A conjugate heat transfer model of fluid flow across a solid heat conducting structure has been b... more A conjugate heat transfer model of fluid flow across a solid heat conducting structure has been built. Two examples are presented: a.) air-stream cooling of the solid structure and b.) flow across rods with volumetric heat generation. To construct
the model, a Volume Average Technique (VAT) has been applied to the momentum and the energy transport equations for a fluid and a solid phase to develop a specific form of porous media flow equations. The model equations have been solved with the semi-analytical Galerkin method. The detailed velocity and temperature fields in the fluid flow and the solid structure have been obtained. Using the solution fields, the whole-section drag coefficient Cd and the whole-section Nusselt number Nu have been also calculated. To validate the developed solution procedure, the results have been compared to the results of the finite volume method and to the experimental data. The comparison demonstrates an excellent agreement.
The investigation makes use of an experimental apparatus which is similar to that employed by Sun... more The investigation makes use of an experimental apparatus which is similar to that employed by Sun and Edwards (1970). Three sets of multicelled rectangular honey combs were used. Data regarding the effect of the angle of inclination on the Rayleigh number for Nu = 1.1 and Nu = 1.25 are presented in a table. The relations between Nusselt number and
ABSTRACT Model and experimental investigations of electrodynamic properties of tunable structures... more ABSTRACT Model and experimental investigations of electrodynamic properties of tunable structures from liquid-impregnated porous magnetic media are presented. Microwave spectra of complex permittivity and permeability of dry and liquid- impregnated media with ethyl alcohol or water-alcohol mixtures were measured. Real and imaginary parts of permittivity were found to exceed the upper Wiener boundary. Dielectric and magnetic properties of liquid-impregnated porous ferrite media were modeled using non-local volume averaging theory (VAT). This approach accounts for several hierarchical levels and morphology of the system.
The morphological description of particles generated from overheated wire insulations in microgra... more The morphological description of particles generated from overheated wire insulations in microgravity and terrestrial environments. Mark R Paul, Farrokh Issacci, George E Apostolakis, Ivan Catton Heat transfer in microgravity systems-1993, 59-66, 1993. ...
The estimation of heat-removal-capability from core debris that may be formed as a result of a hy... more The estimation of heat-removal-capability from core debris that may be formed as a result of a hypothetical fuel disruptive accident in a LMFBR is of interest in the nuclear reactor safety analysis. After the accident, the fuel debris in the form of particles may settle on various horizontal surfaces, such as thermal baffles, and there may exist an overlying sodium layer above the core debris bed. The decay heat from the fuel debris bed will be removed either by conduction or convection across the superposed layer before the initiation of ebullition. Experimental observations of the onset of convective motion in such beds of inductively heated particles have been made. The data for the heat transfer coefficient have been obtained in water-cooled beds of 304 stainless steel particles. The observations show that increasing the depth of the fluid layer over the bed tends to lower the critical internal Rayleigh number at which the onset of convection occurs. For overlying fluid-layer-depth-to-particulate-bed-depth ratios of 1 of greater, natural convection has been observed to begin at RI approximately equal to 12. However, for no fluid layer at the top of the bed, natural convection has been observed to occur at R sub I approximately equal to 45, which is about the same as observed in earlier studies made with Joule heating and no fluid layer at the top of the bed.
A conjugate heat transfer model of fluid flow across a solid heat conducting structure has been b... more A conjugate heat transfer model of fluid flow across a solid heat conducting structure has been built. Two examples are presented: a.) air-stream cooling of the solid structure and b.) flow across rods with volumetric heat generation. To construct
the model, a Volume Average Technique (VAT) has been applied to the momentum and the energy transport equations for a fluid and a solid phase to develop a specific form of porous media flow equations. The model equations have been solved with the semi-analytical Galerkin method. The detailed velocity and temperature fields in the fluid flow and the solid structure have been obtained. Using the solution fields, the whole-section drag coefficient Cd and the whole-section Nusselt number Nu have been also calculated. To validate the developed solution procedure, the results have been compared to the results of the finite volume method and to the experimental data. The comparison demonstrates an excellent agreement.
The investigation makes use of an experimental apparatus which is similar to that employed by Sun... more The investigation makes use of an experimental apparatus which is similar to that employed by Sun and Edwards (1970). Three sets of multicelled rectangular honey combs were used. Data regarding the effect of the angle of inclination on the Rayleigh number for Nu = 1.1 and Nu = 1.25 are presented in a table. The relations between Nusselt number and
ABSTRACT Model and experimental investigations of electrodynamic properties of tunable structures... more ABSTRACT Model and experimental investigations of electrodynamic properties of tunable structures from liquid-impregnated porous magnetic media are presented. Microwave spectra of complex permittivity and permeability of dry and liquid- impregnated media with ethyl alcohol or water-alcohol mixtures were measured. Real and imaginary parts of permittivity were found to exceed the upper Wiener boundary. Dielectric and magnetic properties of liquid-impregnated porous ferrite media were modeled using non-local volume averaging theory (VAT). This approach accounts for several hierarchical levels and morphology of the system.
The morphological description of particles generated from overheated wire insulations in microgra... more The morphological description of particles generated from overheated wire insulations in microgravity and terrestrial environments. Mark R Paul, Farrokh Issacci, George E Apostolakis, Ivan Catton Heat transfer in microgravity systems-1993, 59-66, 1993. ...
The estimation of heat-removal-capability from core debris that may be formed as a result of a hy... more The estimation of heat-removal-capability from core debris that may be formed as a result of a hypothetical fuel disruptive accident in a LMFBR is of interest in the nuclear reactor safety analysis. After the accident, the fuel debris in the form of particles may settle on various horizontal surfaces, such as thermal baffles, and there may exist an overlying sodium layer above the core debris bed. The decay heat from the fuel debris bed will be removed either by conduction or convection across the superposed layer before the initiation of ebullition. Experimental observations of the onset of convective motion in such beds of inductively heated particles have been made. The data for the heat transfer coefficient have been obtained in water-cooled beds of 304 stainless steel particles. The observations show that increasing the depth of the fluid layer over the bed tends to lower the critical internal Rayleigh number at which the onset of convection occurs. For overlying fluid-layer-depth-to-particulate-bed-depth ratios of 1 of greater, natural convection has been observed to begin at RI approximately equal to 12. However, for no fluid layer at the top of the bed, natural convection has been observed to occur at R sub I approximately equal to 45, which is about the same as observed in earlier studies made with Joule heating and no fluid layer at the top of the bed.
Uploads
Papers by Ivan Catton
the model, a Volume Average Technique (VAT) has been applied to the momentum and the energy transport equations for a fluid and a solid phase to develop a specific form of porous media flow equations. The model equations have been solved with the semi-analytical Galerkin method. The detailed velocity and temperature fields in the fluid flow and the solid structure have been obtained. Using the solution fields, the whole-section drag coefficient Cd and the whole-section Nusselt number Nu have been also calculated. To validate the developed solution procedure, the results have been compared to the results of the finite volume method and to the experimental data. The comparison demonstrates an excellent agreement.
the model, a Volume Average Technique (VAT) has been applied to the momentum and the energy transport equations for a fluid and a solid phase to develop a specific form of porous media flow equations. The model equations have been solved with the semi-analytical Galerkin method. The detailed velocity and temperature fields in the fluid flow and the solid structure have been obtained. Using the solution fields, the whole-section drag coefficient Cd and the whole-section Nusselt number Nu have been also calculated. To validate the developed solution procedure, the results have been compared to the results of the finite volume method and to the experimental data. The comparison demonstrates an excellent agreement.