Solar Energy is radiant light and heat from the Sun, It is an important source of renewable energ... more Solar Energy is radiant light and heat from the Sun, It is an important source of renewable energy that is available in abundant and can be converted to other form of energy by latest technology. Effective utilization of solar energy is one of the challenges faced globally. One of such problem is address in this thesis. Effective Utilization of solar energy for heating water using solar heat is addressed. Efficiency of Solar heater can be addressed if we research on Operating conditions (isolation, tracking mode, operating temperature, flow rate, etc.), Properties of material. , Receiver design parameter, Concentrator geometry. In this thesis we have taken Receiver design parameters as a parameter to improve the efficiency of solar heater. Bother experimental and CDF analysis is carried and compare for Circular Shape receiver.
The forced convection heat transfer characteristics in Bingham plastic fluids from a heated ellip... more The forced convection heat transfer characteristics in Bingham plastic fluids from a heated elliptical cylinder of various aspect ratios E (=a/b) have been investigated numerically. The momentum and energy equations have been solved here by using the finite element method over wide ranges of rheological and kinematic parameters as: 0.01 6 Bn 6 100 (Bingham number), 0.01 6 Re 6 40 (Reynolds number), 1 6 Pr 6 100 (Prandtl number) and 0.1 6 E 6 10 (aspect ratio) thereby approaching the limiting conditions of a plate aligned with and transverse to the direction of mean flow. Furthermore, the influence of the type of thermal boundary condition, i.e., constant wall temperature (CWT) and constant heat flux (CHF) prescribed on the surface of the elliptical cylinder has also been examined. Extensive numerical results are reported herein in terms of the isotherm contours, variation of the Nusselt number on the surface of the cylinder for the two above-noted thermal boundary conditions and finally, the overall results are presented in terms of the surface averaged Nusselt number. Irrespective of the boundary condition prescribed on the surface of the cylinder, the Nusselt number shows a positive dependence on the both Reynolds number and Prandtl number while the effect of Bingham number is somewhat dependent on the Reynolds number range. The average Nusselt number has also been interpreted and correlated in terms of the Colburn heat transfer factor (j). Empirical correlations for the Colburn factor as functions of the Bingham number and aspect ratio have been proposed based on the present numerical results.
In the present work, the flow of Bingham plastic fluids past an elliptical cylinder has been inve... more In the present work, the flow of Bingham plastic fluids past an elliptical cylinder has been investigated numerically elucidating the effect of yield stress and fluid inertia on the momentum transfer characteristics at finite Reynolds numbers for a 100-fold variation in the aspect ratio. The governing differential equations have been solved over wide ranges of Reynolds number (0.01 6 Re 6 40) and Bingham number (0.01 6 Bn 6 100) in the laminar flow regime employing the finite element method. Furthermore, the effect of the aspect ratio (E) of the elliptical cylinder on the detailed flow characteristics has been studied by varying it from E = 0.1 to E = 10 thereby spanning varying levels of streamlining of the submerged object. In particular, new extensive results on streamline contours, shape and size of yielded/unyielded regions, shear rate profiles, surface pressure distribution and drag coefficient as functions of the Reynolds number, Bingham number and aspect ratio are presented and discussed. The functional dependence of the individual and total drag coefficients on the governing dimensionless parameters, aspect ratio, Reynolds number and Bingham number, is explored. The present results reveal a significant influence of the shape of the cylinder, i.e., aspect ratio on the detailed flow patterns and the overall hydrodynamic flow behavior of elliptical cylinders.
Solar Energy is radiant light and heat from the Sun, It is an important source of renewable energ... more Solar Energy is radiant light and heat from the Sun, It is an important source of renewable energy that is available in abundant and can be converted to other form of energy by latest technology. Effective utilization of solar energy is one of the challenges faced globally. One of such problem is address in this thesis. Effective Utilization of solar energy for heating water using solar heat is addressed. Efficiency of Solar heater can be addressed if we research on Operating conditions (isolation, tracking mode, operating temperature, flow rate, etc.), Properties of material. , Receiver design parameter, Concentrator geometry. In this thesis we have taken Receiver design parameters as a parameter to improve the efficiency of solar heater. Bother experimental and CDF analysis is carried and compare for Circular Shape receiver.
