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Title: A Numerical Study on the Convective Heat Transfer Characteristics of Pulsed Impingement Drying
Authors: Jiang, Y.
Xu, P.
Mujumdar, A.S. 
Qiu, S.
Jiang, Z.
Keywords: CFD
Impingement drying
Nusselt number
Pulsed flow
Issue Date: Aug-2012
Citation: Jiang, Y., Xu, P., Mujumdar, A.S., Qiu, S., Jiang, Z. (2012-08). A Numerical Study on the Convective Heat Transfer Characteristics of Pulsed Impingement Drying. Drying Technology 30 (10) : 1056-1061. ScholarBank@NUS Repository.
Abstract: Impinging jets issuing from the tailpipe of pulse combustors have been evaluated in recent studies for possible applications in rapid drying of continuous sheets such as grades of paper, textiles, etc. In order to further understand the effect of pulsed flows on the heat and mass transfer rates of impinging jets, a numerical study was performed on a two-dimensional pulsating impinging jet array. A computational fluid dynamics approach was used to examine the effect of periodic sinusoidal pulsation on the local Nusselt number distribution of the wet target surface being dried. Because a high temperature and large temperature difference between the jet flow and impingement surface are used to obtain high heat transfer rates in impingement drying, the thermophysical properties of jet flows were taken into account in the present mathematical model. A parametric study including phase angle and frequency as well as amplitude of pulsating flows was conducted for optimization and design of pulsating jet arrays. Examination of the velocity and thermal fields showed that the instantaneous heat transfer rate on the target surface was highly dependent on the mass transfer characteristic and development of the hydrodynamic boundary layer with time. © 2012 Copyright Taylor and Francis Group, LLC.
Source Title: Drying Technology
ISSN: 07373937
DOI: 10.1080/07373937.2012.683121
Appears in Collections:Staff Publications

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