Abstract
The application of pulsed heating by a laser beam to determine the thermal properties of microparticles is explored. Two problems are analyzed : (i) spatially uniform heating of the surface of an absorbing microsphere, and (ii) non-uniform surface heating based on Mie theory computations of the electromagnetic energy source. A parametric study shows that the spatially uniform heating model is sufficient when the thermal conductivity of the microparticle is sufficiently large or the Biot number is sufficiently low, but a more rigorous model is needed to predict the temperature distribution with the microsphere for lower thermal conductivity materials. The resulting analytical solutions are compared with previously published experiments involving infrared heating of single spherocarb particles and are shown to be in good agreement with time-dependent surface temperature measurements.
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