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flow rate ( m& ), ⎧ ⎫ ⎪⎛ g ⎞ v2 v2 ⎪ ⎛ − ⎞ − ⎪⎪ W& = m& w = m& ⎨⎜⎜ ⎟⎟( z1 − z2 ) + ⎜⎜ 1 v v p p 2 ⎟⎟ + 1 2 + u1 − u2 + q{ 12 ⎬ ⎪⎝ g c ⎠ ⎝1422 gc