Mechanics of bubble collapse in binary mixtures with heat and mass transfer has been investigated in this paper. The flow field surrounding a collapsing bubble undergoing buoyancy-driven motion was solved using adaptive finite-difference method. A curvilinear coordinate system is employed to keep track of the changing bubble shape. The moving boundary feature is considered as an integral part of the governing equations. The bubble collapse rate, velocity, temperature and species concentration field, and simulation of the bubble collapsing process have been reported. (C) 2001 Elsevier Science Ltd. All rights reserved.