Minimum pickup velocity

The transition between nano-scale and micro-scale

Journal article (2017)

Authors

Aditya Anantharaman Nanyang Technological University
J.R. van Ommen ChemE/Product and Process Engineering - AS
Jia Wei Chew Nanyang Technological University
Research Group
ChemE/Product and Process Engineering (AS) (TU Delft)
Nano-scale Nanoparticle agglomerate Micro-scale Gas-solid pneumatic conveying Minimum pickup velocity
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Published Date

2017-5

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Product and Process Engineering

Abstract

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 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) Upu varied non-monotonically with increasing dp, 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.

Files

Aic.15527.pdf
(.pdf | 0.401 Mb)