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    Title: 聚二甲基矽氧烷混合銅粉之震盪式熱管研製
    Other Titles: Fabrication of polydimethylsiloxane mixing with copper powder pulsating heat pipe
    Authors: 鄭博軒;Cheng, Po-hsuan
    Contributors: 淡江大學機械與機電工程學系碩士班
    康尚文;Kang, Shung-wen
    Keywords: 震盪式熱管;聚二甲基矽氧烷;銅粉;翻模;充填率;Pulsating Heat Pipes;PDMS;Copper Powder;Turn Over the Mold;Filled Ratio
    Date: 2008
    Issue Date: 2010-01-11 06:29:28 (UTC+8)
    Abstract: 本研究是利用聚二甲基矽氧烷(Polydimethylsiloxane, PDMS)與銅粉為材質,製作出一可視化之震盪式熱管(Pulsating Heat Pipe, PHP),震盪式熱管之長、寬及流道內徑分別為56mm、50mm及2mm、總長為580mm。蒸發端和冷凝端的部分置入銅塊作為加熱及冷卻的導體,以增加熱傳導速率,並被包覆於PDMS與銅粉的混合結構,完成真空處理,在固定填充率(60%)及不同輸入功率下(3W、4W、5W、6W、7W、8W)測試其效能,此外,利用攝影機拍攝其作動情形。
    實驗結果顯示,以甲醇為工作流體,垂直擺放時,當輸入功率達到8W,可發現流體之震盪頻率跟隨著輸入功率而增加,熱阻值也隨之降低至7.7℃/W。此外,達到平衡狀態的時間也跟隨著輸入功率的增加而提前。
    藉由攝影機拍攝流道內作動的情形,發現隨著輸入功率的增加,流場的型態也隨之改變,從一開始的細泡流場,逐漸轉變為彈狀型流場,最後再形成連續彈狀型流場。而汽-液柱之長度也有增加之趨勢。
    This paper reports on using polydimethylsiloxane (PDMS) and copper powder to manufacture a visual pulsating heat pipe (PHP) with a length of 56mm, a width of 50mm, an internal diameter of 2mm, and total length of 580mm. Evaporator and condenser were put into copper blocks as the media for heating and heat dissipation. In order to increase the speed of heat conduction, PDMS mixed with copper powder in these two sections and finishing making the vacuum management. According to the fix filled ratio (60%) and different heating power (3W, 4W, 5W, 6W, 7W, 8W) to test the efficiency of the Polydimethylsiloxane mixing with Copper Powder (PCP) PHP.
    When the working fluid is methanol, and the PHP is in a vertical orientation, increasing the heating power, then the PHP is working. When the heating power reaches 8 watts and the PHP will work obviously. So we can get the lowest thermal resistance of 7.7℃/W.
    A video camera was used to record the fluid pulsating motion inside the PHP. Different heating powers were employed to observe the working situation, flow direction of the vapor plug, liquid slug and the structure form of the flow. We can find the change from minute bubble flow into slug bubble flow and change into continuous slug bubble flow. When PHP is putting higher heat flux, vapor plug and liquid slug will become longer.
    Appears in Collections:[機械與機電工程學系暨研究所] 學位論文

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