目的 探究热风干燥烘箱结构对干燥性能的影响。方法 采用SolidWorks对4种不同结构的烘箱进行三维建模并利用Ansys Fluent对烘箱内部热风流动与换热过程进行数值仿真,分析喷嘴出口导流件和贯穿风室的排风管对速度分布、流动阻力及基材表面换热量的影响规律。结果 喷嘴出口导流件阻碍射流两侧补气和压力平衡,导致射流偏斜,从而降低热风与基材表面的冲击换热强度;排风管对换热量影响较小,但会增大喷嘴出口速度偏差和流动阻力,降低换热均匀性。取消导流件和排风管后,热风流动阻力虽增大19.27 Pa,但基材表面换热量提高33.7%,热流密度变异系数由2.31%降至1.35%。结论 导流件是影响烘箱换热性能的重要因素,排风管主要影响流动阻力和换热均匀性。取消导流件和排风管可提高基材表面的换热强度及均匀性,有利于改善烘箱干燥性能。
Abstract
The work aims to investigate the effect of the hot-air drying oven structure on drying performance. Three-dimensional models of four ovens with different structures were established with SolidWorks. Numerical simulations of the hot-air flow and heat transfer processes inside the ovens were conducted via Ansys Fluent, and the effects of the nozzle-outlet flow guide and the exhaust pipe penetrating the air plenum on velocity distribution, flow resistance, and heat transfer rate on the substrate surface were analyzed. The flow-guiding components at the nozzle outlets obstructed the air supply on both sides of the jet and the pressure balance, causing jet deflection and thereby reducing the impinging heat transfer intensity between the hot air and the substrate surface. The exhaust pipes had little effect on the heat transfer rate, but increased the velocity deviation at the nozzle outlets and the flow resistance, thereby reducing heat transfer uniformity. After removal of the flow-guiding components and the exhaust pipes, the flow resistance of the hot air increased by 19.27 Pa, while the heat transfer rate on the substrate surface increased by 33.7%, and the coefficient of variation of the heat flux decreased from 2.31% to 1.35%. The flow-guiding components are the main structural factor affecting the heat transfer performance of the oven, while the exhaust pipes mainly affect the flow resistance and heat transfer uniformity. Removing the flow-guiding components and the exhaust pipes can improve the heat transfer intensity and uniformity on the substrate surface, which is beneficial to improving the drying performance of the oven.
关键词
热风干燥烘箱 /
数值仿真 /
导流件 /
排风管 /
干燥性能
Key words
hot-air drying oven /
numerical simulation /
flow-guiding component /
exhaust pipe /
drying performance
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