Carlos Salinas

University of Bío-Bío | UBB · Department of Mechanical Engineering

New experimental data is presented for the mechano-sorptive coefficient of Eucalyptus nitens wood analyzed in the longitudinal direction through the principle of total deformation superposition. The procedure was based on the determination of the partial strain components: elastic strain, free shrinkage strain, and mechano-sorptive strain. The meth...

A treatment is proposed to sanitize wood for export packaging using radio frequency equipment that is capable of treating wood. This was achieved by optimizing the sanitization process and developing an equation to predict the total sanitization time. Statistical analysis determined that the separation of plates and the power density of the equipme...

This work presents a predictive transient two-dimensional model describing the evolution of heat, mass and mechanical stresses during wood dehydration inside an experimental drying chamber. The history of the distributions of moisture content and temperature and the effects produced by its gradients on the stresses were simultaneously modeled. The...

This article presents the mechanical responses of Pinus radiata wood that was impregnated with octadecane to obtain a shape-stabilized phase change material (PCM). PCMs are used as heat storage materials to reduce the temperature peaks and displace the thermal loads in an enclosed space. It is important to study the effect of PCMs on the mechanical...

Wood drying is an important process for adding value and manufacturing innovative products. Eucalyptus nitens wood is inherently difficult to dry because of its natural propensity for checking as well as collapse and shrinkage. Lumber recovery after industrial drying of eucalypts is also very low. This study measured the wood quality of E. nitens j...

The incorporation of phase change materials (PCM) in construction components has become an alternative to reduce the effect of thermal loads in buildings with low thermal inertia. This study put together the effective heat storage capacity of an organic phase change material (O-PCM, octadecane) with the construction and production potential of Pinu...

In this work, a two-dimensional mathematical model of the moisture transport and stress–strain phenomena during the conventional drying process of Eucalyptus nitens wood is presented. The model consists of a system of partial differential nonlinear second-order equations, where the moisture transport phenomenon is modeled on the concept of effectiv...

In this study, the effects of the wood quality used for thermal modification on the physical and mechanical properties obtained at two treatment temperatures commonly used at the industrial level were evaluated in order to validate experimentally the pilot scale process for its future industrial scaling. The quality of the input radiata pine refers...

Laboratory scale experiments are performed in order to characterize the artificial wood drying of Pinus radiata at conventional temperatures and accelerated temperatures. The experimental data allow determining the wood thermal conductivity through inverse methodology. The comparative analysis shows that the implementation of the developed inverse...

This paper reports on the properties of Pinus radiata wood impregnated with an organic phase change material (O-PCM). The tests are aimed at characterizing the kinetics of impregnation (rates, flows, and fronts) and the thermophysical properties (thermal conductivity and specific heat). In particular, a paraffin type O-PCM (octadecane) is used to i...

Steam treatment was used in this work to correct the observed warp in dried core-wood radiata pine (Pinus radiata) lumber that appears during the industrial drying process at high temperatures. The experimental design considered seven tests and three process variables: temperature, overload, and treatment time. The warp and moisture content before...

Chile exhibits a continuous growth of energy demand, and for this reason energy saving approaches in the commercial, public, and residential sectors, which share 21% of the final energy consumption in Chile, have been encouraged. One of the solutions to increase energy savings in buildings and dwellings is to increase the thermal performance of the...

Numerical prediction of heat transfer by natural convection of a Herschel-Bulkley non-Newtonian fluid inside a square cavity has been computationally analyzed. Unsteady 2D fluid mechanics and heat transfer were described in terms of the non-linear coupled continuity, momentum and heat equations. These equations were solved by the control volume fin...

The present work studied the numerical modelling of heat transfer in a pile of Pinus radiata samples of a square cross-section by using radio frequency heating. More precisely, the study focused on the effects of the energy transferred to a dielectric material (wood) from an electromagnetic field, which required the calculation of the dielectric lo...

The objective of this work was to simulate the stresses produced during the drying of Eucalyptus nitens wood due to variations in the moisture content. The methodology involved experimental determination and simulation of drying stresses caused by the development of internal moisture content gradients. Modeling of the moisture transport was based o...

In this work the total heating time was studied using radio frequency to sterilize wood packaging material of Pinus radiata, through the conditions 56 ° C and 60 ° C for 30 and 1 minutes respectively, according to international phytosanitary norms. The experimental tests were carried out in a laboratory radiofrequency equipment of 3 m3 capacity. Th...

In order to evaluate evolution of physical and mechanical properties due to drying and heat modification, a load of radiata pine wood was selected and properties were measured after each drying process. The results revealed interesting correlations between intrinsic factors and properties; the values of density were highly dispersed after drying or...

The purpose of this paper was to determine the mechano-sorptive strains produced during desorption of moisture from Eucalyptus nitens specimens, from a perspective of modeling wood drying stresses. Eucalyptus nitens samples were tested in the radial and tangential directions. The mechano-sorptive strain was measured by cantilever bending during des...

