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Determination of absorption of thermal radiation by black and silvery body surfaces

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Author Affiliations

  • 1Department of Physics, College of Science, University of Agriculture, Makurdi, Benue State, Nigeria
  • 2Department of Physics, College of Science, University of Agriculture, Makurdi, Benue State, Nigeria
  • 3Department of Physics, College of Science, University of Agriculture, Makurdi, Benue State, Nigeria

Res. J. Physical Sci., Volume 9, Issue (1), Pages 1-8, February,4 (2021)

Abstract

Absorption of radiation by black surfaces and silvery surfaces was carried out using several material samples of black and silvery surfaces/liquids. An investigation of our material samples using temperature sensors reveals that sharp increase in radiation are more pronounced on black surfaces/liquids than that of silvery surfaces/liquids. The geometrical configuration was greatly altered as the power radiated from rear surfaces were measured by sensors as different material samples are taken into account with respect to time. We investigated theoretically that for an evacuated container, the thermal energy transfer is solely due to radiation as the vacuum is kept between two spheres while for a non-evacuated container, an extra heat transfer occurs due to the airs thermal conductance if the spheres separation contains air. The temperature distribution in presence of heat sources was calculated and the results are in good agreement with the experimental results. The results of rate of absorption of radiation by the black surfaces and silvery surfaces for different material samples were compared. These results reveal that black surfaces absorb radiation at greater rate as compared to silvery surfaces with respect to time. We recommend that other colors apart from black and silvery be used or added as material samples in further research work.

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