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Simulation of mass and heat transfer of Quercus leaf particles during hydrothermal extraction
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2022-07-08 , DOI: 10.1002/cjce.24536 Xiangyu Gao 1 , Chensi Guo 1 , Junying Chen 1, 2 , Lijun Wang 3 , Xiaoling Zhao 1, 2 , Chun Chang 1, 2 , Xiuli Han 1, 2 , Jiande Song 4
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2022-07-08 , DOI: 10.1002/cjce.24536 Xiangyu Gao 1 , Chensi Guo 1 , Junying Chen 1, 2 , Lijun Wang 3 , Xiaoling Zhao 1, 2 , Chun Chang 1, 2 , Xiuli Han 1, 2 , Jiande Song 4
Affiliation
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Mass and heat transfer models of Quercus leaf particles during hydrothermal extraction were developed in COMSOL Multiphysics. The main physical properties used in the model were measured. The results showed that the average particle size was 116.7 μm, and after soaking in water for 24 h, the average particle size increased to 127.3 μm. However, the average particle size increased from 116.7 to 132.8 μm after soaking in a 60% (v/v) ethanol solution for 40 min, and decreased to 127.3 μm after 60 min. The Quercus leaf particles have a higher ability to absorb ethanol solution than water. The simulations showed that it took 3.2 s for the ethanol concentration and 0.5 s for the temperature in the particles to tend stably after soaking in a 60% (v/v) ethanol solution at 40°C. From the edge of the particle to the centre, the increasing rates of ethanol concentration and temperature gradually slowed down, while the changing rates of the centre accelerated with the increase in solution concentration and temperature, respectively. When the particles soaked at the lowest concentration, the central concentration first reached stability, and at the lowest temperature, the centre temperature first stabilized.
中文翻译：
水热提取过程中栎叶颗粒传质传热的模拟
在 COMSOL Multiphysics 中开发了水热提取过程中栎叶颗粒的传质传热模型。测量了模型中使用的主要物理特性。结果表明，平均粒径为116.7 μm，在水中浸泡24 h后，平均粒径增加到127.3 μm。然而，在 60% (v/v) 乙醇溶液中浸泡 40 分钟后，平均粒径从 116.7 增加到 132.8 μm，并在 60 分钟后减少到 127.3 μm。栎叶颗粒比水具有更高的吸收乙醇溶液的能力。模拟表明，在 40°C 的 60% (v/v) 乙醇溶液中浸泡后，乙醇浓度需要 3.2 秒，颗粒温度需要 0.5 秒才能趋于稳定。从粒子的边缘到中心，随着溶液浓度和温度的升高，乙醇浓度和温度的增加速率逐渐减慢，而中心的变化速率分别加快。当粒子浸泡在最低浓度时，中心浓度首先达到稳定，而在最低温度时，中心温度首先稳定。
更新日期：2022-07-08
中文翻译：
水热提取过程中栎叶颗粒传质传热的模拟
在 COMSOL Multiphysics 中开发了水热提取过程中栎叶颗粒的传质传热模型。测量了模型中使用的主要物理特性。结果表明，平均粒径为116.7 μm，在水中浸泡24 h后，平均粒径增加到127.3 μm。然而，在 60% (v/v) 乙醇溶液中浸泡 40 分钟后，平均粒径从 116.7 增加到 132.8 μm，并在 60 分钟后减少到 127.3 μm。栎叶颗粒比水具有更高的吸收乙醇溶液的能力。模拟表明，在 40°C 的 60% (v/v) 乙醇溶液中浸泡后，乙醇浓度需要 3.2 秒，颗粒温度需要 0.5 秒才能趋于稳定。从粒子的边缘到中心，随着溶液浓度和温度的升高，乙醇浓度和温度的增加速率逐渐减慢，而中心的变化速率分别加快。当粒子浸泡在最低浓度时，中心浓度首先达到稳定，而在最低温度时，中心温度首先稳定。
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