COMSOL Modeling of Heat Transfer in SVE Process

Abstract

Non aqueous phase liquid (NAPL) pollution exists in porous media such as soil. SVE technology can be used to remove this pollution in soil. However, few domestic and international studies have paid attention to the changes of soil temperature in the field, which we believe can be useful information to optimize the layout of heating wells. In this research we established partial differential equations of soil heat transfer using the COMSOL multi-field coupling tool to simulate the field distribution of the change in soil internal temperature in the process of SVE to obtain the change of effective heating area with time under certain initial heating conditions. At the same time, we used liquid ethylbenzene to represent NAPL pollutants, and designed a simulation of soil temperature field distribution under the movement of liquid ethylbenzene under external pressure. It was found that under the action of Darcy’s velocity field, the utilization efficiency of the SVE system for the heat source was significantly improved, that is, the temperature distribution of the soil was more uniform. However, the temperature of the heated area increased slowly because the extraction well took away the heat energy. The heat source power should be increased or prolonged to improve the effect of Darcy’s field. Through a coupled simulation, we obtained a variation relationship of the soil temperature field in 1800 min under the action of one extraction well and four heating wells. These data will provide the basis for our next step in designing an algorithm to optimize the distribution of heating wells.

Influence of extraction and injection conditions on the performance of thermal-enhanced soil vapor extraction

“…The heating temperature of the thermal well (Ttw) and the relative humidity (RH) of the injected air are two important parameters in the treatment conditions of a T-SVE system that affect the heating temperature and range of the target soil [13][14][15][16]. Therefore, this section quantitatively assesses the effects of injection conditions on soil temperature and contaminant removal rate.…”

Modeling and Analysis of the Soil Vapor Extraction Equipment for Soil Remediation

“…The gas density ρ was set to 1.205 kg/m 3 as air in the standard state, and the dynamic viscosity µ of air was set to 1.8107 × 10 −5 Pa • s. The inlet pressure was 100 kPa and the outlet pressure was 70 kPa. The porosity p of soil was set to 0.325, and permeability κ was set to 5.5 × 10 −12 m 2 [26].…”

Unsteady Numerical Investigation Strategy of Natural Convection in an Isosceles Superimposed Triangular Enclosure

“…This is accomplished by using a variety of software with varying degrees of efficiency for edge computing and cloud manufacturing applications for technological process monitoring based on digital twins [5]. Accordingly, it was possible to simulate a flexible structure dynamically using MATLAB [6] and other software like COMSOL [7,8], ANSYS [9,10] and Fluent [11]. Obtaining high heat transfer rates through various enhancement techniques can lead to substantial energy savings.…”