Study on a Moisture Ratio Curve Model for Refractance Window Drying Based on a D-Optimal Mixture Design

IF 2.6 3区 农林科学 Q2 FOOD SCIENCE & TECHNOLOGY
Jingyu He, Weidong Song, Jianqiang Li, Tianhang Ding, Jian Guan, Jinji Wu, Jiaoling Wang
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Abstract

Refractance window (RW) drying is a new thin-layer drying technology that can control well the heating temperature to effectively reduce the loss of heat-sensitive substances. Here, an experiment on tomato pulp drying was carried out to study the drying characteristics of RW drying based on a D-optimal mixture design. The fitting of the classical model of thin-layer drying was studied, and SAS and 1stOpt calculation software were used to analyze the test data. The result showed that the RW drying equipment could dry 8 mm of tomato pulp in 120 min, and the maximum drying speed could reach 0.40 g/(g·min). Based on an effective diffusion coefficient under different conditions, the activation energy was 27.35 kJ/mol at an air speed of 3 m/s. When comparing the fitting of the moisture ratio curve in four classic thin-layer drying models, it was found that the R-square value of the modified Page model was 0.9960, which had better fitting properties. Then, the polynomial fitting model of thin-layer drying reflects the regression relationship between the coefficient of the classic model and drying conditions including temperature, wind speed, and time. After comparison with the classic model and validation experiment, the results showed that there is no significant difference between the polynomial fitting model and the validations under a confidence level of 0.95, which could well predict the change in the water content ratio over time under different conditions.

Abstract Image

基于 D 型最佳混合物设计的折射窗干燥水分比曲线模型研究
折射窗(RW)干燥是一种新型的薄层干燥技术,能很好地控制加热温度,有效减少热敏性物质的损失。本文以番茄浆干燥为实验对象,基于 D-最优混合物设计研究了 RW 干燥的干燥特性。研究了薄层干燥经典模型的拟合情况,并使用 SAS 和 1stOpt 计算软件对试验数据进行了分析。结果表明,RW 干燥设备可在 120 分钟内干燥 8 mm 的番茄浆,最大干燥速度可达 0.40 g/(g-min)。根据不同条件下的有效扩散系数,在风速为 3 m/s 时,活化能为 27.35 kJ/mol。在比较四种经典薄层干燥模型的水分比曲线拟合情况时,发现修正的佩奇模型的 R 方值为 0.9960,具有更好的拟合性能。然后,薄层干燥的多项式拟合模型反映了经典模型的系数与温度、风速和时间等干燥条件之间的回归关系。经过与经典模型和验证实验的比较,结果表明在置信度为 0.95 的条件下,多项式拟合模型与验证模型之间没有显著差异,可以很好地预测不同条件下含水率随时间的变化。
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来源期刊
Journal of Food Quality
Journal of Food Quality 工程技术-食品科技
CiteScore
5.90
自引率
6.10%
发文量
285
审稿时长
>36 weeks
期刊介绍: Journal of Food Quality is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles related to all aspects of food quality characteristics acceptable to consumers. The journal aims to provide a valuable resource for food scientists, nutritionists, food producers, the public health sector, and governmental and non-governmental agencies with an interest in food quality.
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