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2 results for “annular”

Formulae (2)

V_a = \frac{24.5 \, Q}{D_h^2 - D_p^2}

Speed of mud returning up the annulus, key to carrying cuttings out.

CTR = 1 - \frac{V_{slip}}{V_a}

Fraction of annular velocity effectively lifting cuttings out of the hole.