THE EFFECT OF FREE CONVECTION ON PLUG FORMATION DURING CRYOGENIC PIPE-FREEZING : A NUMERICAL STUDY

1994 ◽  
Author(s):  
A.C. Keary ◽  
R. J. Bowen
Keyword(s):  
Free Convection ◽  
Numerical Study ◽  
Plug Formation

Pin-Fin Heat Sink With Horizontal Base and Blocked Edges

2008 ◽  
Author(s):  
D. Sahray ◽  
H. Shmueli ◽  
N. Segal ◽  
G. Ziskind ◽  
R. Letan
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Contact Resistance ◽  
Cross Section ◽  
Heat Input ◽  
Heat Sink ◽  
Numerical Study ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Pin Fin

In the present work, horizontal-base pin fin heat sinks exposed to free convection in air are studied. They are made of aluminum, and there is no contact resistance between the base and the fins. For the same base dimensions the fin height and pitch vary. The fins have a constant square cross-section. The edges of the sink are blocked: the surrounding insulation is flush with the fin tips. The effect of fin height and pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks and their environment are modeled using the Fluent 6 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed for various fin heights. Also assessed are effects of the blocked edges as compared to the previously studied cases where the sink edges were exposed to the surroundings.

scholarly journals Dissipation Effect On A Free Convection Flow Past A Porous Vertical Plate

1970 ◽  
Vol 6 (1) ◽  
pp. 52-59
Author(s):  
Amena Ferdousi ◽  
MA Alim
Keyword(s):  
Free Convection ◽  
Vertical Plate ◽  
Numerical Study ◽  
Porous Plate ◽  
Convection Flow ◽  
Free Convection Flow ◽  
Box Scheme ◽  
Flow Through ◽  
Implicit Finite Difference ◽  
Boundary Equations

A Numerical study on the effect of dissipation on a steady free convection flow through a porous vertical plate is made. The relevant non-leaner boundary equations are made dimensionless using specific non-dimensional variables. The corresponding non-similar partial differential equations are solved using implicit finite difference method with Keller-Box scheme. The results are then presented graphically and discussed thereafter. Keywords: porous plate; viscous dissipation; natural convection. DOI: http://dx.doi.org/10.3329/diujst.v6i1.9334 DIUJST 2011; 6(1): 52-59

Numerical study on debonding failure of cement plug/formation interface in open-hole temporary abandoned wells

2020 ◽  
Vol 34 (22) ◽  
pp. 2405-2423
Author(s):  
Jiwei Jiang ◽  
Jun Li ◽  
Gonghui Liu ◽  
Hongwei Yang ◽  
Wai Li ◽  
...  
Keyword(s):  
Numerical Study ◽  
Open Hole ◽  
Abandoned Wells ◽  
Plug Formation ◽  
Cement Plug

Free Convection in a Vertical Duct: Numerical Study

2011 ◽  
Vol 42 (6) ◽  
pp. 539-555
Author(s):  
F. Z. Bakhti ◽  
Mohamed Si-Ameur ◽  
A. M. Chehhat
Keyword(s):  
Free Convection ◽  
Numerical Study ◽  
Vertical Duct

Numerical Study of Free Convection in a Doubly Stratified Non-Darcy Porous Medium Using Spectral Quasilinearization Method

2015 ◽  
Vol 16 (3-4) ◽  
pp. 173-183 ◽  
Author(s):  
D. Srinivasacharya ◽  
Sandile S. Motsa ◽  
O. Surender
Keyword(s):  
Porous Medium ◽  
Free Convection ◽  
Numerical Study ◽  
Saturated Porous Medium ◽  
Nonlinear Partial Differential Equations ◽  
Darcy Number ◽  
Skin Friction Coefficient ◽  
Linearization Method ◽  
Convection Boundary Layer ◽  
Local Skin

AbstractFree convection boundary layer flow past a semi-infinite vertical plate in a doubly stratified fluid-saturated porous medium in the presence of constant suction/injection is analyzed. The flow in the porous medium is described by the Brinkman–Forchheimer-based model. A suitable coordinate transformation is introduced, and the obtained system of non-similar, coupled and nonlinear partial differential equations is solved numerically using the spectral quasi-linearization method. The effects of buoyancy parameter, Darcy number, Forchheimer parameter, suction/injection parameter, thermal and solutal stratification parameters on the dimensionless velocity, temperature and concentration are presented graphically. Further, the local skin friction coefficient, heat and mass transfer rates are presented graphically.

scholarly journals The Numerical Study of Channel Flow in Turbulent Free Convection with Radiation and Blowing

2014 ◽  
Vol 3 (2) ◽  
pp. 11-26 ◽  
Author(s):  
Siamak Hosseinzadeh ◽  
Ali Yari ◽  
Ehsan Abbasi ◽  
Faezeh Absalan
Keyword(s):  
Free Convection ◽  
Channel Flow ◽  
Numerical Study

A Numerical Study of Developing Free Convection Between Isothermal Vertical Plates

1991 ◽  
Vol 113 (3) ◽  
pp. 620-626 ◽  
Author(s):  
D. Naylor ◽  
J. M. Floryan ◽  
J. D. Tarasuk
Keyword(s):  
Free Convection ◽  
Numerical Study ◽  
Navier Stokes ◽  
Elliptic Solution ◽  
Inlet Flow ◽  
Number Range ◽  
Aspect Ratios ◽  
Cast Doubt ◽  
Elliptic Solutions ◽  
Energy Equations

Steady two-dimensional laminar free convection between isothermal vertical plates including entrance flow effects has been numerically investigated. The full elliptic forms of the Navier-Stokes and energy equations are solved using novel inlet flow boundary conditions. Results are presented for Prandtl number Pr = 0.7, Grashof number range 50 ≤ Grb ≤ 5×104, and channel aspect ratios of L/b = 10, 17, 24. New phenomena, such as inlet flow separation, have been observed. The results cast doubt on the validity of previous elliptic solutions. Comparisons with the approximate boundary-layer results show that a full elliptic solution is necessary to get accurate local quantities near the channel entrance.

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