  There are many applications of multiphase flow in important fields such as
biological, chemical and power processes. Bubble coalescence is of a
significant importance in simulating multiphase fluid flows. Weber number
($W_e$), Reynolds number (Re) and collision parameter play important role in
the coalescence of bubbles. In the present work, front-tracking method is
applied to simulate bubble coalescence. Moreover, the results are presented for
different collision parameters and changes in the coalescence of bubbles are
discussed
