Diana Baltean-Carlès

Diana Baltean-Carlès
Sorbonne Université | UPMC · Institut Jean Le Rond d'Alembert (IJLRA) - UMR 7190

Dr.

About

66
Publications
3,566
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
192
Citations

Publications

Publications (66)
Article
Complex coupling between thermal effects and Rayleigh streaming in a standing wave guide at high acoustic levels is analyzed numerically. The approach is guided by the recent analytical study, showing that reverse streaming cells can form if the nonlinear Reynolds number exceeds a value depending on the wave frequency and thermophysical properties...
Article
Full-text available
The present study focuses on acoustically induced thermal effects on Rayleigh streaming inside a resonator. Firstly, we consider the effect of the transverse (or wall-normal) mean temperature gradient on the acoustic streaming flow generated by a standing wave between two parallel plates. Analytical expressions for acoustic quantities are developed...
Article
This study aims at exploring the potential generation of natural convective flows in thermoacoustic devices. To this effect, two thermoacoustic setups are considered without acoustic oscillations, each setup thus constituting a cavity filled with air and comprising a porous medium heated on one of its ends. In the first configuration, the porous me...
Article
Acoustic streaming generated by a plane standing wave between two infinite plates or inside a cylindrical tube is considered, under the isentropic flow assumption. A two-dimensional analysis is performed in the linear case of slow streaming motion, based on analytical formal solutions of separate problems, each associated with a specific source ter...
Article
Full-text available
This study focuses on natural convection flows within a cylindrical guide containing a porous medium. This configuration is applicable to standing-wave thermoacoustic engines, usually composed of an acoustic resonator where a (short) stack (or porous medium) is inserted, with a heat exchanger placed at one of its ends. The resulting horizontal temp...
Article
Full-text available
Rayleigh streaming is a second order mean flow generated by the interaction between a standing wave and a solid wall. At moderate acoustic levels, the streaming flow is slow, composed of two cells along a quarter wavelength: an inner cell close to the tube wall and an outer cell in the core. When increasing the acoustic level, the streaming flow in...
Article
The effect of inertia on Rayleigh streaming generated inside a cylindrical resonator where a mono-frequency standing wave is imposed, is investigated numerically and experimentally. To this effect, time evolutions of streaming cells in the near wall region and in the resonator core are analyzed. An analogy with the lid-driven cavity in a cylindrica...
Article
Rayleigh streaming is a mean flow generated by the interaction between a standing wave and a solid wall. In the case of a low amplitude wave inside a cylindrical resonator, the streaming pattern along a quarter wavelength is composed of two toroidal cells: An inner cell close to the tube wall and an outer cell in the core. In the present work the e...
Article
The interaction between an acoustic wave and a solid wall generates a mean steady flow called Rayleigh streaming, generally assumed to be second order in a Mach number expansion. This flow is well known in the case of a stationary plane wave at low amplitude: it has a half-wavelength spatial periodicity and the maximum axial streaming velocity is a...
Article
Full-text available
Rayleigh streaming is a steady flow generated by the interaction between an acoustic wave and a solid wall, generally assumed to be second order in a Mach number expansion. Acoustic streaming is well known in the case of a stationary plane wave at low amplitude: it has a half-wavelength spatial periodicity and the maximum axial streaming velocity i...
Conference Paper
Full-text available
The effect of inertia on nonlinear streaming generated inside a cylindrical resonator where a mono-frequency standing wave is imposed, is investigated numerically using two codes: A code solving the full Navier-Stokes compressible equations, assuming that the flow is isentropic in order to exclude thermal effects, and a code solving the time-averag...
Article
Full-text available
The influence of a resistive load on the starting performance of a standing-wave thermoacoustic engine is investigated numerically. The model used is based upon a low Mach number assumption; it couples the two-dimensional nonlinear flow and heat exchange within the thermoacoustic active cell with one-dimensional linear acoustics in the loaded reson...
Article
Flow dynamics in the stack and heat exchangers of a standing wave thermoacoustic engine is studied using two-dimensional direct numerical simulations. The numerical approach is based on asymptotic coupling in the low Mach number limit of a nonlinear dynamic model in the active cell with linear acoustics in the resonator. Computed results of the ini...
Article
Full-text available
The nonlinear phenomena that appear in thermoacoustic systems generate continuous secondary flows (streaming), superimposed on the dominant acoustic oscillations, reducing system efficiency. In this paper, an experimental study is presented for evaluating both acoustics and streaming in such a system. The velocity measurements, based on particle im...
Article
Full-text available
Rayleigh streaming in a cylindrical acoustic standing waveguide is studied both experimentally and numerically for nonlinear Reynolds numbers from 1 to 30 [ReNL=(U0/c0)(2)(R/δν)(2), with U0 the acoustic velocity amplitude at the velocity antinode, c0 the speed of sound, R the tube radius, and δν the acoustic boundary layer thickness]. Streaming vel...
Conference Paper
The acoustic streaming associated to standing waves in a cylindrical resonator is studied for increasing nonlinear Reynolds numbers by numerically solving the compressible Navier-Stokes equations, using a high resolution finite difference scheme. The resonator is excited by shaking it along the axis at imposed frequency, corresponding to the fundam...
