210 documents found, page 1 of 21
Constructal Pathway of Particle Dispersion in Children’s Respiratory Dynamics
Pepe, V.R.; Miguel, A. F.; Zinani, F.; Rocha, L.A.O.In this work, Constructal Design maximizes access to aerosol particles incorporated into the respiratory airflow flowing along a dichotomous structure with three levels of branching. The objective is to determine the combination of particle size and density that provides the best deposition performance, under size constraints, in three-dimensional (3D) networks with a homothetic relationship between the diamete...
Dendritic flow networks: the link between patterns and design with purpose in b...
Miguel, A. F.; Lorente, S.This study presents a comprehensive methodology, based on physics laws, for predicting the architecture of symmetric and asymmetric dendritic flow networks. These flow networks, found in vascular systems and respiratory trees, exhibit prefractal patterns that can be described by using recursive processes based on the concept of self-similarity, and the definition of a dimension that represents the degree of the...
Editorial: New Trends and Advances in Fluid Flow and Heat Transfer
Miguel, A. F.; Rocha, L.A; Öchsner, A.Fluid flow and heat transfer are key concepts in many areas of natural science and engineering. Advances in these fields are critical in the design, analysis, and optimisation of a wide range of systems and processes, with applications ranging from power production, environmental engineering, renewable energy, and energy efficiency, to medical applications, and so on. A broad range of research is covered by flu...
An investigation of pedestrian dynamics based on fluid mechanics dimensionless ...
Miguel, A. F.The study of pedestrian dynamics, both individually and in groups, has been a highly active field for the last few decades. Dimensionless numbers in fluid dynamics are used to characterize flow patterns, identify the dominant forces, and predict results. Here, we argue that these dimensionless numbers can be also relevant to obtaining basic features of pedestrian dynamics. In this study, pedestrians moving free...
Fluid flow in isomeric constructal networks of tubes
Pepe, V. R; Miguel, A. F.; Zinani, F.; Rocha, L. A. O.The branching topology of tree networks has a considerable influence on the distribution of fluid flow inside them. Fluid flow asymmetry (an unequal distribution of fluid flow between the daughter tubes) can arise in geometrically symmetric branches. It is important to be able to pinpoint the reason for this, which is still not fully understood. This study compares tree flow network designs with the same number...
Low dissipative configuration in flow networks subject to constraints
Miguel, A. F.The homothetic relationships for the design of dendritic networks are examined in terms of minimal size under constant flow resistance, and minimum flow resistance under constant size. Based on a comprehensive methodology, we offer a general approach for the homothety ratios of diameters and lengths that apply to different flow regimes and size constraints. In addition, scaling laws for diameters-lengths, size...
Obstructed Branching Networks: A Constructal Approach in Fluid Flow Investigation
Pepe, V. R.; Miguel, A. F.; Zinani, F. S.; Rocha, L. A. O.Tree flow networks are common in both natural and manufactured systems. The organization of the flow hierarchy passes through the dimensional evolution of the form that is linked to the function. Thus, the objective of comparing bifurcated tube networks obtained by the constructaldesign method, where part of the structure is obstructed, aims to understand the effects on fluid flow and the prediction of evolutio...
Addressing the effect of hole design on the performance of perforated plates
Miguel, A. F.Perforated plates have been used in a variety of applications for many years. Shading panels [1], sound absorption [2], separators and filters [3], heat exchangers [4], and applications requiring homogeneous flows [5] are just a few examples. Homogeneous flows are critical for climatization of enclosures and cooling purposes such as gas turbine blades. This ensures that the fluid is distributed evenly, and in c...
A constructal hemodynamic study of bypass grafts with size constraint
Chen, S.; Miguel, A. F.; Aydin, M.A blood vessel bypass is a common way to restore blood flow due to blocked or narrowed arteries allowing oxygen-rich blood to be routed to the tissues. Herein, using a three-dimensional numerical simulation, the response of various vessel bypass designs to blood flow under size-limiting constraints is explored and compared to the flow in healthy arteries. Finding the best design requires a size constraint in th...
Micro-Mechatronic Engineering.
Zhou, Teng; Miguel, A. F.This special issue includes high-quality papers presented at ICFPMCE 2023 regarding micro-mechatronic engineering. This issue consists of 5 articles covering the following areas micro/nano-fluidics, fluid power research,fluid–solid coupling and energy saving and environmental protection.