沟槽式平板铝热管设计与性能分析

基于相变传热原理的微热管在高效太阳能利用热控制方面具有良好应用空间。针对太阳能平板集热器的热控制需求,在沟槽式平板铝热管的设计过程中,综合分析了工质、管壳材料、管芯结构和充液率等因素对性能的影响;并搭建试验平台对制造的沟槽式平板铝热管进行性能测试。得出以下结论:不凝性气体对热管传热性能有较大的影响,应加强热管防漏措施;制作过程应该严格控制清洗、充装、封接等工序以确保质量;适当的充液量有助于提高热管等温性能。

人体工学分区按摩座椅分析研究

随着电脑使用普及率的提高,电脑在学习生活中所占用的时间比例越来越大,很多人每天需要长时间与电脑接触,身体长期保持简单而重复的坐姿,对背部肌肉和颈部肌肉的影响非常大,会影响人体血液循环,破坏人体消化系统运作、打乱人体新陈代谢,还会威胁骨骼健康。此次设计椅的头枕、肘部托板位置均可调节,靠背完全按照人体脊椎形状所设计,并采用记忆金属制成,按照人体工学将弹簧座椅进行独立分区,非通电状态即可实现人体接触区的轻型按摩,通电状态可通过调节控制面板实现独立分区的不同强度按摩,能让使用者在休息时更加的舒适、放松,消除了因长期使用传统电脑座椅给人体带来的疲劳和随之而来的身体伤害。该座椅适用于任何人群,外观优美,实用性较强。

Fabrication and thermal performance of grooved-sintered wick heat pipe

Some novel grooved-sintered composite wick heat pipes(GSHP) were developed for the electronic device cooling.The grooved-sintered wicks of GSHP were fabricated by the processes of oil-filled high-speed spin forming and solid state sintering.The wick could be divided into two parts for liquid capillary pumping flow:groove sintered zone and uniform sintered zone.Both of the thermal resistance network model and the maximum heat transfer capability model of GSHP were built.Compared with the theoretical values,the heat transfer limit and thermal resistance of GSHP were measured from three aspects:copper powder size,wick thickness and number of micro grooves.The results show that the wick thickness has the greatest effect on the thermal resistance of GSHP while the copper powder size has the most important influence on the heat transfer limit.Given certain copper powder size and wick thickness,the thermal resistance of GSHP can be the lowest when micro-groove number is about 55.

均匀放电的混合平板荧光灯

本文介绍了一种用于液晶电视的新型背光源。Xe，Ne和Hg蒸气是通过平行的通道放电的，绝缘的玻璃通道之间可渗透的气体通道，使气体的压力保持相等，从而保证了放电的均匀，这种灯的设计亮度为12000cd／m2，可以实现高亮度、长寿命和规模化生产。