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Mathematical Problems in Engineering
Volume 2016, Article ID 9071531, 7 pages
http://dx.doi.org/10.1155/2016/9071531
Research Article

Heat Transfer Analysis and Modification of Thermal Probe for Gas-Solid Measurement

National Key Laboratory of Science and Technology on Multispectral Information Processing, School of Automation, Huazhong University of Science and Technology, Wuhan 43004, China

Received 22 November 2015; Accepted 5 January 2016

Academic Editor: Yuan Fan

Copyright © 2016 Hong Zhang and Xiangying Qi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The presented work aims to measure the gas-solid two-phase mass flow-rate in pneumatic conveyor, and a novel modified thermal probe is applied. A new analysis of the local heat transfer coefficients of thermal probe is presented, while traditional investigations focus on global coefficients. Thermal simulations are performed in Fluent 6.2 and temperature distributions of the probe are presented. The results indicate that the probe has obviously stable and unstable heat transfer areas. Based on understanding of probe characteristics, a modified probe structure is designed, which makes the probe output signal more stable and widens the measuring range. The experiments are carried out in a special designed laboratory scale pneumatic conveyor, and the modified probe shows an unambiguous improvement of the performance compared with the traditional one.