### LAMINAR FLOW IN CONCENTRIC ANNULUS WITH A MOVING …

An analytical solution and a numerical analysis are presented to study the flow behavior in concentric annulus with moving core in pipe for laminar flow condition. The analytical analysis is presented as exact solution for steady, fully developed and one dimensional flow. The numerical model is presented to study two-dimensional, steady, developing and fully developed flows. …

Đọc thêm### Heat transfer with laminar flow in a concentric annulus with prescribed ...

An analysis has been performed to determine the heat transfer charac-teristics for laminar forced-convection flow in a concentric annulus with prescribed surface temperatures. The temperatures of the inside and outside walls of the annulus are considered to be different. The temperature distri-butions were determined by utilizing the method of superposition. By way of …

Đọc thêm### Axial laminar flow of viscoplastic fluids in a concentric annulus ...

Axial laminar flow in an annular geometry (flow in the annular space of two concentric cylinders, Fig. 1) is encountered in many industries including flow of polymeric melts or suspensions in extrusion flows to generate tubular extrudates and in oil and gas exploration, where various viscoplastic fluids are injected under pressure for drilling and oil bore cementing.

Đọc thêm### Laminar Flow: Flow in a Circular, in Varying Diameter, Parallel …

Laminar Incompressible Flow in a Pipe of Varying Diameter: Consider sections 1-1 and 2-2 of a pipe whose diameter varies uniformly from D 1 at section 1-1 to D 2 at section 2-2. Let the sections be l apart. The pipe conveys a liquid of viscosity μ. Let the pressure intensities at these sections be p 1 and p 2.

Đọc thêm### CiteSeerX — Search Results — two-layer annulus

We describe a remote sensing method for measuring the internal interface height field in a rotating, two-layer annulus laboratory experiment. The method is non-invasive, avoiding the possibility of an interaction between the flow and the measurement device. The height fields retrieved are accurate

Đọc thêm### LAMINAR FLOW IN AN ANNULUS WITH POROUS WALLS

The U.S. Department of Energy's Office of Scientific and Technical Information

Đọc thêm### Effect of laminar chaos on reaction and dispersion in eccentric annular …

The circumstance considered is that of laminar axial 'Poiseuille' flow in the annular region between the two non-concentric cylinders, accompanied by a secondary, generally chaotic, flow induced via alternate rotation of the cylinders.

Đọc thêm### Laminar and Turbulent Friction Factors for Annular Flow of …

Summary. The challenge of theoretical and numerical studies of annular fluid flow with varying eccentricity is mainly a result of the required coordinate systems. Computational-fluid-dynamics (CFD) modeling provides the state-of-the-art approach of investigating fluid flow in such complex geometries. In this study, results from a series of numerical simulations for the fully …

Đọc thêm### What is Laminar Flow – Viscous Flow – Definition

Laminar vs. Turbulent Flow. Laminar Flow: Re < 2000 'low' velocity; Fluid particles move in straight lines; Layers of water flow over one another at different speeds with virtually no mixing between layers.; The flow velocity profile for laminar flow in circular pipes is parabolic in shape, with a maximum flow in the center of the pipe and a minimum flow at the …

Đọc thêm### Laminar Flow in an Annulus GIVEN A viscous liquid ( ρ = 1.18 x …

Laminar Flow in an Annulus . GIVEN A viscous liquid left(rho=1.18 times 10^{3} kg / m ^{3} ; mu=right. 0.0045 N . left. s / m ^{2}right)) flows at a rate of 12 ml/s through a horizontal, 4-mm-diameter tube. FIND (a) Determine the pressure drop along a l-m length of the tube which is far from the tube entrance so that the only component of velocity is parallel to the tube axis.

