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Bhowmik A.,Indian Institute of Technology Ropar | Singla R.K.,Indian Institute of Technology Ropar | Roy P.K.,Bengal Institute of Technology and Management | Prasad D.K.,National University of Singapore | And 2 more authors.
Energy Conversion and Management | Year: 2013

This work proposes the application of the Adomian decomposition method (ADM) in conjunction with the differential evolution (DE) for simultaneously estimating the dimensions of a rectangular and hyperbolic profile annular fin in order to satisfy a prescribed temperature requirement. The thermal conductivity and the surface heat transfer are assumed to be temperature-dependent. The required temperature field has been obtained using ADM for cases, involving insulated and convective boundary conditions at the tip. Then, using an inverse scheme based on DE, required fins dimensions satisfying a prescribed temperature field are estimated. Owing to the correlated nature of the unknowns, many feasible solutions have been found to lie within a given range satisfying the given temperature field. This temperature field can offer the flexibility in selecting the designing parameters. The present study is expected to be useful for selecting the dimensions of a rectangular and hyperbolic profile annular fin which can satisfy the given temperature field. © 2013 Elsevier Ltd. All rights reserved.


Singha B.,Bengal Institute of Technology and Management
Fish and Shellfish Immunology | Year: 2016

Complete lectin mapping of molluscs with their diversified recognition pattern and possible role in lectin-carbohydrate interaction based immune response triggering need much attention. In this communication, Gal/GalNAc specific three lectins AGL-IA (Anadara granosa lectin-IA), AGL-IB (A. granosa lectin-IB) and AGL-IV (A. granosa lectin-IV) and a lectin having hemolytic activity AGL-III (A. granosa lectin-III) were purified from the plasma of A. granosa bivalve by a combination of gel filtration and affinity chromatography. AGL-IA and IB were oligomeric lectins whereas, AGL-III and IV were monomeric. The molecular weight of AGL-IA, IB, III and IV were 375, 260, 45 and 33 kDa respectively. AGL-IA and IV agglutinated both rabbit and pronase treated human erythrocytes, whereas AGL-IB agglutinated only rabbit erythrocytes. AGL-III was found to agglutinate rabbit erythrocytes, however, it caused hemolysis of pronase treated human erythrocytes. The activity of all four lectins was calcium dependent and maximum at a pH range 7-8. Apart from Gal/GalNAc specific, the four lectins showed substantial differences in their carbohydrate recognition pattern. Moreover, there was a difference in the carbohydrate specificity between AGL-III and other three lectins (AGL-IA, AGL-IB and AGL-IV) towards polyvalent glycotope. On the one hand, 'cluster glycoside effect' i.e., an enhancement of the activity of a multivalent ligand, was observed for carbohydrate specificities of AGL-IA, AGL-IB, AGL-IV. On the other hand, the effect of multivalent ligands on the carbohydrate specificity of AGL-III was opposite of cluster glycoside effect. The affinity of AGL-IA, AGL-IB and AGL-IV for ligands can be ranked as follows: glycoproteins >> polysaccharide > oligosaccharides and monosaccharides. However, Gal related monosaccharides were the best inhibitors of AGL-III and the inhibitory activity decreased gradually in the following order: monosaccharide > disaccharide > polysaccharide. Thus, the diverse specificity of multiple lectins in A. granosa plasma possibly enables to recognize a wide range of microorganisms. © 2016 Elsevier Ltd.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
International Communications in Heat and Mass Transfer | Year: 2011

A study has been carried out to analyze the effects of variable thermal conductivity, Soret (thermal-diffusion) and Dufour (diffusion-thermo) on MHD non-Darcy mixed convection heat and mass transfer over a non-linear stretching sheet embedded in a saturated porous medium in the presence of thermal radiation, viscous dissipation, non-uniform heat source/sink and first-order chemical reaction. The governing differential equations transform into a set of non-linear coupled ordinary differential equations using similarity analysis. Similarity equations are then solved numerically using shooting algorithm with Runge-Kutta Fehlberg integration scheme over the entire range of physical parameters. A comparison with previously published work has been carried out and the results are found to be in good agreement. Graphical presentation of the local skin-friction coefficient, the local Nusselt number and the local Sherwood number as well as the temperature profiles show interesting features of the physical parameters. © 2010 Elsevier Ltd.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
Energy Conversion and Management | Year: 2012

Combined effects of Soret (thermal-diffusion) and Dufour (diffusion-thermo) on mixed convection over a stretching sheet embedded in a saturated porous medium in the presence of thermal radiation and first-order chemical reaction are studied. The effects of various physical parameters on the dimensionless velocity, temperature and concentration profiles are presented graphically. In addition, numerical results for the local skin friction coefficient, the local Nusselt number, and the local Sherwood number are discussed. It is found that temperature profiles increase with increase in the thermal radiation parameter and Dufour number. The effect of Soret number is to increase the concentration distribution whereas reverse effect is seen by increasing the values of the chemical reaction rate parameter on concentration distribution. © 2012 Elsevier Ltd. All rights reserved.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
Physica B: Condensed Matter | Year: 2012

