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Mallikarjuna, B.
- Compatibility Studies of Chitosan/PEG Blend in 2% Aqueous Acetic Acid Solutions by Ultrasonic Velocity, Refractive Index and Viscosity Techniques, at 303.15 K
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Authors
A. V. Ashok Kumar Reddy
1,
C. Venkata Prasad
1,
M. Saraswathi
1,
HMP Naveen Kumar
1,
M. N. Prabhakar
1,
V. Balaji
1,
K. Madhusudhan Rao
1,
B. Yerriswami
2,
C. Lakshmi Narayana Reddy
2,
B. Mallikarjuna
2,
M. C. S. Subha
2,
K. Chowdoji Rao
1
Affiliations
1 Dept. of Polymer Science & Tech., S.K. University, Anantapur, A.P., IN
2 Dept. of Chemistry, S.K. University, Anantapur, A.P., IN
1 Dept. of Polymer Science & Tech., S.K. University, Anantapur, A.P., IN
2 Dept. of Chemistry, S.K. University, Anantapur, A.P., IN
Source
Journal of Pure and Applied Ultrasonics, Vol 31, No 4 (2009), Pagination: 160-168Abstract
Chitosan (CS), a polysaccharide, has many industrial applications and its miscibility studies are most useful. Synthetic polymer, poly (ethylene glycol) (PEG) is a subject of current research interest. Hence, miscibility of CS and PEG in aqueous acetic acid solutions has been studied by ultrasonic velocity, refractive index and viscosity techniques at 303.15 K, over a wide range of compositions ranging from 0-100% of CS in CS/PEG blends. The results of ultrasonic velocity and its derived acoustical parameters such as adiabatic compressibility (βad), acoustic impedance (Z), relaxation strength (γs) and Rao number (R) have been used to discuss the miscibility/immiscibility of the blend under study. These discussions revealed that the blend is miscible up to 40% of chitosan in the blend and beyond this, the blend is immiscible. Using the viscosity data, the interaction parameters ΔB, μ and α were computed and used to discuss the miscibility/immiscibility nature of this blend. The ultrasonic velocity results are further confirmed by viscosity and refractive index results.Keywords
Chitosan/PEG Blend, Acoustical Parameters, Miscibility, Refractive Index.- Effect of Higher Order Chemical Reaction on Double Diffusive Mixed Convective Flow Over a Rotating Vertical Cone in a Darcy Porous Medium
Abstract Views :197 |
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Authors
Affiliations
1 Department of Mathematics, BMS College of Engineering, Bangalore, Karnataka, 560019, IN
2 College of Engineering -Mechanical Engineering Department - Babylon University- Babylon City – Hilla, IQ
1 Department of Mathematics, BMS College of Engineering, Bangalore, Karnataka, 560019, IN
2 College of Engineering -Mechanical Engineering Department - Babylon University- Babylon City – Hilla, IQ
Source
Research Journal of Science and Technology, Vol 9, No 3 (2017), Pagination: 416-424Abstract
This paper examines numerically the combined effects of double diffusive mixed convective flow and higher order chemical reaction in Darcy porous medium over a rotating vertical cone. The governing equations for flow, energy and concentration are transformed into ordinary differential equation by using similarity transformation and are solved numerically by employing the fourth order Runge - Kutta method with shooting technique for different parametric values. The effects of mixed convection parameter, inverse Darcy number, and order of homogeneous chemical reaction, buoyancy ratio and chemical reaction parameter are investigated and reported graphically on velocity, temperature and concentration profiles together with the local Nusselt and Sherwood numbers. The numerical results are obtained for the mixed convection parameter varying as [0.5 ≤ gs ≤ 10] , inverse Darcy number varying as [0.5 ≤ Da-1 ≤ 3] , order of homogeneous chemical reaction varying as [1 ≤ n ≤ 4], chemical reaction parameter [-1.5 ≤ γ ≤ 3.5] and the buoyancy ratio [-0.5 ≤ N ≤ 1], while the Prandtl number is considered fixed at [Pr = 0.71].Comparison with previously published numerical work is performed and a good agreement between the results is observed. It is found that the increase in the chemical reaction parameter leads to reduce the tangential velocity and concentration profiles while, it increases the circumferential and normal velocity and temperature profiles. The results indicated that the skin-friction coefficients and the Nusselt and Sherwood numbers are strongly dependent on the buoyancy ratio. Moreover, both the local Nusselt and Sherwood numbers increase when the mixed convection parameter and the buoyancy ratio increase. Application of the present study includes rotating heat exchangers, spin stabilized missiles, packed-bed chemical reactors in geothermal and geophysics.Keywords
Double Diffusive, Mixed Convection, Higher Order Chemical Reaction, Porous Medium, Rotating Cone.References
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