The error between S_k calculated using the viscous flow formula and S_v increased with the decrease of the particle size of powder and with the decrease of the bed porosity.

• 结果表明,粘滞流公式不适用于亚微米粉末,用粘滞流公式计算的 S_K 对于 S_V 的误差随粉末粒度和床层孔度的减小而增大。