A Diffusion Model for a Drum Dryer Subjected to Conduction, Convection, and Radiant Heat Input
A Diffusion Model for a Drum Dryer Subjected to Conduction, Convection, and Radiant Heat Input
复制标题
承受传导、对流和辐射热输入的滚筒干燥机的扩散模型
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. S. Mujumdar
中科院分区：
文献类型：
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作者：
M. Islam;K. Thaker;A. S. Mujumdar
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.
