| Autor: |
F. Mohaghegh, O. R. Roustapour, M. Hosseinalipour |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
The Proceedings of the 5th Asia-Pacific Drying Conference. |
| Popis: |
A pilot spray dryer with rotary atomizer is used to study the drying process of lime juice in experiment. A CFD simulation of drying is also presented. The thermophysical properties of lime juice are measured experimentally. The measurement includes assessment of heat conduction by Coaxial cylinder heat conductivity estimation device, specific heat by DSC calorimeter and density by volumetric pycnometer. In these measurements variation of properties with temperature and solid content was considered. These properties are needed to spray dryer modeling and define droplet properties. Spray drying analysis was done in axisymmetric conditions. The CFD simulation was done by commercial CFD software FLUENT 6.1 with discrete phase method in modeling two phase flow. By modeling droplets in spray dryer, the droplets distribution and their deposition on the chamber wall can be recognized. The most percent of evaporation occur at the constant rate period and there is not detectable change in diameter in falling rate period. Based on the results, increasing of the air inlet temperature causes an increase in drying rate therefore reducing of droplets diameter is occurred at lower time. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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