The forced convection heat transfer characteristics in Bingham plastic fluids from a heated ellip... more The forced convection heat transfer characteristics in Bingham plastic fluids from a heated elliptical cylinder of various aspect ratios E (=a/b) have been investigated numerically. The momentum and energy equations have been solved here by using the finite element method over wide ranges of rheological and kinematic parameters as: 0.01 6 Bn 6 100 (Bingham number), 0.01 6 Re 6 40 (Reynolds number), 1 6 Pr 6 100 (Prandtl number) and 0.1 6 E 6 10 (aspect ratio) thereby approaching the limiting conditions of a plate aligned with and transverse to the direction of mean flow. Furthermore, the influence of the type of thermal boundary condition, i.e., constant wall temperature (CWT) and constant heat flux (CHF) prescribed on the surface of the elliptical cylinder has also been examined. Extensive numerical results are reported herein in terms of the isotherm contours, variation of the Nusselt number on the surface of the cylinder for the two above-noted thermal boundary conditions and finally, the overall results are presented in terms of the surface averaged Nusselt number. Irrespective of the boundary condition prescribed on the surface of the cylinder, the Nusselt number shows a positive dependence on the both Reynolds number and Prandtl number while the effect of Bingham number is somewhat dependent on the Reynolds number range. The average Nusselt number has also been interpreted and correlated in terms of the Colburn heat transfer factor (j). Empirical correlations for the Colburn factor as functions of the Bingham number and aspect ratio have been proposed based on the present numerical results.
In the present work, the flow of Bingham plastic fluids past an elliptical cylinder has been inve... more In the present work, the flow of Bingham plastic fluids past an elliptical cylinder has been investigated numerically elucidating the effect of yield stress and fluid inertia on the momentum transfer characteristics at finite Reynolds numbers for a 100-fold variation in the aspect ratio. The governing differential equations have been solved over wide ranges of Reynolds number (0.01 6 Re 6 40) and Bingham number (0.01 6 Bn 6 100) in the laminar flow regime employing the finite element method. Furthermore, the effect of the aspect ratio (E) of the elliptical cylinder on the detailed flow characteristics has been studied by varying it from E = 0.1 to E = 10 thereby spanning varying levels of streamlining of the submerged object. In particular, new extensive results on streamline contours, shape and size of yielded/unyielded regions, shear rate profiles, surface pressure distribution and drag coefficient as functions of the Reynolds number, Bingham number and aspect ratio are presented and discussed. The functional dependence of the individual and total drag coefficients on the governing dimensionless parameters, aspect ratio, Reynolds number and Bingham number, is explored. The present results reveal a significant influence of the shape of the cylinder, i.e., aspect ratio on the detailed flow patterns and the overall hydrodynamic flow behavior of elliptical cylinders.
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Papers by swati patel
of various aspect ratios E (=a/b) have been investigated numerically. The momentum and energy
equations have been solved here by using the finite element method over wide ranges of rheological
and kinematic parameters as: 0.01 6 Bn 6 100 (Bingham number), 0.01 6 Re 6 40 (Reynolds number),
1 6 Pr 6 100 (Prandtl number) and 0.1 6 E 6 10 (aspect ratio) thereby approaching the limiting conditions
of a plate aligned with and transverse to the direction of mean flow. Furthermore, the influence
of the type of thermal boundary condition, i.e., constant wall temperature (CWT) and constant heat flux
(CHF) prescribed on the surface of the elliptical cylinder has also been examined. Extensive numerical
results are reported herein in terms of the isotherm contours, variation of the Nusselt number on the surface
of the cylinder for the two above-noted thermal boundary conditions and finally, the overall results
are presented in terms of the surface averaged Nusselt number. Irrespective of the boundary condition
prescribed on the surface of the cylinder, the Nusselt number shows a positive dependence on the both
Reynolds number and Prandtl number while the effect of Bingham number is somewhat dependent on
the Reynolds number range. The average Nusselt number has also been interpreted and correlated in
terms of the Colburn heat transfer factor (j). Empirical correlations for the Colburn factor as functions
of the Bingham number and aspect ratio have been proposed based on the present numerical results.
