臺灣大學: 機械工程學研究所馬小康鄭博澤Cheng, Po-TsePo-TseCheng2013-04-012018-06-282013-04-012018-06-282012http://ntur.lib.ntu.edu.tw//handle/246246/255755本研究參考Pratsinis合成陶瓷粉末的相關研究，提出合成TiO2的反應途徑作並建立單分散顆粒模型(Monodisperse Particle Formation Model, MPF Model)，再以Kruis等人提出的顆粒動力學模型推導顆粒運動方程式進行後續模擬二氧化鈦在甲烷火焰中燃燒合成的情況。模型中考慮了熱流場、化學反應、布朗運動、燒結作用、顆粒間的凡德瓦力等影響。本研究建立之單分散顆粒(MPF)模型中考慮了熱流場、化學反應、布朗運動、燒結作用、顆粒間的凡德瓦力等影響，針對氣相燃燒合成法，在假設產物為單分散的情形下，以聚集塊之數量密度N、單位質量氣體中的顆粒總體積V和總表面積A描述產物粒徑的成長過程，來預測燃燒合成顆粒之粒徑大小。此外，也將模型應用至TTIP在甲烷預混火焰中合成TiO2的實驗結果分析，其中包括探討顆粒的特性(顆粒數量密度、顆粒總體積、顆粒總表面積)受到環境的影響，將燃燒室區域分成前驅物氣化區、顆粒生成區、顆粒過飽和區、顆粒聚集、凝合區及停止生成區做討論，可探討在不同氧氮比、總流量、和前驅物濃度的情形下對顆粒粒徑的影響。在收集高度為2.5cm處的粒徑由40.9nm上升至54.2nm，當氧氮比(O2/N2)由20/80變為50/50。In this study , a TiO2 Monodisperse Particle Formation model(MPF Model) which describes the chemical reaction process of every reactions in combustion synthesis of TiO2 has been built based on the Pratsinis study in the synthesis of ceramic powders. The particle dynamics equations to simulate the synthetic of TiO2 in the methane flame are derived according to Kruis model about the characteristics of aggregate particles. In this TiO2 MPF Model, chemical reaction, Brownian motion, sintering, Van der Waal interaction and diffusion had been considered and the spread of particles and aggregates are assumed to be monodisperse. The particle size and growth in the synthesis process are described by the number concentration of particles (N), total particle volume per mass (V) and total particle surface area per mass (A). Finally, the TiO2 combustion synthesis process is classified into five regions as the precursor vaporization zone、the particle formation zone、the particle collision zone、the coagulation and aggregation zone and the completed production zone on the basis of particles characteristic(N、V and A).When fixed the collection height as 2.5cm, the particle size (dp) increased from 40.9nm to 54.2nm as O2/N2 increased from 20/80 to 50/50.140 bytestext/htmlen-US氣相燃燒合成法顆粒動力學顆粒預測gas-phase combustion synthesisparticle kineticsparticles predictionthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/255755/1/index.html