Flow Phenomenon of Nano-Fluid and Development of Micro-Pump with the Aid of Pettier Element and Shape Memory Alloy

1)Peltier元件和形状记忆合金的动态特性本文所用的Peltier元件是在外加直流电流的作用下加热的。加热的Peltier元件使形状记忆合金膨胀。同时，当不对Peltier元件施加直流电时，形状记忆合金保持原始形状，因为Peltier元件没有被加热。请注意，它恢复到原来的形状是缓慢的，因为加热的形状记忆合金的壁温需要相当长的时间才能恢复到原来的形状。因此，为了改善恢复原始形状所需的时间，需要向Peltier元件施加相反的电流。这是因为加热的Peltier元件被冷却，导致形状记忆合金的实质冷却。这种冷却使恢复自然恢复到原来的形状。规则的运动给出以下结果：(A)在…中，热电偶在帕尔蒂埃元件的两侧连接直流电流过的越多。通过规则地改变其流动方向，测量了壁温的时间变化。(B)Peltier单元的单侧壁面与形状记忆合金接触后，形状记忆合金的形状变化随Peltier单元的规则温度变化而规律变化。2)微型泵的制造(A)所制造的微型泵由扩散阀、带有Peltier元件和形状记忆合金的热电活性元件和喷嘴阀组成。这些零件是在铝板上制造的，每个零件的深度为1 mm。纳米流体和纯流体在扩散阀、热电活性元件和喷嘴阀中的流动。为了显示微泵中的流体流动，制造的铝板上覆盖着聚四氟乙烯玻璃。(B)重要的是要考虑通道壁的亲水特性。它的性质影响着流体在微细窄通道中的流动现象。较少

1) Dynamic characteristics of Peltier Element and Shape Memory AlloyA peltier element employed here was heated by the imposed direct current. The heating peltier element makes the shape memory alloy expand. Meanwhile, when the direct current is not imposed to the peltier element, the shape memory alloy maintains the original shape, because the peltier element is not heated. Note that it is slow to return to the original shape, because the wall temperature of the heated shape memory alloy needs a substantial time to the original one of it. Therefore, in order to improve the time consumed to return the original shape, the opposite current needs to be imposed to the peltier element. This is because the heated peltier element is cooled, resulting in a substantial cooling of the shape memory alloy. This cooling induces the recovery nature to return the original shape. The regular motion gives the following results :(a) The thermocouples are connected at both sides of the peltier element, in … More which the direct-electric current flows. By regularly changing its flow direction, the time wise variation of the wall temperature was measured.(b) After the one-side wall of the peltier element is contacted with the shape memory alloy, the shape variation of the shape memory alloy is regularly changed with a regular temperature variation of the peltier element. Its responsibility is experimentally measured.2) Manufacture of micro pump(a) The manufactured micro pump consists of diffuser valve, thermal-electric active element with peltier element and shape memory alloy, and nozzle valve. These parts are manufactured in the aluminum plate in which the depth of each part is 1mm. The nano-fluid and pure-fluid flow in the diffuser valve, thermal-electric active element, and nozzle valve. In order to visualize the fluid flow in the micro-pump, the aluminum plate manufactured is covered by the PYREX glass.(b) It is important to consider hydrophilic characteristics of the channel wall. Its nature affects the fluid flow phenomena in the micro and narrow channel. Less