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|Title:||Design, construction and evaluation of a new laboratory convective dryer using CFD|
|Keywords:||Computational fluid dynamics (CFD)|
|Keywords (translated):||Υπολογιστική ρευστοδυναμική|
|Source:||International Journal of Mechanics|
|Abstract:||In order to overcome the lack of experimental data in the open literature and the necessity to validate numerical models, as well as increase the efficiency of the drying process, a new laboratory convective (LC) dryer has been designed, constructed and equipped with an integrated measurement and automated control instrumentation. The main sections of the LC dryer, which can be arranged for operation in a closed or open circuit mode through manually controlled dumpers, are the vertical flow drying chamber,the tube heat exchanger, the thermal boiler and finally the fan - motor with a smooth speed control unit. The experimental facility tested and monitored the moisture content removal of horticultural and agricultural products. The current paper outlines the methodology applied for the design and optimization of the LC dryer, which has been achieved through the analysis of the flow field by means of computational fluid dynamics (CFD). The prediction of the 3d flow problem was accomplished through the solution of the steady-state incompressible, Reynolds-Averaged Navier-Stokes (RANS) equations with the incorporation of the standard k-ε turbulence model. The measurement and control instrumentation with the inclusion of the innovative, pc-controlled, 3d traverse system that serves detailed surveys of the temperature and velocity inside the drying chamber, are also discussed. The performance test and evaluation of the LC dryer was conducted using quince slices as a test material at an average temperature of 60oC and air at 2 m/s into the drying chamber.|
|Appears in Collections:||Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε περιοδικά)|
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