Article
A model of an idealized thermoacoustic engine is formulated, coupling nonlinear flow and heat exchange in the heat exchangers and stack with a simple linear acoustic model of the resonator and load. Correct coupling results in an asymptotically consistent global model, in the small Mach number approximation. A well-resolved numerical solution is ob...
Article
An asymptotically consistent small Mach number model of a standing wave thermoacoustic engine has been developed. A simple thermoacoustic engine consists of a resonating tube within which is inserted an acoustically compact assembly, composed of a stack of conducting plates, placed between two heat exchangers. The model couples one-dimensional line...
Article
The role of unavoidable space between heat exchangers and stack inside a thermoacoustic standing wave generator is investigated. A two-dimensional Low Mach number viscous and heat conducting flow model of the active thermoacoustic cell, comprising heater and cooler separated by a stack made of parallel conducting plates, is described. Three differe...
Article
Full-text available
The aim of the present study is to characterize the velocity field in a cylindrical standing‐wave resonator, filled with nitrogen confined at high mean pressure, with a thermoacoustic wave generator. First order velocity (acoustic field) and second order velocity (streaming field) are measured simultaneously with Particle Image Velocimetry (PIV),...
Article
The present study deals with the experimental challenge of the measurement of the velocity field generated by a thermoacoustic wave. The system consists in a cylindrical standing-wave resonator, filled with gas confined at high mean pressure, driven by a thermoacoustic prime-mover. The axial and radial components of fluid velocity are measured usin...
Article
A new simulation software CRISTA has been developed at LIMSI-CNRS. It is based on the Rott's equations approximation. It computes all thermal and acoustic parameters of a given thermoacoustic device whose geometry is previously designed with another program TADESIGN. To realize the simulation, the user needs only to define a drive ratio at some poi...
Article
We performed a numerical study of the thermal and physical phenomena occurring in thermoacoustic wave generators. The goal of the simulation is to predict the amplification due to thermoacoustics of a wave initially of small amplitude. Therefore, we focus on the stack and the two heat exchangers, which we call the active cell, which is acoustically...
Article
Full-text available
Les phénomènes non linéaires présents dans les systèmes thermoacoustiques sont responsables de l'apparition des écoulements continus secondaires qui se superposent aux oscillations acoustiques dominantes, pénalisant l'efficacité des systèmes. L'objectif de cette étude est de caractériser le champ acoustique dans un résonateur contenant un générateu...
Article
Full-text available
The aim of this paper is to develop a macroscopic model for the transport of a passive solute, by diffusion and convection, in a heterogeneous medium consisting of impervious solids periodically distributed in a porous matrix. In the porous part, the flow is described by Darcy's law. Attempt is made to derive the macroscopic equation governing the...
Article
In this paper, we start from the Chang–Brown model which allows computation of flow, temperature and dopant concentration in a vertical Bridgman–Stockbarger semiconductor growth system. The modifications made by us concern the melt/solid interface. Namely, we assume that the phase transition does not take place on a flat mathematical surface, but i...
Article
In this paper we assume, like in Balint et al. [Mater. Sci. Semiconductor Process. V3/3 (2000) 115–121], that the melt/solid interface in the case of vertically stabilized Bridgman–Stockbarger semiconductor growth system is a thin layer, masking the crystal, where a weak form of the periodical structure of the crystal exists. In these conditions, u...
Article
In the case of vertically stabilized Bridgman–Stockbarger semiconductor, crystal growth system, this study compares the computed dopant fields in the neighborhood of the melt/solid interface in “uniform-diffusion-layer”, “global-thermal-convection” and “precrystallization-zone” models. Using quasi-steady state approximation, this comparison is made...
Article
Full-text available
The main purpose of this paper is to evaluate the influence of the solid inclusions located in the precrystallization-zone on the heat transport in this region. We make this evaluation in the case of semiconductor crystal growth by Bridgman-Stockbarger method, for crystal and melt having thermophysical properties similar to those of gallium-doped g...
Conference Paper
Full-text available
In this paper we present the computed dopant field in the neighborhood of the melt/solid interface in the case of Bridgman-Stockbarger semiconductor crystal growth system in microgravity. The computation is made in quasi-steady state approximation for crystal and melt with thermophysical properties similar to those of gallium-doped germanium, using...
Article
This paper is focused on the study of asymptotic stability of the stationary solutions which do not present segregation in the case of the hydrothermal crystal growth configuration. We find critical preturbations.
Article
Full-text available
Le but de cette étude est de construire un modèle macroscopique pour le transport d'un contaminant passif dans un milieu poreux, constitué par des inclusions rigides imperméables réparties de façon périodique dans une matrice poreuse. On suppose que dans la partie poreuse, l'écoulement du fluide est régi par la loi de Darcy. L'équation macroscopiqu...
Article
Full-text available
The aim of this paper is to develop a macroscopic model for the transport of a passive solute, by diffusion and convection, in a heterogeneous medium consisting of impervious solids periodically distributed in a porous matrix. In the porous part, the flow is described by Darcy's law. Attempt is made to derive the macroscopic equation governing the...

Network

Cited By