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M. M. Nishchenko, M. Ya. Shevchenko, V. I. Patoka, I. Ye. Galstyan, Yu. F. Sus’ka, and E. G. Len
«Kinetic Processes of Water-Molecules’ Adsorption–Desorption on Copper Surface under a High-Intensity Luminous Flux»
719–736 (2018)

PACS numbers: 42.79.Ek, 61.80.Ba, 68.43.-h, 68.43.Mn, 68.43.Nr, 68.43.Vx, 68.47.De

The adsorption–desorption kinetic processes with H2O molecules on the polished polycrystalline copper surface are investigated during external contactless heating by the reflex-lamp radiation and subsequent cooling of the sample after switching off the light source. The processes of thermal conductivity and radiation heat exchange codetermine a loss of energy absorbed by copper sample due to light irradiation and H2O adsorption. The modified non-stationary integral method for determination of the loss of energy consists in a measurement of sample temperature both in air and in different vacuum conditions. The massive Cu specimen covers the top of a hollow thin-walled steel socket. After preheating in a vacuum by external electromagnetic radiation to temperatures of 100–170?C and subsequent shutdown of radiation source, this sample shows, at the first stage, a cooling-down because of a heat removal and, at the second stage, a heating up on 7–21.5?C during 5–23 minutes due to heat-energy generation because of multimolecular adsorption of water on the inner and outer surfaces of the specimen. The heat power due to adsorption exceeds the primary energy flux by several times.

Keywords: adsorption–desorption of water, copper surface, luminous flux, heating/cooling kinetics in vacuum

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