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“Power Law” modelJednačine za određivanje kritične brzine- u cevima (bušaćim i teškim šipkama):vk⎡= 0,01⋅⎢⎣( 3.470 −1.370⋅n)1,27⋅ρis⋅ K ⎤⎥⎦12−n⋅⎛⎜⎝3⋅n+ 1 ⎞⎟0,0492⋅ID ⋅n⎠n2−n( m / s) LLLL ( 64)-u međuprostoru kanal bušotine-cevi:vk⎡= 0,01⋅⎢⎣( 3.470 −1.370⋅n)2,05⋅ρis⋅ K ⎤⎥⎦12−n⎛ 2⋅n+ 1⋅⎜⎝ 0,0252⋅d( D − OD)⎞n⎟⋅ ⎠n2−n( m / s) LLLL ( 65)66

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