Effect of colloidal particles associated with the liquid bridge in sticking during drying in superheated steam

Hamawand, I. (2011) Effect of colloidal particles associated with the liquid bridge in sticking during drying in superheated steam. International Journal of Engineering, Transactions B: Applications, 24 (2). pp. 119-126. ISSN 1025-2495

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Abstract

It is important in the design of a drying system to evaluate the sticking behaviour of the materials being dried. A new approach to the sticking issue is applied in this study by carrying out a sticking test for the liquid associated with the materials under study. It was found that the liquid bridge is responsible for the initial sticking of the materials to the contact surfaces. The colloidal material in this liquid is eventually responsible of building a sticky solid bridge during drying. The glass transition temperature for the Brewers Spent Grain (BSG) particles and the colloidal solution expelled from these particles were tested using Differential Scanning Calorimetric (DSC). However, the chopped BSG particles showed no glass transition temperature; there were an appreciable number of particles stuck to the rotary drum dryer and the sample holders during drying. The colloidal
particles in the liquid bridge were filtered and concentrated through evaporation and then analysed by DSC where they showed a glass transition temperature at (-23) and (-33) oC. In addition, the associated liquid thus prepared showed a honey consistency and a sticky touch when concentrated.
These two properties are indications that this colloidal material may be responsible for sticking the BSG to the steel surfaces during drying.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Additional Information: This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 30 Jul 2014 06:20
Last Modified: 01 Jun 2017 04:15
Uncontrolled Keywords: colloidal particles; sticking; liquid bridge; rotary drum; superheated steam drying
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090403 Chemical Engineering Design
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030603 Colloid and Surface Chemistry
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/25571

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