Minimum Pickup Velocity: The Transition Between Nano-Scale and Micro-Scale

作者：Anantharaman Aditya; van Ommen J Ruud; Chew Jia Wei^*

来源：AIChE Journal, 2017, 63(5): 1512-1519.

DOI：10.1002/aic.15527

• minimum pickup velocity
• gas-solid pneumatic conveying
• nanoparticle agglomerate
• nano-scale
• micro-scale

The transport of nano-scale particles has become increasingly important, but the knowledge base available is limited. This study aims to bridge the knowledge gap between the nano-and micro-scales for pneumatic conveying. A key parameter is the minimum pickup velocity (U-pu), which is the minimum fluid velocity required to initiate motion in a particle originally at rest. The U-pu values of nine alumina particles with particle diameters (d(p)) ranging from 5 to 110,000 nm were determined using the weight loss method, then compared against the established pickup Zones (analogous to the Geldart Groups). Results indicated that: (1) U-pu varied non-monotonically with increasing d(p), thus revealing the missing link between the nano- and micro-scales; (2) the intermediate particle diameters surprisingly did not agree with any pickup Zone; (3) Zone III (analogous to Geldart Group C) is inadequate for all the nano-scale particles, so new boundaries and a new Zone are proposed.

• 出版日期2017-5
• 单位南阳理工学院