Phonon-particle interactions and transport processes in liquids

Gaeta, F.S.; Peluso, F.; Mita, D.G.; Albanese, C.; Castagnolo, D.

doi:10.1103/physreve.47.1066

Cited by 16 publications

(8 citation statements)

References 25 publications

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“…Beginning with a dilute gas, as the density increases, the role of potential field interactions increases until, in the liquid regime, phonon-like vibrational modes dominate heat transfer and diffusive and collision contributions are relatively minor. 46,44,47 These modes are derived from the allowed oscillations of an atom or molecule about a potential minimum, which are described by harmonic theories of liquids. 44,47,48 The Bahe−Varela pseudolattice theory 49,50 was originally developed to describe the behavior of concentrated electrolyte solutions, but has been shown to be applicable for aprotic ILs.…”

Section: ■ Introductionmentioning

confidence: 99%

“…46,44,47 These modes are derived from the allowed oscillations of an atom or molecule about a potential minimum, which are described by harmonic theories of liquids. 44,47,48 The Bahe−Varela pseudolattice theory 49,50 was originally developed to describe the behavior of concentrated electrolyte solutions, but has been shown to be applicable for aprotic ILs. 43,51,52 Like ILs, concentrated electrolyte solutions have intermediate-range order; 53,54 X-ray diffraction spectra of these solutions feature Bragg peaks like those produced by welldefined solid crystalline lattice structures.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Thermal transport behavior in liquids lies somewhere between that of solids and gases. Beginning with a dilute gas, as the density increases, the role of potential field interactions increases until, in the liquid regime, phonon-like vibrational modes dominate heat transfer and diffusive and collision contributions are relatively minor. ,, These modes are derived from the allowed oscillations of an atom or molecule about a potential minimum, which are described by harmonic theories of liquids. ,, …”

Section: Introductionmentioning

confidence: 99%

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Nanostructure–Thermal Conductivity Relationships in Protic Ionic Liquids

et al. 2014

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The thermal conductivities of nine protic ionic liquids (ILs) have been investigated between 293 and 340 K. Within this range, the thermal conductivities are between 0.18 and 0.30 W · m(-1) · K(-1). These values are higher than those typically associated with oils and aprotic ILs, but lower than those of strongly hydrogen bonding solvents like water. Weak linear decreases in thermal conductivity with temperature are noted, with the exception of ethanolammonium nitrate (EtAN) where the thermal conductivity increases with temperature. The dependence of thermal conductivity on IL type is analyzed with use of the Bahe-Varela pseudolattice theory. This theory treats the bulk IL as an array of ordered domains with intervening domains of uncorrelated structure which enable and provide barriers to heat propagation (respectively) via allowed vibrational modes. For the protic ILs investigated, thermal conductivity depends strongly on the IL cation alkyl chain length. This is because the cation alkyl chain controls the dimensions of the IL bulk nanostructure, which consists of charged (ordered domains) and uncharged regions (disordered domains). As the cation alkyl chain controls the dimensions of the disordered domains, it thus limits the thermal conductivity. To test the generality of this interpretation, the thermal conductivities of propylammonium nitrate (PAN) and PAN-octanol mixtures were examined; water selectively swells the PAN charged domain, while octanol swells the uncharged regions. Up to a certain concentration, adding water increases thermal conduction and octanol decreases it, as expected. However, at high solute concentrations the IL nanostructure is broken. When additional solvent is added above this concentration the rate of change in thermal conductivity is greatly reduced. This is because, in the absence of nanostructure, the added solvent only serves to dilute the salt solution.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanostructure–Thermal Conductivity Relationships in Protic Ionic Liquids

et al. 2014

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“…During its first flight, FluidPac will accommodate three automatic fluid physics experiments: two for studying phenomena related to the onset of thermocapillary convection in liquid/gas interfaces 1,2 and one for investigating the existence of thermal radiation forces. 3 Because the Foton spacecraft has very limited telemetry capabilities, the data produced throughout the mission must be stored in an on-board tape recorder. However, most of this scientific information consists of memorydemanding digital images that, unfortunately, greatly exceed the tape recorder's capacity.…”

