Reassessment of Thin-Layer Drying Models for Foods: A Critical Short Communication
Abstract
:1. Introduction
2. Types of Drying Curves
3. Modification of the Models
4. Models That Require Transformation
5. Use of Complex Models for Drying Data
6. Models Proposed for Drying of Foods
- (i)
- Models that require transformed data;
- (ii)
- Complex models or models that have more than three parameters;
- (iii)
- Models that have the same fit with another model but have more parameters.
7. Conclusions
- –
- The arbitrary use of thin-layer drying models should be avoided;
- –
- Complex models, most of the time, result in insignificant parameters;
- –
- Models with two adjustable parameters work well for drying data;
- –
- Logarithmic transformation generates heteroscedastic data and should not be used.
- The simplest possible model that can describe the data should be considered as the best model (known as Ockham’s razor or rule of parsimony). Most drying data can be described with the two-parameter models. Therefore, it is best to try them first. More complex models should only be used if the simple model is not adequate to describe the data;
- Two different forms of the same models (having the same number of parameters) should not be used together because they are not rival models but the same models with different mathematical structures. The one that has less uncertainty on parameters and also a correlation between the parameters could be preferred;
- Parameters should also be listed together with their standard errors or confidence intervals, since uncertainties could also give information on the parameters’ significance;
- The meaning of the parameters and the effect of their values on the curve’s shape should be well known, even if the model used is an empirical one;
- The R2 alone is not adequate to compare the models, and the RMSE and residuals should also be used to compare the models with the same number of parameters. A comparison of the models that have a different number of parameters (i.e., comparing a three-parameter model with a two-parameter model) may require different analyses, such as the F-test.
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample | T (°C) | Air Velocity (m/s) | Thickness (mm) | Page | Modified Page | R2 | RMSE | Reference |
---|---|---|---|---|---|---|---|---|
Apple | 50 | 1.3 | 5.0 | k = 0.0023 ± 0.0003 n = 1.3182 ± 0.0295 | K = 0.0098 ± 0.0001 n = 1.3182 ± 0.0295 | 0.9988 | 0.0142 | [22] |
Apricot | 70 | 0.5 | Whole fruit | k = 0.0018 ± 0.0002 n = 1.1445 ± 0.0226 | K = 0.0039 ± 5.3 × 10−5 n = 1.1445 ± 0.0226 | 0.9963 | 0.0216 | [23] |
Peach | 65 | 0.8 | 3.5 | k = 0.0083 ± 0.0019 n = 1.1237 ± 0.0519 | K = 0.0141 ± 0.0004 n = 1.1237 ± 0.0519 | 0.9973 | 0.0196 | [24] |
Peach | 60 | 0.946 | 3.0 | k = 0.0227 ± 0.0023 n = 1.1102 ± 0.0288 | K = 0.0331 ± 0.0005 n = 1.1102 ± 0.0288 | 0.9960 | 0.0192 | [19] |
Pear | 80 | 1.3 | 5.0 | k = 0.0042 ± 0.0007 n = 1.3205 ± 0.0395 | K = 0.0158 ± 0.0003 n = 1.3182 ± 0.0295 | 0.9984 | 0.0175 | [22] |
Parameter | Estimate | Standard Error | p Value |
---|---|---|---|
a | 0.3369 | 0.0406 | <0.0001 |
k | 0.0343 | 0.0869 | 0.6994 |
b | 0.3486 | 0.0580 | <0.0001 |
g | 0.0343 | 0.3713 | 0.9278 |
c | 0.3364 | 0.0580 | <0.0001 |
h | 0.0343 | 0.3583 | 0.9251 |
Parameter | Estimate | Standard Error | p Value |
---|---|---|---|
a | 0.5134 | 0.0380 | <0.0001 |
k | 0.0343 | 0.1004 | 0.7372 |
b | 0.5085 | 0.0542 | <0.0001 |
g | 0.0343 | 0.5067 | 0.9469 |
Parameter | Estimate | Standard Error | p Value |
---|---|---|---|
a | 0.9984 | 0.0098 | <0.0001 |
k | 0.0319 | 0.0036 | <0.0001 |
n | 0.9688 | 0.0361 | <0.0001 |
b | −0.0012 | 0.0002 | <0.0001 |
Model No. | Model Name | Model Equation | Reason | Reference |
---|---|---|---|---|
1 | Henderson–Pabis | Initial condition | [40] | |
2 | Modified Henderson–Pabis | Initial condition Insignificant parameters | [32] | |
3 | Modified Page II | Simpler version with the same fit but fewer parameters is available | [25] | |
4 | Logarithmic (Asymptotic) | Initial condition Final condition | [41] | |
5 | Midilli | Initial condition Final condition Insignificant parameters | [36] | |
6 | Modified Midilli I | Final condition Insignificant parameters | [42] | |
7 | Modified Midilli II | Initial condition Final condition Insignificant parameters | [43] | |
8 | Two-term | Initial condition Insignificant parameters | [34] | |
9 | Modified two-term I | Insignificant parameters | [44] | |
10 | Modified two-term II | Insignificant parameters | [45] | |
11 | Diamante | Transformation Heteroscedastic data | [29] | |
12 | Thompson | Transformation Heteroscedastic data | [30] | |
13 | Wang–Singh | Final condition | [46] | |
14 | Aghbashlo | Final condition | [47] |
Model No. | Model Name | Model Equation | Comment | Reference |
---|---|---|---|---|
1 | Lewis (Newton) | Simplest model, but not flexible enough to describe many drying data | [39] | |
2 | Page * | Simple, and can be used to describe drying data of many foods. Strong correlation between the parameters. | [20] | |
3 | Modified Page I * | Same fit with the Page model; however, it has fewer errors on the rate parameter (K), and also correlation between the parameters are low. | [21] | |
4 | Weibull * | Same fit with the Page model, low parameter correlation (same as Modified Page I). | [49] | |
5 | Weibull I * | Same fit with the Page model, mild parameter correlation. Interpretable time parameter (δ) that can be roughly estimated by visual inspection of the data. | [22] | |
6 | Modified two-term III | Mild to strong parameter correlation | [50] |
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Buzrul, S. Reassessment of Thin-Layer Drying Models for Foods: A Critical Short Communication. Processes 2022, 10, 118. https://doi.org/10.3390/pr10010118
Buzrul S. Reassessment of Thin-Layer Drying Models for Foods: A Critical Short Communication. Processes. 2022; 10(1):118. https://doi.org/10.3390/pr10010118
Chicago/Turabian StyleBuzrul, Sencer. 2022. "Reassessment of Thin-Layer Drying Models for Foods: A Critical Short Communication" Processes 10, no. 1: 118. https://doi.org/10.3390/pr10010118