Examinando por Materia "Drops"

Mostrando 1 - 2 de 2
  • No hay miniatura disponible
    Ítem
    Prediction of a flying droplet landing over a non-flat substrates for ink-jet applications
    (Springer-Verlag France, 2019-01-01) Arango I.; Bonil L.; Posada D.; Arcila J.; Arango I.; Bonil L.; Posada D.; Arcila J.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    Printing with inkjet technology has found new forms of application in the industry and in this article we study this technology focused on printing on non-flat surfaces. Since there is no print history over distances greater than 1 mm due to the rupture phenomenon, an initial quality standard is defined to measure achievements in a relative manner. An interactive method is used that requires the user to approach the machine in multiple analyzes of different types. The first approach is a mathematical model this model was constructed to predict the drop distance of the drop in the non-planar substrate with respect to the planned one in the flat substrate, taking into account that most of the drops fall to different heights presenting a greater or lesser state of development the phenomena present in the flight. The results allow to initiate a process of compensation that avoids the distortion of the figure to improve the printing resolution. The results are validated using a relative quality through industrial ink-jet printer with heads capable of injecting functional fluids. The initial result indicates that in standard surface printing with print relative quality already defined, it can be used only for low resolution formats with thick lines, and the result can be improved when the original figure is treated by compensating the distance between the numerical prediction and the initial objective. © 2019, Springer-Verlag France SAS, part of Springer Nature.
  • No hay miniatura disponible
    Ítem
    Thermal and permeability properties of metal Aluminum foams for functional applications
    (Pontificia Universidad Javeriana, 2017-01-01) Fernández-Morales, P.; Cano-Montoya, C.A.; Pérez-Mesa, J.A.; Navacerrada, M.Á.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
    To determine the coefficients of permeability and thermal conductivity of aluminum metal foams, thermal transference and pressure drop tests were carried out. Metal foam samples measuring 50 mm in diameter and 20 mm in thickness with pore sizes ranging between 0.5 and 2.0 mm were used for both tests. An adaptation in a fluid flow system was made to perform the pressure drop tests, and Darcy’s law was used to calculate the permeability values. A thermal box test and Fourier’s law were used to obtain the conductivity coefficients. The results showed that the pore size has an important influence on the values of permeability and thermal conductivity. Finally, the results were compared with those reported by other researchers and were found to be consistent with those found in previous work. Our interest is to enhance knowledge regarding aluminum metal foams and show their potential use in applications that involve fluid flow and heat transfer. © 2017, Pontificia Universidad Javeriana. All rights reserved.