Nozzle flow modeled for rotary drillbit design

Mathematical modeling demonstrates that nozzle distribution on drillbits affects the performance of the drilling fluid flow from the bit. This article is about the internal flow of nozzles on a rotary drillbit.Slurry flow in nozzles on a rotary drillbit is different from flow in static nozzles. Flow formulas can be deduced and analyzed in absolute and relative coordinate systems, on the basis of the first law of thermodynamics, by considering the effects of rotation on fluid flow. The authors show that using a relative coordinate system is better than using an absolute coordinate system while analyzing such a flow field. In addition, the inlet and outlet displacement of a nozzle on a dril...

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