The effects of acoustic streaming on thermal convection in an enclosure with differentially heated horizontal walls

Aktas, Murat K.; Özgümüş, Türküler

doi:10.1016/j.ijheatmasstransfer.2010.07.028

Cited by 38 publications

(21 citation statements)

References 19 publications

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“…Acoustic streaming can be seen as a tool to enhance heat and mass transfer in a number of applications. [1][2][3][4][5] For instance, several studies show that ultrasounds used during solidification process can improve final material properties. [6][7][8][9][10][11][12] However, it can also unwillingly affect some processes.…”

Section: Introductionmentioning

confidence: 99%

Scaling and dimensional analysis of acoustic streaming jets

et al. 2014

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This paper focuses on acoustic streaming free jets. This is to say that progressive acoustic waves are used to generate a steady flow far from any wall. The derivation of the governing equations under the form of a nonlinear hydrodynamics problem coupled with an acoustic propagation problem is made on the basis of a time scale discrimination approach. This approach is preferred to the usually invoked amplitude perturbations expansion since it is consistent with experimental observations of acoustic streaming flows featuring hydrodynamic nonlinearities and turbulence. Experimental results obtained with a plane transducer in water are also presented together with a review of the former experimental investigations using similar configurations. A comparison of the shape of the acoustic field with the shape of the velocity field shows that diffraction is a key ingredient in the problem though it is rarely accounted for in the literature. A scaling analysis is made and leads to two scaling laws for the typical velocity level in acoustic streaming free jets; these are both observed in our setup and in former studies by other teams. We also perform a dimensional analysis of this problem: a set of seven dimensionless groups is required to describe a typical acoustic experiment. We find that a full similarity is usually not possible between two acoustic streaming experiments featuring different fluids. We then choose to relax the similarity with respect to sound attenuation and to focus on the case of a scaled water experiment representing an acoustic streaming application in liquid metals, in particular, in liquid silicon and in liquid sodium. We show that small acoustic powers can yield relatively high Reynolds numbers and velocity levels; this could be a virtue for heat and mass transfer applications, but a drawback for ultrasonic velocimetry.

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Section: Introductionmentioning

confidence: 99%

Scaling and dimensional analysis of acoustic streaming jets

et al. 2014

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“…The study of vibrations to the fluid has been the subject of several works, which is not the case for nanofluids [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Approach of Coupling Vibration Magneto-convection In Nanofluid

Syham

Elmir

Mehdaoui

2016

IJM

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“…For the case of thermally insulated vertical walls and differently heated horizontal walls, it was found that transverse temperature gradient strongly affects the acoustic streaming structures and velocities. 11,12 Daru et al 13 numerically studied nonlinear acoustic streaming in a closed two-dimensional gas filled channel with isothermal walls. The channel was shaken in the longitudinal direction in resonant conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of heat exchange and nonlinearity on acoustic streaming in a vibrating cylindrical cavity

Губайдуллин

Yakovenko

2015

The Journal of the Acoustical Society of America

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Acoustic streaming in a gas filled cylindrical cavity subjected to the vibration effect is investigated numerically. Both thermally insulated walls and constant temperature walls are considered. The range of vibration frequencies from low frequencies, at which the process can be described by an approximate analytical solution, to high frequencies giving rise to strong nonlinear effects is studied. Frequencies lower than the resonant one are chosen, and nonlinearity is achieved due to the large amplitude. The problem is solved in an axisymmetric statement. The dependence of acoustic streaming in narrow channels at vibration frequencies lower than the resonant one on the type of thermal boundary conditions is shown. The streaming vortices' directions of rotation in the case of constant temperature walls are found to be opposite to those in the case of thermally insulated walls. Different nonlinear effects, which increase with the frequency of vibration, are obtained. Nonlinear effects manifesting as the nonuniformity of average temperature, pressure, and density are in turn found to be influencing the streaming velocity and streaming structure.

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The effects of acoustic streaming on thermal convection in an enclosure with differentially heated horizontal walls

Cited by 38 publications

References 19 publications

Scaling and dimensional analysis of acoustic streaming jets

Scaling and dimensional analysis of acoustic streaming jets

Numerical Approach of Coupling Vibration Magneto-convection In Nanofluid

Effects of heat exchange and nonlinearity on acoustic streaming in a vibrating cylindrical cavity

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