The influence of voltage and air flow velocity of combined convective-electrohydrodynamic drying system on the kinetics and energy consumption of mushroom slices
The influence of voltage and air flow velocity of combined convective-electrohydrodynamic drying system on the kinetics and energy consumption of mushroom slices
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DOI：
10.1016/j.jclepro.2015.02.033
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发表时间：
2015-05
影响因子：
11.1
通讯作者：
Somayeh Taghian Dinani;M. Havet
中科院分区：
文献类型：
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作者：
Somayeh Taghian Dinani;M. Havet
电流体动力学（EHD）是一种很有前途的降低对流干燥过程能耗的方法。在这项研究中，一个联合对流EHD干燥系统的设计，建造，并检查作为一个经济的干燥系统干燥蘑菇片。研究了两种速度（0.4和2.2 m/s）和四种电压（0、20、25和30 kV）对EHD系统（SECEHD）、对流系统（SECtunnel）和对流-EHD联合系统（SECtotal）干燥动力学、干燥速率、最终含水率和比能耗的影响。结果证实，通过在0.4m/s的空气流速下施加电场，干燥速率的增强随着所施加的电压而增加。30 kV电压和0.4 m/s风速的组合可以显著提高对流-EHD组合系统的干燥速率，同时降低比能耗。然而，具有2.2 m/s的高速横流减弱了电晕风效应。结果表明，随着电压的降低，速度的增加，SECEHD减小，但SECtunnel和SECtotal随着速度的减小而减小。事实上，30 kV-0.4 m/s处理导致与0 kV-2.2 m/s、20 kV-2.2 m/s、25 kV-2.2 m/s和30 kV-2.2 m/s处理在统计学上相似的平均干燥速率和最终水分含量，但与它们相比，它代表了相当小的SEC总值。因此，电场强度与空气流速的适当组合，如30 kV-0.4 m/s处理是一种有前途的解决方案，用于减少使用对流干燥技术的工业的大量能源消耗。
Electrohydrodynamic (EHD) is a promising process for reducing the energy consumption of convective drying processes. In this study, a combined convective-EHD drying system was designed, constructed, and examined as an economical drying system for drying mushroom slices. The effects of two levels of velocities (0.4 and 2.2 m/s) and four levels of voltages (0, 20, 25, and 30 kV) on drying kinetics, drying rate, final moisture content, and specific energy consumption of EHD system (SECEHD), convective system (SECtunnel), and combined convective-EHD system (SECtotal) were studied. The results confirmed that by applying electric field at 0.4 m/s air velocity, the enhancement in the drying rate increased with the applied voltage. The combination of 30 kV voltage with the air velocity of 0.4 m/s could significantly increase the drying rate and simultaneously reduce the specific energy consumption of the combined convective-EHD system. However, a cross-flow with the high velocity of 2.2 m/s diminished corona wind effect. Results showed that increasing velocity alongside decreasing voltage reduced the SECEHD, but SECtunneland SECtotaldeclined as velocity diminished. In fact, 30 kV-0.4 m/s treatment resulted in statistically similar averaged drying rate and final moisture content to 0 kV-2.2 m/s, 20 kV-2.2 m/s, 25 kV-2.2 m/s, and 30 kV-2.2 m/s treatments, but it represented considerably less SECtotalvalue in comparison to them. As such, the appropriate combination of electric field intensity with air velocity such as 30 kV-0.4 m/s treatment is a promising solution for reducing the substantial energy consumption of industries using convective drying technique.