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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10566


    Title: 膜片式均質機各摻水率下物理特性分析
    Physical Tests and Analysis for Water‐In‐Oil Emulsions with Different Water Contents Prepared by Ultrasonic Method
    Authors: 侯順雄
    Contributor: 圖書資訊館
    Date: 2009-11-30
    Issue Date: 2010-06-11 15:07:56 (UTC+8)
    Abstract: 本研究針對膜片式均質機各摻水率下的乳化燃料進行物理特性分析,內
    容包括光學顯微鏡觀察分散相水滴平均粒徑度及分散度、乳化燃油隨溫度變
    化的黏度變化情況、以及水滴維持分散相的時間。研究中完成的摻水率計有
    7%、14%、21%和28%。結果得到14%摻水率的乳化燃油,其(內層)分散相
    水滴平均粒徑度最小(約2.8 ~ 3.75 μm)且分散度最均勻;28%摻水率的乳化
    燃油,其(內層)分散相水滴平均粒徑度最大(約4.4 ~ 6.4 μm)且分散度最差。
    一般而言,3 小時製作時間的各摻水率乳化燃油,其(內層)分散相水滴平均粒
    徑度較小,且分散度較佳。
    在常溫下,乳化燃油靜置一個月仍無法由肉眼清楚觀察到分離的現象,
    可見膜片式均質機製作的乳化燃料,其分散相和連續相不易分離。在高溫下
    (80 和90℃)觀察發現有極少量的分散相水滴在試管底端管壁上出現(即有類
    似分離的現象發生),但其數量不易定量化;且隨溫度升高或時間增長,分散
    相水滴在試管底端管壁上出現的量也略微增加,但分散相分離與溫度和時間
    的關係仍不易定量化。經由離心機測試,經過10 分鐘的測試後,即發現沿
    著離心力方向(試管外壁)有灰色物質出現,隨著時間增加,其數量亦增加,
    推測其應為分散相水的分離。此外,亦檢測乳化燃油之上層和下層的含水
    量,可幫助判別是否有分離的現象。經由測試發現上層和下層含水量之差
    異,隨著摻水率的增加有增加的趨勢。
    黏度的檢測分析發現乳化燃油之黏度隨著摻水率的增加而增加,且黏度
    隨著溫度的增加而降低。不同摻水率之黏度差異會隨著溫度的增加而降低。
    A major portion of the energy produced in the world today comes from burning liquid
    hydrocarbon fuels in the form of droplets.Now days a huge portion of energy that is produced in the world comes from burning hydrocarbon fuels [1]. Increase the efficiency of this process is imperative due to the higher cost of the hydrocarbon fuels in the market. One method to increase the thermal performance and reduce the environmental impact of burning these fuels is the emulsification with water in order to form water in oil emulsions. An interesting phenomenon of micro‐explosions occurs when the emulsion are burned. These micro‐explosions occur because the water has a lower boiling point than the oil; and when the water in liquid phase is exposed to the burning conditions at high temperature and high pressure, the water droplet increases suddenly its volume about 1000 times its original value . This phenomenon causes the fragmentation of the emulsion to produce smaller oil droplets and to improve the burning efficiency. By burning emulsions, fuel saving and reduction on NOx, CO and other emissions can be achieved . In this report the details and results of 4 physical test carried out for 12 different emulsions are summarized. The first test had the intention to determinate the relationship between the size of the water droplets with the preparation time and the water content. The second test had the intention to measure the stability of the emulsion at different conditions, like time, hot temperature and centrifugal force. The third test had the intention to determinate the water content in the upper and lower layer of the emulsion. The fourth test had the intention to measure the viscosity and to determinate how the viscosity changes with the water content and the preparation time. In the final part of this report we summarized some conclusions obtained by analyzing the results of every experiment.
    Appears in Collections:[機械工程系所] 研究計畫

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