열풍건조기의 내부 공기유로 개선을 위한 연구

Hot air drying, which circulates hot air in a dryer, removes water contents inside a substance by causing evaporation on the surface. For dryers, reducing power consumption, drying time and the amount of water contents between distributed drying materials are the most significant aspects for better performance. To achieve this goal, the time for the air to reach the drying material and dryness of the air become important factors when designing air flow path inside a dryer. In this study, 3 cases of air flow path were proposed and water evaporation quantity and evaporation differences of 15 locations in a dryer were compared by computational fluid dynamic simulation. Simulation results were first verified by experiments which were carried out with 15 glass dishes filled with 30 g of water, in the same locations as the simulation. Computational results indicated that Case 2 which supplied hot air from the left side and generates uniform horizontal flow from left to right, and finally exiting to the right side showed the best performance among 3 cases in terms of evaporation quantity and evaporation uniformity.