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Bingham-ov plastični modelJednačine za određivanje kritične brzine- u cevima (bušaćim i teškim šipkama):vk=1,0499ID ⋅ ρis⋅( )22μ + μ + 0,2281⋅ID ⋅τ⋅ ρ ( m / s) LLL( 62)pp0is- u međuprostoru kanal bušotine - cevi:vk= 1,28692⋅ ⎜⎛μ + + 0,1242 ⋅0⋅ ⎝⎠spμpdisρ( D − OD)dis2( D − OD) ⋅τ⋅ ρ ⎟⎞( m / ) ⋅⋅⋅⋅⋅⋅⋅⋅⋅(63)65
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