Flow past a heated rotating horizontal cylinder in cross-flow

Bhagat, Koustubh R.; Ranjan, Pritanshu

doi:10.1063/5.0013235

Cited by 2 publications

(1 citation statement)

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“…[21][22][23] It is also reported that the rotation involves improvement in the control of wake structure behind it. 24,25 It is further reported [26][27][28][29] that the wake instabilities behind multiple cylinders may be minimized by cylinder rotation and as the rotation rate reaches a critical value, the unsteady periodic flow changes into a steady pattern. However, the critical rotational speed depends on the parameters including Re and g*.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the thermo-fluidic transport around counter-rotating tandem circular cylinders

Chatterjee

Chaitanya

Mondal

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The work physically relates to the influence of thermal buoyancy on the flow and heat transfer of an incompressible fluid around two counter-rotating circular cylinders arranged in tandem configuration within an unconfined domain. Two-dimensional numerical simulations are conducted using a finite volume based computational fluid dynamics tool to explore the problem. The Reynolds number is taken as 100 with Prandtl number 0.71, keeping the non-dimensional spacing between the cylinders fixed at 1.5. The cylinder rotations are considered in the range of a dimensionless speed of 0 to 5. The upstream cylinder is rotating in the clockwise sense, whereas, the downstream one in the counter-clockwise sense. The buoyancy effect is analyzed for the Richardson number range 0 to 1. The flow is unsteady periodic characterized by vortex shedding around the stationary cylinders at the chosen value of the Reynolds number. The flow shows unsteadiness with vortex shedding initially with increasing rotational speed; however, at a critical value of the rotation, the flow becomes stabilized with suppression of vortex shedding. On the contrary, the cross thermal buoyancy effect destabilizes the flow into an unsteady periodic pattern. This complex interplay among the free stream flow, cross buoyancy, and counter-rotation produces intriguing fluid dynamic and thermal phenomena. The critical rotational speeds for the range of Richardson numbers are obtained as [Formula: see text] respectively for Ri = 0, 0.25, 0.5 and 1. A corresponding regime diagram is also constructed to depict the unsteady and steady zones of operation.

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