| 摘 要： | For any study of a suspension entering a pore,the knowledge of the force and momentexerted on a solute parficle in an arbitrary position outside the pore is essential.This paperfor the first time presents approximate analytical expressions(in closed form),of all thetwelve force and moment coefficients for a sphere outsied a circular orifice,on the basis of anumber of diserete data computed by Yan et al(1987),These coefficients are then appliedto calculate the trajectory and angular velocity of a spherical particle approaching the poreat zero Reynolds number.The trajectory is in excellent agreement with the availableexpermental results.An analysis of the relative importance of the coefficients shows thatthe rofation effect cannot be neglected near the pore opening or near the wall and that thelateral force effect must be taken into account in the neighborhood of the edge of the pore etlg"‘!/‘lh(‘pol‘eopening It is due to neglecting these factors that previous theoretical results deviate fromthe exper
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