Characterisation of airflow resistance of different moisture content wheat bulks mixed with different percentages and sizes of dockage

IF 5.3 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Biosystems Engineering Pub Date : 2025-08-15 DOI:10.1016/j.biosystemseng.2025.104261

Amin Sadeghizadeh , Fuji Jian , Digvir S. Jayas

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引用次数: 0

Abstract

Airflow resistance is a key factor related to physical properties of grain bulks and is influenced by dockage size and its percentage. A cubic chamber with inner dimensions of 500 × 500 × 500 mm was employed to investigate the airflow resistance of wheat bulks mixed with varying sizes (≤1.1 mm, 1.1–2.0 mm, and ≥3.3 mm) and percentages of dockage (0, 1.0, 2.5, and 5.0 %), along with different moisture contents (14.5, 16.5, and 18.5 %), airflow velocities (1.1–6.6 m s⁻¹), and in both vertical and horizontal directions. The airflow resistance decreased with the reduced airflow velocity supplied by the fan, and the supplied airflow rate decreased with the increased airflow resistance. Fine materials (≤1.1 mm) mixed with the clean wheat led to 30–50 % increase of airflow resistance in both directions. Adding 1 % of dockage >3.3 mm (chaff) decreased the airflow resistance by ∼10 %, while adding dockage of 1.1–2 mm size (slightly smaller than wheat) did not result in airflow resistance change. Adding dockage with mixed size had an average 45.6 and 41.2 % increase of airflow resistance in horizontal and vertical directions, respectively. Airflow resistance in both clean and wheat mixture in the vertical direction was ∼50 % higher than that in the horizontal direction in any moisture content of wheat mixtures. This increased airflow resistance in the vertical direction was in the range of 10–117 %. The best regression equation was the Modified Haque model for predicting airflow resistances tested in this study.

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不同含水率、不同填料比例和尺寸的小麦散装料的气流阻力特性

气流阻力是影响颗粒物性的关键因素，受堆积尺寸和堆积比例的影响。采用内部尺寸为500 × 500 × 500 mm的立方室，研究了不同粒径（≤1.1 mm、1.1 ~ 2.0 mm和≥3.3 mm）、不同含水量（14.5、16.5和18.5%）、不同气流速度（1.1 ~ 6.6 m s−1）、不同垂直和水平方向混合的小麦块体的气流阻力。气流阻力随风机供给气流速度的减小而减小，供给气流速率随气流阻力的增大而减小。细料（≤1.1 mm）与清洁小麦混合，导致气流阻力在两个方向上都增加30 - 50%。添加1%的3.3 mm（箔条）填料可使气流阻力降低~ 10%，而添加1.1-2 mm（略小于小麦）的填料则不会导致气流阻力变化。添加混合尺寸船坞在水平和垂直方向上的气流阻力分别平均增加45.6%和41.2%。在任何含水量的小麦混合料中，清洁和小麦混合料在垂直方向上的气流阻力都比在水平方向上的气流阻力高约50%。在垂直方向上增加的气流阻力在10 - 117%之间。本研究中预测气流阻力的最佳回归方程为修正Haque模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biosystems Engineering 农林科学-农业工程

CiteScore

10.60

自引率

7.80%

发文量

239

审稿时长

53 days

期刊介绍： Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.