The Experts below are selected from a list of 1770 Experts worldwide ranked by ideXlab platform
Jali B. R. - One of the best experts on this subject based on the ideXlab platform.
-
Ultrasonic velocity and allied Acoustical parameters of 2, 4-dinitrophenyl hydrazine based Schiff base in DMSO
NISCAIR-CSIR India, 2020Co-Authors: Behura R., Behera Sunita, Palai B. B., Mishra S., Mishra M., Behera S., Nath G., Jali B. R.Abstract:1108-1112Novel 2, 4-dinitrophenyl hydrazine based Schiff bases (L1-L3) has been successfully synthesized and characterized. The ultrasonic velocity (C) and density (ρ) has been measured for the synthesized Schiff bases with DMSO (Dimethyl sulfoxide) solvents at 300 K. Using these experimental data ultrasonic Velocity, adiabatic compressibility, intermolecular free length and Specific Acoustic Impedance have been evaluated. From the experimental data, it has been found that L1 ascribed higher ultrasonic velocity as compared to other molecular probes L2 and L3. The strength and nature of interaction between the molecular probes and DMSO solvents has been discussed. Scanning electron microscope studies of molecular probes are performed to discuss the microstructure and surface functionalities
Jali, Bigyan Ranjan - One of the best experts on this subject based on the ideXlab platform.
-
Ultrasonic Velocity and Allied Acoustical Parameters of 2, 4-dinitrophenyl hydrazine based Schiff base in DMSO
Indian Journal of Chemistry -Section A (IJCA), 2020Co-Authors: Jali, Bigyan RanjanAbstract:Novel 2, 4-dinitrophenyl hydrazine based Schiff bases (L1-L3) has been successfully synthesized and characterized. The ultrasonic velocity (C) and density (ρ) has been measured for the synthesized Schiff bases with DMSO (Dimethyl sulfoxide) solvents at 300 K. Using these experimental data ultrasonic Velocity (C), adiabatic compressibility (βs), intermolecular free length (Lf) and Specific Acoustic Impedance (Z) have been evaluated. From the experimental data, it has been found that L1 ascribed higher ultrasonic velocity as compared to other molecular probes L2 and L3. The strength and nature of interaction between the molecular probes and DMSO solvents has been discussed. Scanning Electron Microscope (SEM) studies of molecular probes are performed to the microstructure and surface functionalities
Behura R. - One of the best experts on this subject based on the ideXlab platform.
-
Ultrasonic velocity and allied Acoustical parameters of 2, 4-dinitrophenyl hydrazine based Schiff base in DMSO
NISCAIR-CSIR India, 2020Co-Authors: Behura R., Behera Sunita, Palai B. B., Mishra S., Mishra M., Behera S., Nath G., Jali B. R.Abstract:1108-1112Novel 2, 4-dinitrophenyl hydrazine based Schiff bases (L1-L3) has been successfully synthesized and characterized. The ultrasonic velocity (C) and density (ρ) has been measured for the synthesized Schiff bases with DMSO (Dimethyl sulfoxide) solvents at 300 K. Using these experimental data ultrasonic Velocity, adiabatic compressibility, intermolecular free length and Specific Acoustic Impedance have been evaluated. From the experimental data, it has been found that L1 ascribed higher ultrasonic velocity as compared to other molecular probes L2 and L3. The strength and nature of interaction between the molecular probes and DMSO solvents has been discussed. Scanning electron microscope studies of molecular probes are performed to discuss the microstructure and surface functionalities
Noiray Nicolas - One of the best experts on this subject based on the ideXlab platform.
