Analysis of flow characteristics of two circular cylinders in cross-flow with varying Reynolds number: a review

Hishikar, Prafull; Dhiman, S. K.; Tiwari, Anil Kumar; Gaba, Vivek Kumar

doi:10.1007/s10973-021-10933-w

Cited by 22 publications

(5 citation statements)

References 75 publications

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“…An observed phenomenon in the friction factor results is the fact that the incline and slope of the graph are much sharper from 5000 to 10000 than the incline from the 10000 to 20000 Reynolds number. This is because Reynolds numbers of 2300 until 10000 are considered transitional uid ow, which means they exhibit different properties than when the uid is perfectly turbulent (Re above 10000) (Peng & Peterson, 1996;Kandlikar et al, 2003;Hishikar et al, 2022). This also makes sense as the velocity of the uid would only increase with the Reynolds number; thus, the friction factor would be reduced over time.…”

Section: Numerical Resultsmentioning

confidence: 99%

Heat Transfer Enhancement in Parallel Flow Double Pipe Heat Exchanger using Aluminum Oxide and Copper Oxide Nanofluids

Al-Ogaili

Rava

Rasheed³

et al. 2023

Preprint

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This study investigates the effects of Copper oxide (CuO) and aluminum oxide (Al2O3) nanofluids with different diameter sizes and concentrations dissolved in water on a double-pipe heat exchanger (DPHE) behavior numerically. Thereby evaluating the effect of nanofluid's characteristics on heat transfer coefficient, friction factor, Reynolds number and Nusselt number. This objective was accomplished by numerically investigating (through ANSYS) and determining the effect of volume fraction and diameter of nanoparticles on heat transfer and fluid flow via a DPHE. The results showed that under ideal conditions such as 4 vol% and diameter 25 nm, Al2O3 has a better performance by 99.61% than water under 20000 Reynolds number, while CuO performance was 93.52% at the same conditions.

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Section: Numerical Resultsmentioning

confidence: 99%

Heat Transfer Enhancement in Parallel Flow Double Pipe Heat Exchanger using Aluminum Oxide and Copper Oxide Nanofluids

Al-Ogaili

Rava

Rasheed³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Therefore, it is important to investigate the resulting effects of their interaction which may be related to structural vibration phenomenon. Many studies are available in literature to investigate the structural vibration phenomena by using more than one objects of similar diameters that may be circular/rectangular or square [1][2][3][4][5]. [6] conducted an experimental study for flow structure mechanism and heat transfer in the wake of two tandem circular cylinders by using gap spacing from g = 1.3 to 6 at Re = 7000.…”

Section: Intcylindeructionmentioning

confidence: 99%

Numerical analysis of flow past five inline square cylinders at various gap spacing with Strouhal number

Manzoor,

perveen,

Akhtar

et al. 2024

Preprint

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A two dimensional numerical study is carried out for flow past five inline square cylinders of similar size ‘D’ at Re = 150 for studding flow behavior. The gap spacing (g) between the cylinders is varied from g = 0.25–5. The flow structure mechanism is analyzed in terms of vorticity contour visualization, time-history analysis of drag and lift coefficients and physical parameters. Under the effect of gap spacing, four distinct flow modes are identified. These are, i). Shear layer reattachment flow mode, ii). Semi-developed irregular vortex shedding flow mode, iii). Fully-developed two rows vortex shedding flow mode and iv). Two rows single bluff body flow mode for cylinders C1-C5. In Force Statistics, the values of Cdmean, Cdrms, Clrms and St are calculated. The mean drag coefficient represents mixed trend by increasing the values of gap spacing for cylinders C3, C4 and C5. The maximum value of Cdmean is found at g = 5 for cylinder C1, that is 1.4594, while the minimum value of Cdmean is for cylinder C3 at g = 0.25. There may also observed some negative values of Cdmean for cylinder C2 at g = 0.25–2.25 and for cylinder C3 at g = 0.25–1.25 due to effect of thrust. Furthermore, St shows increasing behavior at small and large gap spacing i.e = 0.25–0.75 and = 1.5-5. While decreasing behavior at moderate gap spacing. The greatest value of Strouhal number is examined at g = 5 for cylinder C5, i.e 0.1521.

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“…In the modulated periodic regime, it was found that the multiple frequencies observed in the global forces acting on the downstream cylinder were more closely related to differences in the vortex-shedding frequencies of individual cylinders rather than individual shear layers. Hishikar, P. et al (Hishikar et al, 2021) analyzed the influence of different flow parameters past two circular cylinders in an affected region using different CFD simulations at 40 ≤ Re ≤ 5 × 10 6 . They determined that for different Re and G the Strouhal number does not increase linearly in the tandem alignment of the cylinders.…”

Section: Introductionmentioning

confidence: 99%

Extensive study of flow characters for two vertical rectangular polygons in a two-dimensional cross flow

Gul,

Nazeer,

Sana

et al. 2024

Front. Mech. Eng.

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Fluid dynamics problems have a significant impact on the growth of science and technologies all over the world. This study investigates viscous fluid’s behavior when interacting with two rectangular polygons positioned vertically and aligned in a staggered configuration. Two physical parameters, Reynolds Number and Gap spacings, are discussed using the Lattice Boltzmann Method for two-dimensional flow. Results are discussed in vortex snapshots, time trace histories of drag and lift coefficient, and power spectra analysis of lift coefficient. Nine distinct flow vortex streets are identified based on increasing gap spacings between the pair of two rectangular polygons. The vortex shedding mechanism is disturbed at small gap spacings and becomes optimal at large gap spacings. Different physical parameters of practical importance, like mean drag coefficient, root mean square values of drag coefficient, root mean square values of lift coefficient, and Strouhal number, approach the single rectangular polygon value at large gap spacings.

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Analysis of flow characteristics of two circular cylinders in cross-flow with varying Reynolds number: a review

Cited by 22 publications

References 75 publications

Heat Transfer Enhancement in Parallel Flow Double Pipe Heat Exchanger using Aluminum Oxide and Copper Oxide Nanofluids

Heat Transfer Enhancement in Parallel Flow Double Pipe Heat Exchanger using Aluminum Oxide and Copper Oxide Nanofluids

Numerical analysis of flow past five inline square cylinders at various gap spacing with Strouhal number

Extensive study of flow characters for two vertical rectangular polygons in a two-dimensional cross flow

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