该文主要为研究液体性质以及喷嘴结构对气泡喷嘴雾化特性的影响。实验用浆体包括水和6种高黏度流体。采用相位多普勒粒子分析仪对多种流体进行雾化实验研究。对喷嘴几何结构和操作参数对雾化的影响进行了讨论。雾化液滴沿径向的索特平...该文主要为研究液体性质以及喷嘴结构对气泡喷嘴雾化特性的影响。实验用浆体包括水和6种高黏度流体。采用相位多普勒粒子分析仪对多种流体进行雾化实验研究。对喷嘴几何结构和操作参数对雾化的影响进行了讨论。雾化液滴沿径向的索特平均直径(Sauter mean diameter,SMD)最大值在120μm以内。提高气液比能有效降低雾化液滴SMD。喷嘴出口直径和注气孔直径对水的雾化液滴SMD的影响显著,而改变注气角度和混合室长度对水的雾化液滴SMD影响不大。混合室长度增加后,非牛顿流体的雾化质量有一定下降。黄原胶添加量的提高对雾化液滴SMD有很大影响。在雾化介质为水的情况下,液滴SMD变化范围为60～95μm;雾化高黏度流体时SMD范围为60～120μm。展开更多
It is a key factor to increase heat transfer coefficien t of high viscosity fluid in the shell side for making a high performance cooler.T he heat transfer and flow resistance performance of trapezoid fin tube high vi...It is a key factor to increase heat transfer coefficien t of high viscosity fluid in the shell side for making a high performance cooler.T he heat transfer and flow resistance performance of trapezoid fin tube high visc osity fluid cooler with helical or segmental baffles were studied, and compared with the heat transfer coefficient of low-fin-tube cooler with segmental baffl es. Experimental results indicated that heat transfer film coefficient in the sh ell side of trapezoid fin tube cooler with entire helical baffles was 60% more h igher than that of low-fin-tube cooler with segmental baffles,and pressure dr op was lower by 40%. Heat transfer film coefficient in the shell side of trapezo id fin tube cooler with entire helical baffles was 20% more higher than that of trapezoid-fin tube cooler with segmental baffles, and pressure drop was lower b y 50%.Heat transfer film coefficient in the shell side of trapezoid fin tube coo ler with entire helical baffles was 10% higher than that of trapezoid fin tube c ooler with sectional helical baffles, and pressure drop was lower by 19%.Heat tr ansfer film coefficient in the shell side of trapezoid fin tube cooler with segm ental baffles was 30% more higher than that of low-fin-tube cooler with segmen tal baffles, and pressure drop remained unchanged.展开更多
基金Project(42090023) supported by the National Natural Science Foundation of ChinaProject(2020YFA0710504) supported by the National Key R&D Program of China。
文摘该文主要为研究液体性质以及喷嘴结构对气泡喷嘴雾化特性的影响。实验用浆体包括水和6种高黏度流体。采用相位多普勒粒子分析仪对多种流体进行雾化实验研究。对喷嘴几何结构和操作参数对雾化的影响进行了讨论。雾化液滴沿径向的索特平均直径(Sauter mean diameter,SMD)最大值在120μm以内。提高气液比能有效降低雾化液滴SMD。喷嘴出口直径和注气孔直径对水的雾化液滴SMD的影响显著,而改变注气角度和混合室长度对水的雾化液滴SMD影响不大。混合室长度增加后,非牛顿流体的雾化质量有一定下降。黄原胶添加量的提高对雾化液滴SMD有很大影响。在雾化介质为水的情况下,液滴SMD变化范围为60～95μm;雾化高黏度流体时SMD范围为60～120μm。
文摘It is a key factor to increase heat transfer coefficien t of high viscosity fluid in the shell side for making a high performance cooler.T he heat transfer and flow resistance performance of trapezoid fin tube high visc osity fluid cooler with helical or segmental baffles were studied, and compared with the heat transfer coefficient of low-fin-tube cooler with segmental baffl es. Experimental results indicated that heat transfer film coefficient in the sh ell side of trapezoid fin tube cooler with entire helical baffles was 60% more h igher than that of low-fin-tube cooler with segmental baffles,and pressure dr op was lower by 40%. Heat transfer film coefficient in the shell side of trapezo id fin tube cooler with entire helical baffles was 20% more higher than that of trapezoid-fin tube cooler with segmental baffles, and pressure drop was lower b y 50%.Heat transfer film coefficient in the shell side of trapezoid fin tube coo ler with entire helical baffles was 10% higher than that of trapezoid fin tube c ooler with sectional helical baffles, and pressure drop was lower by 19%.Heat tr ansfer film coefficient in the shell side of trapezoid fin tube cooler with segm ental baffles was 30% more higher than that of low-fin-tube cooler with segmen tal baffles, and pressure drop remained unchanged.
