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Effects of thermal radiation on Casson fluid flow and heat transfer over an unsteady stretching surface subjected to suction/blowing

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Chinese Physics B 2013年第11期22卷 362-368页

作者： Swati mukhopadhyay Department of Mathematics The University of Burdwan

The unsteady flow of a Casson fluid and heat transfer over a stretching surface in presence of suction/blowing are investigated. The transformed equations are solved numerically by using the shooting method. The exact solution corre- sponding to the momentum equation for the steady case is obtained. Fluid velocity initially decreases with the increase of unsteadiness parameter. Due to an increasing Casson parameter the velocity field is suppressed. Thermal radiation enhances the effective thermal diffusivity and the temperature rises.

关键词： unsteady flow Casson fluid stretching surface suction/blowing

Dual solutions in boundary layer flow of a moving fluid over a moving permeable surface in presence of prescribed surface temperature and thermal radiation

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Chinese Physics B 2014年第1期23卷 279-283页

作者： Swati mukhopadhyay Department of Mathematics The University of Burdwan Burdwan-713104 W. B. India

An analysis of the heat transfer for a boundary layer forced convective flow past a moving permeable flat surface parallel to a moving fluid is presented. Prescribed surface temperature at the boundary is considered, A thermal radiation term in the energy equation is considered. The similarity solutions for the problem are obtained and the reduced ordinary differential equations are solved numerically. To support the validity of the numerical results, a comparison is made with the available results for some particular cases of this study. Dual solutions exist when the surface and the fluid move in the opposite directions.

关键词： moving fluid prescribed surface temperature suction thermal radiation

Casson fluid flow and heat transfer over a nonlinearly stretching surface

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Chinese Physics B 2013年第7期22卷 298-302页

作者： Swati mukhopadhyay Department of Mathematics the University of Burdwan

A boundary layer analysis is presented for non-Newtonian fluid flow and heat transfer over a nonlinearly stretching surface. The Casson fluid model is used to characterize the non-Newtonian fluid behavior. By using suitable transformations, the governing partial differential equations corresponding to the momentum and energy equations are converted into non-linear ordinary differential equations. Numerical solutions of these equations are obtained with the shooting method. The effect of increasing Casson parameter is to suppress the velocity field. However the temperature is enhanced with the increasing Casson parameter.

关键词： nonlinear stretching Casson fluid heat transfer similarity transformations

Heat Transfer Analysis of the Unsteady Flow of a Maxwell Fluid over a Stretching Surface in the Presence of a Heat Source/Sink

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Chinese Physics Letters 2012年第5期29卷 165-168页

作者： Swati mukhopadhyay Department of Mathematics The University of BurdwanBurdwan-713104W.B.India

The unsteady two-dimensional flow of a MHD non-Newtonian Maxwell fluid over a stretching surface with a prescribed surface temperature in the presence of a heat source/sink is *** solutions for the governing equations are *** transformed boundary layer equations are then solved numerically by using the shooting *** velocity initially decreases with the increasing unsteadiness parameter,and temperature decreases significantly due to *** is also found that the fluid velocity decreases with the increasing magnetic *** the Maxwell parameter values has the effect of suppressing the velocity field and increasing the temperature.

关键词： temperature. parameter. method.

Heat Transfer in a Moving Fluid over a Moving Non-Isothermal Flat Surface

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Chinese Physics Letters 2011年第12期28卷 183-186页

作者： Swati mukhopadhyay Department of Mathematics The University of BurdwanBurdwan-713104W.B.India

Boundary layer forced convective flow and heat transfer passing a moving flat surface parallel to a moving stream are *** power-law surface temperature of the second degree at the boundary is *** similarity solutions for the problem are obtained and the reduced ordinary differential equations are solved *** numerical results are compared with the known results from the literature for some special cases of the present study to support their *** is found that dual solutions exist when the surface and the fluid move in opposite directions.

