Study on the Micro-pomp utilizing Rapid Boiling

本研究的目的是探讨利用浸没在液体中的微加热器快速沸腾的新概念的可能性。首先，研究了细丝浸泡在过冷的乙醇中，并在大范围的加热速率下进行脉冲加热的蒸汽产生和崩溃行为。将沸腾模式分为三种类型，并讨论了与这些模式相关的一些特征值。进一步研究了薄膜加热器在极快加热条件下自发成核后的蒸汽生成行为，并对蒸汽生成动力学进行了理论研究。制作了具有不同辐合截面的微型泵，并对其泵送特性进行了测量。系统地研究了过热加热器上沸腾锋的传播现象，提出了过热壁面上沸腾的诱导方法，并进行了试验研究。在此基础上，提出了利用沸腾在加热器上传播的微型水泵系统，并通过实验描述了其基本特征。

The purpose of this study is to examine the possibility of new concepts on the micro-pomp which utilizes rapid boiling from a micro-heater immersed in liquid. At first, vapor generation and collapse behavior on a fine wire immersed in sub-cooled ethyl alcohol and subjected to pulse-wise heating was studied over a wide range of heating rates. The boiling mode was classified into three types and some characteristic values were discussed in relation to the modes. Further, the behaviors of vapor generation succeeding spontaneous nucleation on a film heater subjected to extremely rapid heating were studied and the vapor generation dynamics was studied theoretically. The micro-pomp which had different convergent sections across the heater was made and the pumping characteristics was measured.Propagation phenomenon of the boiling front on a superheated heater were studied systematically and, further, the induction methods of boiling on a superheated wall were proposed and examined. Based on these studies, the micro-pomp system utilizing the propagation of boiling on a heater was proposed and the fundamental feature was described by experiments.