Upstream Fluid Flow Effects in Aluminium DC Casting

2002 ◽  
Vol 396-402 ◽  
pp. 65-70 ◽  
Author(s):  
Jan Zuidema Jr. ◽  
Laurens Katgerman
Keyword(s):  
Fluid Flow ◽  
Dc Casting ◽  
Flow Effects

Local and global fluid-flow effects on dipole flexural waves

Geophysics ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. D1-D11
Author(s):  
Elliot J. H. Dahl ◽  
Kyle T. Spikes
Keyword(s):  
Fluid Flow ◽  
Low Frequency ◽  
Summation Method ◽  
Sensitivity Analyses ◽  
Flexural Wave ◽  
Biot Theory ◽  
S Wave ◽  
Local Flow ◽  
Flow Effects ◽  
Wave Induced

Wave-induced fluid flow (WIFF) can significantly alter the effective formation velocities and cause increasing waveform dispersion and attenuation. We have used modified frame moduli from the theory of Chapman together with the classic Biot theory to improve the understanding of local- and global-flow effects on dipole flexural wave modes in boreholes. We investigate slow and fast formations with and without compliant pores, which induce local flow. The discrete wavenumber summation method generates the waveforms, which are then processed with the weighted spectral semblance method to compare with the solution of the period equation. We find compliant pores to decrease the resulting effective formation P- and S-wave velocities, that in turn decrease the low-frequency velocity limit of the flexural wave. Furthermore, depending on the frequency at which the local-flow dispersion occurs, different S-wave velocity predictions from the flexural wave become possible. This issue is investigated through changing the local-flow critical frequency. Sensitivity analyses of the flexural-wave phase velocity to small changes in WIFF parameters indicate the modeling to be mostly sensitive to compliant pores in slow and fast formations.

Transcritical CO2 heat pump systems: exergy analysis including heat transfer and fluid flow effects

2005 ◽  
Vol 46 (13-14) ◽  
pp. 2053-2067 ◽  
Author(s):  
J. Sarkar ◽  
Souvik Bhattacharyya ◽  
M. Ram Gopal
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Flow Effects

Frequency sweeping and fluid flow effects on particle trajectories in ultrasonic standing waves

2008 ◽  
Vol 123 (5) ◽  
pp. 3406-3406
Author(s):  
Bart Lipkens ◽  
Jason Dionne ◽  
Michael Costolo ◽  
Edward Rietman
Keyword(s):  
Fluid Flow ◽  
Standing Waves ◽  
Particle Trajectories ◽  
Flow Effects ◽  
Frequency Sweeping

scholarly journals Thermal Modelling of Fluid Flow Effects In Thin-Dipping Aquifers

1993 ◽  
Vol 112 (2) ◽  
pp. 276-289 ◽  
Author(s):  
G. Vasseur ◽  
L. Demongodin ◽  
A. Bonneville
Keyword(s):  
Fluid Flow ◽  
Thermal Modelling ◽  
Flow Effects

Fluid Flow Effects in Evaporation From Liquid–Vapor Meniscus

1996 ◽  
Vol 118 (3) ◽  
pp. 725-730 ◽  
Author(s):  
D. Khrustalev ◽  
A. Faghri
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Momentum Conservation ◽  
Heat Fluxes ◽  
Heated Wall ◽  
Liquid Phases ◽  
Evaporative Heat Transfer ◽  
Flow Effects ◽  
Energy Equations ◽  
Liquid Vapor

A mathematical model of the evaporating liquid–vapor meniscus in a capillary slot has been developed. The model includes two-dimensional steady-state momentum conservation and energy equations for both the vapor and liquid phases, and incorporates the existing simplified one-dimensional model of the evaporating microfilm. The numerical results, obtained for water, demonstrate the importance of accounting for the fluid flow in calculating the effective evaporative heat transfer coefficient and the superheat of the vapor over the liquid–vapor meniscus due to the heat transfer from the heated wall. With higher heat fluxes, a recirculation zone appears in the vapor near the heated wall due to extensive evaporation in the thin-film region of the liquid–vapor meniscus.

Effect of fluid flow on freezing and thawing of saturated porous media

1978 ◽  
Vol 364 (1716) ◽  
pp. 45-73 ◽  
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Seepage Flow ◽  
Saturated Porous Media ◽  
Ground Water Flow ◽  
Freezing And Thawing ◽  
Variable Theory ◽  
Complex Variable Theory ◽  
Protection Devices ◽  
Flow Effects

In this paper we obtain an analytical solution that describes the effect of seepage flow on the freezing and thawing of saturated porous media. This solution is obtained by using techniques from complex variable theory. Results are presented to show how fluid flow effects the shape and growth rates of frozen regions embedded in the porous media. The effect of a heat sink is included for both single and multiple frozen regions. Examples are presented to illustrate the effect of this ground water flow on the thawing of arctic permafrost with and without the presence of perma­frost protection devices.

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