摘要
为研究小麦粉摩擦特性的测定方法及不同湿基含水率、粒度下的相关规律，以5种湿基含水率（分别为8．76％、11．4l％、13．87％、16．43％、18．28％）、3种粒度（几何平均粒径分别为187、328、412μm）的小麦粉为试验材料，利用直剪仪、自主研发的斜面仪、休止角测定装置，对不同湿基含水率、不同粒度的小麦粉的内摩擦角、滑动摩擦角、休止角等摩擦特性进行了测定。结果表明：小麦粉的休止角在40．3°～47．6°之间，小麦粉与塑料板、玻璃板、镀锌板、不锈钢板之间的滑动摩擦角分别在39．6°～56．5°，37．7°～48．5°，35．3°～47．5°和33．2°～44．O°之间，其内摩擦角在20．4°～32．2°之间。小麦粉含水率越高、粒度越小，则小麦粉粒之间的摩擦力越大，流动性就越差，其内摩擦角、滑动摩擦角、休止角也就越大。
In order to optimize the determination method and the relevant law of wheat meal＇s friction character- istics, , five kinds of wheat meals with different wet basis moisture content （respectively 8. 76%, 11.41%, 13.87% , 16.43% , 18.28% ） and three kinds of particle sizes （geometric mean particle diameters are respectively 187, 328, 412 μm） have been researched. Parameters as the internal friction, sliding friction angle, repose angle of different wet basis moisture contents and different particle sizes of wheat meal have been measured by means of direct shear apparatus, self- made bevel instrument and the angle of repose measuring device, respectively. The results showed that on condition that the wheat meal° angle repose was 40.3°～47.6° ; the sliding friction angle on the plastic board, the glass plate, the galvanized plate and the stainless steel plate were 39.6°～ 56.5°, 37.7°～48.5°, 35.3°～ 47.5° and 33.2°～ 44.0° respectively; the internal friction angle was 20.4°～ 32.2°. The moisture content has a op- posite relationship with the particle size; the bigger the friction force among particles were, the poorer the liquidity would be; while the bigger the angle of repose, the sliding friction angle, the internal friction angle would be.
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2015年第8期7-12,共6页
Journal of the Chinese Cereals and Oils Association
基金
公益性行业(农业)科研专项(201203015)
"十二五"国家科技计划(2011BAD26B0401)
关键词
小麦粉
含水率
粒度
摩擦特性
wheat meal, moisture content, particle size, friction characteristics
