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Papers by Filippo de Monte
Mathematical Problems in Engineering, 2015
Journal of Thermophysics and Heat Transfer, 2016
Proceeding of the 6th International Symposium on Radiative Transfer, 2012
45th AIAA Thermophysics Conference, 2015
ABSTRACT The time duration for processes involving transient thermal diffusion can be a critical ... more ABSTRACT The time duration for processes involving transient thermal diffusion can be a critical piece of information related to thermal processes in engineering applications. Analytical solutions must be used to calculate these types of time durations since the boundary conditions in such cases can be effectively like semi-infinite conditions. This research involves an investigation into analytical solutions for five geometries including one-dimensional cases for Cartesian, cylindrical and spherical coordinates. The fourth case involves two-dimensional conduction from a point heat source on the surface of a slab subjected to insulated boundary conditions elsewhere. The mathematical modeling for this case is done in cylindrical coordinates. The fifth case involves a heated surface on the inside of a hole bored through an infinite body, which is a one-dimensional problem in radial coordinates. A sixth case is also mentioned, which is the only two-dimensional configuration discussed, having to do with point heating on a flat plate. For each geometric configuration, a relationship is developed to determine the time required for a temperature rise to occur at a non-heated point in the body in response to a sudden change at a heated boundary. A range of time values is computed for each configuration based on the amount of temperature rise used as a criterion. Plots are given for each case showing the relationships between the temperature rise of interest and the amount of time required to reach that temperature.
The mass diffusion from a drug-eluting stent to the arterial wall is addressed. The coating layer... more The mass diffusion from a drug-eluting stent to the arterial wall is addressed. The coating layer is described as a porous reservoir where the drug is initially loaded in polymer-encapsulated solid-phase, and then released both to the coating and to the arterial tissue in a liquidphase. The endothelium, intima, internal elastic lamina and media are all treated as homogeneous porous media and the drug transfer through them is modelled by a non-homogeneous set of coupled partial differential equations that describe a local mass non-equilibrium diffusion problem. Drug concentration levels and mass profiles in each layer at various times are computed as a spectral decomposition: numerical results show a delayed release depending on the physico-chemical properties of the polymeric-coated stents.
ABSTRACT First Page of the Article
SAE Technical Paper Series, 1992
Abstract In past studies, authors presented a dynamic analysis for the design and the performance... more Abstract In past studies, authors presented a dynamic analysis for the design and the performance evaluation of free-piston Stirling engines both at nominal and at off-design conditions. In this paper, the analysis is applied in conjunction with an adiabatic reference ...
2008 IEEE International Symposium on Industrial Electronics, 2008
ABSTRACT Planar transformers are a good choice when designing high frequency switching mode power... more ABSTRACT Planar transformers are a good choice when designing high frequency switching mode power supply (SMPS). Since these devices have some advantages over wound transformers that improve the SMPS performances, their use is growing in the last years. One of them is that, due to the planar geometry and proximity of the windings, parasitic effects at high frequency can be reduced. This paper presents a study of two different winding arrangements to compute the electromagnetic loss and the temperature distribution inside the planar transformer. The study is carried out using the finite element analysis and taking into account the frequency effects for the electromagnetic model. A finite element algorithm is also applied to solve the thermal model for the computation of the temperature distribution. An experimental prototype is built and measurements are performed validating the numerical results.
2011 IEEE International Symposium on Industrial Electronics, 2011
ABSTRACT In high frequency planar transformers and induc- tors, conventional wires have been repl... more ABSTRACT In high frequency planar transformers and induc- tors, conventional wires have been replaced by printed circuit boards or laminated copper windings. This technology can outperform traditional wire-wound transformers in terms of cost, dimensions and performance. However, in order to obtain high efficiency and high power/size ratio, their design requires the knowledge of the internal temperature distribution. For such a reason, this paper proposes a two-dimensional numerical method for a combined computation of both the temperature distribution and the electromagnetic behaviour of planar transformers and inductors. After a detailed description of the proposed method- ology, this paper reports, compares and analyzes calculated and measured results demonstrating prediction capabilities of the proposed method.
