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Experimental investigation on water vaporization at subatmospheric pressure in different liquid geometrical configuration.

Number: 0395

Author(s) : LADA W., WOJTASIK K., HALON T., RULLIÈRE R., ZAJACZKOWSKI B., BONJOUR J.

Summary

The study focuses on vaporization of drops on a superheated horizontal surface under low pressure conditions (pv ~ 1.8-1.9 kPa). Owing to the capabilities of a customized heat flux sensor, experiments for isolated drop quasi-static evaporation and consecutive drops were performed. The different thermohydraulic behaviours were visualized with a high-speed camera.
For the case of quasi-static isolated drop evaporation, several stages and associated governing phenomena were identified. For the case of vaporization of drops falling sequentially, three behaviours were unveiled: in some cases, the vaporization resembles the case of quasi-static evaporation but with a greater volume of liquid. In other cases, a splashing is observed. It can be due to the fall of the drop or to the growth of a bubble within the drop. In that case, the bursting is particularly noticeable because at low pressure, bubbles tend to have a large diameter (several centimetres).

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Pages: 14 p.

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Details

  • Original title: Experimental investigation on water vaporization at subatmospheric pressure in different liquid geometrical configuration.
  • Record ID : 30031602
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0395

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