A blend of ethylene glycol (C2H6O2) and water (50%:50%, v/v) was used as imSix piezoelectric transducers were evenly
attached to the bottom of the stainless steel freezer cavity (30 cm 24 cm 25 cm) through which a continuous flow
(1 L min1) of coolant was maintained by a low temperature circulation pumpmersion fluid/coolant