Evaluation of wood chips terminal velocity and some morphological properties in a wind tunnel experiment

IF 2.4 3区 农林科学 Q1 FORESTRY European Journal of Wood and Wood Products Pub Date : 2024-08-05 DOI:10.1007/s00107-024-02123-w
Gábor Németh, Zoltán Kocsis, Endre Magoss
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Abstract

The removal of wood dust and chips from the work area is also important for occupational health safety regulation and to avoid the risk of fire and dust explosion. Knowledge of the terminal velocity is an important condition for the effective and economical operation of commonly used wood dust-chip extraction systems. While the largest particles are important from the point of view of the operation of the extraction system, knowledge of the terminal velocity of small particles (under 1 mm) is desirable from the point of view of separation and occupational health safety. New measuring and calculation method is developed in order to determine the terminal velocity of wood particles. We built an experimental device to measure the terminal velocity of wood dust-chip particles, and using the experimental results, we modified the calculated terminal velocity based on the modified equivalent particle density (100–130 kg/m3) in the 1–150 μm size range. The terminal velocity of wood particles under 150 μm more and more deviates from the theoretical values. As a result of mechanical processing, the resulting wood particles’ shape is in most cases flat. The average thickness of the wood particles is mainly determined by the sawing parameters. The flat shape of particles increases the specific surface area in a certain extent depending on the distribution parameters.

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风洞试验中木屑末端速度和一些形态特性的评估
从工作区清除木屑和粉尘对于职业健康安全法规以及避免火灾和粉尘爆炸的风险也很重要。了解末端速度是有效和经济地运行常用木屑和粉尘抽排系统的重要条件。从抽吸系统运行的角度来看,最大颗粒固然重要,但从分离和职业健康安全的角度来看,了解小颗粒(1 毫米以下)的末端速度也是可取的。为了确定木质颗粒的末端速度,我们开发了新的测量和计算方法。我们建立了一个测量木屑尘粒末端速度的实验装置,并利用实验结果,根据修正后的等效颗粒密度(100-130 kg/m3)修正了 1-150 μm 粒径范围内的末端速度计算值。150 μm 以下木质颗粒的末端速度与理论值的偏差越来越大。经过机械加工后,木质颗粒的形状在大多数情况下是扁平的。木材颗粒的平均厚度主要由锯切参数决定。颗粒的扁平形状在一定程度上增加了比表面积,这取决于分布参数。
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来源期刊
European Journal of Wood and Wood Products
European Journal of Wood and Wood Products 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
3.80%
发文量
124
审稿时长
6.0 months
期刊介绍: European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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