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نظرية الرمل مطحنة طحن
Theoretical models of turbulent flow in rolling motion. 201081 The momentum equation of turbulent flow in a tube in rolling motion can be written as (2-1) ∂ u ∂ t = − 1 ρ ∂ p ∂ x + υ ( ∂ 2 u ∂ r 2 + 1 r ∂ u ∂ r) − ∂ u ′ v ′ ¯ ∂ r − F a
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