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    <title>UTas ePrints - Modelling and simulation of Paddy grain (Rice) drying in a simple pneumatic dryer</title>
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    <meta content="Bunyawanichakul, Pracha" name="eprints.creators_name" />
<meta content="Walker, Greg J." name="eprints.creators_name" />
<meta content="Sargison, Jane E." name="eprints.creators_name" />
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<meta content="The paper describes paddy grain (rice) drying in a pneumatic conveyor where gas–particle heat and mass
transfer occur simultaneously with transporting and drying operations. A one-dimensional macroscopic
drying model of the overall bed incorporating mass and energy balances and drying kinetics of moisture
diffusion inside the paddy grain is developed. The set of coupled non-linear ordinary differential equations is
solved numerically to illustrate the evolution of moisture and temperature of the paddy grain and air stream
throughout the dryer length. The effect of specific airflow rate, which depends on dryer diameter, paddy feed
rate and inlet-air velocity on the final moisture content, and temperature of paddy grain and air stream is
studied. The feasibility of paddy drying in a pneumatic conveyor is evaluated using the developed model. This
device is found impractical for drying of hygroscopic material such as paddy grain because of the low solid
residence time for dryers of reasonable size." name="eprints.abstract" />
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<meta content="Brooker D B; Bakker-Arkema F W; Hall C W (1992). Drying
and Storage of Grains and Oilseeds. AVI Book Publishing,
New York
Crowe C; Sommerfield M; Tsuji Y (1997). Multiphase Flows
with Droplets and Particles. CRC Press, London
Debrand S (1974). Heat transfer during a flash drying process.
I&amp;EC Process Design Development, 13, 396–404
De Padua D B (1985). Requirements for drying high moisture
content grain in Southeast Asia, preserving grain quality by
aeration and in-store drying. Proceedings of International
Seminar, pp 45–49, Kuala Lumpur, Malaysia.
Discroll R H; Adanezak T (1987). Drying Systems for The
Humid Tropics, bulk handling and storage of grain in
humid tropics. Proceedings of International Seminar,
pp 58–69, Kuala Lumpur, Malaysia
Inprasit C; Noomhorm A (2001). Effect of drying air
temperature and grain temperature of different types of
dryer operation on rice quality. Drying Technology, 19,
389–404
Jindal V K; Obaldo L G (1986). Rice husk-fired dryer for
disinfestation and rapid drying of paddy. Paper No. 86–202
presented at the Ninth Annual ASEAN Grains Post-harvest
Technology Seminar (Singapore). ASEAN Crops Postharvest
Programme, Manila, Philippines
Kunze O R; Calderwood D L (1980). Systems for Drying Rice,
Drying and Storage of Agricultural Crops. AVI Pub. Co.
Ltd., Connecticut, USA
Laithong C (1987). Study of thermo-physical properties of
rough rice. Master Thesis, Faculty of Energy and Materials,
King Mongkut’s Institute of Technology Thonburi, Bangkok,
Thailand
LevyA; Borde I (1999). Steady state one-dimensional flow for
a pneumatic dryer, Chemical Engineering and Process, 38,
121–130
Mujumdar A S (1995). Handbook of Industrial Drying, 2nd
edn. Marcel Dekker, Inc., New York
Pakowski Z; Bartczak Z; Strumillo C; Stenstrom S (1991).
Evaluation of Equations approximating thermodynamic
and transport properties of water, steam and air for use in
CAD of drying process. Drying Technology, 9, 753–773
Pelegrina A H; Crapiste G H (2001). Modelling the pneumatic
drying of food particles. Journal of Food Engineering, 48,
301–310
Poomsaad N; Soponronnarit S; Therdyotin A (2000). Diffusion
model of paddy drying by fluidization technique,
pp 777–782. Proceedings of the 14th Memorial CIGR
World Congress, Japan
Saastamoinen J (1992). Model of flash drying. In: Drying’92
(Mujumdar A S, ed), pp 434–443. Amsterdam, Netherlands
Sutherlland J W; GhalyT F (1990). Rapid fluidized bed drying
of paddy in the humid tropics, pp 1–12. Proceedings of the
13th ASEAN Seminar on Grain Post Harvest Technology,
Brunai
Soponronnarit S; Yapha M; Prachayawarakorn S (1995).
