The drying of biomass particles is an important industrial process where heat and mass transfer simultaneously occur. Following on from our previous work on convective heat transfer, here we report experimental results obtained by analysing the mass transfer between the gas and the surface of the wood particles, during drying in a mechanically stirred fluidised bed. It is assumed that, during the constant drying rate period, the moisture concentration of the gas on the surface of the particle is constant. The results have allowed us to obtain a correlation between the Sherwood number and the Reynolds number in the range of Rep between 102 and 257; the proposed correlation Shgp = Shgp (Rep) predicts the surface mass transfer coefficient with an average deviation of 30% in relation to experimental data.

中文翻译：

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流化床中森林生物质颗粒干燥过程中的传质

生物质颗粒的干燥是一个重要的工业过程，其中传热和传质同时发生。继我们之前关于对流传热的工作之后，在这里我们报告了在机械搅拌流化床中干燥过程中通过分析气体和木材颗粒表面之间的传质获得的实验结果。假设在恒定干燥速率期间，颗粒表面上气体的水分浓度是恒定的。结果使我们能够在 Rep 介于 102 和 257 之间的范围内获得舍伍德数和雷诺数之间的相关性；建议的相关性 Shgp = Shgp (Rep) 预测表面传质系数与实验数据的平均偏差为 30%。