Abstract

The absorption of electromagnetic energy by a plate in the high- and superhigh-frequency bands is considered. Linear (at constant process parameters) problems of heating the plate using these types of energy input under convective drying conditions with the convective heat- and mass-transfer with the gaseous environment are formulated and analytically solved both in the general case and for drying at the first stage. In the former case, the drying intensity is described based on the analytical solution of the mass-transfer (moisture diffusion) problem under the condition that the phase transformations occurred at the surface of the body. For the drying process at the first stage, it is assumed that all the heat that was input to the body was consumed for moisture evaporation, because of which the body was not heated, and that the partial vapor pressure at the surface of the plate was equal to the saturated vapor pressure at the temperature of the surface of the pressure. The temperature dependence of the saturated vapor pressure was described by the Antoine equation. The heating problems were solved for the local and average-plate-volume temperature. Based on the solutions, the heating of the body and its effect on the drying kinetics were numerically modeled, which demonstrated the validity of the equations. The change in the process parameters in the course of the process was proposed to be calculated by a zonal piecewise step method.

中文翻译：

---

连续高频和超高频电磁场中板的干燥过程中的传热和传质

摘要

考虑了板在高和超高频带中对电磁能量的吸收。提出了线性（在恒定的工艺参数下）在对流干燥条件下使用这些类型的能量输入对板进行加热的对流问题，并在气态环境下进行对流传热和传质，并通过解析解决了这两种问题第一阶段。在前一种情况下，基于在身体表面发生相变的条件下的传质（水分扩散）问题的解析解来描述干燥强度。对于第一阶段的干燥过程，假设输入到人体的所有热量都被消耗掉了，从而蒸发了水分，因此人体没有被加热，且板表面的部分蒸气压等于压力表面温度下的饱和蒸气压。饱和蒸气压的温度依赖性由Antoine方程描述。解决了局部和平均板体积温度的加热问题。在此基础上，对物体的加热及其对干燥动力学的影响进行了数值模拟，证明了方程的有效性。建议在工艺过程中工艺参数的变化通过分区分段步骤法进行计算。解决了局部和平均板体积温度的加热问题。在此基础上，对物体的加热及其对干燥动力学的影响进行了数值模拟，证明了方程的有效性。建议在工艺过程中工艺参数的变化通过分区分段步骤法进行计算。解决了局部和平均板体积温度的加热问题。在此基础上，对物体的加热及其对干燥动力学的影响进行了数值模拟，证明了方程的有效性。建议在工艺过程中工艺参数的变化通过分区分段步骤法进行计算。