[PDF] Top 20 Numerical Study of Polymer-induced Drag Reduction in Turbulent Pipe Flow

... to study the effects of viscoelasticity on the transitioning cylinder ...the drag and shedding ...the drag at high polymer ...good flow resistance compared to the previous ...in ... See full document

... a turbulent pipe flow has been measured numerically using FLUENT while turbulence in the pipe flow was modelled using the standard k   model as a result of its robustness in promoting ... See full document

... direct numerical simulations (DNS) of turbulent drag reducing ...and study the effect of various polymer properties (like elasticity, stretching and concentration) on the ...polymeric ... See full document

... this study, a new method has been proposed to reduce the drag in pipe flow by installing energy promoter at the inner wall to change the turbulence structure in the ...to study the ... See full document

... direct numerical simulation (DNS) study of wall oscillation for flow control by Jung et ...channel flow (Baron & Quadrio 1996; Choi et ...2012), pipe flow (Orlandi & ... See full document

... plane turbulent channel flow bounded by porous ...the flow inside the fluid region is tackled via a standard DNS, while a volume averaged approach is employed inside the porous ...total drag ... See full document

... the turbulent drag reduction characterization induced by polymeric ...as drag reducer agents in a pipeline and RDA successfully due to its viscoelastic properties that can suppress the ... See full document

... using polymer concentration of 10 ...straight pipe flow before the bend increased with Reynolds ...lower drag reduction [10], [41]. Analogous to flow before the bend, drag ... See full document

... a turbulent streamwise velocity profile in pipe flow destabilises the turbulence so that the flow ...laminar pipe flow profiles in the sense that the nonlinear stability of the ... See full document

... the drag reduction has a wavelength of half of the oscillation ...the drag reduction is independent of the direction of wall motion and is only related to the change in velocity at the ...the ... See full document

... friction drag. Consequently, drag reduction studies are an important focus of turbulent ...a turbulent flow based on a trigger event) and passive (modification of boundaries such ... See full document

... studies, polymer coatings were employed for drag ...soluble polymer coating on surfaces of underwater ...of drag reduction ...of drag reduction was dependent on ... See full document

... in turbulent flow conditions, polymer DRAs can be added to reduce the flow ...the polymer should have high molecular weight, which is the second condition necessary for the drag- ... See full document

... Controlling turbulent flow artificially was believed to be extremely difficult several decades ago, until the discovery of turbulent coherent structures and improved understanding of the underlying ... See full document

... rect numerical simulations. In this study, the effects of the amplitude and the phase of wall blowing and suction control input were considered ...friction drag reduction. By changing the ... See full document

... plasma induced flow became steady, thus the plasma body force was di- rectly balanced by the convection term and the viscous ...plasma induced wall jet profiles among different ... See full document

... The average energy storage per molecule arising from the entropy reduction produced by the flow of dilute solutions is in general:. where V is the configuration volume.[r] ... See full document

... Figure 2.1 shows the essential features of the cylindrical axi-symmetric turbulent fluid flow, which has been considered in the present study with entries in the duct from both radial and axial ... See full document

... This study was carried out to improve speed skating uniforms through the development of materials to minimize air resistance and proper placement of the developed ...This study also conducted wind tunnel ... See full document

... mean turbulent advection speed c is larger than the speeds of both upstream front (cyan up-triangles) and downstream front (red ...bulk turbulent structures are stationary, both fronts move to the left ... See full document