Ultrasonic Velocity, Density, and Adiabatic Compressibility for 2,6-Dimethylpyridine + Water in the Temperature Range 293−318 K

1996 ◽  
Vol 41 (1) ◽  
pp. 128-132 ◽  
Author(s):  
Stefan Ernst ◽  
Wojciech Marczak ◽  
Dorota Kmiotek
Keyword(s):  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Temperature Range

scholarly journals Acoustic, thermal and optical properties of organic based disodium tartrate salt

2021 ◽  
Vol 2 (1) ◽  
pp. 012-027
Author(s):  
M. Sathish ◽  
K. Venkataramanan ◽  
R. Padmanaban ◽  
Helan Ruth ◽  
K. Vadivel ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aqueous Solutions ◽  
Internal Pressure ◽  
Ultrasonic Velocity ◽  
Relative Viscosity ◽  
Adiabatic Compressibility ◽  
Lower Percentage ◽  
Wada’S Constant ◽  
Different Temperatures ◽  
Solvent Molecules

In this work, acoustic, thermal, and optical properties were tested on the different concentrations of the Disodium Tartrate solutions. First, the viscosity studies were analyzed for the Disodium tartrate in the concentration range from 2% to 20% with different temperatures 303K, 308K, 313K, and 318K. It was noted that the relative viscosity and the activation energy of the prepared compound increase with increases in concentration and decreases with temperature increases. The properties like density and ultrasonic velocity are varied when increases the concentration of the aqueous solutions of Disodium Tartrate. In this study, the values of adiabatic compressibility show an inverse behavior when compared with ultrasonic velocity due to the interaction between solute and solvent molecules. Also observed that the inter-molecular free length is maximum for a lower percentage. The free volume for the compound is maximum at 2% and a minimum of 20%, since it reduces when the internal pressure increases. It was revealed that the classical absorption coefficient and relaxation time for Disodium Tartrate is minimum for lower percentage and minimum for a higher percentage. The interactions between the solute and solvent are confirmed through the property like specific Acoustical impedance. It was noted that the increase in internal pressure increases the concentration of the compound. The ion-solvent interaction was discussed by the relative association study, thus the values of relative association increases with an increase in concentration. The Rao’s and Wada’s constant increases linearly in aqueous solutions of Disodium Tartrate for the entire system.

Ultrasonic Velocity and Heat Transfer Measurement of Binary Fluid (Diethyl Amine + Tetra Hydro Furan) and Hybrid CuO Nanofluid (CuO + Diethyl Amine + Tetra Hydro Furan)

2018 ◽  
Vol 24 (8) ◽  
pp. 5721-5725
Author(s):  
B Rohini ◽  
A. Kingson Solomon Jeevaraj
Keyword(s):  
Thermal Conductivity ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Experimental Result ◽  
Binary Fluids ◽  
Binary Fluid ◽  
Diethyl Amine ◽  
Ultrasonic Assisted ◽  
Transfer Measurement ◽  
Hybrid Nanofluids

Diethylamine (DEA)+Tetrahydrofuran (THF) Binary fluids and CuO+Diethylamine+Tetrahydrofuran Hybrid CuO nanofluids of various concentrations are prepared using ultrasonic assisted methods. Ultrasonic velocity, thermal conductivity and viscosity values of binary fluids and hybrid CuO nanofluids are measured at temperatures ranging from 298 K to 318 K. Ultrasonic velocity can be used to calculate several acoustic parameters like Adiabatic compressibility (β), Inter molecular free length (Lf), Acoustical impedance (Z) which is very useful in the study of molecular interactions in the binary base fluids and hybrid CuO nanofluids. From the ultrasonic velocity studies the weak interaction present in the binary base fluids and hybrid nanofluids is confirmed. Our experimental result shows that thermal conductivity and viscosity values increases with the addition of CuO nanoparticle. The Brownian movement of the particle and inter particle forces between the molecules is responsible for the changes in thermal conductivity and viscosity.

Acoustic parameter investigation of polyvinyl acetate with acetic acid using ultrasonic technique

2013 ◽  
Vol 33 (9) ◽  
pp. 851-856 ◽  
Author(s):  
Baljinder Kaur ◽  
Kailash C. Juglan
Keyword(s):  
Acetic Acid ◽  
Ultrasonic Velocity ◽  
Polyvinyl Acetate ◽  
Ultrasonic Attenuation ◽  
Adiabatic Compressibility ◽  
Acoustic Parameter ◽  
Solvent Interaction ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Solvent Molecules