An analysis has been carried out to study the effects of thermal-diffusion and diffusion-thermo on non-Darcian mixed convection heat and mass transfer of an incompressible, electrically conducting fluid over a stretching sheet embedded in a porous medium in the presence of an external magnetic field and non-uniform heat source/sink. Similarity transformations are used to convert highly non-linear partial differential equations into ordinary differential equations. Similarity equations are then solved numerically using shooting algorithm with RungeKuttaFehlberg scheme over the entire range of physical parameters. The effects of various physical parameters on the dimensionless velocity, temperature and concentration profiles are depicted graphically. Present results are compared with previously published work on various special cases of the problem and the results are found to be in very good agreement. Numerical results for local skin-friction, local Nusselt number and local Sherwood number are tabulated for different physical parameters. © 2011 Elsevier B.V. All rights reserved.


Mahapatra T.R.,Visva Bharati | Pal D.,Visva Bharati | Mondal S.,Bengal Institute of Technology and Management
International Communications in Heat and Mass Transfer | Year: 2013

The influence of thermal radiation and heat generation on an unsteady two-dimensional natural convection flow in an inclined enclosure heated from one side and cooled from the adjacent side under the influence of a magnetic field using staggered grid finite-difference technique has been studied. The governing equations have been solved numerically for streamlines, isotherms, local Nusselt numbers and the average Nusselt number for various values of thermal radiation and heat generation parameters by considering three different inclination angles and magnetic field directions, keeping the aspect ratio fixed. The results indicate that the flow pattern and temperature fields are significantly dependent on the above mentioned parameters. It is found that magnetic field suppresses the convection flow and its direction influences the flow pattern which results in the appearance of inner loop and multiple eddies. © 2012.


Mahapatra T.R.,Visva Bharati University | Pal D.,Visva Bharati University | Mondal S.,Bengal Institute of Technology and Management
International Journal of Heat and Mass Transfer | Year: 2013

The effects of uniform and non-uniform heating of wall(s) on double-diffusive natural convection in a lid-driven square enclosure are analyzed. It is assumed that the left vertical wall and bottom wall are heated and concentrated (uniformly or non-uniformly), while the other vertical wall is maintained at a constant cold temperature and the top wall is well insulated which moves with a constant speed. The governing equations are solved numerically using staggered grid finite-difference method. Streamlines, isotherms, local Nusselt number, local Sherwood number, average Nusselt number and average Sherwood number for various values of buoyancy ratio and thermal Rayleigh number are obtained. The results are compared with previously published work and excellent agreement has been obtained. © 2012 Elsevier Ltd. All rights reserved.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
International Communications in Heat and Mass Transfer | Year: 2012

In this paper we have analyzed the combined effects of magnetic field and convective diffusion of species through a non-Darcy porous medium over a vertical stretching sheet with temperature dependent viscosity and non-uniform heat source/sink. The boundary layer equations are transformed into ordinary differential equations using self-similarity transformation which are then solved numerically using fifth-order Runge-Kutta Fehlberg method with shooting technique for various values of the governing parameters. The effects of electric field parameter, non-uniform heat source/sink parameters and Schmidt number on concentration profiles are analyzed and discussed graphically. Favorable comparisons with previously published work on various special cases of the problem are obtained. © 2012 Elsevier Ltd.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
Journal of Magnetism and Magnetic Materials | Year: 2013

The present paper deals with the thermophoresis particle deposition and Soret-Dufour effects on the convective flow, heat and mass transfer characteristics of an incompressible Newtonian electrically conducting fluid having temperature-dependent viscosity over a non-isothermal wedge in the presence of thermal radiation. The governing boundary layer equations are written into a dimensionless form by similarity transformations. The transformed coupled non-linear ordinary differential equations are solved numerically. The effects of various important physical parameters are analyzed in detail. It is found that the skin friction coefficient and the local Sherwood number increase with increase in the values of thermal radiation parameter in the presence of heat generation/absorption whereas reverse effect is seen on the local Nusselt number. © 2012 Elsevier B.V. All rights reserved.


Pal D.,Visva Bharati University | Mondal H.,Bengal Institute of Technology and Management
Meccanica | Year: 2011

A boundary layer analysis is performed to study the influence of thermal radiation and buoyancy force on two-dimensional magnetohydrodynamic flow of an incompressible viscous and electrically conducting fluid over a vertical stretching sheet embedded in a porous medium in the presence of inertia effect. The governing system of partial differential equations is first transformed into system of ordinary differential equations using self-similarity transformation. A special form for magnetic field is chosen to obtain the similarity solution. The transformed boundary layer equations are solved numerically for some important values of the physical parameters. The present results are compared with the previously published papers and the results are found to be in excellent agreement. The important features of the flow, heat and mass transfer characteristics for different values of thermal radiation, porous permeability, magnetic field and buoyancy parameters are analyzed and discussed. The effects of various physical parameters on the skin friction coefficient, local Nusselt number and local Sherwood number are also presented. It is found that increase in the value of thermal radiation parameter R1 increases the skin friction coefficient and Sherwood number whereas reverse trend is seen for the local Nusselt number. © 2010 Springer Science+Business Media B.V.

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