Drying comparison of nonhygroscopic and hygroscopic materials
This paper investigates and presents the simulation of drying for hygroscopic and nonhygroscopic materials. This present work used a coupled mathematical model of mass, heat and gas transfer that implemented to finite element method in two dimensional and numerically compute using Skyline solver to...
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| Main Authors: | , , |
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| Format: | Article |
| Published: |
Trans Tech Publications Inc
2014
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| Subjects: | |
| Online Access: | http://www.scientific.net/AMM.465-466.637 http://www.scientific.net/AMM.465-466.637 http://eprints.uthm.edu.my/8289/1/28_Drying_comparison_(cant_upload).pdf |
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| Summary: | This paper investigates and presents the simulation of drying for hygroscopic and
nonhygroscopic materials. This present work used a coupled mathematical model of mass, heat and
gas transfer that implemented to finite element method in two dimensional and numerically
compute using Skyline solver to capture highly nonlinear transient process. Bound water
contribution was taken into account in the drying of hygroscopic materials by incorporating
constitutive equation of bound water. The results showed drying process can be divided into three
periods named constant rate period (CRP), first falling rate period (FRP1) and second falling rate
period (FRP2). Capillary action is dominated during CRP before vapour diffusion takes place in
FRP1. Bound water movement is generated by vapour pressure gradient exists that represent
hygroscopic material. |
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