On the estimation of three-dimensional porosity of insect-proof screens

Granados-Ortiz, Francisco-Javier; Arrabal-Campos, Francisco M.; López-Martínez, Alejandro; Molina-Aiz, F.D.; Peña, Araceli; Valera, D.L.

doi:10.1016/j.compag.2021.106639

Cited by 5 publications

(7 citation statements)

References 46 publications

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“…There may be scenarios in which two screens with equal two-dimensional geometric parameters, when compared to three-dimensional geometric parameters, are actually different. For instance, two IPSs that have the same twodimensional porosity but different thicknesses may have a different effect on the airflow through them, since they present different three-dimensional porosity characteristics [17]. Thus, the conclusion is that the real porosity (three-dimensional) is not the same between these two IPSs, and thus the performance cannot be the same, as always considered in previous literature.…”

Section: Modelling Resultsmentioning

confidence: 88%

“…The subscript i = x, y is used to differentiate the warp and weft threads by their coordinates (see Figure 2). All the dimensions are relatable by trigonometric relations, not shown in this work for the sake of simplicity, but we suggest the reader to see [17] for further details. By solving the non-linear set of Equations ( 9)-( 13), Equation ( 8) can be further developed.…”

Section: Insect-proof Screen Model and Estimation Of 3d Porositymentioning

confidence: 99%

“…Equation ( 14) represents a function to connect all the required geometric parameters to know the volumetric porosity analytically. Although there are few softwares out there to obtain certain geometric characteristics of the screens and their two-dimensional porosity [14], the only software in the literature to obtain the three-dimensional porosity is Poro3D v1.0 [16]. From certain geometric inputs, this software estimates the volumetric porosity of screens, as well as the 3D representation of the interlaced threads, as shown in Figure 1.…”

Section: Insect-proof Screen Model and Estimation Of 3d Porositymentioning

confidence: 99%

“…Despite the strong interest on these parameters to classify screens, this two-dimensional characterization is insufficient, since IPSs are three-dimensional structures. For this reason, we recently released an innovative software [16,17] that allows, from the two-dimensional parameters mentioned above plus the measurement of the thickness of the IPS (e), to reconstruct the geometry of the IPS in three-dimensions. The software is also able to accurately calculate the 3D volumetric porosity (φ 3D ) [17], a parameter never considered before, due to the complexity in its analytical modelling.…”

Section: Introductionmentioning

confidence: 99%

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Improvements in the Characterisation of Permeability and Inertial Factor of Insect-Proof Screens through Pressure Drop Coefficients

et al. 2023

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Permeability and inertial factor are the most relevant variables in the Forchheimer equation. They are important to estimate pressure drop when a fluid flow is passing through a porous media. However, in the insect-proof screens field, the existing models to date are still providing a poor predictive accuracy, in part due to they are based on 2D porosity of screens. This work provides novel models for permeability and inertial factor, which are developed from experimental data of insect-proof screens in a wind tunnel and the analytical estimation of 3D porosity. Instead of fitting models directly on observed training data values of permeability and inertial factor, we propose to focus the modelling efforts on finding models dependent on the 3D porosity through the constants in the pressure drop of Forchheimer equation. Since two screens can have the same 2D porosity but different 3D porosity, this makes also models more reliable. The combination of all these aspects has led to parametric models that overcome by far predictions by previous models in the literature.

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Section: Modelling Resultsmentioning

confidence: 88%

Section: Insect-proof Screen Model and Estimation Of 3d Porositymentioning

confidence: 99%

Section: Insect-proof Screen Model and Estimation Of 3d Porositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvements in the Characterisation of Permeability and Inertial Factor of Insect-Proof Screens through Pressure Drop Coefficients

et al. 2023

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“…with parameters of interest for ventilation, such as permeability, inertia factor, and pressure drop coefficient. To overcome the ambiguity of the characterization of porosity as a 2D measure, which does not take into account the thickness of screens, Granados-Ortiz et al [26] developed a mathematical approach to characterize a three-dimensional porosity (volumetric porosity) as a more complete and accurate estimation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

et al. 2022

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Insect-proof screens are a frequent passive method to restrict the entrance of insects into greenhouses. However, the installation of these screens also has a negative effect on natural ventilation, which is reflected in the turbulence and velocity of the airflow inside the greenhouse. The turbulent characteristics of airflow through an insect-proof screen installed in the greenhouse windows have not been studied thoroughly in the literature. The present work focuses on the use of two simultaneous 3D sonic anemometers to study the impact of the use of a 13 × 30 threads·cm−2 insect-proof screen on the turbulence properties of the micro and microscale airflow turbulence. Four tests have been carried out in windward-oriented side windows of a Mediterranean greenhouse. Results demonstrate that the approach of using two simultaneous 3D sonic anemometers for the first time allows one to observe that the effect is different for the three components of the velocity vector field, and there is a strong connection between the simultaneous conditions inside and outside of the greenhouse. Useful information and data on the effect of using a 13 × 30 threads·cm−2 insect-proof screen are also provided. To give details on the impact of screens in the turbulent properties of ventilation is essential for any commercial distribution, as well as providing important data in the design and development of more efficient insect-proof screens.

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TinySegformer: A lightweight visual segmentation model for real-time agricultural pest detection

Zhang,

2024

Computers and Electronics in Agriculture

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On the estimation of three-dimensional porosity of insect-proof screens

Cited by 5 publications

References 46 publications

Improvements in the Characterisation of Permeability and Inertial Factor of Insect-Proof Screens through Pressure Drop Coefficients

Improvements in the Characterisation of Permeability and Inertial Factor of Insect-Proof Screens through Pressure Drop Coefficients

Analysis of Turbulent Air Flow Characteristics Due to the Presence of a 13 × 30 Threads·cm−2 Insect Proof Screen on the Side Windows of a Mediterranean Greenhouse

TinySegformer: A lightweight visual segmentation model for real-time agricultural pest detection

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