【摘要】 以电沉积方法制备了孔隙率相同的5种不同孔径的泡沫铜,采用统计的方法测得孔径尺寸并通过扫描电子显微镜(SEM)对其结构与形貌进行观察,在PBR-1型渗透性测定仪上测定单向稳态气流通过泡沫铜时产生的压降,计算材料的渗透性能参数及其与孔径间的关系。研究结果表明,在实验流速范围内,流体通过泡沫铜产生压差随流速的变化遵循Forchheimer定律,即压差随流速的增大而增大,与流速呈二次方关系,流动状态属于层流—紊流转捩区,即有局部紊流存在的层流态。实验测算出了5种不同孔径d泡沫铜的渗透性能参数(渗透率K1、惯性系数K2及形状系数f),分析了各参数随孔径d改变的变化趋势,确定孔径与渗透性能间关系的有关参量,获得电沉积泡沫铜在层流-紊流转捩区的孔径-渗透性经验方程,对电沉积泡沫铜的设计、制备及在相关应用领域的应用具有实际意义。更多还原

【Abstract】 Copper foams with same porosity but different pore sizes were prepared by electrodeposition method,pore structures were observed and pore sizes were calculated by Scanning Electronic Microscope(SEM),steady-state unidirectional pressure-drops to changing velocity of air flow were measured by PBR-1 permeability tester,permeability characters of the samples were determined.The results showed that in the experimental flow velocity range,the relationship between pressure-drops and flowing velocities followed Forchheimer equation,which means the flow state belong to transition state between static flow and turbulent flow.The permeability characters as the permeability K1,inertia coefficient K2 and form coefficient f for 5 types of copper foam was deduced,the effect of pore size d on the permeability characters were analyzed,the empirical equation between the pore size and permeability of electrodeposited copper foam in transition state between static flow and turbulent flow was set up.更多还原