A model for heating of liquid -particle mixtures in a continuous flow ohmic heater

• Main Authors: Li-Kai Chen, 陳立凱
• Other Authors: Yeun-Chung Lee
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/17111941772119054068

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 90 === ABSTACT In ohmic heating, the temperature of liquid -particle mixtures affects the quality of food. Understanding the temperature history of mixtures in process would be helpful to apply ohmic heating. In this search, we use exact solution incorporated with numerical analysis to build a model for heating of liquid-particle mixtures in a continuous flow ohmic heater and to compute the temperature history with solid and liquid phases. Simulations show that the temperature of mixtures with higher electrical conductivity particulates rises faster than that with lower electrical conductivity particulates. With the increase of solid contents in the mixtures, a particle’s electrical resistance within a circuit will be a significant component of the overall resistance. The solid will likely heat faster than the liquid. High solid content mixtures in Ohmic heating will promote more uniform temperature distribution inside the particle and might be promising. Keywords: ohmic heating, mathematic model, liquid-particle mixtures.