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In this work, the permeability property of porous scaffolds, made of polylactic acid by 3D printing using the fused deposition method (FDM), is characterized from the mathematical-statistical modeling of the relationship between porosity and permeability. The scaffolds were designed with internal morphology of triply periodic minimal surfaces of the Schwarz Diamond, Gyroid and Primitive types with three levels of porosity: 50, 60 and 70 %. Manufacturing was carried out on the commercial Wanhao 6D printer. The permeability measurement was performed in an experimental setup that complies with Darcy's law. The results for each structure fit a quadratic polynomial with a correlation coefficient greater than 98% for all cases. The normality and homoscedasticity tests indicate the relevance of the models. [ABSTRACT FROM AUTHOR]

The primary objective of this research study was to develop a strategy to examine a key topic of fluid mechanics for undergraduate education by using a theoretical-experimental-computational approach. The key topic examined covered topics from Bernoulli's extended equation, specifically, for calculating head losses in pipelines under turbulent flow conditions. The contribution of the computational approach was appropriate due to the observable reduction in both tedious calculations and optimization time for educational laboratory purposes. The most relevant result was the verification, in a university environment, of trends predicted by theory and experimental results. They correlated in a modified Moody diagram: the Reynolds number, relative roughness, and the Darcy friction factor. In conclusion, the test series showed the advantages and disadvantages of conducting real observations and controlled measurements while performing theoretical analyses. [ABSTRACT FROM AUTHOR]

Copyright of Larhyss Journal is the property of Biskra University, Research Laboratory in Subterranean & Surface Hydraulics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Flow behavior through porous media with parallel boundaries has been widely studied in the last five decades. Nevertheless, only few studies have been reported about flow behavior through porous media with converging boundaries, even less when flow does not obey Darcy's law. This work is based on experimental results through a convergent flow permeameter published by other authors recently. They concluded that the Forchheimer equation parameters change in converging flow. The objective here is to study non-Darcy steady converging flow and to show the validity of the Forchheimer equation under these flow conditions. An excellent graphical adjustment is obtained for different width ratios when all values of sections on the plane convergent model are used. This result shows that linear and non-linear parameters of a homogeneous porous media have one value not depending on flow conditions. [ABSTRACT FROM AUTHOR]

Starting from the linear Oldroyd-B model, a generalized Darcy's Law is obtained in the frequency domain and an explicit expression for the dynamic permeability is given. Previous results in viscoelastic and Newtonian fluids are shown here to be particular cases of our generalized law. Different features of the velocity field generated by harmonic pressure gradients are also discussed, as well as the compressibility effects on the propagation of sound waves. [ABSTRACT FROM AUTHOR]

Hydraulic conductivity depends on the exponent of the gradient in the exponential flow equation in porous media, aspect that has limited the employment of this flow equation. By using an excellent correlation between the quotient of two gradients (the hydraulic gradient and the critical Darcy gradient) and the exponent of the gradient in the exponential law, the critical Darcy gradient can be easily obtained. Also, the use of a general relationship between the hydraulic conductivity and the one given by Darcy, makes it possible to obtain the aquifer Darcy's transmisivity. The proposed handling is illustrated by the determination of hydrogeological properties for one sector of Camagüey South coastal aquifer, specifically by Macurijes test. The results obtained have being validated with the classical expressions based on the binomial law. [ABSTRACT FROM AUTHOR]

Copyright of Ingeniería Hidráulica en México is the property of Instituto Mexicano de Tecnologia del Agua (IMTA) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ingeniería Hidráulica en México is the property of Instituto Mexicano de Tecnologia del Agua (IMTA) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)