Simulations and Experiments of Soil Temperature Distribution after 2.45 GHz Long-Term Microwave Treatment

文献类型： 外文期刊

第一作者： Sun, Xiaohe

作者： Sun, Xiaohe;Yang, Shuo;Ma, Haolin;Zhai, Changyuan;Sun, Xiaohe;Zhao, Chunjiang;Sun, Xiaohe;Zhao, Chunjiang;Yang, Shuo;Ma, Haolin;Zhai, Changyuan

作者机构：

关键词： long-term microwave; soil disinfection; temperature field; soil type; heating law

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.408； 五年影响因子：3.459 ）

ISSN：

年卷期： 2022 年 12 卷 7 期

页码：

收录情况： SCI

摘要： Soil disinfection is an important agronomic measure to prevent soil-borne diseases, insects, weeds and other hazards. Based on the premise of being environmentally friendly, microwave soil disinfection can improve crop yield and quality in a pollution-free, residue-free and green way. The law of microwave soil heating is the theoretical basis of microwave soil disinfection. Therefore, in this paper, loess soil of North China and black soil of Northeast China are used as test materials to explore the law of soil heating under the action of microwaves. First, COMSOL Multiphysics software was used to simulate the temperature field change in the microwave-irradiated soil, and a simulation model of the temperature field of the microwave-irradiated soil was constructed to analyze the effective working range and temperature distribution characteristics of the microwave-irradiated soil. Second, using the 2.45 GHz microwave treatment, the following conditions were tested: soil moisture conditions of 10%, 15%, 20% and 23% (within the natural moisture content range). The loess and black soil were treated by microwave irradiation for 1 similar to 12 min, respectively (1 min/time increment). A single-factor experiment was designed to explore the influence of these factors on the soil heating law. The results show that the two soil surface temperatures are positively correlated with the soil moisture content, both of which satisfy T-surface23% > T-surface20% > T-surface15% > T-surface10%, and the surface temperature of black soil is higher than that of loess. According to the experimental results of the internal temperature distribution of loess and black soil irradiated by microwaves, the surface equations of "irradiation time-soil depth-soil temperature" and "irradiation time-soil moisture content-soil temperature" were constructed by surface fitting. When the irradiation time and moisture conditions are the same, the average temperature inside the irradiation area satisfies (T) over bar (alpha black soil) > (T) over bar (alpha loess). The results of long-term microwave soil heating preliminarily confirmed the feasibility of microwave soil disinfection and the optimal conditions of microwave irradiation in loess of North China and Northeast black soil, which provides a certain reference for the study of soil-borne diseases inactivation at high temperature.

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