A schematic diagram of the experimental setup is illustrated in
Fig.1. The ohmic heater unit consisted of an open Pyrex glass T-tube
cylinder of 0.201 m length and 0.051 m inside diameter. Two titanium
electrodes were securely placed at the left and right ends of
the T-tube glass via a pair of spacers as in Fig. 2(a), and were connected
to an alternating current power supply (0e1000 V). The
temperature of the medium was continuously measured by using a
Teflon coated type-T thermocouple (Omega Eng. Inc., Stamford, CT)
and recorded by a data logger (21X, Campbell Scientific, Inc., Utah).