Section: Introductionmentioning

confidence: 99%

Fast Fourier transform based image compression algorithm optimized for speckle interferometer measurements

1997

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In the framework of European Space Agency (ESA) FluidPac satellite mission, we have developed a fast, lossy image compression algorithm (ICA) based on a slight variation of the classical 2-D fast Fourier transform (FFT). In essence, given a monochrome picture, the ICA calculates (almost) its Fourier spectrum. It then applies a low-pass filter to eliminate all Fourier coefficients beyond a certain user-defined cutoff frequency. Finally, it further compresses by encoding the surviving FFT coefficients in a more memory efficient manner. The proposed scheme works best with pictures where the high-frequency data are of little value. This is precisely the case with electronic speckle pattern interferometer (ESPI) images. The ICA low-pass filter removes the speckle noise while preserving the useful scientific information: the interference fringe pattern. We have, however, also applied the FluidPac ICA to pictures generated by classical interferometers, photographic equipment, particle tracing instruments, and IR cameras. The results are extremely encouraging.

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“…In particular, he provides the expressions for mechanothermal and thermo-mechanical effects, as well as the propagation of shear oscillations. Similar ideas were later developed and extensively applied by Gaeta and co-workers to describe the behavior of non-isothermal liquids, allowing to interpret some of their typical phenomena, such as thermo-osmosis, thermodialysis and the Soret effect [42][43][44][45][46]. In particular the model provided the heat diffusion direction of the solute, or of the solvent, with respect to that of the applied temperature gradient.…”

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confidence: 98%

Mesoscopic collective dynamics in liquids and the Dual Model

Peluso

2021

Preprint

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In the present article it is shown how a series of experimental evidences and theoretical developments on liquid modelling, gathered for the first time, can all be framed in a mesoscopic view of liquids that are hypothesized as constituted by a population of wave packets, responsible for the propagation of elastic and thermal perturbations, and of dynamic aggregates of molecules, in continuous re-arrangement, diving in an ocean of amorphous, disordered liquid. This model, dubbed Dual Model of Liquids, is complementary to the Phonon theory of Liquid Thermodynamics, recently proposed by an independent group. The pseudo-crystalline dynamic structures, whose presence in liquids is evidenced by high energy inelastic scattering experiments, interact with a statistical population of harmonic elastic waves and anharmonic wave-packets propagating within and among the structures themselves, respectively. The expression for the interaction term is derived from “first principles” based on general considerations related to the pressure exerted by elastic waves travelling in condensed media. The anharmonic character of the interaction allows the exchange not only of energy but also of momentum between wave packets and clusters, thus determining both the displacement of the latter within the medium, and the redistribution of the energy between external, or translatory degrees of freedom of the clusters, and internal collective, vibratory degrees. Using these concepts it is possible to calculate some dynamic and thermodynamic quantities concerning the dynamics of liquids. Moreover, the interpretation of the relaxation times of the processes involved in momentum and energy transport is given, their Order-of-Magnitude is calculated, and the way in which these times are involved in the different phases of the collective dynamics of liquids is discussed. A comparison is provided with results obtained in the frame of PLT and with the forecasts for the visco-elastic transition regions. In the last part of the paper, some experiments are suggested that should be performed to provide additional details to the model.

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Phonon-particle interactions and transport processes in liquids

Cited by 16 publications

References 25 publications

Nanostructure–Thermal Conductivity Relationships in Protic Ionic Liquids

Nanostructure–Thermal Conductivity Relationships in Protic Ionic Liquids

Fast Fourier transform based image compression algorithm optimized for speckle interferometer measurements

Mesoscopic collective dynamics in liquids and the Dual Model

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