Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/28211
Title: Study a new atmospheric freeze drying system incorporating a vortex tube and multi-mode heat input
Authors: SHEK MOHAMMOD ATIQURE RAHMAN
Keywords: Atmospheric freeze drying, Vortex tube, Vibrating bed dryer, Multimode heat input, Adsorbent, Simulation
Issue Date: 26-May-2009
Source: SHEK MOHAMMOD ATIQURE RAHMAN (2009-05-26). Study a new atmospheric freeze drying system incorporating a vortex tube and multi-mode heat input. ScholarBank@NUS Repository.
Abstract: Atmospheric freeze drying (AFD) in a vibro-fluidized bed dryer coupled with an adsorbent and multimode heat input is proposed for dehydration of food products. An experimental setup was designed and built to permit simultaneous application of convection, conduction and radiation heat input to the drying material above its freezing point to ensure sublimation using a vortex tube. A parametric evaluation over a range of possible parameter values as well as quality and functional properties of the dried products was carried out using heat sensitive products. Comparisons with different drying method were carried out to investigate the viability of this new system. A two-layer moving boundary model was developed to simulate the drying kinetics and temperature scenario of thin slab product. Finally a three-dimensional (3D) CFD simulation for a vortex tube is carried out to capture the highly swirling compressible flow behavior and to gain basic understanding of temperature separation process.
URI: http://scholarbank.nus.edu.sg/handle/10635/28211
Appears in Collections:Ph.D Theses (Open)

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0 Chp.pdf556.84 kBAdobe PDF

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Introduction ( Ch-1).pdf57.9 kBAdobe PDF

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Review of literature (Ch-2).pdf186.81 kBAdobe PDF

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Experiment (Ch-3).pdf273.82 kBAdobe PDF

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Modelling and Simualtion (Chp-4).pdf78.42 kBAdobe PDF

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Experimental Results (Chp-5).pdf2.41 MBAdobe PDF

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Simualtion Results(Chp-6).pdf130.39 kBAdobe PDF

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CFD simulation (Chp-7).pdf1.11 MBAdobe PDF

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Conclusion (Chp-8).pdf42.16 kBAdobe PDF

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Bibliography and Appendix.pdf1.49 MBAdobe PDF

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