文章摘要
李 慢;刘东红;吕瑞玲;王丹丽;丁 甜;王文骏;周建伟.马铃薯超声解冻过程的数值模拟研究[J].中国食品学报,2019,19(8):130-137
马铃薯超声解冻过程的数值模拟研究
  
DOI:
中文关键词: 超声解冻  数值模拟  COMSOL  温度分布  解冻时间
英文关键词: ultrasonic-assisted thawing  numerical simulation  COMSOL  temperature distribution  thawing time
基金项目:宁波市农业重大项目(2016C11016);国家自然科学基金项目(31371872)
作者单位
李 慢;刘东红;吕瑞玲;王丹丽;丁 甜;王文骏;周建伟 浙江大学生物系统工程与食品科学学院杭州310058浙江大学馥莉食品研究院杭州310058 
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中文摘要:
      为了探究马铃薯超声解冻过程中的温度分布和解冻时间,本文采用有限元分析软件COMSOL对超声解冻马铃薯的过程进行非稳态模拟,并进行试验验证。结果表明:超声解冻模拟值和试验值的RMSE为0.393 ℃,对照组的RMSE为1.192 ℃,表明该模型能较好地模拟超声解冻过程;同时超声解冻能显著提高解冻速率,解冻时间比对照组减少30.9%。在此基础上预测了试验参数对解冻效果的影响:随着马铃薯半径、高度的增加,解冻时间依次增长;随着高度的增加,内部温差依次降低,而半径的变化与温差没有相关性;马铃薯在声场中的位置对解冻效果也有较大的影响,当马铃薯上表面距离探头65 mm时,解冻时间最短,内部温差最小,温度分布较均匀,此时解冻效果最好。需结合实际,优化出最合适的尺寸和位置以达到最好的解冻效果。
英文摘要:
      Ultrasound-assisted thawing has been an innovative and efficient method. To explore the temperature distribution and thawing time of ultrasonic-assisted thawing process, in this paper, an unsteady mathematical model was established to simulate the heat transfer process of ultrasound-assisted thawing by using finite element-based commercial software COMSOL. Results showed that the RMSE was 0.393 ℃ in the ultrasound-assisted thawing process, in the control RMSE was 1.192 ℃. It proved that this model agrees with the experiment well. At the same time, ultrasound-assisted thawing can significantly improve the thawing rate, thawing time was reduces by 30.9% compared to the control. Based on the good prediction of model, we investigated the influence of several design parameters on the thawing effects. With the increase of the radius and height of potato, thawing time increased, but there was no linear relationship between temperature difference and size. The position of potato in the sound field also had great influence on the thawing effect. When the distance between the upper surface of potato and ultrasound probe was 65mm, the thawing time and temperature difference were the least. Therefore, in order to achieve the best thawing effect, it is necessary for us to consider the specific conditions to optimize the best size and placement position.
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