2023
DOI: 10.1063/5.0145900
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Effect of micro-grooves on drag reduction in Taylor–Couette flow

Abstract: Taylor-Couette flow with micro-grooves on the rotating inner cylinder is investigated to reveal the effect of surface structures on drag reduction. The Reynolds number ( Re) ranges from 160 to 18700. On the one hand, in the regimes of wave vortex flow (WVF, 160< Re<1010) and modulated wavy vortices (MWV, 1010< Re<1380) flow, the micro-grooves always reduce the torque, indicating drag reduction. Increasing either the size of micro-groove or Re, drag reduction will be enhanced. On the other hand, when the flow r… Show more

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Cited by 7 publications
(2 citation statements)
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“…The total measured torque ( T s ) consists of two components, T and T b , corresponding to the frictional resistances caused by the sides and the top/bottom ends of the cylinder, respectively. To determine T b , we used the linearization method previously employed by Greidanus et al Therefore, T is calculated by subtracting the measured T b from the measured T s , as detailed in the previous article . For each speed, the torque T s is measured for 30 s and three tests are conducted, with the torque averaged across all runs.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…The total measured torque ( T s ) consists of two components, T and T b , corresponding to the frictional resistances caused by the sides and the top/bottom ends of the cylinder, respectively. To determine T b , we used the linearization method previously employed by Greidanus et al Therefore, T is calculated by subtracting the measured T b from the measured T s , as detailed in the previous article . For each speed, the torque T s is measured for 30 s and three tests are conducted, with the torque averaged across all runs.…”
Section: Methodsmentioning
confidence: 99%
“…To determine T b , we used the linearization method previously employed by Greidanus et al 42 Therefore, T is calculated by subtracting the measured T b from the measured T s , as detailed in the previous article. 43 For each speed, the torque T s is measured for 30 s and three tests are conducted, with the torque averaged across all runs. DR is defined as…”
Section: Re R D Vmentioning
confidence: 99%