Please use this identifier to cite or link to this item: https://doi.org/10.1080/07373930701397467
Title: A diffusion model for a drum dryer subjected to conduction, convection, and radiant heat input
Authors: Islam, Md.R.
Thaker, K.S.
Mujumdar, A.S. 
Keywords: Biological sludge
Convection
Diffusivity
Mass flux
Moisture content
Pilot scale
Radiation
Thermal conductivity
Issue Date: Jun-2007
Source: Islam, Md.R., Thaker, K.S., Mujumdar, A.S. (2007-06). A diffusion model for a drum dryer subjected to conduction, convection, and radiant heat input. Drying Technology 25 (6) : 1033-1043. ScholarBank@NUS Repository. https://doi.org/10.1080/07373930701397467
Abstract: Drum dryers are commonly used for production of a flaky dry powder from thick suspensions. This article presents results of a simple diffusion-based model to predict the drying performance of a pilot-scale twin-drum dryer. Numerical results are compared with experimental data obtained for a biological sludge whose initial moisture content varied from 1.0 to 2.3 kg/kg db. The agreement of model predictions with the pilot-scale experimental data is favorable. Effects of film thickness, drum rotational speed, external air flow velocity, and its humidity are examined parametrically. Sludge film thickness is identified as the most critical operating parameter to control the final moisture content and productivity of the dryer. The validated model is used to predict performance of a drum dryer subjected to heat input by convection and radiation along with conduction through the drum wall. It is shown that dryer output can be enhanced significantly by increasing the film thickness and applying radiant heating in the initial period of drying. A simple mathematical model of this type can be used for the purpose of design and analysis as well as scale-up of industrial drum dryers based on simple laboratory-scale experiments.
Source Title: Drying Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/54066
ISSN: 07373937
DOI: 10.1080/07373930701397467
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

12
checked on Dec 5, 2017

WEB OF SCIENCETM
Citations

10
checked on Nov 16, 2017

Page view(s)

58
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.