Collapse and drying stresses are currently induced during the drying of Eucalyptus nitens in solid wood products. The purpose of this study was to investigate these drying stresses by measuring hygromechanical strains during the drying of Eucalyptus nitens boards. Small samples of Eucalyptus nitens wood were oriented in the radial and tangential d...

This paper describes one of a series of studies carried out at the University of Bio-Bio in Chile with the objective of characterizing the response of Eucalyptus nitens to drying. The ultimate goal is to minimize collapse and internal intra-ring checking in the industrial drying of Eucalyptus nitens, which currently prevents the lumber manufacturin...

The drying of solid wood and associated stresses are simulated by applying the Control Volume Finite Element Method (CVFEM) in a transversal section of solid wood on the radial/tangential plane. The transport of moisture content and stresses produced by its gradients associated with the phenomena of shrinkage and mechanical sorption were modeled si...

This article reports an experimental and numeric methodology for studying the development of internal stresses during drying of solid wood. For validation purposes, tests were performed for drying of radiata pine at the equivalent of constant air-drying conditions at 44°C dry-bulb and 36°C wet-bulb temperatures. The methodology involves the simulat...

Collapse is almost certain to occur in the industrial drying of Eucalyptus nitens and, as such this prevents the lumber manufacturing industry in Chile from producing commercial solid wood products from this species. This problem is still unsolved, and different studies to reduce collapse are currently underway. In this exploratory study, shrinkage...

A new method based on volume of fluid for interface tracking in the simulation of injection molding is presented. The proposed method is comprised of two main stages: accumulation and distribution of the volume fraction. In the first stage the equation for the volume fraction with a noninterfacial flux condition is solved. In the second stage the a...

Canelo wood is a highly valued native species in Chile that shows delicate marbling patterns with a pinkish soft silver luster. Due to its decorative qualities, canelo wood is dried for the manufacture of furniture and musical instruments. However, canelo wood lacks vessels cells that typically transport the water in hardwoods. Per its drying behav...

The objective of this study was to test a new in-kiln sensor for monitoring lumber moisture content during industrial drying. The theoretical foundation of the technology was already known, because it is based on electrical conductivity, but the mechanism of implementation was new and required validation. For this reason, the technology was compare...

The objective of the present work was to simulate three-dimensional drying of wood, based on the concept of the effective diffusion coefficient. For this, we used a conventional drying process of radiata pine in a controlled environment (dry and wet bulb temperatures of 44 and 36 degrees C, respectively). This experiment allowed us to gather data o...

We modeled conventional two-dimensional drying of radiata pine (Pinus radiata) wood using the concept of effective diffusion extended to overall drying process. Effective diffusion coefficients were determined experimentally on the transversal plane and depended exponentially on the moisture content. These coefficients were characterized by two par...

This article reports the results of an exploratory study designed to reduce heat and electricity consumption in industrial drying of radiata pine. The experiments were performed with slight modifications of the standard drying schedules used by the sawmill to dry radiata pine in 100-m3 industrial kilns. The heat and electricity consumption were det...

We modeled conventional onedimensional drying of radiata pine (Pinus radiata) wood using the concept of effective diffusion. The experimentally determined effective diffusion coefficients for the radial and tangential directions were related exponentially to the moisture content. These coefficients were characterized by two parameters that were det...

The main objective of the present work is the development of an original two-dimensional numerical simulation of wood drying, based on the water potential concept using the Control Volume Finite Element Method (CVFEM). The mathematical model was based on a set of non-linear second partial differential equations, which were solved by a numerical pro...

El objetivo de este trabajo es el de simular esfuerzos bidimensionales de secado usando el método de volúmenes de control conformado por elementos finitos (CVFEM). Se modelan esfuerzos de secado en una sección transversal de madera sólida, producidos por gradientes de humedad asociados a los fenómenos de contracción y sorción mecánica. En particula...

The work was aimed at simulating two-dimensional wood drying stress using the control-volume finite element method (CVFEM). Stress/strain was modeled by moisture content gradients regarding shrinkage and mechanical sorption in a cross-section of wood. CVFEM was implemented with triangular finite elements and lineal interpolation of the independent...

The drying of solid wood and associated stresses were simulated by applying the Control Volume Finite Element Method (CVFEM) to a transversal section of solid wood on the radial/ tangential plane. The transport of moisture content and stresses produced by its gradients associated with the phenomena of shrinkage and mechanical sorption were modeled...

La figura 2 muestra el resultados tridimensionales, experimentales y numéricos, de secado de madera sólida de pino radiata. El particular, se muestra un esquema del equipo experimental, subdivisión de la muestra , distribuciones de contenidos de humedad y curvas de secado. La figura 3 muestras simulaciones tridimensionales de flujo, con detalles de...

A phenomenological model was used to quantify the drying process of Chilean coigüe (Nothofagus dombeyi). This model is based on an overall mass-transfer coefficient, K, which was determined in four laboratory drying runs. The model suitably described the drying of Chilean coigüe lumber of 19- and 30-mm thickness, with K ranging from 0.012 to 0.021...

