Adiabatic Compressibility and Ultrasonic Velocity in Esters

1963 ◽  
Vol 18 (3) ◽  
pp. 449-451 ◽  
Author(s):  
M. Pancholy ◽  
S. S. Mathur
Keyword(s):  
Ultrasonic Velocity ◽  
Adiabatic Compressibility

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 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.

Phase Transition Studies in PMBAB and PEBAB

1984 ◽  
Vol 39 (7) ◽  
pp. 696-699 ◽  
Author(s):  
V. G. K. M. Pisipati ◽  
N. V. S. Rao
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Molar Volume ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
First Order ◽  
Thermal Expansion Coefficients ◽  
Methylene Unit ◽  
Expansion Coefficients ◽  
Transition Studies

The variation of density and ultrasonic velocity with temperature in N-(p-methoxybenzylidene)- p-aminobenzonitrile (PMBAB) and N-(p-ethoxybenzylidene)-p-aminobenzonitrile (PEBAB) are presented. The density jumps and thermal expansion coefficients suggest the nematic-isotropic transition of both compounds to be of first order. The adiabatic compressibility βad, molar sound velocity Rn and molar compressibility Aw are computed. The contribution of a methylene unit to the molar volume is found to be higher than literature values. The anomalous ultrasonic velocity dip at the nematic-isotropic transition for both compounds is found to be high; the value is many times those found for other nematic-isotropic or nematicsmectic A transitions.

scholarly journals Low Energy Gamma Radiation Induced Effects on Ultrasonic Velocity and Acoustic Parameters in Polyvinylidene Fluoride Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
S. S. Kulkarni ◽  
U. V. Khadke
Keyword(s):  
Polymer Solution ◽  
Dose Rate ◽  
Ultrasonic Velocity ◽  
Polyvinylidene Fluoride ◽  
Ultrasonic Attenuation ◽  
Ferroelectric Properties ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Low Energy ◽  
Acoustic Parameters

The modification of polyvinylidene fluoride (PVDF) polymer properties with irradiation is of interest as it possesses unique piezo-, pyro-, and ferroelectric properties. In this paper, we report the results of acoustic parameters of irradiated PVDF mixed with dimethylacetamide (DMAC) solution with low energy γ-source (Cs-137). The polymer solution covered with mica film assures only γ-ray passage and the duration was increased from 18 to 50 hours to achieve the higher dose rate. The dose rate was estimated using the strength of the radioactive source and the duration of the exposure. The ultrasonic velocity (v), density (ρ), and viscosity (η) of 0.2 wt% and 0.5 wt% PVDF dissolved in pure DMAC solution, irradiated with different dose rate were measured using ultrasonic interferometer (Mittal make), Pyknometer, and Oswald’s viscometer, respectively. It is observed that the values of v, ρ, and η change with dose rate. The acoustic parameters such as adiabatic compressibility (β), intermolecular free path length (Lf), acoustic impedance (Z), relative association (RA), ultrasonic attenuation (α/f2), and relaxation time (τ) are calculated using the experimental data. These results are interpreted in terms of the solute-solvent interaction in a polymer solution and scissoring chain damage.

Ultrasonic Study of Substituted Thiazoles at Different Temperatures

2015 ◽  
Vol 61 ◽  
pp. 105-109 ◽  
Author(s):  
A.B. Naik
Keyword(s):  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Effect Of Temperature ◽  
Water Mixture ◽  
Excellent Correlation ◽  
Acoustical Parameters ◽  
Temperature Variations ◽  
Solvent Interaction ◽  
Pure Solvent ◽  
Different Temperatures

Density, ultrasonic velocity of pure solvent, dimethylformamide (DMF) and ligand solutions of substituted thiazoles in DMF-water mixture were measured at different temperatures (303.15, 308.15, 313.15 and 318.15) K. Acoustical parameters such as adiabatic compressibility, intermolecular free length, acoustical impedance and relative association were determined from experimental data of density and ultrasonic velocity. The effect of temperature variations on the strength of molecular interaction has also been studied. An excellent correlation represents in terms of solute-solvent and solvent-solvent interaction at all temperatures.

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