I would like to express my greatest gratitude to my supervisor, Prof. Keiya Nishida, who grants me the opportunity to study in his laboratory and provides me with kind guidance and tutorship not only in the scientific research but also in the everyday life. It is impossible for me to achieve this accomplishment within the three years without his patient and thoughtful instruction. I also would like to thank the associate Prof. Yoichi Ogata in our laboratory, his kind instruction especially his

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... xperience in numerical simulation facilitates our research. I express my special compliment to China Scholarship Council (CSC), a non-profit institution affiliated with the Ministry of Education of China, who sponsors me the living expense in Japan. The China General Consulate in Osaka gives us the immediate response and suggestion as soon as we have need. I am indebted to my predecessors and colleagues in our laboratory who are committed to the research in the spray and combustion field. Dr. Seoksu Moon, Dr. Wu Zhang, Dr. Jiangping Tian and Dr. Olawole Abiola Kuti give me their precious experience and kind assistance any time. Mr. Ogawa, Mr. Egashira, Mr. Uemura and many other master students join in my group and we cooperate all the time. Meanwhile, I never forget the kind help and instruction from the staff of students supporting office of faculty of engineering and service room of department of mechanical engineering. At last, my deepest gratitude is sent to my family. My wife and I married during my doctor course study period, her firm support, encouragement and love is the most important source for my career. I also never forget the great love from my parents in all my life. My best wishes and love will be given to my baby, who will be born in October. The fetal movement brought us the happiness when I composed this dissertation, my Ph.D diploma will be his/her first present.