Foam-mat drying (FD) was applied to encapsulate red sorghum extract (RSE) rich in proanthocyanidins. A sufficient amount of whey protein isolate (WPI) to build the foam that supported the drying acceleration and a mechanistic model for process quantification were required to design FD precisely. This research investigated the WPI percentage necessary for creating the best foam-microstructure to accelerate the drying considering the foam properties profiles during whipping and built a mechanistic model to quantitatively describe the drying phenomena illustrating the moisture distribution in foam. The foam obtained by the best formula (10% of WPI, 15 min of whipping) was then dried at 40, 50, and 60 ℃ of temperature. A mechanistic model was developed considering intraparticle diffusion, liquid-gas mass transfer, and liquid-gas equilibrium, involving effective-diffusivities ($D_{eff}$) and gas-liquid mass transfer coefficient (K) as parameters. The parameters were solved numerically, illustrating drying phenomena at several temperatures. It was observed that the model proposed works well, and the value of $D_{eff}$ and K was temperature-dependent, with the activation energy of 5.904 kJ/mol and 13.857 kJ/mol, respectively. The encapsulation reached the yield (wb) of 16.24 - 18.29%, the encapsulation productivity of 84.17 - 96.01%, and proanthocyanidin content in the product of 9.113–9.227 mg/g.

应用泡沫垫干燥（FD）封装富含原花青素的红色高粱提取物（RSE）。为了精确设计FD，需要足够数量的乳清蛋白分离物（WPI）来构建支持干燥加速的泡沫，并需要一个用于过程量化的机械模型。这项研究考虑了搅打过程中的泡沫特性，调查了创建最佳泡沫微结构以加快干燥速度所必需的WPI百分比，并建立了一个机械模型来定量描述干燥现象，该现象说明了泡沫中的水分分布。然后将最佳配方的泡沫（WPI的10％，搅打15分钟）在40、50和60℃的温度下干燥。建立了考虑颗粒内扩散，液-气传质和液-气平衡的力学模型，$d_{ËFF}$）和气液传质系数（K）作为参数。对参数进行了数值求解，显示了在几个温度下的干燥现象。据观察，提出的模型行之有效，$d_{ËFF}$K和K是温度依赖性的，活化能分别为5.904 kJ / mol和13.857 kJ / mol。包封的产率（wb）为16.24-18.29％，包封的生产率为84.17-96.01％，产品中的原花青素含量为9.113-9.227 mg / g。