Numerical predictions of sand erosion in a choke valve

Saeid, Nawaf H.

doi:10.15282/jmes.12.4.2018.01.0347

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…The differences between the inlet and outlet heat fluxes and momentum fluxes in the converged solution are calculated and found within  10 -3 % in all simulation cases in the present study. Similar solution strategy is used successfully in the previous studies in the references [22][23][24].…”

Section: Numerical Schemementioning

confidence: 96%

Transient cooling of two circular cylinders arranged in Tandem an bounded by an adiabatic wall

Saeid

Hasan

Ya'akob

et al. 2021

JMES

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Parametric study is carried out on the transient cooling process of two circular cylinders in tandem arrangement for a specified period of time. Transient analysis of conjugate (conduction and convection) heat dissipation from two identical cylinders is considered with various parameters. The two cylinders of same size and properties are bounded by an adiabatic flat wall from below and the cooling air is flowing normal to their axis (cross flow). The following parameters are investigated in the present study: Reynolds number, cylinders thermal properties, separation distance between the two cylinders and the cooling time. The laminar flow is considered with Reynolds number values from 50 to 500. The simulations are carried out for cooling the two cylinders made of carbon steels, plastics plexiglass and plywood. The local and average Nusselt number for both steady and transient cooling of the two cylinders are presented. The effects of the parameters are investigated and the results are presented to understand the process. It is found that increasing either the separation distance and/or the Reynolds number will increase the heat dissipation and reduce the cooling time. The results show that carbon steels cylinders need longer time of cooling compare with the plywood cylinders due to the difference in their thermal inertia.

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Section: Numerical Schemementioning

confidence: 96%

Transient cooling of two circular cylinders arranged in Tandem an bounded by an adiabatic wall

Saeid

Hasan

Ya'akob

et al. 2021

JMES

View full text Add to dashboard Cite

show abstract

“…The numerical method used in the present study is based on the algorithm SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) of Patankar and Spalding [24].The system of the algebraic equations is solved iteratively by using the line by line procedure in conjunction with the tri-diagonal matrix algorithm (TDMA). This iterative solution needs under relaxation to control the changes in the values of all the variables during iteration [25,26].…”

Section: Procedures Of Solutionmentioning

confidence: 99%

Thermal study of fluid flow inside an annular pipe filled with porous media under local thermal non-equilibrium condition

Bouaffane

Talbi

2019

JMES

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The present work involves the thermal numerical simulation of fluid flow inside an annular pipe completely filled porous material. The mathematical model of the energy transport is based on the Local Thermal Non-Equilibrium (LTNE) between the fluid and the solid phases. The governing equations are discretized by the finite volume method. SIMPLE algorithm has been used to solve the set of algebraic discretized coupled equations. This work is divided in two parts. In the first part, the effect of the pertinent dimensionless parameters which govern the study such as Biot number (Bi), solid-fluid thermal conductivity ratio (Rc) and radius ratio (Rr) on the LTNE intensity are analyzed by calculating: the local difference of temperature (LDT), the maximum of the local difference of temperature (LDTmax) and the average of LDT. The results show that the increase of Biot number and the solid-fluid thermal conductivity ratio, and the decrease of radius ratio reduce the LTNE intensity. The intensity of the LTNE in the developing region is greater than that of the fully developed region. In the second part, the convection heat transfer enhancement is studied, the results illustrate that the increase of Biot number and the solid-fluid thermal conductivity ratio, and the decrease of radius ratio represent good factors to ameliorate the rate of the convection heat transfer between the fluid and the inner wall.

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“…If the volume of flow is F = 0, the cell is filled with air and if F = 1, the cell is filled with water. Also, cells with values of 0 < F <1 are cells that contain some water and some air (F is mass flux) [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of airfoil distance to water surface on static stall

Azargoon

Djavareshkian

Esmaeilifar

2020

JMES

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In this study, viscous, turbulent, and steady flow around an airfoil near the water surface has been simulated through a numerical method. In this simulation, Navier-Stokes equations have been solved using the finite volume method with a discretized second-order accuracy and PIMPLE algorithm. The Volume of Fraction (VOF) method has been employed to predict the free surface flow. A part of the simulation results has been validated through numerical and experimental data. Besides considering the style of flow separation in the angles of numerous attacks and airfoil static stall near the surface of the water. For this purpose, the airfoil simulation has been processed airfoil in the 68,000 Reynolds number, angle of attack of 2.5 to 11 degree and different distances from the water surface ( h/c = 0.5, 1, ). In a larger angle of attacks, flow is initially separated from the leading edge of the surface, and then it attaches to the surface at a lower point. This reattachment leads to an increase in adverse pressure gradient and the formation of a larger separation in the downstream of the airfoil. The pressure gradient dramatically increases, and the flow gets separated from the upstream of the airfoil. Upon lowering distance from the surface, static stall takes place at a higher point and a lower angle of attack, respectively.

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Numerical predictions of sand erosion in a choke valve

Cited by 10 publications

References 16 publications

Transient cooling of two circular cylinders arranged in Tandem an bounded by an adiabatic wall

Transient cooling of two circular cylinders arranged in Tandem an bounded by an adiabatic wall

Thermal study of fluid flow inside an annular pipe filled with porous media under local thermal non-equilibrium condition

Effect of airfoil distance to water surface on static stall

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