Relaminarization of turbulent channel flow using traveling wave-like wall deformation

Nakanishi, Rio; Mamori, Hiroya; Fukagata, Koji

doi:10.1016/j.ijheatfluidflow.2012.01.007

Cited by 70 publications

(42 citation statements)

References 28 publications

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“…In contrast, the drag and heat transfer in Case 6 decrease similarly to those in the relaminarization case: they rapidly increase over the unity, and decrease again. This is the case of the unstable relaminarization: the turbulence recovery is due to the inflection-point instability of the mean velocity (Nakanishi et al, 2012). Case 7 shows the increase of both the normalized drag and heat transfer.…”

Section: Control Performancementioning

confidence: 95%

“…The present DNS code is based on that of Fukagata et al (2006) and Nakanishi et al(2012) and extended here to account for the heat transfer. The governing equations are spatially discretized on a staggered grid system with an energy-conservative second-order finite difference method (Kajishima, 1999;Ham et al, 2002).…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…Hoepffner and Fukagata (2009) showed that a net flux is induced by the traveling wave-like wall deformation in the same direction as the wave in the absence of pressure gradient, indicating that the drag reduction by a traveling wave-like wall deformation could be achieved by a downstream wave. Following this finding, Nakanishi et al (2012) performed DNS of a turbulent channel flow controlled using a streamwise traveling wave-like wall deformation. As expected, the drag was found to decrease with the wave traveling in the downstream direction.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, as a extension of the studies of Nakanishi et al (2012) and Higashi et al (2011), we perform DNS of the turbulent channel flow to investigate whether the similarity between the momentum transfer and the heat transfer can be broken by the traveling wave-like wall deformation. Figure 1 shows the schematic of the channel flow with a traveling wave-like wall deformation.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer in fully developed turbulent channel flow with streamwise traveling wave-like wall deformation

Uchino¹,

Mamori

Fukagata³

2017

JTST

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The dissimilarity between the momentum and heat transfer due to streamwise traveling wave-like wall deformation in turbulent channel flows is investigated through direct numerical simulations. The flow rate is kept constant, and the bulk Reynolds number is Re b = 5600. A constant temperature difference condition is imposed on the channel walls. The parametric study shows that the heat transfer is enhanced when the wave travels in the upstream direction. The maximum analogy factor is found to be 1.13, i.e., 13% enhancement of heat transfer under a given pressure gradient, when the wall deformation amplitude is large and the wall deformation period is short. An analysis using the identity equations for the drag and the heat transfer with a three component decomposition reveals that the random component plays an important role in the enhancement of the heat transfer.

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Section: Control Performancementioning

confidence: 95%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat transfer in fully developed turbulent channel flow with streamwise traveling wave-like wall deformation

Uchino¹,

Mamori

Fukagata³

2017

JTST

Self Cite

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“…Our application has never been experimentally investigated, but on the basis of the two available numerical studies [8,33] it can be estimated that the best-performing peristaltic waves are achieved with a pipe contraction of 8%, which is our design target. In order to reach that contraction by using a NiTi wire working at a percentage lower than 4%, we need to design a rigid device that is able to geometrically amplify the wire linear contraction, as illustrated in figure 2(b).…”

Section: Performance Requirementsmentioning

confidence: 99%

Design and experimental characterization of a NiTi-based, high-frequency, centripetal peristaltic actuator

Borlandelli

Nespoli²,

Rigamonti³

et al. 2015

Smart Mater. Struct.

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Abstract. Development and experimental testing of a device for peristaltic pumping We present and discuss the results of the full experimental investigation of the actuator performance, measured in terms of its ability to reduce the pipe diameter, at a sustained frequency of 1.5 Hz. Moreover, we investigate how the diameter contraction is influenced ✿✿✿✿✿✿ affected ✿ by various design parameters as well as actuation frequencies up to 4 Hz. We manage to make the NiTi wire work at 3% in strain, cyclically providing the designed pipe wall displacement. The actuator performance is found to decay approximately linearly with actuation frequencies up to 4 Hz. Also, the interface between the wire and the aluminum parts is found to be essential in defining the actuator functional performance

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Drag Reduction by Surface Actuation

Albers

Meinke

Schröder

2021

High Performance Computing in Science and Engineering '19

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Relaminarization of turbulent channel flow using traveling wave-like wall deformation

Cited by 70 publications

References 28 publications

Heat transfer in fully developed turbulent channel flow with streamwise traveling wave-like wall deformation

Heat transfer in fully developed turbulent channel flow with streamwise traveling wave-like wall deformation

Design and experimental characterization of a NiTi-based, high-frequency, centripetal peristaltic actuator

Drag Reduction by Surface Actuation

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