【摘要】 双流体雾化降温冷却技术是将气体和液体在喷嘴内部直接混合,在高压射流作用下直接雾化,雾化的小液滴气化时带走热量,从而降低工作区域温度。喷雾冷却降温系统广泛应用于养殖、高精度建筑及机械切削加工中刀具的冷却等。影响喷雾降温冷却的关键因素是雾滴粒径和雾滴运动速度。雾滴粒径越小,其总表面积越大,易于蒸发、气化,从而产生良好的降温效果;而雾滴运动速度加快则可以进一步加快工作区域的换热过程。文章利用相位多普勒粒子动态分析仪(PDA)对4种不同喷孔直径的喷嘴进行了较为详细的实验研究,获得了影响雾滴粒径和雾滴运动速度的重要因素,得到了双流体雾化喷嘴工作的最佳压力与孔径组合,为喷雾冷却降温的研究奠定了基础。更多还原

【Abstract】 In the twin-fluid spray cooling,the liquid and gas are directly mixed in nozzle.The liquid is atomized directly under the action of high pressure jet flow.With the evaporating of droplets,the heat is taken away and the temperature drops in the working area.The spray cooling system is widely applied in the breed aquatics,high precision architecture and cutting.The key factor affecting the spray cooling is the droplets size and droplets velocity.The smaller the droplet is,the bigger the total surface area is,which is good for evaporation,thus resulting in a good cooling effect.The increasing of droplets velocity improves the heat exchange process in the working area.The experimental research on 4 kinds of different diameter nozzles by means of particle dynamics analyzer(PDA) was presented.The optimum working conditions of this spray nozzle was obtained.更多还原