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Employing air as fluid media, hydrodynamics performances in cracking furnace tube with twisted slice were studied, then the flow field (velocity, pressure drop, and resistance loss) of heat transfer enhancement was simulated based on CFX, at last, the effect of twist ratio on flow field was analyzed. The experimental results showed that boundary layer in the tube became thin compared with circular...
We consider some aspects allowing to optimize the designing of ships with the desired propulsion properties and to estimate the tactical and technicoeconomic characteristics. First question concerns a forecasting of characteristics of flow near hull, including one in boundary layer and viscous wakes, and, above all, a data on water resistance in real conditions. Simulation is carried out in the towing...
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