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J P Huang - One of the best experts on this subject based on the ideXlab platform.
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a transient regime for transforming thermal convection cloaking concentrating and rotating Creeping Flow and heat flux
Journal of Applied Physics, 2018Co-Authors: J P HuangAbstract:By treating a set of equations governing transient heat and mass transfer simultaneously, here we develop the transformation theory for thermal convection with unsteady Creeping Flow in porous media, whose steady counterpart has been previously studied. We find that the transformation theory can still be valid when the temperature, density, and velocity of fluids vary with time. As applications, we design thermal cloaks, concentrators, and rotators at transient states examined by finite-element simulations, which can be used to control the magnitude or direction of heat flux in convection. Also, we discuss both the effects of natural or mixed convection and the differences between steady and unsteady states. This work develops a theory for dynamically controlling the Flow of heat associated with thermal convection.
Jiping Huang - One of the best experts on this subject based on the ideXlab platform.
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A transient regime for transforming thermal convection: Cloaking, concentrating, and rotating Creeping Flow and heat flux
Journal of Applied Physics, 2018Co-Authors: Gaole Dai, Jiping HuangAbstract:By treating a set of equations governing transient heat and mass transfer simultaneously, here we develop the transformation theory for thermal convection with unsteady Creeping Flow in porous media, whose steady counterpart has been previously studied. We find that the transformation theory can still be valid when the temperature, density, and velocity of fluids vary with time. As applications, we design thermal cloaks, concentrators, and rotators at transient states examined by finite-element simulations, which can be used to control the magnitude or direction of heat flux in convection. Also, we discuss both the effects of natural or mixed convection and the differences between steady and unsteady states. This work develops a theory for dynamically controlling the Flow of heat associated with thermal convection.By treating a set of equations governing transient heat and mass transfer simultaneously, here we develop the transformation theory for thermal convection with unsteady Creeping Flow in porous media, whose steady counterpart has been previously studied. We find that the transformation theory can still be valid when the temperature, density, and velocity of fluids vary with time. As applications, we design thermal cloaks, concentrators, and rotators at transient states examined by finite-element simulations, which can be used to control the magnitude or direction of heat flux in convection. Also, we discuss both the effects of natural or mixed convection and the differences between steady and unsteady states. This work develops a theory for dynamically controlling the Flow of heat associated with thermal convection.
Gheorghe Juncu - One of the best experts on this subject based on the ideXlab platform.
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Unsteady ternary mass transfer from a sphere in Creeping Flow
International Journal of Thermal Sciences, 2005Co-Authors: Gheorghe JuncuAbstract:Abstract The transient mass transfer from a sphere with rigid surface into a surrounding fluid Flow has been analysed for a ternary system. The concentrations inside the sphere are considered uniform. Steady, Creeping Flow is assumed around the sphere. The mass balance equations were solved numerically in spherical coordinates by a finite difference splitting method. The computations focused on the influence of the cross diffusion coefficients on the mass transfer rate at moderate Peclet numbers and different values of the Henry numbers and self-diffusivity rates. The occurrence on the sphere's surface of osmotic diffusion, diffusion barrier and reverse diffusion phenomena was also studied.
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unsteady heat and or mass transfer from a fluid sphere in Creeping Flow
International Journal of Heat and Mass Transfer, 2001Co-Authors: Gheorghe JuncuAbstract:Abstract The transient heat and/or mass transfer from a fluid sphere with internal circulation into a Flowing fluid are investigated. The temperature and/or concentration inside the sphere are considered uniform. Two cases are studied: the physical mass and/or heat transfer and the mass transfer accompanied by an isothermal, first-order irreversible chemical reaction in the continuous phase. Steady, Creeping Flow is assumed around and inside the sphere. The problem is solved by a finite difference method in the range of parameters, 10⩽ Pe ⩽1000, 0.01⩽H (Φ h )⩽100 , 0.1⩽ Da ⩽1000. The influence of distribution coefficient ( H ) or volume heat capacity ratio ( Φ h ) on the transfer rate and thermal wake phenomenon is analysed.
