2018
DOI: 10.17122/ngdelo-2018-5-73-80
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Balanced Heat Exchange of Oil Pipeline in Permafrost Calculation and Thawing Halo Radius Determination

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“…In practice, for the calculation of hydraulic resistance under isothermal modes of pipelines, the Colebrooke formula [14][15][16][17][18][19][20] and VNIIgas formula [21] are used most often. The Darcy-Weisbach formula or the Leibenson formula family are used for calculation of pressure losses under the same conditions [6].…”
Section: Literature Review and Problem Statementmentioning
confidence: 99%
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“…In practice, for the calculation of hydraulic resistance under isothermal modes of pipelines, the Colebrooke formula [14][15][16][17][18][19][20] and VNIIgas formula [21] are used most often. The Darcy-Weisbach formula or the Leibenson formula family are used for calculation of pressure losses under the same conditions [6].…”
Section: Literature Review and Problem Statementmentioning
confidence: 99%
“…Under non-isothermal operation modes, the modified formulas of Leibenson of the form of λ=A/Re m , where А and m are the empiric coefficients [20], are used in practice to calculate hydraulic resistance of a pipeline. According to data from [22], A=0.11(68+∆Re) 0, 25 ; m=(1-560D/(∆Re).…”
Section: Literature Review and Problem Statementmentioning
confidence: 99%