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Microgravity Science and Technology

, Volume 24, Issue 3, pp 139–146 | Cite as

Experimental Investigation of Nucleate Boiling on a Thermal Capacitive Heater Under Variable Gravity Conditions

  • Sebastian FischerEmail author
  • Stefan Herbert
  • Axel Sielaff
  • Elena Maja Slomski
  • Peter Stephan
  • Matthias Oechsner
S.I. Gravitational Effects on Liquid

Abstract

In the present work the behavior of single vapor bubbles of FC-72, generated on a thermal capacitive heater element, has been investigated during microgravity. A newly developed heater design allows temperature measurements by highspeed infrared thermography on the backside of the heater surface at a distance of approx. 800 nm from the fluid/heater-interface. The employed heater was manufactured by Physical Vapor Deposition (PVD) of a chromium based layer for better emissivity (Slomski et al., Mater Sci Technol 41:161–165, 2010) and a pure chromium heating layer supplying the energy required for bubble generation and sustainment by electrical heating. The thermal diffusivity of the employed Calcium Flouride (CaF) heater substrate is comparable to the thermal diffusivity of stainless steel, which makes this heater design very close to technical applications. The acquired transient temperature fields of the heater surface allow numerical determination of the local heat flux from the heater surface to the fluid. A local temperature drop and high heat fluxes have been observed in the vicinity of the 3-phase contact line. This effect has already been reported by former publications for thin stainless steel foil heaters (Stephan and Hammer, Int J Heat Mass Transfer 30:119–125, 1994; Wagner et al., Int J Heat Mass Transfer 42:875–883, 2006) and is also confirmed for heaters with significantly higher thermal capacities.

Keywords

Nucleate boiling Microgravity 3-phase contact line Microregion Infrared thermography 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Sebastian Fischer
    • 1
    Email author
  • Stefan Herbert
    • 1
  • Axel Sielaff
    • 1
  • Elena Maja Slomski
    • 2
  • Peter Stephan
    • 1
  • Matthias Oechsner
    • 2
  1. 1.Institute for Technical ThermodynamicsTechnische Universität DarmstadtDarmstadtGermany
  2. 2.State Material Testing Institute Darmstadt, Institute for Material Technology, Surface Technology and CorrosionTechnische Universität DarmstadtDarmstadtGermany

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