Effect of subatmospheric pressures on heat transfer, vapor bubbles and dry spots evolution during water boiling

Anton Surtaev, Vladimir Serdyukov, Ivan Malakhov

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The present paper reports the results of the comprehensive experimental investigation of an influence of subatmospheric pressures on multiscale heat transfer characteristics during liquid pool boiling. Experiments were carried out in the pressure range of 8.8–103 kPa at saturated water boiling using high-speed IR thermography, high-speed visualization from different sides and the specially designed transparent ITO heater. This made it possible to obtain simultaneously extensive data set on the effect of reduced pressure on main characteristics of boiling, including heat transfer coefficients, nucleation site density, growth rate and departure diameter of vapor bubbles. High-speed visualization from a bottom side of transparent heater allowed to investigate an evolution of dry spots bounded by triple contact line depending on pressure for the first time. It was demonstrated that the growth rate of dry spots is constant in time and has a non-monotonic dependence on pressure.

Original languageEnglish
Article number109974
Number of pages11
JournalExperimental Thermal and Fluid Science
Volume112
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • Boiling
  • Bubble dynamics
  • Dry spot evolution
  • Multiscale heat transfer
  • Subatmospheric pressure
  • BEHAVIOR
  • CONTACT-LINE
  • INFRARED THERMOMETRY
  • MICROLAYER
  • FLUX
  • DEPARTURE DIAMETER
  • GROWTH-RATES
  • DYNAMICS
  • SURFACE
  • POOL

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