This study aims to enhance the fumigation efficiency of SO2 for table grape preservation by comparing differential and at-mospheric pressure fumigation.A computational fluid dynamics(CFD)model using FLUENT software was developed to simulate SO2 dif-ferential pressure fumigation.The simulation results indicated that differential pressure fumigation,driven by pressure differences,exhibi-ted greater vertical flow rates.Therefore,SO2 gas passed through the packaging box faster and distributed more smoothly within the box than atmospheric pressure fumigation.Through comparing the wind speed and SO2 gas distribution,the simulation and experimental results displayed a high degree of agreement.SO2 differential pressure fumigation kept the firmness and suppressed stem browning index,decay rate as well as shattering rate increase.Differential pressure enhanced fumigant utilization efficiency and maintained postharvest quality of table grape.This research offers theoretical support for implementing differential pressure fumigation technology in grape postharvest indus-try.
维普
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