关键词： moving ordinary directions

Effects of Slip on Unsteady Mixed Convective Flow and Heat Transfer Past a Stretching Surface

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Chinese Physics Letters 2010年第12期27卷 113-116页

作者： S. mukhopadhyay Department of Mathematics The University of Burdwan Burdwan-713104 W. B. India

Unsteady mixed convective boundary layer flow and heat transfer over a stretching vertical surface in the presence of slip axe investigated. It is noted that fluid velocity decreases due to the increasing velocity slip parameter resulting in an increase in the temperature field. The rate of heat transfer decreases with the velocity slip parameter while it increases with unsteadiness parameter. The same feature is also noticed for thermal slip parameter.

关键词： Statistical physics and nonlinear systems

Diffusion of chemically reactive species in Casson fluid flow over an unsteady permeable stretching surface

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Journal of Hydrodynamics 2013年第4期25卷 591-598页

作者： mukhopadhyay Swati VAJRAVELU Kuppalapalle Department of Mathematics The University of Burdwan Department of Mathematics Department of Mechanical Materials and Aerospace Engineering University of Central Florida

In this paper we investigate the two-dimensional flow of a non-Newtonian fluid over an unsteady stretching permeable surface. The Casson fluid model is used to characterize the non-Newtonian fluid behavior. First-order constructive/destructive chemical reaction is considered. With the help of a shooting method, numerical solutions for a class of nonlinear coupled differential equations subject to appropriate boundary conditions are obtained. For the steady flow, the exact solution is obtained. The flow features and the mass transfer characteristics for different values of the governing parameters are analyzed and discussed in detail.

关键词： chemical reaction Casson fluid mass transfer unsteady stretching suction/injection

Antioxidant activity of phytosynthesized biomatrix-loaded noble metallic nanoparticles

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1200-1208页

作者： Preeti Dauthal Mausumi mukhopadhyay Department of Chemical Engineering Sardar Vallabhbhai National Institute of Technology Surat 395007 Gujarat India Department of Chemical Engineering Marwadi University Gauridad Rajkot 360003 Gujarat India

Biofabrication of noble monometallic platinum nanoparticles(Pt-NPs) and bimetallic gold–silver nanoparticles(Au Ag-NPs) using aqueous extract of Delonix regia is presented here. Antioxidant activity of biomatrix-loaded metallic nanoparticles is estimated for scavenging of two model radicals i.e., 2,2′-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt and 1,1′-Diphenyl-2-picrylhydrazyl. Broad spectral continuum spanning from visible to ultra-violet region(Pt-NPs: 30 min) and broad high intensity absorption peak around at 500 nm(Au Ag-NPs: 10 min) in two different UV–Visible spectra confirmed the biofabrication. Nanoparticles fabricated with distorted spherical shape and crystalline face-centred-cubic geometry. Strong signal around at 2.10 ke V(pure-phase platinum) and typical X-ray peaks observed at 2.20 and 3 ke V suggested, co-existence and alloying interaction of Au and Ag in Au Ag-NPs. ζ potential(-15.2 mV: Pt-NPs and -13.9 mV: Au Ag-NPs) values suggested surface adsorption of polyphenolic compounds to provide stability. Nanoparticles exhibited pronounced antioxidant activity against free radicals through their electron/hydrogen transfer ability.

关键词： Platinum Gold-silver Nanopartides Antioxidant Free radical

Using modified Mach-Zehnder interferometer to get better nonlinear correction term of an isotropic nonlinear material

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Chinese Optics Letters 2009年第7期7卷 624-626页

作者： Ashish Pal Sourangshu mukhopadhyay Department of Physics The University of Burdwan

Nonlinear materials have been well established as photo refractive switching material. Important applica- tions of isotropic nonlinear materials are seen in self-focusing, defocusing phenomena, switching systems, etc. The nonlinear correction term is basically responsible for the optical switches. Mach-Zehnder inter- ferometer （MZI） is a well-known arrangement for determining the above correction term, but there are some major problems for finding out the term by MZI. We propose a new method of finding the nonlinear correction term as well as the second order nonlinear susceptibility of the materials by using a modified MZI system. This method may be used to find out the above parameters for any unknown nonlinear material.

关键词： Using modified Mach-Zehnder interferometer to get better nonlinear correction term of an isotropic nonlinear material EOM MZI