numerically elucidating the effect of yield stress and fluid inertia on the momentum transfer characteristics
at finite Reynolds numbers for a 100-fold variation in the aspect ratio. The governing differential
equations have been solved over wide ranges of Reynolds number (0.01 6 Re 6 40) and Bingham number
(0.01 6 Bn 6 100) in the laminar flow regime employing the finite element method. Furthermore, the
effect of the aspect ratio (E) of the elliptical cylinder on the detailed flow characteristics has been studied
by varying it from E = 0.1 to E = 10 thereby spanning varying levels of streamlining of the submerged
object. In particular, new extensive results on streamline contours, shape and size of yielded/unyielded
regions, shear rate profiles, surface pressure distribution and drag coefficient as functions of the Reynolds
number, Bingham number and aspect ratio are presented and discussed. The functional dependence of
the individual and total drag coefficients on the governing dimensionless parameters, aspect ratio, Reynolds
number and Bingham number, is explored. The present results reveal a significant influence of the
shape of the cylinder, i.e., aspect ratio on the detailed flow patterns and the overall hydrodynamic flow
behavior of elliptical cylinders.
of various aspect ratios E (=a/b) have been investigated numerically. The momentum and energy
equations have been solved here by using the finite element method over wide ranges of rheological
and kinematic parameters as: 0.01 6 Bn 6 100 (Bingham number), 0.01 6 Re 6 40 (Reynolds number),
1 6 Pr 6 100 (Prandtl number) and 0.1 6 E 6 10 (aspect ratio) thereby approaching the limiting conditions
of a plate aligned with and transverse to the direction of mean flow. Furthermore, the influence
of the type of thermal boundary condition, i.e., constant wall temperature (CWT) and constant heat flux
(CHF) prescribed on the surface of the elliptical cylinder has also been examined. Extensive numerical
results are reported herein in terms of the isotherm contours, variation of the Nusselt number on the surface
of the cylinder for the two above-noted thermal boundary conditions and finally, the overall results
are presented in terms of the surface averaged Nusselt number. Irrespective of the boundary condition
prescribed on the surface of the cylinder, the Nusselt number shows a positive dependence on the both
Reynolds number and Prandtl number while the effect of Bingham number is somewhat dependent on
the Reynolds number range. The average Nusselt number has also been interpreted and correlated in
terms of the Colburn heat transfer factor (j). Empirical correlations for the Colburn factor as functions
of the Bingham number and aspect ratio have been proposed based on the present numerical results.
numerically elucidating the effect of yield stress and fluid inertia on the momentum transfer characteristics
at finite Reynolds numbers for a 100-fold variation in the aspect ratio. The governing differential
equations have been solved over wide ranges of Reynolds number (0.01 6 Re 6 40) and Bingham number
(0.01 6 Bn 6 100) in the laminar flow regime employing the finite element method. Furthermore, the
effect of the aspect ratio (E) of the elliptical cylinder on the detailed flow characteristics has been studied
by varying it from E = 0.1 to E = 10 thereby spanning varying levels of streamlining of the submerged
object. In particular, new extensive results on streamline contours, shape and size of yielded/unyielded
regions, shear rate profiles, surface pressure distribution and drag coefficient as functions of the Reynolds
number, Bingham number and aspect ratio are presented and discussed. The functional dependence of
the individual and total drag coefficients on the governing dimensionless parameters, aspect ratio, Reynolds
number and Bingham number, is explored. The present results reveal a significant influence of the
shape of the cylinder, i.e., aspect ratio on the detailed flow patterns and the overall hydrodynamic flow
behavior of elliptical cylinders.