Conference Proceedings Paper
A Novel Infrared-Based Experimental Technique to Detect Phase Dynamics on Boiling Surfaces
NURETH-14 - 2011 September 25-30
Hyungdae Kim (Kyung Hee University)
Jacopo Buongiorno (Massachusetts Institute of Technology)
Heat transfer in nucleate boiling is strongly affected by the liquid and vapor phase distribution
on the boiling surface. A novel experimental technique for the detection of phases on boiling
surfaces is presented. The technique is based on high-speed infrared (IR) thermometry through
an IR-transparent silicon wafer heater; hence the name DEPIcT, or DEtection of Phase by
Infrared Thermometry. Where the heater surface is wet, the IR camera measures the temperature
of the hot water in contact with the heater. On the other hand, where vapor (whose IR
absorptivity is very low) is in contact with the heater, the IR light comes from the cooler water
beyond the vapor. The resulting IR image appears dark (cold) in dry spots and bright (hot) in
wetted area. Using the contrast between the dark and bright areas, we can visualize the
distribution of the liquid and gas phases in contact with the heater surface, and thus identify also
the liquid-vapor-solid contact line. DEPIcT is able to detect thin liquid layers, through the
analysis of interference patterns. Finally, the technique is applied to nucleate boiling of water at
atmospheric pressure to gain insight into the surface micro-hydrodynamics at high heat fluxes,
all the way up to CHF.
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