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宋東華 忠州大學校 1981 한국교통대학교 논문집 Vol.14 No.1
This study was to respected loss coefficient when sur face roughness varied at bell mouth is orifice. Using orifice diameter are 20㎜,15㎜,10㎜,5㎜. Surface roughness in increased from .025㎜, to 5.08㎜. By the result of experimental, loss coefficient decreased when roughness increased. Flow coefficient increased when roughness increased. Maximum flow coefficient was increased 0.95-.098. When roughness was 5.08㎜ down orifice diameter 15㎜.