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Capillary numbers (Ca) as function of pressure drop and Reynolds number (1)Ca = 0.0075(2)Ca = 0.0086(3)Ca = 0.015(4)Ca = 0.1000(5)Ca = 0.3500
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This is an incompressible numerical study of the hydrodynamics and heat transfer characteristics of Taylor flow in vertical oil and gas pipelines under constant heat flux using the Volume-of-fluid (VOF) method in ANSYS Fluent, covering a wide range of Re(0.22 ≤ Re ≤ 800) and Ca(0.0075 ≤ Ca ≤ 0.35). Nusselt number (Nu) correlations were used to exam...
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An experimental and numerical investigations have been carried out to show the effect of rotating outer cylinder on heat transfer and fluid flow for a horizontal annulus filled with air. The rotating outer cylinder was cooled by ambient while the inner cylinder was kept stationary and subjected to uniform heat flux. The dimensionless parameters ran...
Citations
... The authors demonstrated that there is an increase in pressure gradient, through a robust predictive owpattern-related model. Gawusu and Zhang [24] numerically presented the hydrodynamics and thermal properties of Taylor ow and demonstrated that the Capillary number (Ca) is directly proportional to the transition region between the nose of the bubble and the lm thickness. ...
The study is influenced by the significant progress made in the field of hydrodynamics and heat transfer enhancement of Taylor flow in vertical and horizontal pipelines. It maps the hydrodynamics and thermal properties of Taylor flow using 752 scientific articles published in refereed journals, extracted from the Web of Science Core Collection (WoSCC), using bibliometric analysis. The study identifies clusters that constitute the intellectual structure of the study domain, and investigates their linkages, by incorporating all citations from the Science Citation Index (SCI) from 2000–2021. The study highlights the most active, impactful, and influential parameters surrounding Taylor flow research. This analysis is critical for expanding our understanding of the intellectual network and identifying new research directions.
... The Taylor bubble moves in pipelines/channels and occupies nearly the entire cross-section of the pipeline/channel in a bullet-shaped form. Taylor bubbles are mostly prevalent in industrial operations such as in the geothermal production of steam in power plants, in thermal power plants for boiling and condensation, nuclear reactors for emergency core cooling or pipelines for the transportation of oil and gas [1][2][3][4][5][6], which makes them significant enough to be investigated in numerous applications and phenomena, such as flow related problems associated with the production of oil and gas, as seen in slug-induced corrosion [7][8][9][10]. ...
... A typical Taylor bubble has the following features: (a) a nearly hemispherical and sharply defined nose (b) a falling liquid film surrounding the body on the pipe wall (c) the tail, and (d) the wake, (Fig. 1). The body of the bubble can further be sub-divided into different sections; the upper part where the developing film accelerates and thins, and the lower part, where the equilibrium occurs on the forces acting on the film and, the film thickness (δ), and the velocity profile are steady [2,11]. The flow of Taylor bubbles, a characteristic part of the slug flow regime, has been numerically studied and experimentally verified in this study. ...
... The thin annular film creates a recirculation pattern from the bubble rear due to expansion in this region. The nature of the flow patterns and the turbulence structure in the wake enhance coefficients of heat and mass transfer, as well as global parameters [2,[12][13][14][15][16][17]. These parameters form the basis for the development of many important correlations. ...
This numerical study investigates the dynamics around a single Taylor bubble rising with small-dispersed bubbles in a vertical pipeline. The Volume-of-fluid (VOF) method in Ansys Fluent 18.1 is used to track the Taylor bubble, and the Discrete Particle Method (DPM) is used to track the small-dispersed bubbles, for the following parameter range; 812⩽Re⩽5684, Eo=94 and log(Mo)=-10.6. The coupling strategies for both the continuous gas–liquid phase as well as the discrete bubble phase are all accounted for in the numerical calculations. The dispersed bubbles significantly affect the behaviour of the rising Taylor bubble in numerous ways. The terminal velocity increases with an increase in the number of dispersed bubbles. The rise velocity is, however directly correlated with the deformation of the nose of the bubble. The flow dynamics around the nose of the Taylor bubble are stronger for low velocities due to lower inertia. The computations also demonstrated that there are both acceleration and deceleration effects on the Taylor bubble. Our predictions are in quantitative agreement with published experimental results by Cerqueira and Paladino (Int. J. Multiph. Flow, vol. 133, p. 103,450, Dec. 2020).
The study focuses on the generation of multiple numerical solutions and stability analysis for the case of an unsteady copper-alumina/water hybrid nanofluid subjected to a shrinking sheet. Heat generation as the potential contributing factor in the heat transfer progress is considered as well as the suction effect. The governing model (partial differential equations) is developed based on the boundary layer assumptions, which then are transformed into a set of ordinary (similarity) differential equations. The bvp4c solver is used to search all possible solutions and conduct the stability analysis for the generating solutions. Suction induces the movement of heated fluid particles towards the wall, resulting in increased velocity and heat transfer and a decrease in temperature. The first solution is proved to be the stable real solution as compared to the other solution.
