臺灣博碩士論文加值系統

微通道沸騰熱傳是個有趣的工業應用與基礎研究課題且其現象與傳統尺度的通道有很大的差異。本研究採用除氣後的去離子水為工作流體，探討其在平行梯型矽質微通道內的流動沸騰。測試段利用微機電技術製作，於單晶片上蝕刻三或六條為通道，水力直徑分別為41.3和33.5μm。本研究的目的為探索多平行矽質微通道的沸騰熱傳與雙相流現象，包括氣泡成長機制、沸騰熱傳、雙相流動形態與雙相流不穩定現象。
透過高速攝影機可清楚地觀察到微通道內的流動型態，包含氣泡流、彈狀流、環狀流、逆向蒸氣流、乾化以及其他特殊的流動型態。本研究發現氣泡成長與時間大致呈現線性關係，而彈狀流氣泡成長則與時間成指數關係。雙相時的熱傳能力較單相佳，當微通道內產生雙相現象時，進口壓力會有振盪行為，其振盪振幅受到熱通率與質量通率的影響。

Flow boiling heat transfer in microchannels is of significant interest and it is for industrial applications and fundamental researches. This study investigates experimentally flow boiling of degassed, de-ionized water in multi-parallel, silicon based trapezoid microchannels, including three and six parallel microchannels that having hydraulic diameter of 41.3 and 33.5μm. The tested chips are fabricated by MEMS technology. The objective of this research is to explore the boiling heat transfer and two-phase flow in microchannels including bubble growth mechanism, boiling heat transfer, two-phase flow pattern and instability.

By employing a high-speed video-camera, bubbly flow, slug flow, annular flow, reversal vapor flow, dry out and other peculiar two-phase flow patterns are observed clearly in microchannels. The bubble grows rate is almost linearly by time and the bubble in slug flow grows exponentially with time. The heat transfer ability of two phase flow is prior to single phase flow. The fluctuation of inlet pressure is observed during two phase period and it depends on heat flux and mass flux.

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