数字农科院2.0

Graphene far-infrared drying of wheat: Mass transfer behavior

文献类型： 外文期刊

作者： Jianchun Yan;Qing Zhao;Jiyou An;Hai Wei;Kunjie Chen;Huanxiong Xie

作者机构：

关键词： Drying kinetics;Drying rate;Effective moisture diffusivity;Mass transfer coefficient;Moisture ratio;Wheat

期刊名称： International Communications in Heat and Mass Transfer

ISSN： 0735-1933

年卷期： 2025 年 167 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Post-harvest wheat drying necessitates technologies that balance efficiency and quality preservation. While graphene far-infrared (g-FIR) drying offers advantages over conventional methods, its industrial application is hindered by insufficient understanding of dynamic mass transfer behavior and parametric interdependencies. This study systematically investigates transient moisture transfer mechanisms during g-FIR drying of wheat under varying irradiation temperatures (40–70 °C), airflow temperatures (30–60 °C), superficial velocities (0.208–0.521 m/s), and mass throughput rates (6–10 kg/min). The Midilli et al. model demonstrated superior accuracy (R2 > 0.999) in characterizing biphasic drying kinetics, revealing time-dependent transitions in drying rates and effective moisture diffusivity. Results identified critical thresholds for avoiding surface crusting: an optimal airflow velocity (0.416 m/s) balanced vapor removal and thermal retention, while elevated g-FIR irradiation (60–70 °C) and throughput rates (8–10 kg/min) maximized drying rate. The effective moisture diffusivity progressively increased over time, typically reaching peak values ranging from 8.53 × 10−10 to 2.45 × 10−9 m2/min at the final stage, governed by vapor-phase dominance and structural densification. Convective mass transfer coefficients increased 62.5 % with airflow velocity due to boundary layer thinning and turbulence intensification. This work establishes operational guidelines for scaling g-FIR drying while resolving prior limitations of constant-parameter assumptions.

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