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Study of spatiotemporally resolved temperature field and heat transfer in liquid film using PLIF

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Abstract

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.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China [61671321, 61372143, 51475328 and 61828106], and the Natural Science Foundation of Tianjin in China [17JCYBJC18400].

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Authors and Affiliations

  1. College of Electrical and Information Engineering, Tianjin University, Tianjin Key Laboratory of Process Measurement and Control, Tianjin, 300072, China

    Ting Xue & Shangzhen Zhang

  2. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China

    Bin Wu

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  1. Ting Xue
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  2. Shangzhen Zhang
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  3. Bin Wu
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Correspondence to Ting Xue.

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Highlights

• Planar laser-induced fluorescence (PLIF) technique is first described for the investigation of the heat transfer performance of the falling liquid film in the pipeline.

• The optimized average gray values extraction method is proposed for calibration of temperature-fluorescence intensity with better accuracy.

• The laser intensity calibration method is proposed to acquire the temperature field of falling liquid film.

• The heat transfer coefficient is calculated and analyzed based on PLIF under different temperature difference and Reynolds number.

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Xue, T., Zhang, S. & Wu, B. Study of spatiotemporally resolved temperature field and heat transfer in liquid film using PLIF. Heat Mass Transfer 55, 845–854 (2019). https://doi.org/10.1007/s00231-018-2465-5

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  • DOI: https://doi.org/10.1007/s00231-018-2465-5

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