Effect of Polymer Fluid Viscoelastic Properties on the Initiation of Transition From Laminar to Turbulent Flow Regime and the Drag Reduction in the Flow Through Horizontal Pipe

Volume 11: Petroleum Technology ◽

10.1115/omae2020-18098 ◽

2020 ◽

Author(s):

Mehmet Meric Hirpa ◽

Ergun Kuru

Keyword(s):

Turbulent Flow ◽

Drag Reduction ◽

Flow Regime ◽

Shear Viscosity ◽

Viscoelastic Properties ◽

Dynamic Pressure ◽

Flow Loop ◽

Horizontal Pipe ◽

Fluid Elasticity ◽

Turbulent Flow Regime

Abstract This study investigated the flow of viscoelastic fluids through horizontal pipeline mainly focusing on the effect of fluid elasticity on drag reduction and onset of transition to turbulent flow regime. In order to be able to see the sole effect of fluid elasticity (independent from shear viscosity), three non-Newtonian fluids having the same shear viscosity but different viscoelastic properties were tested in the horizontal flow loop. Those fluids were the dilute solutions of partially hydrolysed polyacrylamide (HPAM) and they were prepared by using three polymer grades of HPAM (i.e. 5 × 105, 8 × 106, 20 × 106 g/gmol) in different compositions. Experiments have shown that increasing fluid elasticity resulted in higher drag reduction in pipe flow. Moreover, fluid elasticity affected the onset of turbulent flow and an earlier transition to turbulent flow regime (as compared to water flow) was only observed for the flow of fluid having the highest elastic properties. So, understanding effects of fluid elasticity on flow dynamics might improve the performance of fluids engineered for hole cleaning/cuttings transport in oil and gas well drilling or proppant transport in hydraulic fracturing operations. Also, field efforts to find solutions to problems caused by excessive dynamic pressure losses encountered in drilling horizontal or extended reach wells or in transporting hydrocarbons through pipeline might benefit from the findings of this or further extended research on this subject.

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Flow Through a Finite Packed Bed of Spheres: A Note on the Limit of Applicability of the Forchheimer-Type Equation

Journal of Fluids Engineering ◽

10.1115/1.1637928 ◽

2004 ◽

Vol 126 (1) ◽

pp. 139-143 ◽

Cited By ~ 29

Author(s):

Agne`s Montillet

Keyword(s):

Reynolds Number ◽

Pressure Drop ◽

Turbulent Flow ◽

Flow Regime ◽

Fluid Velocity ◽

Type Equation ◽

Packed Bed ◽

Turbulent Flow Regime ◽

Fully Developed Turbulent Flow ◽

Flow Through

The variation of the pressure drop measured as a function of the fluid velocity through a packed bed of spheres is presented and discussed in the range of particle Reynolds number 30–1500. Based on previous studies, the observed limit of validity of the so-called Forchheimer law may be attributed to the concomitant effects of the finite character of the tested bed and of the transition of flow regime which is marking the beginning of the fully developed turbulent flow regime. The limit of validity of the Forchheimer-type law was formerly noticed by several authors.

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Convective Heat Transfer Characteristics of Low Concentration CuO-Water Nanofluids in the Turbulent Flow Regime Based on an Artificial Intelligence Models

Proceedings of the 15th International Heat Transfer Conference ◽

10.1615/ihtc15.fcv.008461 ◽

2014 ◽

Author(s):

Mehdi Mehrabi ◽

Mohsen Sharifpur ◽

Josua P. Meyer

Keyword(s):

Heat Transfer ◽

Artificial Intelligence ◽

Turbulent Flow ◽

Convective Heat Transfer ◽

Flow Regime ◽

Convective Heat ◽

Heat Transfer Characteristics ◽

Turbulent Flow Regime ◽

Intelligence Models ◽

Artificial Intelligence Models

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Thermal performance analysis of plate fin arrays with hexagonal perforations under turbulent flow regime

10.1063/1.5115847 ◽

2019 ◽

Author(s):

Imtiaz Taimoor ◽

Md Lutfor Rahman ◽

Nazneen Sultana Aankhy ◽

Muzahid Bin Khalid

Keyword(s):

