Abstract
When nonreflected intense visible radiation of about 4 x 10 exp 6 J/(sq m-sec) is incident on a dense vegetative layer (about 3-kg/sq m loading, 0.3-m height) for even a second or two, the absorbing leafy matter can be desiccated and gasified. Simple unsteady 1D models are formulated and solved to characterize the rate of propagation earthward of the pyrolysis front, at which the vegetative population under consideration totally disappears. Distinct treatments are undertaken for temperate-cereal-like layers which contain only foliage (hay, wheat, grass) and brush-like layers, in which not only effectively pyrolyzable leafy matter but also partially pyrolyzable woody-stem matter exist. Qualitative remarks consider soot formation in the pyrolyzate and/or combustion of the hydrocarbon-vapor pyrolyzate with interstitial air. 7 refs.
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