Drag reduction in a thermally modulated channel

Hossain, M. Z.; Floryan, J. M.

doi:10.1017/jfm.2016.42

Cited by 28 publications

(12 citation statements)

References 34 publications

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“…2014) which provides a different mechanism for reduction of pressure losses. Transpiration has been used in the control of turbulent flows (Sumitani & Kasagi 1995; Quadrio, Floryan & Luchini 2005, 2007; Gomez et al. 2016; Koganezawa et al.…”

Section: Introductionmentioning

confidence: 99%

On the use of transpiration patterns for reduction of pressure losses

Jiao

Floryan

2021

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

On the use of transpiration patterns for reduction of pressure losses

Jiao

Floryan

2021

J. Fluid Mech.

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“…The combination of heating and topography patterns activates the interaction mechanism (Floryan & Inasawa 2021), which leads to thermal drift (Abtahi & Floryan 2017 b , 2018; Inasawa, Hara & Floryan 2021). It is known that patterned heating can lead to a reduction in the pressure losses along a horizontal conduit (Hossain, Floryan & Floryan 2012; Floryan & Floryan 2015; Hossain & Floryan 2016) as well as a weakening in the driving force in the case of the relative motion between two plates (Floryan, Shadman & Hossain 2018). The combination of heating and groove patterns may conceivably lead to a reduction in pressure losses greater than can be achieved by pure heating alone (Hossain & Floryan 2020).…”

Section: Introductionmentioning

confidence: 99%

Natural convection and pattern interaction in a two-dimensional vertical slot

et al. 2022

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Laminar natural convection is investigated in an infinite vertical slot which has one wall with a corrugated profile, and which is subject to either a uniform or periodic heating profile. This configuration has the attractive feature that it enables a study of the effects that may be produced via the interaction of heating and topography patterns. It is found that the addition of the grooves to an isothermal plate leads to a reduction in the vertical fluid flow and an increase of the transverse heat flow. In contrast, imposing sinusoidal heating on a flat surface generates convection that appears as counter-rotating rolls but there is no net vertical flow. The combination of the two effects of corrugation together with periodic heating leads to a plethora of flow patterns involving a combination of rolls and stream tubes that carry the fluid along the slot. The details of this vertical flow are governed by a pattern interaction effect dictated by the relative positions of the heating and corrugation patterns; when hot spots of the imposed heating overlap the peaks in the grooves the net flow is upward; in contrast, when they lie over the troughs the resultant flow is downward. The interplay between the thermal and geometrical effects weakens as the wavelength of the structure is reduced. The inclusion of a sufficiently strong uniform heating also seems to wash away the pattern interaction effect.

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“…The use of patterned heating in channels has been investigated as a method for flow control. It was shown that such heating reduces pressure losses in horizontal channels (Hossain, Floryan & Floryan 2012; Floryan & Floryan 2015; Hossain & Floryan 2016; Inasawa, Taneda & Floryan 2019). When channels are grooved the pattern interaction effect can significantly reduce pressure losses, but this relies on carefully chosen relative positions of the grooves and heating pattern (Hossain & Floryan 2020).…”

Section: Introductionmentioning

confidence: 99%

Patterned convection in inclined slots

et al. 2022

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An analysis of laminar natural convection in inclined slots subjected to patterned heating has been performed. The imposed heating takes a simple form characterized by a single Fourier mode combined with uniform heating. It is shown that periodic heating applied at the lower plate produces no net flow when the slot is either horizontal or vertical, but a net upward flow is generated when the slot is tilted. Periodic heating applied at the upper plate produces net downward flow in the inclined situation. The addition of uniform heating promotes the upward flow while cooling has the opposite effect. There is a critical inclination angle at which the maximum net flow rate is greatest. Dynamic and thermal boundary layers are present when the wavenumber of the imposed heating is large. The use of heating at both plates, with the same wavenumber, leads to a flow dominated by the plate exposed to a more intense heating; when the two plates are heated equally no net flow is observed irrespective of the inclination angle. Changes of the relative positions of the two patterns can change the net flow rate by up to 50 %. The intensity of the flow increases with reduction of the Prandtl number. If the heating applied to the plates is of different wavelength, but of the same intensity, a wide range of behaviours of the flow system is possible. The details of this response are sensitive to the ratio of the two wavenumbers.

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Drag reduction in a thermally modulated channel

Cited by 28 publications

References 34 publications

On the use of transpiration patterns for reduction of pressure losses

On the use of transpiration patterns for reduction of pressure losses

Natural convection and pattern interaction in a two-dimensional vertical slot

Patterned convection in inclined slots

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