A new concept of the compound heat transfer augmentation by flow-induced vibration was put forward in steam-water heat exchangers. The vibration of heat transfer surface can increase the heat transfer coefficient.In the meantime

the vibration of the tubes can also remove the fouling adhered to the tube surface easily

and therefore

the fouling thermal resistance can be decreased. Experiments were carried out on the vibration and heat transfer characteristics of the elastic tube bundles used in steam-water heat exchanger. Experimental results showed that the tube bundles vibrated mainly at its lower natural frequencies in crossflow

whereas

for the in-tube flow

they vibrated randomly at a wide range of frequencies. Experiments of heat transfer characteristics revealed that the convective heat transfer coefficient of the outside tube was greatly raised while that of the inside tube rose slightly. Generally

the outside average convective heat transfer coefficient for the elastic tube bundles is five times that of the fixed tube bundles at the same Re .The mechanism of reduction of fouling thermal resistance has been analyzed.