-
Modeling the nonlinear aeroAcoustic response of a harmonically forced side branch aperture under turbulent grazing flow
'American Physical Society (APS)', 2021Co-Authors: Pedergnana Tiemo, Bourquard Claire, Faure-beaulieu Abel, Noiray NicolasAbstract:Hydrodynamic modes in the turbulent mixing layer over a cavity can constructively interact with the Acoustic modes of that cavity and lead to aeroAcoustic instabilities. The resulting limit cycles can cause undesired structural vibrations or noise pollution in many industrial applications. To further the predictive understanding of this phenomenon, we propose two physics-based models which describe the nonlinear aeroAcoustic response of a side branch aperture under harmonic forcing with variable Acoustic pressure forcing amplitude pa. One model is based on Howe's classic formulation that describes the shear layer as a thin vortex sheet, and the other is based on an assumed vertical velocity profile in the side branch aperture. These models are validated against experimental data. Particle image velocimetry (PIV) was performed to quantify the turbulent and coherent fluctuations of the shear layer under increasing pa. The Specific Acoustic Impedance Z of the aperture was acquired over a range of frequencies for different bulk flow velocities U and Acoustic pressure forcing amplitudes pa. In this work, we show that once the handful of parameters in the two models for Z have been calibrated using experimental data at a given condition, it is possible to make robust analytical predictions of this Impedance over a broad range of the frequency, bulk flow velocity, and forcing amplitude. In particular, the models allow prediction of a necessary condition for instability, implied by negative values of the Acoustic resistance Re(Z), which corresponds to a reflection coefficient R of the aperture with magnitude larger than 1. Furthermore, we demonstrate that the models are able to describe the nonlinear saturation of the aeroAcoustic response caused by alteration of the mean flow at large forcing amplitudes, which was recently reported in literature. This effect stabilizes the coupling between the side branch opening and the Acoustic field in the cavity, and its quantitative description may be of value for control of aeroAcoustic instabilities. We visualize and compare the models' representations of the hydrodynamic response in the side branch aperture and of the saturation effect under increasing pa. © 2021 American Physical SocietyISSN:2469-990
-
Nonlinear aeroAcoustic response of a harmonically forced side branch aperture under turbulent grazing flow: modelling and experiments
2020Co-Authors: Pedergnana Tiemo, Bourquard Claire, Faure-beaulieu Abel, Noiray NicolasAbstract:Hydrodynamic modes in the turbulent mixing layer over a cavity can constructively interact with the Acoustic modes of that cavity and lead to aeroAcoustic instabilities. The resulting limit cycles can cause undesired structural vibrations or noise pollution in many industrial applications. To further the predictive understanding of this phenomenon, we propose two physics-based models which describe the nonlinear aeroAcoustic response of a side branch aperture under harmonic forcing with variable Acoustic pressure forcing amplitude pa. One model is based on Howe's classic vortex sheet formulation, and the other on an assumed vertical velocity profile in the side branch aperture. These models are validated against experimental data. Particle image velocimetry (PIV) was performed to quantify the turbulent and coherent fluctuations of the shear layer under increasing pa. The Specific Acoustic Impedance Z of the aperture was acquired over a range of frequencies f for different bulk flow velocities U and Acoustic pressure forcing amplitudes pa. We show that, once the handful of parameters in the two models for Z have been calibrated using experimental data at a given condition, it is possible to make robust analytical predictions of this Impedance over a broad range of f, U and pa. In particular, the models allow prediction of a necessary condition for instability, implied by negative values of the Acoustic resistance Re(Z). Furthermore, we demonstrate that the models are able to describe the nonlinear saturation of the aeroAcoustic response caused by alteration of the mean flow at large forcing amplitudes, which was recently reported in literature. This effect stabilizes the coupling between the side branch opening and the Acoustic field in the cavity, and its quantitative description may be of value for control of aeroAcoustic instabilities
Dinesh Kumar - One of the best experts on this subject based on the ideXlab platform.
-
volumetric viscosity and ultrasonic studies of solute solute and solute solvent interactions of glycine and diglycine in water and in aqueous citric acid at different temperatures
Journal of Molecular Liquids, 2017Co-Authors: Shashi Kant Lomesh, Dinesh KumarAbstract:Abstract Densities, ρ, ultrasonic speeds, u and viscosities, ƞ of glycine and diglycine in water and 0.1 mol·kg− 1 aqueous citric acid solutions were measured over the temperature range (298.15 to 313.15) K at the interval of 5 K at atmospheric pressure. From these experimental data apparent molar volume ФV, limiting apparent molar volume ФVO and the slope SV, partial molar expansibilities ФEO, adiabatic compressibility β, transfer volume ФVOtr, Falkenhagen coefficient A, Jone- Dole coefficient B, the temperature derivative of B coefficient dB/dT, intermolecular free length (Lf), Specific Acoustic Impedance (Z), and molar compressibility (W) were calculated. The results are interpreted in terms of solute–solute and solute-solvent interactions. It was observed that glycine and diglycine act as structure breakers in aqueous citric acid at different temperatures.
-
molecular interaction studies of antibiotic drug doxycycline hyclate with aqueous mannitol using volumetric and Acoustic methods
Journal of Molecular Liquids, 2017Co-Authors: Shashi Sharma, Dinesh Kumar, Vikas Nathan, Kamal KishoreAbstract:Abstract The behaviour of Doxycycline Hyclate (DH) in aqueous mannitol solution was studied to explore molecular interactions at different temperatures. The volumetric and Acoustic studies were used for investigating the interactions of drug Doxycycline Hyclate in water and aqueous mannitol system. The Density (ρ) and ultrasonic velocity (u) of Doxycycline Hyclate in water and in (0.1, 0.2 and 0.4) mol·kg− 1 aqueous solutions of mannitol have been measured at (305.15, 310.15 and 315.15 K) temperatures and atmospheric pressure. The density data was analysed with the help of Masson's equation. The positive value of (Φv0) for DH indicates solute-solvent interactions The solute-solute interactions were determined from Masson's coefficient, (Sv) in water-mannitol system at different temperatures. The ultrasonic velocity data of DH in water and water-mannitol system were used to determine adiabatic compressibility (β), intermolecular free length (Lf), and Specific Acoustic Impedance (Z). The structure making/breaking behaviour of DH in water and water mannitol system is determined on the basis of Hepler's equation. The UV spectra for DH in water and water-mannitol system stand in support of molecular interactions between drug and mannitol.