微弱压差下经细微孔隙的换质过程的主要特徵

• 作 者: 李培清 张锡宁
• 机 构: 长沙铁道学院机车车辆系,长沙铁道学院机车车辆系,
• 出 处: 长沙铁道学院学报
• 发表日期: 1986年01期
• 关键词: 微孔隙 传质 压差 传热系数 下经 细微孔隙 车体的漏泄 车体的传热系数 车体 渐近值

1984年9月对车厢模型进行了试验研究。试验表明,在以“热”法试验测定车体传热系数的稳态传热过程中所伴生的换质过程,系在微弱压差下经细微孔隙的换质过程。测定结果证明,上述换质过程中的换质量和因而引起的能量耗散将随模型壁上细微孔穿孔数的增多而趋于定值,因而车体传热系数的增大倍数也将随细微孔数增加而趋于定值。经模型试验测定,此增大倍数的渐近值约为1.12。

In 1984 September on the car model was studied. The experiment shows that the “metamorphic” process during the steady-state heat transfer of the car body’s heat transfer coefficient measured by the “hot” method is the process of fine pore’s metamorphism under a slight pressure difference. The measurement results show that the exchange rate and the energy dissipation caused by the above-mentioned reforming process tend to be fixed with the increase of the number of micropore perforations in the wall of the model, and thus the multiplication factor of the heat transfer coefficient of the vehicle body will also vary with the fineness The number of holes tends to be fixed. As determined by the model test, the asymptotic value of this increase is about 1.12.