The vent hole size and the pressure drop are the important parameters which affect cooling rate and cooling uniformity in pressure pre-cooling of fruit and vegetable.
果蔬差压通风预冷包装箱的开孔大小及包装箱两侧的压差是影响预冷速度、冷却均匀性的重要参数。
Cooling rate and cooling uniformity are important indexex,which is used to evaluate pressure pre-cooling effects of fruit and vegetables.
预冷速度和冷却均匀性是评价果蔬冷却效果的重要指标。
The corner cracks of 150 mm by 150 mm continuous casting slabs were analyzed by way of examining the macro-structures, inclusions and metallographic structures of testing sample and it was found that the primary cause to the corner cracking is seriously inhomogeneous cooling conditions, which lead to stress concentration in the corner part of the slab, thus the corner cracking occurs in the slab.
针对 15 0mm× 15 0mm连铸坯的角部纵向开裂 ,从低倍、夹杂、金相组织方面进行分析 ,发现产生角部开裂的主要原因是严重冷却不均 ,从而造成角部应力集中 ,导致连铸坯角部纵向开裂 ,并提出改进措施。
