Abstract

The results of numerical simulation and experimental study of heat and mass transfer in a stationary blown layer of colloidal capillary-porous materials of plant origin with cyclic radiation convective energy supply were presented. The mathematical model consists of the equations of gas phase mass conservation, filtration, and heat and mass transfer in phases, which allow for the internal resistance to heat and moisture transfer in particles when determining the heat and mass transfer coefficients. It includes the dependence of the specific heat of phase transition on particle moisture, particle shrinkage, and layer height during dehydration and the dependence of the effective coefficients of thermal conductivity of gas and vapor diffusion on the filtration rate. The results of modeling of dehydration of potato particles in a dense layer with cyclic radiation-convective energy supply were presented. It was shown that dehydration can be intensified and its duration can be reduced in comparison with the convective method. The calculated data were compared with the experimental data, confirming the adequacy of the model. The experimental kinetic dependences of desorption of activated carbon and zeolite with convective and radiation-convective energy supply were presented. The results of comparison indicate that the duration of desorption is markedly reduced when additional infrared irradiation is provided; for activated carbon, the process time is halved.

中文翻译：

---

不稳定辐射-对流供能条件下胶体和吸附毛细管-多孔材料脱水过程中致密层的传热传质

摘要

介绍了循环辐射对流供能的植物源胶体毛细多孔材料静止吹塑层中传热传质的数值模拟和实验研究结果。数学模型由气相质量守恒方程、过滤方程和相传热传质方程组成，在确定传热传质系数时，考虑到颗粒中传热和传湿的内阻。它包括相变比热对脱水过程中颗粒水分、颗粒收缩和层高的依赖性，以及气体和蒸汽扩散的有效导热系数对过滤速率的依赖性。介绍了循环辐射-对流供能下马铃薯颗粒在致密层中的脱水建模结果。结果表明，与对流法相比，可以加强脱水，缩短脱水时间。将计算数据与实验数据进行比较，证实了模型的充分性。提出了对流和辐射对流能量供应对活性炭和沸石的解吸的实验动力学依赖性。比较结果表明，当提供额外的红外辐射时，解吸持续时间显着减少；对于活性炭，处理时间减半。结果表明，与对流法相比，可以加强脱水，缩短脱水时间。将计算数据与实验数据进行比较，证实了模型的充分性。提出了对流和辐射对流能量供应对活性炭和沸石的解吸的实验动力学依赖性。比较结果表明，当提供额外的红外辐射时，解吸持续时间显着减少；对于活性炭，处理时间减半。结果表明，与对流法相比，可以加强脱水，缩短脱水时间。将计算数据与实验数据进行比较，证实了模型的充分性。提出了对流和辐射对流能量供应对活性炭和沸石的解吸的实验动力学依赖性。比较结果表明，当提供额外的红外辐射时，解吸持续时间显着减少；对于活性炭，处理时间减半。比较结果表明，当提供额外的红外辐射时，解吸持续时间显着减少；对于活性炭，处理时间减半。比较结果表明，当提供额外的红外辐射时，解吸持续时间显着减少；对于活性炭，处理时间减半。