NUMERICAL AND EXPERIMENTAL INVESTIGATION OF MICROCHIP ENCAPSULATION

A numerical simulation of moving boundaries in a two-dimensional, iner tia-free, incompressible flow with shear-thinning viscosity is present ed. A control-volume approach with fixed finite-element mesh is used f or predicting the fluid-front advancement. The experimental results fo r nine different configurations of upper-and lower-cavity thickness in a flow domain similar to the mold cavity used for microchip encapsula tion are reported. The predicted fluid-front advancement and pressure are found to be in good agreement with the corresponding experimental measurements. The difference in pressure on two sides of the paddle is used to develop an analytical model for predicting the paddle shift d uring microchip encapsulation.