Harmonic mechanical excitations of steady convective instabilities: A means to get more uniform heat transfers in mixed convection flows?

Nicolás, Xavier; Mergui, Sophie

doi:10.1016/j.ijheatmasstransfer.2014.05.029

Cited by 4 publications

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taher et al [5] established a heat transfer correlation of Nusselt number in the fully developed zone of longitudinal roll of normal temperature water through experiments. Nicolas and Mergui [6] regulated the flow pattern structure by introducing harmonic mechanical excitation at the inlet to obtain more uniform time averaged heat transfer, the effect of which was mainly related to Re, Ra, disturbance frequency and amplitude, etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

Zhu,

Wan,

2023

Preprint

View full text Add to dashboard Cite

A series of three-dimensional numerical simulations of Poiseuille-Rayleigh-Benard (P-R-B) convection of cold water with different aspect ratios were carried out by using the finite volume method. The results indicate that the flow weakens gradually as the density inversion parameter increases, indicating that the density inversion parameter has a suppression effect on secondary flow. The average Nusselt number in the fully developed region increases with the increasing Rayleigh number and aspect ratio and the decreasing density inversion parameter. Based on the calculation results, a heat transfer correlation for the fully developed region of P-R-B convection was obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

Zhu,

Wan,

2023

Preprint

View full text Add to dashboard Cite

show abstract

Remarkable enhancement in CNT fiber synthesis by reducing convection vortex in floating catalyst chemical vapour deposition

Kaushal

Alexander²,

Mandal³

et al. 2023

Chemical Engineering Journal

View full text Add to dashboard Cite

Enhanced heat transfer in Poiseuille–Rayleigh–Bénard flows based on dielectric-barrier-discharge plasma actuation

Yan

Gao

et al. 2023

Physics of Plasmas

View full text Add to dashboard Cite

Poiseuille–Rayleigh–Bénard (PRB) flow has been observed in nature as well as many industrial applications. Enhancing the rate of heat transfer of PRB flow has long been a subject of interest in the relevant research. This study proposed a novelty non-intrusive method to control PRB flow through numerical simulations by using jets generated by nine groups of alternating-current dielectric-barrier-discharge (AC-DBD) plasma actuators arranged in the spanwise direction. We considered PRB flows ( Pr = 2/3) in air in channels with an aspect ratio equal to length/height = 20, with Reynolds numbers in the range of 10 ≤ Re ≤ 100 and a Rayleigh number of Ra = 10 000. The effect of plasma control on PRB flow was qualitatively and quantitatively analyzed. The results showed that at a low Reynolds number ( Re = 10, 20, 30), the jet generated by the plasma actuators promoted the plume on the wall to form stable transversal rolls and enhance mixed convection. At a high Reynolds number ( Re = 50, 100), the jet suppressed Poiseuille flow, promoted the rise in the flow of heat at the bottom wall, and enhanced the vertical temperature gradient. Moreover, steady DBD plasma actuation-based control significantly improved the coefficient of heat transfer of the flow, at times providing up to a tripling of transport compared to the unactuated case. The results here are useful for technological and industrial applications.

show abstract

Harmonic mechanical excitations of steady convective instabilities: A means to get more uniform heat transfers in mixed convection flows?

Cited by 4 publications

References 31 publications

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

Numerical Simulation of Poiseuille-Rayleigh-Benard Convection for Density Extreme Fluid in a Horizontal Rectangular Channel

Remarkable enhancement in CNT fiber synthesis by reducing convection vortex in floating catalyst chemical vapour deposition

Enhanced heat transfer in Poiseuille–Rayleigh–Bénard flows based on dielectric-barrier-discharge plasma actuation

Contact Info

Product

Resources

About