國立臺灣大學應用力學研究所翁宗賢2006-07-262018-06-292006-07-262018-06-292004-07-31http://ntur.lib.ntu.edu.tw//handle/246246/21707本文利用熱氣泡噴墨印頭結合FPGA （Field Programmable Gate Array）晶片產 生調控式陣列精微噴霧，以低速風洞產生 強制空氣流場，分別以定頻及變頻兩種噴 霧方式對加熱平板進行噴霧冷卻實驗，並 藉由資料擷取控制系統紀錄平板之瞬時溫 度變化，進而推算出對流熱傳係數。 定頻噴霧冷卻是將霧滴以固定之頻率 噴射至發熱平板，藉以觀察噴霧冷卻前、 後熱傳對流係數之變化，結果顯示噴霧後 可提高對流熱傳係數1.2 至2.9 倍。變頻噴 霧冷卻是判斷資料擷取控制系統量測之平 板溫度後，送出相應之變頻控制訊號，而 隨著平板溫度變化產生變頻噴射霧滴，結 果顯示噴霧後可提高對流熱傳係數1.9 至 2.3 倍。Mist cooling of two heated areas was studied under natural and forced convection. Array of water droplets was generated by a thermal bubble jet printer head. Transient temperatures were recorded by a data acquisition system to deduce heat transfer coefficients. Water droplets discharged vertically at various heights in natural convection. Results indicate that mist cooling can enhance heat transfer rate 1.4 to 6.8 times over pure natural convection. Forced convection was tested in a low-speed, mini wind tunnel. Mist cooling increases heat transfer coefficient by 1.28 to 11.7 times.application/pdf292470 bytesapplication/pdfzh-TW國立臺灣大學應用力學研究所霧粒冷卻流場顯影噴流霧 化蒸發冷卻精微流力mist coolingflow visualizationdroplet formationvaporizationmicro fluid mechanicsreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/21707/1/922212E002046.pdf