The hydrodynamic cavitation generated through an orifice plate is used to decompose aqueous solution of KI in this work.By measuring the concentration of the iodine liberated in reaction

it was found that the decomposition reactions of the aqueous solution of KI could be induced by hydrodynamic cavitation.The effects of hydrodynamic conditions

geometric characteristics of the orifice plate and the concentration of solution on the decomposition of the aqueous solution of KI were experimentally examined and theoretically analyzed.It was concluded that some chemical reactions could be induced or enhanced by hydrodynamic cavitation

and the intensity acting on chemical reaction by hydrodynamic cavitation was decided by the cavitation conditions

the amount of free radicals and the concentration of reactants. It is important to optimize the hydrodynamic cavitiation conditions for the enhancement of chemical reactions.