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https://ptsldigital.ukm.my/jspui/handle/123456789/486925Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Meor Zainal Meor Talib, Assoc. Prof. Dr. | - |
| dc.contributor.author | Ifa Puspasari (P42044) | - |
| dc.date.accessioned | 2023-10-11T02:26:37Z | - |
| dc.date.available | 2023-10-11T02:26:37Z | - |
| dc.date.issued | 2012-07-24 | - |
| dc.identifier.other | ukmvital:114496 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/486925 | - |
| dc.description | Fluidized bed dryers are widely used to dry various materials due to its high heat and mass transfer rates, good mixing of solids, ease of operation and maintenance and also lower capital cost. However, some materials are difficult to process in a conventional fluidized bed and require specific modifications. Oil palm fibre is one of the materials that are difficult to fluidize due to the high moisture content and the fibrous nature of the material. Aeration of the bed of wet fibre in a conventional fluidized bed caused the bed to be partially lifted. This research aimed to investigate the fluidization ability of oil palm frond particles in a fluidized bed assisted with mechanical agitation. After the fluidization characteristics of the material were established, the drying characteristics in the assisted fluidized bed dryer were studied. Experiments were carried out in a column with height of 72 cm and ID of 14.4 cm. The superficial air velocity used for fluidization experiments ranged from 0.1 - 1.1 m/s, bed height ranged from 4 - 8.5 cm, stirrer speed ranged from 300 - 700 rpm and particle initial moisture content from 0.5 - 2.4 g water/g dry solid. The results showed that it was possible to fluidize the fibres in a fluidized bed by assisting with mechanical agitation. Agitation helped to loosen the entanglement of the fibres that prevents the air to pass through the bed of particles, as a result, fluidization state could be attained. Analysis of the fluidization characteristics showed that minimum fluidization velocity is independent with bed height and agitation speed. Investigation on the effect of particle initial moisture content showed that the minimum fluidization velocity increases with particle moisture content and lies in the range of 0.68 - 0.96 m/s. A new correlation to predict the minimum fluidization velocity has been derived which gave good agreement with the experimental data in this work and the experimental data from other works found in the literature as well. Drying kinetics of oil palm frond particles was investigated in a batch laboratory agitated fluidized bed dryer with an initial moisture content of about 2.50.3 g water/g dry solid. The drying parameters investigated were inlet air temperature (50, 60 and 80 °C), inlet superficial air velocity (0.6, 0.8 and 1.0 m/s), bed height (5.5, 7 and 8.5 cm) and agitation speed (300, 400 and 500 rpm). The results indicated that the drying rate increases with air temperature, superficial air velocity, and a decrease in bed height. The drying rate slightly increases with agitation speed but only during the initial drying period, after that, the drying rate is independent of agitation speed. The minimal effect of agitation speed was quantitatively shown with the analysis using Taguchi method which showed a percent influence of only 0.8% to the drying kinetics. The most significant parameter was the inlet air temperature with 52.9% influence followed with inlet superficial air velocity (28.9%) and bed height (17.4%). A new composite drying rate model based on exponential and power law predicted well the drying kinetics, both for the increasing and falling rate periods.,"Certification of Master's/Doctoral Thesis" is not available,Ph.D. | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | - |
| dc.rights | UKM | - |
| dc.subject | Fluid dynamics | - |
| dc.subject | Fluidization | - |
| dc.subject | Fluidized-bed furnaces | - |
| dc.subject | Frictional resistance (Hydrodynamics) | - |
| dc.subject | Hydrodynamics | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.title | Hydrodynamic and drying characteristics of oil palm frond particles in an agitated fluidized bed dryer | - |
| dc.type | Theses | - |
| dc.format.pages | 183 | - |
| dc.identifier.callno | TP156.F65I354 2012 3 tesis | - |
| dc.identifier.barcode | 002309(2012); 004054(2019)(PL2) | - |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_114496+SOURCE1+SOURCE1.0.PDF Restricted Access | 14.46 MB | Adobe PDF |  View/Open |
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