摘 要

噴墨印相技術已經被政府列為2008年之國家重點發展工業技術之一，其應用範圍相當廣泛，例如有機發光顯示器、無版印刷電路之應用與汽機車燃油霧化器等。本文旨在建構具微米解析能力之流場觀測系統與微粒影像測速系統，以定性與定量探討商用噴墨印相頭內、外流場之特性。所建構之定性與定量系統先經由熱氣泡式噴墨液柱變化過程與微直管流速度分佈積分流量獲得精度驗證。然後本文針對現今商用壓電式噴墨印表機所驅動之噴流墨柱與墨滴演化過程以定性化觀察與定量化特徵物理量，選擇壓電式噴墨印相技術，因其可噴印對溫度敏感的高分子墨水，而相關流場量測卻未見於公開文獻中。透過電子顯微鏡(SEM)解析商用噴墨印表頭內部微結構，利用半導體與微機電製造方式製作出矩形微直管、微縮管與微擴管微流道，採用微質點影像測速技術對其內部流場進行定性與定量之研究分析。直型微管道部分，透過管流速度分佈積分流量的方式，加以驗證系統的可信度；漸縮/漸擴微流道部分，探討三種不同入口/出口寬度比值與雷諾數變化對管內速度場的影響；並改變工作流體，以比重5﹪PEO高分子粉末與去離子水混合後之高分子溶液，探討管內流場之變化。數值模擬除先提供先期設計之外，其計算結果並與實驗結果相互驗證比對。相信本研究所獲得之實驗數據，以及所歸納出的相關資訊，應能提供未來自行設計與製作微噴墨印表頭之有用參考依據。

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