A comprehensive study on the power-law fluid flow around and through a porous cylinder with different aspect ratios

Amini, Yasser; Izadpanah, Ehsan; Zeinali, Mohammadreza

doi:10.1016/j.oceaneng.2024.117035

Cited by 2 publications

(2 citation statements)

References 44 publications

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“…In the past few decades, flows around cylinders have been extensively investigated by experiments [4,5] and the numerical method [6,7]. For example, Duan and Wan [8] numerically analyzed the wake characteristics of flows around a circular cylinder at Re = 3900.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, there have been abundant achievements concerning flows around the cylinders from multiple aspects, such as the different Reynolds numbers [9,14], conditions of incoming flow [15], section shapes [5,6,14] and geometric arrangements [16][17][18]. Comprehensive research achievements can refer to many specialized topic reviews [19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

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To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under the wall effect, the two-dimensional (2D) flows around the near-wall single, two tandem and parallel cylinders are simulated under different gap ratios (0.15 ≤ G/D ≤ 3.0) and spacing ratios (1.5 ≤ T/D ≤ 4.0) at a Reynolds number of Re = 6300. We also examine the wake patterns, the force coefficients, and the vortex-shedding frequency with emphases on the wall effect and effects of the two-cylinder interference. A critical wall gap of G/D = 0.6 is identified in the single-cylinder case where the wall can exert significant influences. The two near-wall tandem cylinders exhibit three wake states: stretching mode, attachment mode, and impinging mode. The force coefficients on the upstream cylinder are significantly affected by the wall for G/D ≤ 0.6. The downstream cylinder is mainly influenced by the upstream cylinder. For G/D > 0.6, the force coefficients on the two cylinders exhibit a similar variation trend. In the parallel arrangement, the two cylinders exhibit four wake states in different G/D and T/D ranges: double stretching mode, hetero-vortex scale mode, unilateral vortex mode, and free vortex mode. Moreover, the two parallel cylinders in the hetero-vortex scale or free vortex mode have two states: synchronous in-phase state and synchronous out-of-phase state. The mean drag coefficients on the two cylinders decrease, while the mean lift coefficients exhibit opposite variation trends, as the T/D grows.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

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Impact of free-stream orientation and thermal buoyancy on aerodynamic and heat transfer characteristics in mixed convective flow past an elliptical cylinder

Garg,

Arif,

Hasan

2024

Physics of Fluids

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This study conducts a thorough numerical investigation into the aerodynamic and heat transfer characteristics of mixed convective flow past an elliptical cylinder. Analysis is carried out for a constant Reynolds number (Re = 100), a Prandtl number (Pr = 0.71), and an angle of attack (λ=0°), utilizing the Oberbeck–Boussinesq approximation to solve mass, momentum, and energy equations via an in-house numerical solver. It explores a wide range of free-stream orientations, from 0° (upward flow aligned with gravity) to 90° (cross-flow). Additionally, Richardson number (Ri) is varied from forced convection (Ri = 0) to mixed convection regimes, up to Ri = 1.25. Two aspect ratios (AR=Major axis length/Minor axis length), specifically 2 and 4, are examined to assess their impact on flow behavior. The paper elucidates variations of lift coefficient, drag coefficient, and Nusselt number with Ri at different free-stream orientations. Furthermore, it investigates dynamics of both steady and unsteady flow regimes, correlating flow behavior with observed aerodynamic and heat transfer characteristics. Steady and unsteady periodic flow regimes are identified in the parametric space of (α, Ri) for AR = 2 and 4. The mean heat transfer rate increases with Ri in both steady and unsteady flow regimes at (α=0°, 30°, and 60°) for AR = 2 and 4, except at α=90°, where it decreases. These findings provide insights for designing compact heat exchangers utilizing elliptic tube cross-sections.

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A comprehensive study on the power-law fluid flow around and through a porous cylinder with different aspect ratios

Cited by 2 publications

References 44 publications

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Impact of free-stream orientation and thermal buoyancy on aerodynamic and heat transfer characteristics in mixed convective flow past an elliptical cylinder

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