Pneumatic conveying experiments involving monodisperse and binary-size mixtures of glass beads with charges in the range of −10 to 10 $\text{n}\text{C}$ have been carried out. The mass loss method was adopted, with the minimum pickup velocity ($U_{pu}$) determined as the minimum velocity at which entrainment occurred. Similar to previous studies on minimum fluidization velocity, the U_pu increased with particle initial charge for the positively charged particles (0–10 nC). Surprisingly, however, negatively charged particles exhibited an opposite trend such that the U_pu decreased with charge magnitude. Therefore, for the particle initial charge range investigated (−10 to 10 nC), U_pu increased monotonically with particle initial charge, and the correlations available (Kalman et al., 2005; Tay et al., 2012) mis-predicted U_pu by up to 10 % for monodisperse systems and up to 40 % of binary-size systems. This underscores the necessity to account for particle initial charge in such correlations, particularly for polydisperse particle systems.

气动输送实验，涉及玻璃珠的单分散和二元尺寸混合物，电荷范围为-10至10 $\text{ñ}\text{C}$已经进行了。采用质量损失法，最小拾取速度（${ü}_{pü}$）确定为发生夹带的最小速度。与先前关于最小流化速度的研究相似，对于带正电的颗粒（0-10 nC），U _pu随着颗粒初始电荷的增加而增加。然而，令人惊讶的是，带负电的颗粒表现出相反的趋势，使得U _pu随着电荷量的增加而降低。因此，对于所研究的粒子初始电荷范围（-10至10 nC），U _pu随着粒子初始电荷单调增加，并且可用的相关性（Kalman等，2005； Tay等，2012）错误地预测了U _pu。对于单分散系统，最多可增加10％；对于二元系统，最多可减少40％。这强调了在这种相关性中考虑颗粒初始电荷的必要性，特别是对于多分散颗粒系统。