Segregation of Material with Reference to the Formation of the Terrestrial Planets

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Abstract
The problem of the settling of grains in a gravitational field in the presence of a resisting gas when the grains are assumed to be growing by accretion is investigated by numerical methods. The results show that the time of fall is fairly insensitive to the initial conditions assumed. The rate of evaporation of the resisting gas, caused by the release of energy from the falling grains, is also investigated and found to be considerable.