Flow Reynolds Number - an overview | ScienceDirect Topics
Dipak K. Sarkar, in Thermal Power Plant, 2017 4.6 Operating Procedure. The key to effective flushing of a fuel oil system is to maintain turbulent oil flow (Reynolds number > 4000) through each circuit as long as the process continues.Turbulent oil flow can be attained by adopting relatively high fluid velocity and/or lowering fluid viscosity.
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Reynolds Number Calculator - eFunda
This calculator computes the Reynolds Number given the flow characteristics asked for below. It outputs the flow type you can expect (laminar, transitional, or turbulent) based on the Reynolds Number result.Think of the Characteristic Distance as the distance from the leading edge (where the fluid first makes contact) for flow over a plate, or as the pipe diameter for flow inside a pipe.
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Measurement of Laminar Oscillatory Flow in the Inlet ...
Measurement of Laminar Oscillatory Flow in the Inlet Length of a Circular Tube ... of 0.04 units/ml (threshold at which aggregation just occurred) and 0.02 units/ml, and the 14C-activity in the ...
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Laminar oscillatory flow of Maxwell and Oldroyd-B fluids ...
The effect of the Womersley parameter α on the velocity profiles was studied in more detail by Hale et al. , and an estimate of the limit of stability of the laminar oscillatory flow was provided in terms of an ‘effective Reynolds number’ (the Reynolds number of a steady flow with the same maximum rate of shear) that was found to depend ...
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Womersley number - Wikipedia
It can also be written in terms of the dimensionless Reynolds number (Re) and Strouhal number (St): = /. The Womersley number arises in the solution of the linearized Navier–Stokes equations for oscillatory flow (presumed to be laminar and incompressible) in a tube. It expresses the ratio of the transient or oscillatory inertia force to the shear force.
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(PDF) Oscillatory flow: A technology ready to deliver
Oscillatory flow: A technology ready to deliver ... and ensuring similar values for the oscillatory and net flow Reynolds numbers. Following this protocol should ensure an optimal design, with a ...
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Fluid Mechanics Experiments in Oscillatory Flow VolumeII ...
Fluid Mechanics Experiments in Oscillatory Flow VolumeII-TabulatedData J. Seume, G. Friedman, and T.W. Simon ... Red _ Urnn d Reynolds number for steady flow, based on the duct diameter ... Symbol Units Explanation s m Streamwisedistance measured from open end of duct, or the stroke
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Viscometer - Wikipedia
Note that Stokes flow is assumed, so the Reynolds number must be small. A limiting factor on the validity of this result is the roughness of the sphere being used. A modification of the straight falling-sphere viscometer is a rolling-ball viscometer, which times a ball rolling down …
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Reynolds number - Rice University
The Reynolds number is an important parameter in Transport Phenomena. It is used extensively in many calculations dealing with fluid flow, mass transfer and heat transfer. It is the ratio of the inertial forces to the viscous forces and depends on a characteristic length, velocity, density and viscosity of the fluid. Low Reynolds numbers imply ...
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Reynolds Number: Definition & Equation - Video & Lesson ...
Turbulent flow can cause vibrations, which can cause premature wear in a system leading to failure. Let's focus now on the details surrounding the Reynolds number, which tells us if flow is ...
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Fluid Flow and Heat Transfer in Serpentine Channels at Low ...
Fluid Flow and Heat Transfer in Serpentine Channels at Low Reynolds Numbers ... affected by the channel geometry and less dependent on the Reynolds number. Forced oscillatory flow in wavy channels was recently studied by Nishimura [8] for ... of 1.3 units between the top and bottom walls. This
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Stokes' Law, Reynolds Number, and Measuring Liquid Viscosity
3/27/2014 · Stokes’ Law will suffice as a sufficient model if the flow is smooth and non-turbulent. We can determine this smoothness by calculating Reynolds number: where Re is Reynolds number, is the fluid density, V is the characteristic velocity, d is the characteristic flow length, and is the fluid viscosity.
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Determining the Critical Condition for Flow Transition in ...
stability analysis of a plane Poiseuille flow gives a critical Reynolds number Re (=ρu0 h/μ) of 5772, while experiments show that transition to turbulence occurs at the Reynolds number of order 1000 (Schmid and Henningson, 2000; Drazin and Reid, 2004). For plane Couette flow, the flow is stable for all Re from linear theory consideration, but the
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Inﬂuence of Torque on the Lift and Drag of a Particle in ...
ﬂuid has a density of ρ0:= 1 in appropriate dimensional units. As in FLR02 and FLR05 the Reynolds number is deﬁned as Re := UD/ν, where the characteristic length-scale D is the particle diameter, and the convective time-scale is D/U. U is the amplitude of oscillation in the far-ﬁeld velocity and ν is the kinematic viscosity.
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Suppression of turbulence in wall-bounded flows by high ...
new orientation and a higher Reynolds number. In this study, we explore the possibility of sustained control of turbulence in wall-bounded flows by spanwise oscillations. The studies are based on direct numerical sim- ulations of a planar turbulent channel flow which has been
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Spatio–temporal analysis of hydrodynamic forces on the ...
A numerical investigation of unsteady hydrodynamic forces on the particle bed in an oscillatory flow environment is performed by means of direct numerical simulations. Statistical descriptions of drag and lift forces for two particle sizes of diameter 372 and 125 in wall units in a …
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Flow around a short horizontal bottom cylinder under ...
3/18/2005 · This paper presents the results of an experimental study on flow around a short cylinder placed horizontally on a solid bottom. The aim was to provide a better understanding of flow past blunt objects immersed in the oceanic wave boundary layer. Both steady and oscillatory flows are considered. In the parameter range studied (Reynolds number Re=300–5300, Keulegan–Carpenter number …
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Lab Project 4a – MATLAB Model of Oscillatory Flow
Lab Project 4a – MATLAB Model of Oscillatory Flow Goals ... of forces, so every term should have units of force. Liquid oscillations between the two upright tubes in our flow system can be described by this ... Reynolds number to the friction factor for turbulent flow through a tube. Because you might
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Oscillatory flow and thermal field measurements at the ...
Present focus is on the flow and thermal fields at the interface between the regenerator matrix and a cooler tubular heat exchanger. Velocity measurements within the plenum between the regenerator and the cooler were taken and similarities with previous measurements of oscillatory flow in a …
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Influence of torque on the lift and drag of a particle in ...
In the work of Fischer et al. (2002, "Forces on Particles in an Oscillatory Boundary Layer," J. Fluid Mech., 468, pp. 327-347, 2005; "Influence of Wall Proximity on the Lift and Drag of a Particle in an Oscillatory Flow," ASME J. Fluids Eng., 127, pp. 583-594) we computed the lift and drag forces on a sphere, subjected to a wall-bounded oscillatory flow.
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Active separation control: An overview of Reynolds and ...
Separation control, by nominally two-dimensional periodic excitation, was studied experimentally by the authors and co-workers at Reynolds numbers ranging from 3 × 10 4 to 4 × 10 7, including compressibility effects.The tests demonstrated that active control using oscillatory flow excitation can effectively delay flow separation from, and reattach separated flow to, aerodynamic surfaces at ...
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