Effect of Complex Parameters of Porous Media on Desalination Performance in Air-Gap Diffusion Distillation Based on Multiple Regression Analysis

作     者：CHEN Lele WANG Ping ZHANG Xuan QIU Qinggang CHEN Lele;WANG Ping;ZHANG Xuan;QIU Qinggang

作者机构：Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationSchool of Energy and Power EngineeringDalian University of TechnologyDalian 116024China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2022年第31卷第6期

页      面：2329-2345页

核心收录：

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：financially supported by the National Natural Science Foundation of China(No.52176060,No.51876023) Dalian University of Technology 2021 Large-scale Instrument and Equipment Open Fund(No.DUTKFJJ2021041,No.DUTKFJJ2021044) 

主　　题：Air-Gap Diffusion Distillation(AGDD) stepwise regression analysis evaporation super hydrophilic porous media desalination 

摘      要：Air-Gap Diffusion Distillation(AGDD) is a new technology aiming at solving the problem of the safety of drinking water for residents in remote areas that uses a super hydrophilic porous medium as the hot channel and evaporation surface. In the experiment, it was found that the parameters of porous media have a significant influence on the desalination(evaporation) efficiency of AGDD. Although porous media are widely used as evaporation components, the factors affecting their evaporation efficiency are not fully understood. The evaporation process in super hydrophilic porous media is rarely discussed. A large number of experiments have been carried out based on AGDD. The introduction of statistical methods solves the problem that experiments cannot distinguish the contribution of complex parameters of porous media to evaporation efficiency. Stepwise regression analysis is used to reduce the dimensionality of the independent variables and construct regression equations(coefficient of determination R~2 reached 81.3%-96.8%). Evaporation flux correlations and dimensionless mass transfer correlations are established based on porous media parameters. We found that the surface evaporation of super hydrophilic porous media can be divided into three stages: diffusion evaporation, capillary evaporation, and thermal evaporation. The evaporation efficiency of these three stages is controlled by the vapor diffusion process resistance, capillary force, and energy supply. At low saturation, evaporation efficiency is limited by the resistance of the vapor diffusion process. The evaporation efficiency of the porous media is affected predominantly by the pore size, the specific surface area, porosity and the characteristic length. At high saturation, the evaporation efficiency becomes influenced primarily by the permeability. A small thickness and a high hydrophilicity also improve the evaporation efficiency.