煤烧圆家重点实验宝 In general, consider a particular quantity, for control volume v ()=0x,18 Variation rate of dp along rue of control volume DCp Dt !∞ 「.n(s) D Ddy |+|. SVt 小|+。 v Dt I Lab. of coal combustion Hust vI at ax Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cnNL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn In general, consider a particular quantity, , for control volume V, ( ) ( )   = v t  xi ,t V Variation rate of  along rue of control volume ( ) ( )                 +   = +           = + = + = =  V j j V j j V V V V v V t x V x v Dt D V VDt D V V Dt D V Dt D V Dt D Dt D                