科研之友
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摘要
The liquid film is extensively used in various industrial production processes due to its excellent heat transfer efficiency, especially in the evaporating and cooling process, but little experimental data are acquired to represent the temperature field and heat transfer parameters with high spatiotemporal resolution. In this paper, planar laser-induced fluorescence (PLIF) technique was first described for the investigation of the temperature field of the liquid film in pipeline. An extraction method of fluorescence intensity based on the optimized average gray values, and a temperature field measurement method based on the two-dimensional planar laser intensity calibration were proposed, which effectively improved the temperature measurement accuracy of PLIF. The convective heat transfer coefficient of liquid film was calculated from the temperature field with high spatiotemporal resolution based on the heat transfer theory. In addition, the accuracy of PLIF temperature measurement was analyzed, and the relationships between the heat transfer coefficient and Reynolds number as well as heat transfer temperature difference were investigated experimentally.
- 出版日期2019-3
- 单位天津大学
