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Many chondrules are found to be surrounded by a fine grained rim. Supposedly,these rims were acquired from dust accreted to the chondrules in aprotoplanetary disk. In numerical simulations we study the heat transfer inilluminated bare and dust mantled chondrules. The calculations consider thechondrule size, the dust mantle size, and the thermal conductivities of bothcomponents as parameters. We calculate the photophoretic force and compare thenumerical results to analytical approximations. We give an expression toquantify the photophoretic force on a spherical particle in the free molecularregime to better than 2%. We describe the influence of a dust mantle on thephotophoretic strength by an effective thermal conductivity of the core-mantleparticle. The effective thermal conductivity significantly depends on the sizeratio between mantle and chondrule but not on the absolute sizes. It alsostrongly depends on the thermal conductivity of the mantle with minor influenceof the thermal conductivity of the chondrule. The size ratio between rim andchondrule in meteorites is found to vary systematically with overall size byother authors. Based on this, our calculations show that a photophoretic sizesorting can occur for dust mantled chondrules in optically thin disks or at theevolving inner edge of the solar nebula.

Thermal and Photophoretic Properties of Dust Mantled Chondrules and Sorting in the Solar Nebula