Performance Analysis ◽

Turbulent Flow ◽

Flow Regime ◽

Thermal Performance ◽

Turbulent Flow Regime

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Numerical investigation on the thermohydraulic performance of a shell-and-double concentric tube heat exchanger using nanofluid under the turbulent flow regime

Numerical Heat Transfer Part A Applications ◽

10.1080/10407782.2016.1264736 ◽

2017 ◽

Vol 71 (2) ◽

pp. 215-231 ◽

Cited By ~ 9

Author(s):

S. M. Shahril ◽

G. A. Quadir ◽

N. A. M. Amin ◽

Irfan Anjum Badruddin

Keyword(s):

Heat Exchanger ◽

Turbulent Flow ◽

Numerical Investigation ◽

Flow Regime ◽

Tube Heat Exchanger ◽

Turbulent Flow Regime

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Loss Characteristics of Orifices and Nozzles

Journal of Fluids Engineering ◽

10.1115/1.3448670 ◽

1978 ◽

Vol 100 (3) ◽

pp. 299-307 ◽

Cited By ~ 20

Author(s):

S. H. Alvi ◽

K. Sridharan ◽

N. S. Lakshmana Rao

Keyword(s):

Reynolds Number ◽

Turbulent Flow ◽

Flow Regime ◽

Discharge Coefficient ◽

Critical Reynolds Number ◽

Reynolds Numbers ◽

Center Line ◽

Laminar Regime ◽

Variation Of Parameters ◽

Turbulent Flow Regime

Loss characteristics of sharp-edged orifices, quadrant-edged orifices for varying edge radii, and nozzles are studied for Reynolds numbers less than 10,000 for β ratios from 0.2 to 0.8. The results may be reliably extrapolated to higher Reynolds numbers. Presentation of losses as a percentage of meter pressure differential shows that the flow can be identified into fully laminar regime, critical Reynolds number regime, relaminarization regime, and turbulent flow regime. An integrated picture of variation of parameters such as discharge coefficient, loss coefficient, settling length, pressure recovery length, and center line velocity confirms this classification.

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Investigation of Flow Dynamics Over Transitional-Type Microcavity

Journal of Fluids Engineering ◽

10.1115/1.4039159 ◽

2018 ◽

Vol 140 (7) ◽

Cited By ~ 1

Author(s):

Paulius Vilkinis ◽

Nerijus Pedišius ◽

Mantas Valantinavičius

Keyword(s):

Turbulent Flow ◽

Flow Regime ◽

Recirculation Zone ◽

Transitional Flow ◽

Navier Stokes ◽

Flow Topology ◽

Rans Equations ◽

Recirculation Flow ◽

Turbulent Flow Regime ◽

Transitional Type

Flow over a transitional-type cavity in microchannels is studied using a microparticle image velocimetry system (μPIV) and commercially available computational fluid dynamics (CFD) software in laminar, transitional, and turbulent flow regimes. According to experimental results, in the transitional-type cavity (L/h1 = 10) and under laminar flow in the channel, the recirculation zone behind the backward-facing step stretches linearly with ReDh until the reattachment point reaches the middle of the cavity at xr/L = (0.5 to 0.6). With further increase in ReDh, the forward-facing step lifts the reattaching flow from the bottom of the cavity and stagnant recirculation flow fills the entire space of the cavity. Flow reattachment to the bottom of the cavity is again observed only after transition to the turbulent flow regime in the channel. Reynolds-averaged Navier–Stokes (RANS) equations and large eddy simulation (LES) results revealed changes in vortex topology, with the flow regime changing from laminar to turbulent. During the turbulent flow regime in the recirculation zone, periodically recurring vortex systems are formed. Experimental and computational results have a good qualitative agreement regarding the changes in the flow topology. However, the results of numerical simulations based on RANS equations and the Reynolds-stress-baseline turbulence model (RSM-BSL), show that computed reattachment length values overestimate the experimentally obtained values. The RSM-BSL model underestimates the turbulent kinetic energy intensity, generated by flow separation phenomena, on the stage of transitional flow regime.

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