One of the most promising frontiers of bioengineering is the controlled release of a therapeutic ... more One of the most promising frontiers of bioengineering is the controlled release of a therapeutic drug from a vehicle across the skin (transdermal drug delivery). In order to study the complete process, a multiphase mathematical model describing the dynamics of a substance between two porous coupled media of different properties and extents is presented. A system of partial differential equation describes the diffusion and the reversible binding and unbinding processes in both layers. Additional flux continuity at the interface and clearance conditions into systemic circulation are imposed. A Sturm-Liouville problem is solved and an analytical solution is given in the form of an infinite series expansion. The model points out the role of the diffusion and reaction parameters, which control the complex transfer mechanism and the drug kinetics across the two layers. Drug mass are given and their dependence on the physical parameters are discussed.
Energy Conversion Engineering Intersociety Conference, 1996
In this work a new linearisation technique of the dynamic balance equations of a free-piston Stir... more In this work a new linearisation technique of the dynamic balance equations of a free-piston Stirling machine is developed. It takes into account the nonlinear thermo-fluid-dynamic terms inherent in the machine, although keeping the linearity of the differential dynamic equations. This allows the equations of motion to be solved analytically and, therefore, useful algebraic relations (already established by the authors
IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference, 1996
A closed form-expression for the effectiveness of the heat exchangers and regenerator of a Stirli... more A closed form-expression for the effectiveness of the heat exchangers and regenerator of a Stirling cycle machine is given. This result may be used in a simple way in order to evaluate their effect on the machine performance. The proposed method, indeed, allows the actual cycle gas temperatures in the heater and cooler to be obtained readily, once the geometry
Heat Transfer and Fluid Flow in Biological Processes, 2015
Nomenclature c concentration (kg m À3 ) C uniform initial concentration (kg m À3 ) D effective di... more Nomenclature c concentration (kg m À3 ) C uniform initial concentration (kg m À3 ) D effective diffusivity of the drug in the vehicle or skin (m 2 s À1 ) J mass flux due to a concentration gradient (kg s À1 m À2 ) k partition coefficient (dimensionless) k P tissue permeability (m s À1 ) K skin/capillary clearance coefficient (m s À1 ) l thickness (m) M mass per unit of area (kg m À2 ) P mass transfer coefficient (m s À1 ) t time (s) 273
Transport in Biological Media, 2013
Mathematical Problems in Engineering, 2015
Journal of Thermophysics and Heat Transfer, 2016
Proceeding of the 6th International Symposium on Radiative Transfer, 2012
45th AIAA Thermophysics Conference, 2015
ABSTRACT The time duration for processes involving transient thermal diffusion can be a critical ... more ABSTRACT The time duration for processes involving transient thermal diffusion can be a critical piece of information related to thermal processes in engineering applications. Analytical solutions must be used to calculate these types of time durations since the boundary conditions in such cases can be effectively like semi-infinite conditions. This research involves an investigation into analytical solutions for five geometries including one-dimensional cases for Cartesian, cylindrical and spherical coordinates. The fourth case involves two-dimensional conduction from a point heat source on the surface of a slab subjected to insulated boundary conditions elsewhere. The mathematical modeling for this case is done in cylindrical coordinates. The fifth case involves a heated surface on the inside of a hole bored through an infinite body, which is a one-dimensional problem in radial coordinates. A sixth case is also mentioned, which is the only two-dimensional configuration discussed, having to do with point heating on a flat plate. For each geometric configuration, a relationship is developed to determine the time required for a temperature rise to occur at a non-heated point in the body in response to a sudden change at a heated boundary. A range of time values is computed for each configuration based on the amount of temperature rise used as a criterion. Plots are given for each case showing the relationships between the temperature rise of interest and the amount of time required to reach that temperature.
The mass diffusion from a drug-eluting stent to the arterial wall is addressed. The coating layer... more The mass diffusion from a drug-eluting stent to the arterial wall is addressed. The coating layer is described as a porous reservoir where the drug is initially loaded in polymer-encapsulated solid-phase, and then released both to the coating and to the arterial tissue in a liquidphase. The endothelium, intima, internal elastic lamina and media are all treated as homogeneous porous media and the drug transfer through them is modelled by a non-homogeneous set of coupled partial differential equations that describe a local mass non-equilibrium diffusion problem. Drug concentration levels and mass profiles in each layer at various times are computed as a spectral decomposition: numerical results show a delayed release depending on the physico-chemical properties of the polymeric-coated stents.