Đọc thêm### Laminar entrance flow in curved annular ducts | Semantic Scholar

Laminar entrance flow in curved annular ducts @article{Hoon1992LaminarEF, title={Laminar entrance flow in curved annular ducts}, author={Ki Hoon and Seung-O Park}, journal={International Journal of Heat and Fluid Flow}, year={1992}, volume={13}, pages={41 …

Đọc thêm### Flow Through Annulus Calculator Excel Spreadsheet

P is the wetted perimeter in ft (m for S.I. units) For a flow through annulus calculator: A = (π/4) (Do2 – Di2) P = π (Do + Di) Where D o is the inside diameter of the outer pipe and D. i. is the outside diameter of the inner pipe. …

Đọc thêm### Generally laminar flow occurs in the annulus while

Generally, laminar flow occurs in the annulus, while turbulent flow occurs in the drill string. Turbulent flow is generally avoided in the annulus since it may cause washouts in the formation by erosion. 6.3 Graphical Method for Optimization of Hydraulics Programme Given that the power and pressure limitations of the system the geometry of the circulating system and the fluid …

Đọc thêm### Laminar fluid flow and heat transfer in an annulus …

laminar and turbulent flows. Effects of the external enhancement on laminar flow and heat transfer in a double-pipe heat exchanger were studied numerically by Prata and Sparrow (1984). Periodic enhancement on the inner tube of the annulus offered a good compromise between increases in the pressure drop and the heat transfer. At a

Đọc thêm### Laminar Flow - Drilling Fluids - Rig Worker

Figure 1 demonstrates laminar flow in an annulus. Generally, laminar flow is the preferred annulus flow profile because it results in less pressure loss and reduces hole erosion. To achieve effi cient cuttings transport in laminar flow, the fluid rheology should be tailored to give a flat velocity profile, with a small "n" value for power-law ...

Đọc thêmWe investigate the local self-sustained process underlying spiral turbulence in counter-rotating Taylor-Couette flow using a periodic annular domain, shaped as a parallelogram, tw

Đọc thêm### laminar flow in an annulus - Pipelines, Piping and Fluid …

RE: laminar flow in an annulus. 2. zdas04 (Mechanical) 24 Sep 10 23:43. I've found that the "hydraulic area" or "wetted perimiter" methods understate observed pressure drop in a full pipe (they seem to work well in horizontal flow of a liquid if the annulus is not full). For mostly vertical flow or flow with the annulus full (either turbulent ...

Đọc thêm### Laminar-turbulent flow in a spherical annulus - NASA/ADS

Experimental results are presented regarding the nature of the flow of a viscous incompressible fluid contained between two concentric spherical surfaces that rotate at different angular velocities. Depending upon the various parameters involved (the radius ratio, the angular velocity ratio, and the Reynolds number), the resulting flow in the spherical annulus may be laminar, …

Đọc thêm### Average velocity flow between parallel plates

The steady-state continuity Since a is the charge per unit area, a = QlA, then the field between the plates is E = ~~ e0A The relation between electric field and electric potential, as given by Eq PARALLEL FLOW OVER FLAT PLATES Laminar and turbulent regions of the boundary layer during flow over a flat plate A solution is obtained by perturbing the creeping-flow.

Đọc thêm### Investigation of laminar, fully developed flow in annulus by …

Herein, secondary flow effects were introduced into the model, but simplification was achieved by using laminar flow. The governing equations describing steady laminar flow in an annulus with one or two rotating screens were solved by the finite difference method. The resulting algorithm was checked against published results.

Đọc thêm### Solved Consider fully developed laminar flow in the …

Consider fully developed laminar flow in the annulus between two concentric pipes. The outer pipe is stationary, and the inner pipe moves in the x direction with speed V. Assume the axial pressure gradient is zero ( ∂p/∂x = 0). (a) …

Đọc thêm### What is laminar flow? - Mobile Hydraulic Tips

Laminar flow describes this ease of flow, and it describes how the desire of a fluid to travel is parallel straight lines, whenever possible. When fluid is prevented from this streamline flow, it experiences turbulence. Turbulence is …

Đọc thêm### Heat transfer in laminar flow in a concentric annulus with …

A theoretical investigation of heat transfer in fully-developed laminar flow in an annulus with peripherally varying heat flux has been carried out. The calculation involves the superposition of the solutions for an axisymmetric heat flux and a perturbation heat flux both of which are constant axially.

Đọc thêm### What is the value of Nusselt number in laminar flow?

In a laminar flow along an Annular cross section with heating in one side and insulation in the other, what is the value of the Nusselt number in this flow? and is the diameter in the Nusselt expression Nu=h*D/k the hydraulic diameter? fluid …

Đọc thêm### Axial laminar flow in an eccentric annulus: An approximate solution

Axial laminar flow in an eccentric annulus: An approximate solution. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. By using our site, you agree to our collection of information through the use of cookies. ... Numerical Solution of Power-law Fluid Flow through Eccentric Annular Geometry. By Noaman ...

