Effects of temperature distribution on portable rotary dryer using finite thermal resistance analysis and CFD method in no loads conditions
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Abstract
This research studied the fluid dynamics and thermal boundary distribution on portable rotary dryers using finite thermal resistance analysis with no external conditions involved. A small squared-edged rotary dryer was used to generate a swirling of hot air. The study was conducted with a mathematical model of finite thermal resistance (FTR) and the computational fluid dynamics (CFD) model for calculating drying temperature and heat transfer rate. Afterward, the experimental results were examined in real conditions using the testing equipment. The test results revealed that at the actual experimental temperature of 85 °C, hot air velocity of 1.5 m/s, the FTR method, the drying temperature was lower than the average experimental result at 11.3 °C, with the maximum drying temperature of 69.6 °C and an average deviation of 9.2%. The CFD method resulted in the highest drying temperature of 83.0 °C, with an average deviation of 4.0%. Both methods showed the same direction as the experimental results with the average heat transfer rate of 49.28 watts. In the analysis of the uncertainty of drying temperature, the FTR and CFD methods resulted in ±2.171 °C and ±2.252 °C, respectively. The Coefficient of Determination: R2 of the FTR and the CFD method provided the values of 0.9679 and 0.9989, respectively. The results can be applied in the analysis of the drying temperature of rotary dryers for other products.
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