Rafael Gamero - Academia.edu (original) (raw)
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Papers by Rafael Gamero
Nexo, 2006
A study of simultaneous heat and mass transfer in partially saturated capillaries has been perfor... more A study of simultaneous heat and mass transfer in partially saturated capillaries has been performed in order to determine the matrix of multicomponent diffusion coefficients in liquid phase. The literature provides a semi-empirical formula developed by Bandrowski and Kubaczka to calculate the matrix of multicomponent diffusion coefficients. The method separates the kinetic and thermodynamic contributions to mass transfer, and it contains an empirical exponent to improve the calculations. The present work attempts an estimation of the empirical exponent in a broad range of temperatures and liquid compositions by studying the redistribution of compositions in an unsaturated non-isothermal capillary, taking into consideration the non-ideality described by the matrix of thermodynamic factors. For such a purpose, the ternary system water-ethanol-acetone was tested at different temperature gradients and saturation degree. The results reveal that the method is effective since consistent values of the empirical exponent that modifies the matrix of thermodynamic factors were obtained. In addition, the exponent seems to be dependent on temperature.
Liquid Transport during Isothermal Drying of a Capillary Porous Solid Containing Multicomponent L... more Liquid Transport during Isothermal Drying of a Capillary Porous Solid Containing Multicomponent Liquid Mixtures
The Effective Thermal Conductivity in a Solid containing a Liquid Mixture : An Approach from Dryi... more The Effective Thermal Conductivity in a Solid containing a Liquid Mixture : An Approach from Drying Experiments
The convective evaporation of a multicomponent falling liquid film into an inert gas with a co-cu... more The convective evaporation of a multicomponent falling liquid film into an inert gas with a co-current flow arrangement of the phases is studied. Simulations focused on the factors that influence the process controlling mechanisms and selectivity were performed using a mathematical model including liquid-side resistances. In absence of indirect heating, the process controlling steps change from a liquid-side-controlled process to a gasphase-controlled one. Indirect heating makes evaporation less selective, and the process shifts from liquid-phase-controlled conditions to a process, in which neither the gas nor the liquid completely controls evaporation. Considering the evolution of the process controlling steps and its influence on selectivity, a model able to describe the whole evaporation process, must include the coexistence of several mechanisms.
A study of simultaneous heat and mass transfer in partially saturated capillaries has been perfor... more A study of simultaneous heat and mass transfer in partially saturated capillaries has been performed in order to determine the matrix of multicomponent diffusion coefficients in liquid phase. The literature provides a semi-empirical formula developed by Bandrowski and Kubaczka to calculate the matrix of multicomponent diffusion coefficients. The method separates the kinetic and thermodynamic contributions to mass transfer, and it contains an empirical exponent to improve the calculations. The present work attempts an estimation of the empirical exponent in a broad range of temperatures and liquid compositions by studying the redistribution of compositions in an unsaturated non-isothermal capillary, taking into consideration the non-ideality described by the matrix of thermodynamic factors. Two different ternary mixtures were tested at different temperature gradients and saturation degree. The results reveal that the method is effective since specific values of the empirical exponent that modifies the matrix of thermodynamic factors were obtained for each system. In addition, the exponent seems to be dependent on temperature.
Nexo, 2006
A study of simultaneous heat and mass transfer in partially saturated capillaries has been perfor... more A study of simultaneous heat and mass transfer in partially saturated capillaries has been performed in order to determine the matrix of multicomponent diffusion coefficients in liquid phase. The literature provides a semi-empirical formula developed by Bandrowski and Kubaczka to calculate the matrix of multicomponent diffusion coefficients. The method separates the kinetic and thermodynamic contributions to mass transfer, and it contains an empirical exponent to improve the calculations. The present work attempts an estimation of the empirical exponent in a broad range of temperatures and liquid compositions by studying the redistribution of compositions in an unsaturated non-isothermal capillary, taking into consideration the non-ideality described by the matrix of thermodynamic factors. For such a purpose, the ternary system water-ethanol-acetone was tested at different temperature gradients and saturation degree. The results reveal that the method is effective since consistent values of the empirical exponent that modifies the matrix of thermodynamic factors were obtained. In addition, the exponent seems to be dependent on temperature.
Liquid Transport during Isothermal Drying of a Capillary Porous Solid Containing Multicomponent L... more Liquid Transport during Isothermal Drying of a Capillary Porous Solid Containing Multicomponent Liquid Mixtures
The Effective Thermal Conductivity in a Solid containing a Liquid Mixture : An Approach from Dryi... more The Effective Thermal Conductivity in a Solid containing a Liquid Mixture : An Approach from Drying Experiments
The convective evaporation of a multicomponent falling liquid film into an inert gas with a co-cu... more The convective evaporation of a multicomponent falling liquid film into an inert gas with a co-current flow arrangement of the phases is studied. Simulations focused on the factors that influence the process controlling mechanisms and selectivity were performed using a mathematical model including liquid-side resistances. In absence of indirect heating, the process controlling steps change from a liquid-side-controlled process to a gasphase-controlled one. Indirect heating makes evaporation less selective, and the process shifts from liquid-phase-controlled conditions to a process, in which neither the gas nor the liquid completely controls evaporation. Considering the evolution of the process controlling steps and its influence on selectivity, a model able to describe the whole evaporation process, must include the coexistence of several mechanisms.
A study of simultaneous heat and mass transfer in partially saturated capillaries has been perfor... more A study of simultaneous heat and mass transfer in partially saturated capillaries has been performed in order to determine the matrix of multicomponent diffusion coefficients in liquid phase. The literature provides a semi-empirical formula developed by Bandrowski and Kubaczka to calculate the matrix of multicomponent diffusion coefficients. The method separates the kinetic and thermodynamic contributions to mass transfer, and it contains an empirical exponent to improve the calculations. The present work attempts an estimation of the empirical exponent in a broad range of temperatures and liquid compositions by studying the redistribution of compositions in an unsaturated non-isothermal capillary, taking into consideration the non-ideality described by the matrix of thermodynamic factors. Two different ternary mixtures were tested at different temperature gradients and saturation degree. The results reveal that the method is effective since specific values of the empirical exponent that modifies the matrix of thermodynamic factors were obtained for each system. In addition, the exponent seems to be dependent on temperature.