Models for characterising the aerodynamics of insect-proof screens from their geometric parameters
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URI: http://hdl.handle.net/10835/14668
ISSN: 1537-5110
ISSN: 1537-5129
DOI: https://doi.org/10.1016/j.biosystemseng.2020.01.013
ISSN: 1537-5110
ISSN: 1537-5129
DOI: https://doi.org/10.1016/j.biosystemseng.2020.01.013
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López Martínez, Alejandro; Molina Aiz, Francisco Domingo; Valera Martínez, Diego Luis; Espinoza-Ramos, Karlos EmmanuelFecha
2020-02-07Resumen
This study characterised the geometric and aerodynamic parameters of 35 insect-proof screens with different weft and warp threads, with porosities ranging from 0.237 to 0.556 m2 m-2. The geometric parameters were assessed by analysing digital images,
and the aerodynamic parameters were determined using tests in a low-speed wind tunnel. Using the experimental measurements, four different models were developed and validated to estimate the aerodynamic parameters of an insect-proof screen from two or more of their geometric parameters: (i) to estimate the pressure drop coefficient Fφ based on the thread diameter Reynolds number (Red) and screen porosity φ [m2 m-2] Fφ=(0.4810002+11.5331/Red)×((1–φ2)/φ2) (R2 = 93.9% with a p-value = 0.000); (ii) estimating Fφ based on the screen thickness Reynolds number (Ret) and screen porosity φ [m2 m-2] Fφ = (0.475502+26.2114/Ret)×((1–φ2)/φ2) (R2 = 92.1% with a pvalue = 0.000); (iii) estimating screen permeability Kp=Dh2φ3/(2.0679 (1–φ)2)+3.8362×10–10 ...