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Infrared thermography measurement of two-phase boiling flow heat transfer in a microchannel.

Author(s) : LIU T. L., PAN C.

Type of article: Article

Summary

In this study, a non-intrusive method to directly measure the fluid temperature and two-phase flow patterns in micro-scale system was developed. To achieve this goal, an adequate calibration process of infrared (IR) thermography measurement and an experimental design of IR transparent convective flow in a microchannel were established. The temperature distribution of the fluid along the microchannel was measured by IR thermography through a germanium window of thickness 5?mm. The transparent germanium window was used to facilitate the transmission of long-wavelength IR rays. The infrared images were obtained at a frame rate of 200?fps, which enabled observation of the transient temperature behavior during flow boiling in the microchannel. A semi-transparent liquid, namely ethanol, was used as the working fluid, with a mass flux of 20.3?kg/m2s and heat flux range of 3.1–244.1?kW/m2. The experimental results confirmed that IR thermography could be used to capture the transient single- and two-phase flow patterns as well as the fluid temperature along the channel. To the best of our knowledge, this paper is the first presentation of IR visualization of two-phase flow patterns in a microchannel. The trends of the local heat transfer coefficients with respect to the two-phase flow patterns are discussed, and the experimentally determined coefficients are compared with those calculated by commonly used equations.

Details

  • Original title: Infrared thermography measurement of two-phase boiling flow heat transfer in a microchannel.
  • Record ID : 30016996
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 94
  • Publication date: 2016/02/05
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.10.084

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