Heat transfer and flow around curved corner cylinder: effect of attack angle

Abdelhamid, Talaat; Rahma, Ahmed G.; Alam, Md. Mahbub; Chen, Rongliang; Islam, M.D.; Zhou, Qiang; Zhu, Hongjun

doi:10.1007/s42452-023-05377-w

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…A. et al [14] conducted an experimental study to investigate convection heat transfer enhancement from a circular cylinder in laminar pulsating flow with pulsating frequency from 1Hz to 12 Hz and Re from 1.02 10 4 to 2.04 10 4 . Abdelhamid et al, [15] introduced a numerical simulation for an isothermal curved cylinder with a corner radius ratio r/R (= 0.5), attack angle (α) varies between 0° ≤ α ≤ 45° at low Reynolds number Re (= 180). They observed that the fluid forces such as D and L are sensitive and have critical values at α ≈ 5° and α ≈ 12°, respectively.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of steady and pulsating flow over an isothermal cylinder with varying corner radius

Rahma,

Abdelhamid

2024

Menoufia Journal of Electronic Engineering Research

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This paper presents a numerical simulation of the flow structure, flow topology, and heat transfer of an isothermal cylinder with variable corner radius ratio (r/R) = 0, 0.1, 0.25, 0.5, 0.75, and 1.0, for two different flow regimes. One is steady and the other is pulsating flow. Here, r is the corner radius and R is the cylinder half-width. The air stream flow has a low Reynolds number Re of 100 and Prandtl number Pr = 0.7. The dimensionless amplitude of the velocity oscillations (A * ) is 40% relative to the free-stream velocity, and the dimensionless frequency is 7. The governing equations were solved using the ANSYS-FLUENT 19.2 package. The Pressure implicit with the splitting of the operator algorithm PISO is used for the pressurevelocity coupling. The results from the models agree with those in the literature. The effect of r/R on the flow structure around the cylinder is investigated for steady and pulsating flow regimes. Increasing r/R leads to the appearance of two major flow patterns around the cylinder. Pattern A appears at r/R < 0.1, which has leading-corner separation and two secondary bubbles appear on the sides of the cylinder. Pattern B appears at r/R ˃ 0.1, which has trailing-corner separation. The time-mean drag coefficient ( D ) for the pulsating flow is higher than that of the steady flow overall r/R. For the pulsating flow, D increases by about 5.37% overall r/R. The surface-and time-averaged Nusselt number increases with increasing r/R for both flow regimes.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of steady and pulsating flow over an isothermal cylinder with varying corner radius

Rahma,

Abdelhamid

2024

Menoufia Journal of Electronic Engineering Research

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Flow pattern- and forces-susceptibility to small attack angles for a rectangular cylinder

Zhou,

Zhu,

Tse

et al. 2024

Ocean Engineering

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Effect of length and attack angle of the splitter plates on circular cylinder piezoelectric water energy harvester

Shen,

Wang,

Wang

et al. 2024

Physics of Fluids

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With the micro-miniaturization of offshore wireless sensors, signal lights, and other devices and the emergence of the problem of self-powering in the distant sea, how to harvest energy from low-speed currents has become a hot spot of research nowadays. To improve the energy output power and conversion efficiency of low-speed water flow, we propose a vertical cantilever beam circular cylinders fitted with a rigid splitter plate piezoelectric energy harvester (CSPPEH). In this paper, the influence of the length and the attack angle of the splitter plate on CSPPEH has been experimentally investigated. The vibration response mechanism involving the mutual transition between vortex-induced vibration and galloping was analyzed through particle image velocimetry flow field visualization. The experimental results indicate that the vibration and piezoelectric characteristics of the CSPPEH increase initially and then decrease with the length of the splitter plates (L/D = 0–2.4) at the attack angle of 0°, which can be explained by the theoretical model of the energy harvester. It is found that the optimal vibration and piezoelectric characteristics occur at a rigid splitter plate length of 1.40D with an attack angle of 90°. The maximum values for amplitude, vibration swing angle, voltage, power, and power density are 4.96D, 21.7°, 42.68 V, 910.81 μW, and 1.94 mW/cm3, respectively. Efficiency was up to 2.2% at 0.4D length and 90° attack angle of the splitter plate. Compared to the bare circular cylinder energy harvester, the output power and efficiency are significantly improved. The demonstration of continuous charging and discharging of capacitors and light emitting diode lights is performed to show the practicability of the designed CSPPEH. Overall, the present study enables the applications of CSPPEH for realizing self-powered wireless sensing and signal lights under low-water-speed environments.

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Heat transfer and flow around curved corner cylinder: effect of attack angle

Cited by 6 publications

References 25 publications

Numerical simulation of steady and pulsating flow over an isothermal cylinder with varying corner radius

Numerical simulation of steady and pulsating flow over an isothermal cylinder with varying corner radius

Flow pattern- and forces-susceptibility to small attack angles for a rectangular cylinder

Effect of length and attack angle of the splitter plates on circular cylinder piezoelectric water energy harvester

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