Minimum pickup velocity: The transition between nano-scale and micro-scale
| Autor: | Jia Wei Chew, Aditya Anantharaman, J. Ruud van Ommen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Materials science Scale (ratio) General Chemical Engineering 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Classical mechanics 020401 chemical engineering Flow velocity Nano Particle Pickup 0204 chemical engineering 0210 nano-technology Nanoscopic scale Biotechnology |
| Zdroj: | AIChE Journal. 63:1512-1519 |
| ISSN: | 0001-1541 |
| DOI: | 10.1002/aic.15527 |
| Popis: | 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 (Upu), which is the minimum fluid velocity required to initiate motion in a particle originally at rest. The Upu values of nine alumina particles with particle diameters (dp) ranging from 5 nm 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: (i) Upu varied non-monotonically with increasing dp, thus revealing the missing link between the nano- and micro-scales; (ii) the intermediate particle diameters surprisingly did not agree with any pickup Zone; (iii) Zone III (analogous to Geldart Group C) is inadequate for all the nano-scale particles, so new boundaries and a new Zone are proposed. This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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