Cross-flow fulidized bed paddy drier: Prototype and
commercialization. Drying Technology, 13, 2207–2216
Steffe J F; Singh R P (1982). Diffusion coefficients for
predicting rice drying behaviour. Journal of Agricultural
Engineering Research, 27, 489–493
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and Design. Gordon &amp; Breach Science Publishers, New York
Thorpe G R; Wint A; Coggan G C (1973). The mathematical
modelling of industrial pneumatic dryer. Transactions of the
Instution of Chemical Engineering Research, 51, 339–349
Tumambing J A (1986). Current drying practices and need
in ASEAN, Bulk handling and storage of grain in the
humid tropics, pp 48–53. Proceedings of an International
Workshop, Kuala Lumpur, Malaysia
Wetchacama S; Soponronnarit S; Swasdisevi T; Prachayawarakorn
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properties in SI units. Transactions of ASAE, 19, 318–325
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<meta content="The paper describes paddy grain (rice) drying in a pneumatic conveyor where gas–particle heat and mass
transfer occur simultaneously with transporting and drying operations. A one-dimensional macroscopic
drying model of the overall bed incorporating mass and energy balances and drying kinetics of moisture
diffusion inside the paddy grain is developed. The set of coupled non-linear ordinary differential equations is
solved numerically to illustrate the evolution of moisture and temperature of the paddy grain and air stream
throughout the dryer length. The effect of specific airflow rate, which depends on dryer diameter, paddy feed
rate and inlet-air velocity on the final moisture content, and temperature of paddy grain and air stream is
studied. The feasibility of paddy drying in a pneumatic conveyor is evaluated using the developed model. This
device is found impractical for drying of hygroscopic material such as paddy grain because of the low solid
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    <h1 class="ep_tm_pagetitle">Modelling and simulation of Paddy grain (Rice) drying in a simple pneumatic dryer</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Bunyawanichakul, Pracha</span> and <span class="person_name">Walker, Greg J.</span> and <span class="person_name">Sargison, Jane E.</span> and <span class="person_name">Doe, Peter E.</span> (2007) <xhtml:em>Modelling and simulation of Paddy grain (Rice) drying in a simple pneumatic dryer.</xhtml:em> Biosystems Engineering, 96 (3). pp. 335-344. ISSN 1537-5110</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2241/1/BioSystem_Paper.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2241/1/BioSystem_Paper.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />252Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2825" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1016/j.biosystemseng.2006.11.004">http://dx.doi.org/10.1016/j.biosystemseng.2006.11.004</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The paper describes paddy grain (rice) drying in a pneumatic conveyor where gas–particle heat and mass&#13;
transfer occur simultaneously with transporting and drying operations. A one-dimensional macroscopic&#13;
drying model of the overall bed incorporating mass and energy balances and drying kinetics of moisture&#13;
diffusion inside the paddy grain is developed. The set of coupled non-linear ordinary differential equations is&#13;
solved numerically to illustrate the evolution of moisture and temperature of the paddy grain and air stream&#13;
throughout the dryer length. The effect of specific airflow rate, which depends on dryer diameter, paddy feed&#13;
rate and inlet-air velocity on the final moisture content, and temperature of paddy grain and air stream is&#13;
studied. The feasibility of paddy drying in a pneumatic conveyor is evaluated using the developed model. This&#13;
device is found impractical for drying of hygroscopic material such as paddy grain because of the low solid&#13;
residence time for dryers of reasonable size.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available online at http://www.sciencedirect.com/</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Grain drying, heat and mass transfer, paddy drying</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/290501.html">290000 Engineering and Technology &gt; 290500 Mechanical and Industrial Engineering &gt; 290501 Mechanical Engineering</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2241</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Jane Sargison</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">22 Oct 2007 23:28</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2241;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2241">item control page</a></p>
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