The results obtained from a drying experiment using infrared heating are compared to those obtained from an analytical model based on correlations for the mass transfer coefficients, which are commonly used to obtain evaporation rates for drying applications. It was shown that the mass transfer coefficients calculated by natural convection correlations are approximately ten times lower than those measured under infrared (IR) exposure. In an attempt to explain this discrepancy, which has been also observed in other studies and explained on the basis of thermal radiation effects, optical properties of the solvent are presented and the implications of the IR and near infrared (NIR) spectrum on the thermal radiation effects and ensuing evaporation rates are discussed. The results show that the correlation for mass transfer coefficient has to take into account the IR radiation temperature and the surface emissivity. This study provides important evaporation data on mass flux and mass transfer coefficients, which cannot be predicted using traditional correlations, for the design of IR assisted drying systems.

基于传质系数之间的相关性，将使用红外加热的干燥实验获得的结果与分析模型获得的结果进行比较，该关系式通常用于获得干燥应用的蒸发速率。结果表明，通过自然对流相关性计算出的传质系数比在红外（IR）照射下测得的传质系数低约十倍。为了解释这种差异，在其他研究中也观察到这种差异，并根据热辐射效应进行了解释，提出了溶剂的光学性质，以及红外和近红外（NIR）光谱对热辐射的影响讨论了影响和随后的蒸发速率。结果表明，传质系数的相关性必须考虑红外辐射温度和表面发射率。这项研究为红外辅助干燥系统的设计提供了重要的关于质量通量和传质系数的蒸发数据，而使用传统的相关性无法预测这些数据。