摘要
建立了含绝缘体物料的食品欧姆加热模型,物料模型物由材料性质均一的导电组分和绝缘组分两部分构成,导电组分的电导率与温度成线性关系,加热过程中施加的电压恒为220V.利用有限元的方法求解加热过程中模型的温度场和电场方程,模拟分析了物料的热传导率及物料对环境的传热系数对欧姆加热温度场的影响.结果表明:食品欧姆加热过程中,温度场的冷点不仅和物料的电导率有关,而且还受加热过程中传热现象的影响.
A food ohmic heating model containing an insulator material was established, and the model consis- ted of a conductive component and an insulation component with the uniform material property. The electrical conductivity of the conductive component was linear with the temperature, and a 200 V constant voltage was applied in the heating process. The temperature field and electrical field equations of the model were solved by the use of finite element method, and the effects of the thermal conductivity and the heat transfer coefficient of the material on the temperature field during ohmic heating were simulated and analyzed. The results show that the cold spot of the temperature field is not only related to the electrical conductivity of the material but also affected by the heat transfer.
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2010年第1期63-66,70,共5页
Journal of Henan University of Technology：Natural Science Edition
关键词
欧姆加热
温度场
热传导率
传热系数
ohmic heating
temperature field
thermal conductivity
heat transfer coefficient
