Propulsion due to thermal streaming

Floryan, J. M.; Panday, S.; Aman, Sidra

doi:10.1017/jfm.2023.485

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…More recent contributions were focused on the thermal drift created by the interaction of groove and heating patterns (Abtahi & Floryan 2017; Inasawa et al. 2021) through the pattern interaction effect (Floryan & Inasawa 2021) on pumping driven by thermal drift (Floryan, Haq & Panday 2022), on propulsion driven by nonlinear thermal streaming (Floryan, Panday & Aman 2022) and on nonlinear streaming created by distributed wall transpiration (Jiao & Floryan 2021 a , b ).…”

Section: Introductionmentioning

confidence: 99%

Use of heated corrugations for propulsion

Floryan,

Aman,

Panday

2024

J. Fluid Mech.

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We show that a heating pattern applied to a surface with a corrugation pattern generates a propulsive effect. The same heating pattern applied to a smooth surface creates propulsion through nonlinear thermal streaming associated with pitchfork bifurcation. The combination of groove and heating patterns generates thermal drift, representing a forced response whose magnitude changes with the relative position of both patterns. Thermal drift is always present, while thermal streaming requires sufficiently intense heating. When both effects are active, a change in the relative position of these patterns produces rapid changes in the magnitude of propulsion, resulting in the formation of limit points. The strength of propulsion increases with a decrease in the Prandtl number and with an addition of uniform heating.

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Section: Introductionmentioning

confidence: 99%

Use of heated corrugations for propulsion

Floryan,

Aman,

Panday

2024

J. Fluid Mech.

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Heat transfer enhancement in vertical convection under spatially harmonic temperature modulation

Chong,

Qiao,

et al. 2024

International Journal of Heat and Mass Transfer

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The use of patterned heating in controlling pressure losses within sloping channels

Floryan,

Wang,

Bassom

2024

J. Fluid Mech.

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The effectiveness of utilizing heating patterns as a drag-reduction tool in sloping channels is analysed. The usefulness of heating is judged by determining the pressure gradient required to maintain the same flow rate as in the isothermal case. The key to reducing pressure loss is the formation of separation bubbles, although these bubbles are washed away at relatively large Reynolds numbers. The bubbles reduce the direct contact between the stream and the side walls, thereby reducing the friction experienced by the flow. Moreover, the fluid inside the bubbles tends to rotate, a motion provoked by longitudinal temperature gradients. This rotation also seems to reduce the resistance. On the other hand, the existence of the bubbles tends to obstruct the stream, increasing the flow resistance. In general, channels oriented close to horizontal experience a relatively small pressure loss, but this loss grows markedly as the channel inclines towards the vertical. When modest heating is applied, the pressure loss is approximately proportional to the square of the associated Rayleigh number. It is also shown that if the heating wavelength is too short or too long, the heating loses its effectiveness. In certain circumstances, it turns out that the theoretical pressure-gradient reduction achieved by judicious heating is so large that it exceeds the pressure gradient required to drive the flow in the isothermal problem. The conclusion is that in these instances, a pressure gradient of the opposite sign must be applied to prevent flow acceleration.

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Propulsion due to thermal streaming

Cited by 4 publications

References 38 publications

Use of heated corrugations for propulsion

Use of heated corrugations for propulsion

Heat transfer enhancement in vertical convection under spatially harmonic temperature modulation

The use of patterned heating in controlling pressure losses within sloping channels

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