固液混装罐头食品的传热规律

<正> 一 前言 罐头食品的加热曲线有两种类型;简单型加热曲线和转折型加热曲线(Ball,1957;8tumbo,1973)。简单型加热曲线是由初始曲线部分和一条半对数直线组成,转折型加热曲线则是由初始曲线部分和一条以上的半对数直线组成。一般认为传导加热食品和对流加热食品呈现简单型加热曲线,传导和对流混合加热食品呈现转折型加热曲线,呈现转折型加热曲线的固液混装食品常常是由于在加热过程中食品中淀粉或其它增稠剂析出,汤汁粘度增

Thermal Characteristic of Solid and Liquid Mixed Canned Food

Thermal characteristics of canned food mixed with solid and liquid has been experimentally studied. It was found that,the brocken heating curye is inherent feature of this-kind canned food. Therefore, the classical ezplaination of heat transfer mechanism of solid and liquid mixed canned food was extended. In addition, the effect of heat transfer determination method of using production retort on heating curve was examined.It was noted that the shape of heating curve was different when compared to the instant heating method. So that, the thermal parameters were different. However, the innate character of heat transfer does't change. A further research is needed on theoretical mechanism oi the fact that solid and liquid mixed canned food appears brocken heating curve.