications. For time being, large volume of experimental and computational data on flow and convective heat and mass transfer in different types of rotating disk configurations have been accumulated, but the systematic influence of the Prandtl number Pr is still unknown. Experimental data are only available for air (Pr = 0.71), and there is a lack of consensus with regard to theoretical correlations. The objective of the proposed project is to close this fundamental gap by means of experimental investigations of the convective heat transfer from a freely rotating disk placed in a pool filled with pure water and water-glycerine mixtures. This approach enables the systematic investigation of the effect of the Prandtl number form order 2 up to 10,000. Furthermore, the combined effect of rotation and crossflow can be measured for Pr = 7 for the first time by employing a large-scale towing tank (at the TUHH). The experimental campaign is also supported by computational fluid dynamics studies. Together with the experimental data, that approach offers a great potential to clarify the complex interaction between the involved hydrodynamical and thermal boundary layers and their interaction.