Study on the heat transfer in different aquifer media with different groundwater velocities during thermal conductive he
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RESEARCH ARTICLE
Study on the heat transfer in different aquifer media with different groundwater velocities during thermal conductive heating He Sun 1 & Xueming Qin 1 & Xinru Yang 1 & Yongsheng Zhao 1 Received: 11 June 2019 / Accepted: 29 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In situ thermal remediation can rapidly remove volatile organic pollutants, regardless of permeability or heterogeneity in the subsurface, which has received more attention in recent years. This study aims at investigating the heat transfer during thermal conduction heating (TCH), a heating method of in situ thermal remediation. The experiments were performed in a 134.5-cm tall × 107.5-cm wide × 7.5-cm thick tank containing a heating resistance to heat the aquifer and 62 thermocouples to measure temperature. The temperature of the points was recorded in real time through a multi-channel temperature patrol instrument. Then, isotherms were drawn, which were quantitatively analyzed from the aspects of temperature distribution, heated zone area, heat transfer distance, and influencing radius. The influence of groundwater velocity, aquifer medium, and heating resistance power was investigated. The results show the following: (1) The quantitative analysis proved that the higher the groundwater velocity, the faster the heated zone reaches a stable state. (2) The heated zone area in a coarse/fine sand aquifer is larger than that in a medium sand aquifer, and the stable time of the heated zone is in the order of fine sand < coarse sand < medium sand. (3) The greater the heating resistance power is, the more rapidly the heated zone reaches a stable state. (4) It has been quantitatively concluded that the V-shaped distribution of the heated zone is more obvious at a high groundwater velocity or with a high-power heating resistance. These findings are significant for the practical application of Thermal conduction heating. Keywords ISTR . Thermal conduction heating . Heat transfer . Temperature distribution . Homogeneous aquifer
Introduction In situ thermal remediation (ISTR) is the process of heating soil and groundwater to increase the mobility of harmful chemicals, allowing them to move through the soil and groundwater toward extraction wells, where they are collected and transported to the surface for disposal by other technical means. Some pollutants are destroyed underground during
Responsible editor: Philippe Garrigues Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09131-2) contains supplementary material, which is available to authorized users. * Yongsheng Zhao [email protected] 1
Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, People’s Republic of China
heating. Thermal treatment is described as “in situ” because the heat is directly applied underground to the contaminated area. At present, DNAPLs are amo
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