Experiments at industrial scale to show the high temperature wood drying of radiate pine were performed. After that, physical parameters of transport phenomena (global heat and mass transfer co- effi cients), required by the phenomenological mathematical models for the simulation of the drying process, were determined. Results of global heat transf...

The present work is related to the simulation of hot gases inside a tubular combustion chamber. This way, meshes are generated in tubular curvilinear domains. The fuel injection is carried out through a spherical body positioned in the chamber symmetry axis, affected by an axial primary flow and a radial secondary flow. The fluid is considered Newt...

The objective of the present work is to develop a numerical model to analyze the melting solidification process considering the natural convection phenomena to alloy aluminum in a square section. Physical medium is taken as incompressible Newtonian fluid with isotropy thermal properties where the heat is transferred by conduction and convection, in...

Article CITATIONS 0 READS 28 2 authors: Some of the authors of this publication are also working on these related projects: Procedimiento para esterilización con calor por radiofrecuencia de maderas". Proyecto Fondef-Idea 2-Etapas ID14I10231. 2015-2016 View project Diseño de un secador de madera para la pequeña y mediana empresa basado en el uso ef...

The drying kinetic during conventional temperature drying and vacuum drying of radiata pine (Pinus radiata D. Don) was studied. The evolution of the wood moisture content based on the calculation of a global drying coefficient was analyzed. In vacuum drying the drying rate was explored and a characteristic drying curve was determined. The lumber us...

SUMMARY The present work says relationship with the two-dimensional numerical model of the wood drying kinetics based on the water potential concept. The mathematical model is based on a set of non-linear second partial differential equations, which is solved by a numerical procedure using the Finite Volume Method in a generalized coordinates syste...

A one-dimensional phenomenological wood drying model is used to describe the conventional drying kinetic of Chilean coigüe Nothofagus dombeyi. The model is based on a global mass transfer coefficient (Kx), it consists of a system of four 1st order coupled partial differential equations and is finite differenced and solved like a initial value probl...

A one-dimensional phenomenological wood drying model is used to describe the conventional drying kinetic of Chilean coigüe Nothofagus dombeyi. The model is based on a global mass transfer coefficient (Kx), it consists of a system of four 1st order coupled partial differential equations and is finite differenced and solved like a initial value probl...

The objective of the present work is to develop a numerical model to analyze melting solidification process considering the natural convection phenomena to an alloy metal in a square section. Physical medium is taken as incompressible Newtonian fluid with isotropy thermal properties where the heat is transferred by conduction and convection, includ...

A one-dimensional phenomenological model for low temperature (T ≤80 °C) wood drying process based in the global drying coefficient curve is described. Transient numerical values of moisture content and temperature in wood and ambient air conditions were found to agree with results described in the literature. The Chilean coigüe Nothofagus dombeyi w...

A numerical study for the conjugate analysis of unsteady natural convection and solidification during freezing of a rectangular food is presented. The SIMPLER finite volume method, with a nonuniform grid of 1575 nodes and nondimensional time steps of 2.5 = 10-4 was used to solve continuity, linear momentum, and energy equations for 104 <Ra <106. Th...

A numerical study for the conjugate analysis of unsteady natural convection and solidification during freezing of a rectangular food is presented. The SIMPLER finite volume method, with a nonuniform grid of 1575 nodes and nondimensional time steps of 2.5 = 10-4 was used to solve continuity, linear momentum, and energy equations for 1046. The effect...

Conjugate forced convection in air and heat conduction with solidification of water content in food freezing is predicted. Continuity, linear momentum and energy equations are solved to predict the fluid dynamics and heat transfer around the food. Solidification of water is calculated by using a temperature dependent apparent specific heat. The met...

The objective of this paper is to describe the fluid mechanics and heat transfer in the freezing process of a plate-shaped portion of salmon meat inside a refrigeration chamber. Forced convection from the food to the air is calculated from continuity, linear momentum, and energy equations conjugated to the heat conduction with liquid-solid phase tr...

The objective of this paper is to describe the fluid mechanics and heat transfer in the freezing process of a plate-shaped portion of salmon meat inside a refrigeration chamber. Forced convection from the food to the air is calculated from continuity, linear momentum, and energy equations conjugated to the heat conduction with liquid-solid phase tr...

. The objective of this paper is to describe the fluid mechanics and heat transfer in the freezing process of a plate shaped portion of salmon meat inside a refrigeration chamber. Forced convection from the food to the air is calculated from continuity, Navier-Stokes and energy equations coupled to the heat conduction with liquid-solid phase transf...

Navier-Stokes. Se consideran condiciones de continuidad de primer y segundo orden en la interface sólido/fluido y se incorporan en forma linear los efectos del gradiente de concentraciones y/o las variaciones de densidad. El modelo matemático es resuelto numéricamente a través del Método de Volúmenes Finitos descrito en coordenadas curvilíneas y va...

The present work is related to the simulation of hot gases inside a tubular combustion chamber. This way, meshes are generated in tubular curvilinear domains. The fuel injection is carried out through a spherical body positioned in the chamber symmetry axis, affected by an axial primary flow and a radial secondary flow. The fluid is considered Newt...