食品与机械2018，Vol.34Issue(2)：111-115,5.DOI:10.13652/j.issn.1003-5788.2018.02.024
送风参数对马铃薯泥冷冻特性的影响
Influence of air supply parameters on the freezing process of mashed potatoes
摘要
Abstract
In order to investigate the sensitivity of freezing time to air temperature and velocity,and analyze the variation of the freezing conditions and freezing time of mashed potatoes in different locations,a three-dimensional unsteady numerical model was estab-lished.According to the thermo-physical properties of mashed pota-toes,the process of the temperature decreasing during freezing was simulated by Fluent.The unevenness of freezing conditions and time was obtained under different air velocity-inlet and temperature-inlet. The results showed that the change in the percentage of air tempera-ture-inlet had a greater effect on freezing time than air velocity-inlet. With the increase of the air velocity-inlet,the unevenness of the air velocity around the mashed potatoes increased,and meanwhile the unevenness of the air temperature around the mashed potatoes de-creased.The variation coefficient of temperature among mashed po-tatoes and the unevenness of freezing time firstly increased and then decreased with the increase of air velocity-inlet,and they were mini-mum when the air velocity-inlet was 6 m/s.Under the same air ve-locity-inlet,the in-homogeneity of the temperature around the mashed potatoes is inversely proportional to the air temperature-inlet.The experimental result showed that the simulation data was in good agreement with the experimental data.The relative error of freezing time was 3.27%,and the average absolute error of tempera-ture was 0.79 K,with the root mean square error of 2.11 K.These results reviewed some characteristics of the freezing process of mashed potatoes without packages in an air blast freezer,which could provide a reference value for the optimization of the equipment and technologies for the freezing of foodstuffs.关键词
送风参数/冷冻时间/不均匀度/数值模拟Key words
air supply parameters/freezing time/unevenness/nu-merical simulation引用本文复制引用
岳占凯,万金庆,厉建国..送风参数对马铃薯泥冷冻特性的影响[J].食品与机械,2018,34(2):111-115,5.基金项目
国家高技术研究发展计划(863计划)资助项目(编号:2012AA092301) （863计划）
