Forced convection of non‐Newtonian fluids in porous concentric annuli

Alkam, M. K.; Al‐Nimr, M. A.; Mousa, Z.

doi:10.1108/09615539810226120

Cited by 10 publications

(3 citation statements)

References 17 publications

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“…The heavy oil can be regarded as incompressible fluid and laminar flow in the capillary (Khashan and Al-Nimr, 2005;Alkam et al, 1998); and the tip effect and inertia force could be neglected for the long pipe and stable flow. Therefore, the viscous force equals the pressure differential from the inlet to the outlet.…”

Section: Test Of Heavy Oil Flowing Through Capillarymentioning

confidence: 99%

Flow Characteristics of Heavy Oil through Porous Media

Liu

Wang

Xie

et al. 2011

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Performance of flowing through a capillary and porous media for different kinds of heavy oil at different temperatures have been studied by experiments in this article. It shows that the heavy oil containing asphaltene-colloids displays yield-stress rheology (Bingham fluids). The displacing pressure difference increases linearly with the increase of the flow rate. However, the start flowing pressure is different for different heavy oil samples at different temperatures. The higher the temperature is, the lower pressure the heavy oil needs to flow; and when the temperature is high enough, the start flowing pressure equals zero. The minimum temperature at which the start flowing pressure equals zero is called converting temperature. Also, the more viscous the heavy oil is, the higher the converting temperature will be. An exponential relationship of yield stress and temperatures has been obtained for different kinds of heavy oils by the experiments of heavy oil flowing through a capillary. A logarithmic relationship of converting temperatures and the dead oil mobility at 50 ı C has been obtained for heavy oil through different porous media. When a temperature is lower than the converting temperature, the start flowing pressure gradient decreases as a log tendency with the increase of temperature when different heavy oils are flowing through different porous media. For the existence of the start flowing pressure gradient, the heavy oil production rate is different from that for the Newton fluid and it is adverse to the development of heavy oil reservoirs. The test results are favorable to choose the reasonable temperature for heavy oil transportation running in a pipe or well bore and also determine the temperature limitation for different production rates for a specific well sample. It is also important for improving the development effect efficiently.

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Section: Test Of Heavy Oil Flowing Through Capillarymentioning

confidence: 99%

Flow Characteristics of Heavy Oil through Porous Media

Liu

Wang

Xie

et al. 2011

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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show abstract

“…The presence of the porous medium magnifies the pressure drop which is significantly greater for dilatants fluids. The transient forced convection in a porous annular channel in the presence of a power-law fluid was investigated by Alkam et al [18]. It was shown that increasing permeability or decreasing the index n decreases the Nusselt number and the establishment length, whereas the opposite effect is observed when the Peclet number increases.…”

Section: Introductionmentioning

confidence: 98%

Non-Newtonian fluid flow in plane channels: Heat transfer enhancement using porous blocks

Nebbali

Bouhadef

2011

International Journal of Thermal Sciences

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“…Chen and Hadim (1998) utilized the same flow model and the LTE assumption to numerically solve the hydrodynamically and thermally developing problem without boundary layer approximations. Alkam et al (1998) conducted a similar numerical study for the case of concentric annuli. Local thermal non-equilibrium (LTNE) conditions exist due to many obvious causes, such as the presence of distributed or concentrated heat sources in one phase or the presence of some agency which forces different fluid and solid boundary temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Validation of the Local Thermal Equilibrium Assumption in Forced Convection of Non-Newtonian Fluids through Porous Channels

Khashan

Al‐Nimr

2005

Transp Porous Med

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In this paper, we assess the validity of the local thermal equilibrium assumption in the non-Newtonian forced convection flow through channels filled with porous media. For this purpose, the problem is solved numerically using local thermal non-equilibrium and non-Darcian models. Numerical solutions obtained over broad ranges of representative dimensionless parameters are utilized to map conditions at which the local thermal equilibrium assumption can or cannot be employed. The circumstances of a higher modified Peclet number, a lower modified Biot number, a lower fluid-to-solid thermal conductivity ratio, a lower power-law fluid index, and a lower microscopic and macroscopic frictional flow resistance coefficients, are identified as unfavorable circumstances for the local thermal equilibrium (LTE) condition to hold. Quantitative LTE validity maps that reflect the proportional effect of each parameter as related to others are presented.

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Forced convection of non‐Newtonian fluids in porous concentric annuli

Cited by 10 publications

References 17 publications

Flow Characteristics of Heavy Oil through Porous Media

Flow Characteristics of Heavy Oil through Porous Media

Non-Newtonian fluid flow in plane channels: Heat transfer enhancement using porous blocks

Validation of the Local Thermal Equilibrium Assumption in Forced Convection of Non-Newtonian Fluids through Porous Channels

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