A solid-phase sintering process for the low-cost fabrication of composite micro-channels was developed. Three kinds of composite micro-channels with metallic porous structures were designed. The sintering process was studied and optimized to obtain porous-structured micro-channels with high porosity. The flow resistance and heat transfer performance in the composite micro-channels were investigated. The composite micro-channels show acceptable flow resistance, significant enhancement of heat transfer and dramatic improvement of flow boiling stability, which indicates a promising prospect for the application in forced convective heat transfer.
为克服传统超声探伤系统设计复杂以及电路调试困难等缺点,介绍了一种以Altera公司的Cyclone II FPGA为处理核心的设计方案。利用NIOS II软处理内核构建SOPC嵌入式系统,使用IP核技术,结合超声传感器实现探伤系统的软硬件协同设计,灵活高效,有利于缩短设计迭代周期。实验结果表明,该系统能够实现数据实时采集和复杂算法处理,具有体积小、成本低和可靠性高等特点,能够有效分析判断缺陷的位置和特征。