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首页> 外文期刊>Food Science and Technology International >Application of transfer functions to canned tuna fish thermal processing.
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Application of transfer functions to canned tuna fish thermal processing.

机译：传递函数在金枪鱼罐头热处理中的应用。

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摘要

Design and optimization of thermal processing of foods need accurate dynamic models to ensure safe and high quality food products. Transfer functions had been demonstrated to be a useful tool to predict thermal histories, especially under variable operating conditions. In this study, a dynamic model (discrete transfer function) was developed and experimentally validated for the thermal processing of tuna fish in steam retorts. Transfer function coeff. were obtained numerically, using commercial software of finite elements (COMSOL Multiphysics) to solve the heat transfer balance. Dependence of transfer function coeff. on the characteristic dimensions of cylindrical containers (diam. and height) and on the sampling interval were observed. A simple equation, with 2 empirical parameters that depend on the container dimensions, represented the behaviour of transfer function coeff. with very high degree of accuracy. Experimental runs with different size containers and different external conditions (constant and variable retort temp.) were carried out to validate the developed methodology. Performance of the thermal process simulation was tested for predicting internal product temp. of the cold point and lethality and very satisfactory results were found. It is suggested that the developed methodology could play an important role in reducing computational effort while guaranteeing accuracy by simplifying the calculus involved in the solution of heat balances with variable external conditions, and represents a potential novel approach to the implementation of new food control strategies leading not only to more efficient processes but also to product quality and safety.
机译：食品热处理的设计和优化需要准确的动态模型，以确保安全优质的食品。传递函数已被证明是预测热历史的有用工具，尤其是在变化的工作条件下。在这项研究中，开发了动态模型（离散传递函数），并通过实验验证了蒸汽蒸煮t鱼的热处理。传递函数系数。使用有限元商业软件（COMSOL Multiphysics）数值求解热传递平衡。传递函数系数的依赖性。观察圆柱形容器的特征尺寸（直径和高度）以及采样间隔。一个简单的方程式，具有2个取决于容器尺寸的经验参数，表示传递函数coeff的行为。具有很高的准确性。在不同尺寸的容器和不同的外部条件（恒定和可变的蒸馏温度）下进行了实验，以验证所开发的方法。测试了热过程仿真的性能以预测内部产品温度。发现了冷点和致死性，结果非常令人满意。建议开发的方法可以通过简化涉及可变外部条件的热量平衡解决方案所涉及的演算，在减少计算量的同时确保准确性的过程中扮演重要角色，并且代表了一种潜在的新颖方法，可用于实施新的食品控制策略不仅要提高效率，还要提高产品质量和安全性。

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