Đọc thêm### 5 Laminar Internal Flow

5 Laminar Internal Flow 5.1 Governing Equations These notes will cover the general topic of heat transfer to a laminar °ow of °uid that is moving through an enclosed channel. This channel can take the form of a simple circular pipe, or more complicated geometries such as a rectangular duct or an annulus.

Đọc thêm### Fluid velocity profile development for turbulent flow in smooth …

Fluid velocity profile development for turbulent flow in smooth annuli Fluid velocity profile development for turbulent flow in smooth annuli. Download File. r_6602970.pdf (3.13 MB) Date. 1965. Authors. Okiishi, Theodore. Journal Title. Journal …

Đọc thêm### Solved 4. The velocity profile for laminar flow in an | Chegg.com

4. The velocity profile for laminar flow in an annulus is given below. Here Δp/L=-10 kPa/m is the pressure gradient, μ is the viscosity, and Ro-5 mm and Ri 1 mm are the outer and inner radii. Find the volume flow rate, the average velocity, and the maximum velocity. Plot the velocity distribution r) In ; Question: 4. The velocity profile for ...

Đọc thêm### Laminar flow in an annulus between two concentric rotating …

An analysis is presented for the steady laminar flow of an incompressible Newtonian fluid in an annulus between two concentric porous spheres with injection/suction at their boundaries. The inner sphere rotates with constant angular velocity about its …

Đọc thêm### Prediction of laminar and turbulent flow heat transfer in annular …

Theses and Dissertations. Prediction of laminar and turbulent flow heat transfer in annular passages. Prediction of laminar and turbulent flow heat transfer in annular passages. Download. File. r_7907263.pdf (4.42 MB) Date. 1978. Authors.

Đọc thêm### Fluid friction - PetroWiki

The laminar flow regime prevails at low flow velocities. Flow is orderly, and the pressure-velocity relationship is a function of the viscous properties of the fluid. ... The laminar flow equations for annular flow are approximate for Newtonian and power-law flow in annuli with low-clearance but reasonably accurate and much simpler than the ...

Đọc thêm### Laminar Flat Plate - GitHub Pages

The flow solution can be visualized in ParaView (.vtk) or Tecplot (.dat for ASCII). Results. Results are given here for the SU2 solution of laminar flow over the flat plate. The results show excellent agreement with the closed-form Blasius solution. Figure (2): Mach contours for the laminar flat plate.

Đọc thêm### A New Model for Laminar, Transitional, and Turbulent Flow of …

This new diameter accounts for both annular geometry and the effects of a non-Newtonian fluid. It provides the link between Newtonian pipe flow and non-Newtonian flow through concentric annuli. The method is valid in any flow regime and can be used to determine whether a non-Newtonian flow is laminar, transitional, or turbulent.

Đọc thêm### A Generic Model for Calculation of Frictional Losses in Pipe …

tures in laminar, helical flow, where the inner wall in the annulus rotates. At low shear rates, they also observed "gelling" of the fluid under steady state conditions. Under the actual laminar shear thinning conditions, they found that the pressure drop decays with increasing drill-string rotation. Their prediction methodology

Đọc thêm### Laminar, transitional and turbulent flow of Herschel--Bulkley …

More specifically, experimental data for laminar flow in concentric annulus, presented by Fordham et al. (1991), Okafor and Evers (1992) and Hansen et al. (1999) will be used for laminar flow. Similarly, controlled field data provided by Langlinais et al. (1983) will be used to cover all three flow regime types, laminar, transitional and ...

Đọc thêm### 36 Laminar flow in a concentric annulus - Bingham Plastic

Estimate the pressure gradient required to maintain a steady flow of 0.3 m3/min of this polymer solution through the annulus between a 10 mm and a 20 mm diameter tube. Solution 10 3 oR = — x 10-3 = 0.005 m From Table 3.2, for o = 0.5 and n = 0.5, k = 0.728 Substituting these values in equation (3.82) 0.3 (0.5) (3.14) (0.01)3 /-Ap 2 / 0.01 2

Đọc thêm