这是由于开口尺寸或速度变化使颗粒间相互作用及颗粒流状态变化造成的。
The interaction between the granular wafers is changed when altering the speed or the opening size at the choke point, and affects the motion of granular flow.
本发明具有多项独特检测功能，能快速的确认 危险品的种类，开口尺寸适中，占地面积小的特点。
The invention has multiple unique detection functions, and can confirm the types of dangerous goods quickly. The invention has the characteristics of proper size of the openings and small floor space.
给出电冰箱排水管设计应遵循的准则，同时从热力学和流体力学的角度推导出风冷冰箱排水管开口尺寸的计算公式。
Discusses the principle of drainpipe design for refrigerator, and also gives the formula of opening size of drainpipe of air-cooled refrigerator based on thermodynamics and hydrodynamics.
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