Abstract: Based on the Euler-Lagrange method coupled with DPM (discrete phase models)-WFM (wall film models),a new model was established to investigate the heat and mass transfer characteristics of spray water-humid air and spray water-tube wall among staggered tube bundlesand to design the movement of spray water among staggered tube bundles and the heat/mass transfer process.Firstly,the reliability of the model was verified according to the literature experimental data,showing only 1.1% maximum error.Secondly,the influence of operating parameters was analyzed for heat and mass transfer performance of humid air-wateramong staggered tube bundles.The results show that the influence of air flow rate on heat and mass transfer performance among staggered tube bundles is more significant than that of spray water flow.Therefore,the spray water flow rate can be appropriately reduced to improve the energy efficiency of circulating water pump.The increase of dry bulb temperature and wet bulb temperature will have a negative effect on the heat and mass transfer performance among staggered tube bundles.However,the effect of wet bulb temperature on heat and mass transfer performance among staggered tube bundles is greater than that of dry bulb temperature.Increasing the spray water temperature can improve the Nusselt number between spray water and tube wall,but the average temperature of tube bundle wall also increases,which means that the performance of the cooling-water machine is reduced.The above research results can provide a basis for the thermal design and calculation of staggered tube bundles.