The Transition Process of Pulsatile Flow in Grooved Channel at Intermediate Reynolds Number (Effect of Groove Length)

Kunitsugu, Koji; Nishimura, Tatsuo

doi:10.1299/kikaib.72.3074

Cited by 2 publications

(9 citation statements)

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“…The process occurs from the motion of the separation vortex from the upstream to downstream side, which follows the oscillation of flow rate shown in a recent study [10]. For numerical simulation, initially 20,000 particles filled the groove, then they were entrained by the pulsatile flow in five periods.…”

Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 78%

“…Moreover, recent work revealed that the transition process of pulsatile flow from periodic to chaotic flow is dominated by groove length [10]. These results suggest the possibility that the extension of groove length eases the limitation of using resonant heat and mass transfer enhancement by enhanced flow instability.…”

Section: Heat Transfer-asian Research 37 (4) 2008mentioning

confidence: 89%

“…At an intermediate Strouhal number range of St F = 1.37-1.91, we can find the occurrence of the large-scale roll up of tracer to the channel upstream side of the groove. In the recent study [10], the occurrence Fig. 9.…”

Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 90%

“…The experimental apparatus is the same as that in the previous studies [2,10], and the volumetric flow rate was given as Fig. 1.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…In Fig. 8, we compare the photograph of mass transport process by pulsatile flow taken during each quarter of the oscillation period with the result of tracking fluid particles [8] entrained by the numerical flow field [10] without diffusion. The condition of flow is Re s = 234, P = 0.43, and St F = 0.34 in Cavity III.…”

Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 99%

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Mass transfer enhancement by pulsatile flows in grooved channels (the effects of groove length on the resonant mass transfer enhancement)

Kunitsugu

Nishimura

Tanoue

2008

Heat Trans. Asian Res.

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The effect of groove length on the resonant mass transfer enhancement by pulsatile flow in grooved channel at intermediate Reynolds number was studied for five channels using experimental methods. The mass transport processes from the bottom of the groove to the channel were visualized by an electrolytic precipitation method, and overall and local mass transfer rates were measured by electrochemical methods with a high Schmidt number fluid. The qualitative and quantitative observations show that the range of Strouhal numbers, which gives inertia-dominated flow, is extended to the low-value region with groove length. Moreover, it is revealed that a noticeable enhancement is obtained in a specific channel at a Reynolds number for a wide range of Strouhal numbers. The results indicate that there is a specific Reynolds number for transfer enhancement in a channel.

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Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 78%

Section: Heat Transfer-asian Research 37 (4) 2008mentioning

confidence: 89%

Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 90%

“…The experimental apparatus is the same as that in the previous studies [2,10], and the volumetric flow rate was given as Fig. 1.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Section: Mass Transfer Enhancement By Pulsatile Flowsmentioning

confidence: 99%

See 3 more Smart Citations

Mass transfer enhancement by pulsatile flows in grooved channels (the effects of groove length on the resonant mass transfer enhancement)

Kunitsugu

Nishimura

Tanoue

2008

Heat Trans. Asian Res.

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Quasi-Periodic Oscillating Flows in a Channel with a Suddenly Expanded Section

Masuda

Tagawa

2019

Symmetry

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In this study, two-dimensional numerical simulation was carried out for an oscillatory flow between parallel flat plates having a suddenly expanded section. Governing equations were discretized with the second-order accuracy by a finite volume method on an unequal interval mesh system resolving finer near walls and corners to obtain the characteristics of the oscillatory flow accurately. Amplitude spectrums of a velocity component were obtained to investigate the periodic characteristics of the oscillatory flow. At low Reynolds numbers, the flow is periodic because the spectrum mostly consists of harmonic components, and then at high Reynolds numbers, it transits to a quasi-periodic flow mixed with non-harmonic components. In conjunction with the periodic oscillation of a main flow, separation vortices that are not uniform in size are generated from the corner of a sudden contraction part and pass through a downstream region coming into contact with the wall. The number of the vortices decreases rapidly after they are generated, but the vortices are generated again in the downstream region. In order to specify where aperiodicity is generated, the turbulent kinetic energy is introduced, and it is decomposed into the harmonic and non-harmonic components. The peaks of the non-harmonic component are generated in the region of the expanded section.

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The Transition Process of Pulsatile Flow in Grooved Channel at Intermediate Reynolds Number (Effect of Groove Length)

Cited by 2 publications

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Mass transfer enhancement by pulsatile flows in grooved channels (the effects of groove length on the resonant mass transfer enhancement)

Mass transfer enhancement by pulsatile flows in grooved channels (the effects of groove length on the resonant mass transfer enhancement)

Quasi-Periodic Oscillating Flows in a Channel with a Suddenly Expanded Section

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