Abstract Density, viscosity and ultrasonic velocity of polyvinyl acetate with acetic acid have been measured at a temperature of 299K for different concentrations. Density and viscosity have been measured for a binary liquid mixture with a specific gravity bottle and a viscometer. Ultrasonic velocity has been measured using a single crystal interferometer at a frequency of 2 MHz. Ultrasonic velocities for the binary mixture at 1 MHz and 2 MHz was compared by taking some values from the literature. The sound velocity (V), density (ρ) and viscosity (η) were used to calculate the parameters such as adiabatic compressibility (β), acoustic impedance (Z), intermolecular free length (Lf), ultrasonic attenuation (α/f2) and relaxation time (τ). The variations of experimentally obtained parameters indicate the presence of molecular interaction between the molecules of the mixture. The ultrasonic velocity increased with an increase in concentration. Solute-solvent interaction is further confirmed by viscosity values, which increased with increasing concentration suggesting more association between solute and solvent molecules. The linear variations in Rao’s constant and Wada’s constant suggest the absence of complex formation.

Ultrasonic Relaxation in Phase Transition Region in Ferroelectric Semiconductors of Sn2P2S6 Family

2012 ◽  
Vol 184 ◽  
pp. 345-350
Author(s):  
Vytautas Samulionis ◽  
Juras Banys ◽  
Yulian Vysochanskii
Keyword(s):  
Phase Transition ◽  
Ultrasonic Velocity ◽  
Thermal Hysteresis ◽  
Ultrasonic Attenuation ◽  
Landau Theory ◽  
Velocity Change ◽  
First Order ◽  
Temperature Range ◽  
Large Hysteresis ◽  
Relative Change

The paper presents recent results of ultrasonic investigation of Sn2P2S6 family ferroelectric crystals and their solid solutions in the temperature range 100-300 K. It was shown that in Sn2P2(S,Se)6 crystals the critical ultrasonic velocity slowing down for longitudinal waves propagating along main crystallographic directions is quite sharp and large. The relative change of longitudinal ultrasonic velocity along z-axis at the phase transition gradually increased from 10 % in pure Sn2P2S6 till 25 % for sample with 0.4 content of Se. Such large velocity change causes the large ultrasonic attenuation anomaly. The increase of relaxation time: τ=τ0/(TC-T) leads to the increase of attenuation. Prefactor τ0 was shown to be very small and the critical attenuation anomaly arises in the narrow temperature range close to phase transition. In the 0.4 Se sample the phase transition is of the first order because small thermal hysteresis exists. The ultrasonic velocity behaviour in the ferroelectric phase was described using Landau theory and free energy expansion including sixth order terms. For (Sn,Pb)2P2S6 system the critical ultrasonic anomalies were smaller and the phase transition temperature substantially decreased (for 0.45 Pb sample the phase transition point was at Tc =140 K). The ultrasonic anomalies at phase transition in (PbxSn1-x)2P2S6 have large hysteresis showing that transition is of the first order, far from the critical point.

Ultrasonic Velocity and Absorption in(Li,Ag)NO3, (Na,Ag)NO3,(K,Ag)NO3, (Cs,Ag)NO3, (Li,Rb)NO3, and (Na,Rb)NO3 Melts Measured by the Pulse Transmission Method

1994 ◽  
Vol 49 (3) ◽  
pp. 481-489
Author(s):  
E. Rejek ◽  
J. Richter ◽  
A. Stark ◽  
M. Vogt
Keyword(s):  
Ultrasonic Velocity ◽  
Bulk Viscosity ◽  
Adiabatic Compressibility ◽  
Transmission Method ◽  
Absorption Data ◽  
Pulse Transmission ◽  
Ionic Melts ◽  
Measured Absorption ◽  
Cubic Polynomial ◽  
High Bulk

Abstract Ultrasonic velocity and absorption have been measured in molten (Li,Ag)NO3, (Na,Ag)NO3, (K ,Ag)NO3, (Cs,Ag)NO3, (Li,Rb)NO3, and (Na ,Rb)NO3 , and (Na,Rb)NO3 as functions of composition in the tem­perature range 230 to 300 °C. An improved pulse transmission device was applied. The obtained accuracy was 2‰o for the velocity and 2-4% for the absorption data. The ultrasonic velocity and absorption coefficient (25 MHz) were found to depend linearly on temperature. The dependence of the velocity on the mole fraction could be represented by a cubic polynomial. For the absorption values (referred to the square of frequency) a reasonable general dependence on composition could not be given. The adiabatic compressibility of all mixtures has been calculated from the measured sound velocity. The ratio bulk/shear viscosity and the bulk viscosity itself follow from the measured absorption values together with the velocity values. The conclusion from these data is that ultrasonic absorption in the six investigated systems is governed by the bulk viscosity and that structural rearrangements rather than structural relaxation of the molecules, are the reason for high bulk viscosities in ionic melts.

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