Shrinkage of Food Materials During Drying: Current Status and Challenges

Area of Science:

• Food Science
• Material Science
• Chemical Engineering

Background:

• Drying causes complex physicochemical changes in fruits and vegetables.
• Shrinkage is a key phenomenon affecting dried food texture and taste.
• Factors influencing shrinkage include material properties and drying conditions.

Purpose of the Study:

• To critically review existing theoretical shrinkage models for fruits and vegetables.
• To present a framework for a theoretical shrinkage mechanism model.
• To discuss the impact of drying conditions and material characteristics on shrinkage.

Main Methods:

• Literature review of experimental, empirical, and theoretical shrinkage studies.
• Analysis of theoretical modeling approaches for heat and mass transfer during drying.
• Synthesis of formulation techniques and results from shrinkage models.

Main Results:

• Existing experimental and empirical studies lack realistic insights into shrinkage phenomena.
• Theoretical modeling offers better understanding of simultaneous heat and mass transfer during shrinkage.
• Limited research exists on theoretical modeling of fruit and vegetable shrinkage.

Conclusions:

• A physics-based theoretical model is needed for accurate prediction of fruit and vegetable shrinkage.
• Further research should focus on developing comprehensive theoretical models.
• Understanding shrinkage mechanisms is crucial for optimizing drying processes and product quality.