  Coalescence event in pendant and sessile drop is distinguished by the
formation and evolution of the liquid bridge created upon singular contact. The
bridge radius, $R$, is known to evolve as $R\sim t^b$, with power-law exponent,
$b$, signifying the dominant governing forces. In this work, we experimentally
explore the phenomenon in sub-classes of complex fluids namely, colloidal and
non-colloidal suspensions that have particle hydrodynamic interactions as
origin of viscoelasticity. Our observations suggest that such fluids have flow
dependent thinning response with finite elasticity in shear flows but
negligible in extensional flows. Based on these, the study extends the
Newtonian universality of $b=0.5$ to these thinning fluids. Further we fortify
these observations through a theoretical model developed by employing
Ostwald-de Waele constitutive law. Finally, we utilize this theoretical model
to inspect the existence of arrested coalescence in generalized Newtonian
fluids.