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Unsteady heat and/or mass transfer from a fluid sphere in Creeping Flow
International Journal of Heat and Mass Transfer, 2001Co-Authors: Gheorghe JuncuAbstract:Abstract The transient heat and/or mass transfer from a fluid sphere with internal circulation into a Flowing fluid are investigated. The temperature and/or concentration inside the sphere are considered uniform. Two cases are studied: the physical mass and/or heat transfer and the mass transfer accompanied by an isothermal, first-order irreversible chemical reaction in the continuous phase. Steady, Creeping Flow is assumed around and inside the sphere. The problem is solved by a finite difference method in the range of parameters, 10⩽ Pe ⩽1000, 0.01⩽H (Φ h )⩽100 , 0.1⩽ Da ⩽1000. The influence of distribution coefficient ( H ) or volume heat capacity ratio ( Φ h ) on the transfer rate and thermal wake phenomenon is analysed.
Daniel Weihs - One of the best experts on this subject based on the ideXlab platform.
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Creeping Flow around a finite row of slender bodies in close proximity
Journal of Fluid Mechanics, 2006Co-Authors: Efrath Barta, Daniel WeihsAbstract:The Flow through and around a finite row of parallel slender bodies in close proximity moving in a viscous incompressible fluid is studied. The motion occurs under Creeping Flow ( $\hbox{\it Re}\,{\ll}\,1$ ) conditions. This row is a model of a comb-wing configuration found in insects of the Thrips family and being developed for use for flying vehicles of mm size, operating in the Creeping Flow regime. We show here that such wings utilize viscous effects to carry along enough fluid to approximate continuous surfaces. The comb is described as a row of rod-like ellipsoids of slenderness ratio smaller than 0.01 at distances apart of order 10 times the minor axis and the Flow field is computed by distributing singularities along the major axes of the ellipsoids. Results for the drag on the individual rods, as well as for the full row are presented. It is shown that above a certain number of rods, dependent on the geometric parameters of the comb, the row acts very much like a continuous surface, with over 95% of the Flow moving around, and not through the comb. This allows a potential saving of tens of percents in wing weight. Parametric results for number of rods, rod density (ratio of inter-rod distance to rod length) and slenderness ratio are presented demonstrating the dependence of the Flow field on the configuration. It is found that 50–80 rods are required to approach the asymptotic limit of large number of rods, for various combinations of rod parameters with inter-rod distances of order of the cross-section diameter.
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Creeping Flow AROUND A FINITE ROW OF SLENDER BODIES
Advances in Engineering Mechanics — Reflections and Outlooks, 2005Co-Authors: Efrath Barta, Daniel WeihsAbstract:The Flow through and around a finite row of parallel slender bodies moving at constant low speed in a viscous incompressible fluid is studied. The motion occurs under Creeping Flow (R
Gaole Dai - One of the best experts on this subject based on the ideXlab platform.
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A transient regime for transforming thermal convection: Cloaking, concentrating, and rotating Creeping Flow and heat flux
Journal of Applied Physics, 2018Co-Authors: Gaole Dai, Jiping HuangAbstract:By treating a set of equations governing transient heat and mass transfer simultaneously, here we develop the transformation theory for thermal convection with unsteady Creeping Flow in porous media, whose steady counterpart has been previously studied. We find that the transformation theory can still be valid when the temperature, density, and velocity of fluids vary with time. As applications, we design thermal cloaks, concentrators, and rotators at transient states examined by finite-element simulations, which can be used to control the magnitude or direction of heat flux in convection. Also, we discuss both the effects of natural or mixed convection and the differences between steady and unsteady states. This work develops a theory for dynamically controlling the Flow of heat associated with thermal convection.By treating a set of equations governing transient heat and mass transfer simultaneously, here we develop the transformation theory for thermal convection with unsteady Creeping Flow in porous media, whose steady counterpart has been previously studied. We find that the transformation theory can still be valid when the temperature, density, and velocity of fluids vary with time. As applications, we design thermal cloaks, concentrators, and rotators at transient states examined by finite-element simulations, which can be used to control the magnitude or direction of heat flux in convection. Also, we discuss both the effects of natural or mixed convection and the differences between steady and unsteady states. This work develops a theory for dynamically controlling the Flow of heat associated with thermal convection.