  We show a novel way of generating electrohydrodynamic motion inside a droplet
under AC electrowetting. Using a very low applied voltage (10<V) strong
electrothermal motion can be generated in the droplet. Alternating current
electrothermal (ACET) actuation originates due to imposed Joule heating into
the fluid body via applied electric field. A parametric study based on
operating parameters and geometrical parameter is conducted experimentally and
numerically. With the operating ranges of parameters, high fluid velocity of
the order of mm/s can be generated inside the droplet. Further improvement in
fluid motion can be anticipated through optimization technique. The
investigations revealed in the analysis can be used as useful tool in the
design of efficient drop-based micromixer.
