Linear stability analysis and experimental verification of stratified air–water flow in a horizontal bend

Alwazzan, Amir; Than, Cheok-Fah

doi:10.1016/j.petrol.2005.09.003

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…With the increase of flow space, the strain rate gradually decreases, and the strain rate is the smallest when the cross section is the largest, thus the cyclic reciprocation presents periodic changes. On the one hand, the increase in strain rate is due to the increase in the velocity gradient between the main flow region and the wall region, thus increasing the shearing effect on the solution . On the other hand, due to the increase of turbulence velocity pulsation in the main flow region, the polymer molecular chain fracture is intensified .…”

Section: Resultsmentioning

confidence: 99%

“…On the one hand, the increase in strain rate is due to the increase in the velocity gradient between the main flow region and the wall region, thus increasing the shearing effect on the solution. 69 On the other hand, due to the increase of turbulence velocity pulsation in the main flow region, the polymer molecular chain fracture is intensified. 20,70,71 However, the average strain rate can reflect the degree of shearing when the solution flows through the partial pressure tool, so it can be used to reflect the degree of viscosity reduction.…”

Section: Effect Of Partial Pressure Tools On Polymer Concentrationsmentioning

confidence: 99%

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Experimental and numerical simulation study on the flow characteristics and optimization of structural parameters of displacement agent in partial pressure tools

Huang

et al. 2019

Energy Science & Engineering

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In order to solve the problem of reservoir heterogeneity in the process of oil displacement, Daqing oilfield has proposed a partial pressure injection technology (using partial pressure tools). The partial pressure tool can improve the overall oil displacement effect by reducing the pressure of the displacement agent and adjusting the injection amount of the displacement agent in the high‐permeability oil layer. In order to study the effect of the partial pressure tool on the polymer solution, the flow characteristics of the polymer solution in the partial pressure tool were studied by finite element analysis, and the results of the numerical simulation were compared and verified by laboratory experiments. Then, the optimal structural parameters of the partial pressure tool were selected by orthogonal experiments. Finally, field tests were carried out to verify the effectiveness of the partial pressure tool. The results show that when the flow rate is 10 m3/d, the pressure drop of the polymer solution reaches 6.08 × 105 Pa and the viscosity loss rate reaches 6.69%, while the physical parameters of the solution change periodically under the action of the partial pressure tool. At a low flow rate, the results of the laboratory experiment and numerical simulation fit well, and the optimal structural parameters of the partial pressure tool are selected. Field tests show that the oil recovery is increased by 2.54% after using partial pressure tools. The research results are of great significance to the study of resolving interlayer conflicts and enhancing oil recovery.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Partial Pressure Tools On Polymer Concentrationsmentioning

confidence: 99%

Experimental and numerical simulation study on the flow characteristics and optimization of structural parameters of displacement agent in partial pressure tools

Huang

et al. 2019

Energy Science & Engineering

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Impacts of thermally stratified medium on transient convective heat transfer between co‐axial horizontal fixed pipes: Applications of the thermal stratification

Nabwey,

Bibi,

Ashraf

et al. 2024

Z Angew Math Mech

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Thermal stratification improves coaxial pipe systems’ efficiency and stability. Thermal stratification enables accurate temperature maintenance, reduces thermal stress, optimizes heat transmission performance, and minimizes usage of energy to guarantee the system's long‐term performance. The main aim of the current study is to investigate the impacts of thermal stratification on buoyancy force flow and thermal transmission between coaxial fixed pipes. In the present research, the applications of thermally stratified medium on transient convective heat transfer between two coaxial fixed pipes are studied. A two‐dimensional mathematical formulation in terms of mutually nonlinear partial differential equations is used to analyze the unsteady flow and temperature field between the co‐axial pipes, when the internal pipe is uniformly heated and the outer wall of the external pipe is placed at infinity from the surface of the inner fixed pipe. Flow is assumed along the axial direction of the internal pipe and stationary boundary condition is assumed at the surface of the inner pipe. The coupled equations of the simulated model are solved numerically by applying the Implicit Finite Difference Technique. The computed outcomes in the form of geometrical interpretation are highlighted by using the technically advanced software TECHPLOT‐360. Comprehensive detail of the obtained results for the non‐dimensional parameters included in the flow formulation is predicted for steady state velocity, temperature distribution, time‐dependent surface shearness and time‐dependent energy shearness in results and discussion section of the manuscript. The emphasis is placed on the thermal stratification parameter in the above mentioned chief quantities. From the obtained results, it is predicted that the fluid flow pattern and thermal distribution are both reduced for rising values of the thermal stratification parameter S = 0.001, 0.03, 0.05, and 0.07. Minimum flow and thermal profile are observed at S = 0.07. Further, the amplitude of the time‐dependent surface shearness is uniformly distributed throughout the medium and the amplitude of the time‐dependent energy shearness is reduced effectively for S = 1.0, 5.0, and 10.0.

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Linear stability analysis and experimental verification of stratified air–water flow in a horizontal bend

Cited by 2 publications

References 20 publications

Experimental and numerical simulation study on the flow characteristics and optimization of structural parameters of displacement agent in partial pressure tools

Experimental and numerical simulation study on the flow characteristics and optimization of structural parameters of displacement agent in partial pressure tools

Impacts of thermally stratified medium on transient convective heat transfer between co‐axial horizontal fixed pipes: Applications of the thermal stratification

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