An appropriate microenvironment for preserving cultural relics is essential,and the air-water direct contact tech-nology is utilized to create the microenvironment recently.The influence of a deflector in a tank was n...An appropriate microenvironment for preserving cultural relics is essential,and the air-water direct contact tech-nology is utilized to create the microenvironment recently.The influence of a deflector in a tank was numerically investigated based on uniform design method to improve the heat and mass transfer and pressure drop perfor-mance of the air-water direct tank.In this study,a simplified CFD-based model was established and validated between airstream and water surface within the tank,to analyze the heat and mass transfer and pressure drop processes.Meanwhile,regression models of the heat transfers rate,mass transfer rate and pressure drop were developed by uniform design method based on three parameters:installation position,tilt angle,and height of the deflector,in order to analyze the influences of these three parameters on the heat and mass transfer and pressure drop of the tank.Finally,all three optimal structural parameters of the deflector were obtained based on the proposed comprehensive evaluation index using a genetic algorithm.The results showed that the model established for air-water direct contact adopted well to predict the heat and mass transfer and pressure drop per-formance between airstream and still water surface.Furthermore,the results found that the flow field inside the water tank was affected by the deflector’s structure,which affected the heat and mass transfer performance.The simulation results suggested that the deflector’s optimal structural parameters are 8 mm of installation position,88°of tilt angle and 19 mm of height,respectively,within a given extent in this study.展开更多
基金This present work was supported by the National Natural Science Foundation of China(51636007)the N Cultural Relics Protection Science and Technology Program of Zhejiang Province(No.2020009).No conflict of interest exists in submitting this manuscript,and all au-thors approve the manuscript for publication.
文摘An appropriate microenvironment for preserving cultural relics is essential,and the air-water direct contact tech-nology is utilized to create the microenvironment recently.The influence of a deflector in a tank was numerically investigated based on uniform design method to improve the heat and mass transfer and pressure drop perfor-mance of the air-water direct tank.In this study,a simplified CFD-based model was established and validated between airstream and water surface within the tank,to analyze the heat and mass transfer and pressure drop processes.Meanwhile,regression models of the heat transfers rate,mass transfer rate and pressure drop were developed by uniform design method based on three parameters:installation position,tilt angle,and height of the deflector,in order to analyze the influences of these three parameters on the heat and mass transfer and pressure drop of the tank.Finally,all three optimal structural parameters of the deflector were obtained based on the proposed comprehensive evaluation index using a genetic algorithm.The results showed that the model established for air-water direct contact adopted well to predict the heat and mass transfer and pressure drop per-formance between airstream and still water surface.Furthermore,the results found that the flow field inside the water tank was affected by the deflector’s structure,which affected the heat and mass transfer performance.The simulation results suggested that the deflector’s optimal structural parameters are 8 mm of installation position,88°of tilt angle and 19 mm of height,respectively,within a given extent in this study.