ABSTRACT First Page of the Article
SAE Technical Paper Series, 1992
Abstract In past studies, authors presented a dynamic analysis for the design and the performance... more Abstract In past studies, authors presented a dynamic analysis for the design and the performance evaluation of free-piston Stirling engines both at nominal and at off-design conditions. In this paper, the analysis is applied in conjunction with an adiabatic reference ...
2008 IEEE International Symposium on Industrial Electronics, 2008
ABSTRACT Planar transformers are a good choice when designing high frequency switching mode power... more ABSTRACT Planar transformers are a good choice when designing high frequency switching mode power supply (SMPS). Since these devices have some advantages over wound transformers that improve the SMPS performances, their use is growing in the last years. One of them is that, due to the planar geometry and proximity of the windings, parasitic effects at high frequency can be reduced. This paper presents a study of two different winding arrangements to compute the electromagnetic loss and the temperature distribution inside the planar transformer. The study is carried out using the finite element analysis and taking into account the frequency effects for the electromagnetic model. A finite element algorithm is also applied to solve the thermal model for the computation of the temperature distribution. An experimental prototype is built and measurements are performed validating the numerical results.
2011 IEEE International Symposium on Industrial Electronics, 2011
ABSTRACT In high frequency planar transformers and induc- tors, conventional wires have been repl... more ABSTRACT In high frequency planar transformers and induc- tors, conventional wires have been replaced by printed circuit boards or laminated copper windings. This technology can outperform traditional wire-wound transformers in terms of cost, dimensions and performance. However, in order to obtain high efficiency and high power/size ratio, their design requires the knowledge of the internal temperature distribution. For such a reason, this paper proposes a two-dimensional numerical method for a combined computation of both the temperature distribution and the electromagnetic behaviour of planar transformers and inductors. After a detailed description of the proposed method- ology, this paper reports, compares and analyzes calculated and measured results demonstrating prediction capabilities of the proposed method.
One of the most promising frontiers of bioengineering is the controlled release of a therapeutic ... more One of the most promising frontiers of bioengineering is the controlled release of a therapeutic drug from a vehicle across the skin (transdermal drug delivery). In order to study the complete process, a multiphase mathematical model describing the dynamics of a substance between two porous coupled media of different properties and extents is presented. A system of partial differential equation describes the diffusion and the reversible binding and unbinding processes in both layers. Additional flux continuity at the interface and clearance conditions into systemic circulation are imposed. A Sturm-Liouville problem is solved and an analytical solution is given in the form of an infinite series expansion. The model points out the role of the diffusion and reaction parameters, which control the complex transfer mechanism and the drug kinetics across the two layers. Drug mass are given and their dependence on the physical parameters are discussed.
Energy Conversion Engineering Intersociety Conference, 1996
In this work a new linearisation technique of the dynamic balance equations of a free-piston Stir... more In this work a new linearisation technique of the dynamic balance equations of a free-piston Stirling machine is developed. It takes into account the nonlinear thermo-fluid-dynamic terms inherent in the machine, although keeping the linearity of the differential dynamic equations. This allows the equations of motion to be solved analytically and, therefore, useful algebraic relations (already established by the authors
IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference, 1996
A closed form-expression for the effectiveness of the heat exchangers and regenerator of a Stirli... more A closed form-expression for the effectiveness of the heat exchangers and regenerator of a Stirling cycle machine is given. This result may be used in a simple way in order to evaluate their effect on the machine performance. The proposed method, indeed, allows the actual cycle gas temperatures in the heater and cooler to be obtained readily, once the geometry
Heat Transfer and Fluid Flow in Biological Processes, 2015
Nomenclature c concentration (kg m À3 ) C uniform initial concentration (kg m À3 ) D effective di... more Nomenclature c concentration (kg m À3 ) C uniform initial concentration (kg m À3 ) D effective diffusivity of the drug in the vehicle or skin (m 2 s À1 ) J mass flux due to a concentration gradient (kg s À1 m À2 ) k partition coefficient (dimensionless) k P tissue permeability (m s À1 ) K skin/capillary clearance coefficient (m s À1 ) l thickness (m) M mass per unit of area (kg m À2 ) P mass transfer coefficient (m s À1 ) t time (s) 273
Transport in Biological Media, 2013