Electro Hydrodynamic Drying Technology In Food Industry

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ELECTRO HYDRODYNAMIC DRYING
NEW TECHNOLOGY
Date: 7th November 2022
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• Drying is one of the most common process technologies for preserving heat-sensitive plant-
based foods such as fruits and vegetables.
• One such innovative drying technology is electro hydrodynamic (EHD) drying. EHD drying
has recently gained significant interest as an alternative to standard convective drying. It is
particularly suitable for drying heat-sensitive foods, such as fruits and vegetables.
• An advantage with respect to the drying process includes a shorter drying time when
compared to hot-air and solar dryers at low or ambient temperatures (Precoppe et al., 2015;
Bechoff et al., 2010; Pirnazari et al., 2014).
INTRODUCTION

• A further advantage is that the drying process is reported to have a lower energy
consumption, so lower carbon emissions (Esehaghbeygi et al., 2014; Taghian Dinani
et al., 2014a; Yang & Ding, 2016).
• Other reported advantages regarding product quality include better retention of nutritional
content, flavor, and color, as well as lower shrinkage and higher rehydration capacity (Bajgai
et al., 2006; Defraeye & Martynenko, 2018; Elmizadeh et al., 2017; Esehaghbeygi
et al., 2014; Ni et al., 2019; Pirnazari et al., 2014).

• Electro hydrodynamics
Use of air ions in a strong electric field to Increase heat and mass transfer.
• Electro hydrodynamic drying
Non thermal processing technology
• EHD drying
Uses the synergistic effect of high voltage and corona wind velocity
Schematic view design of EHD
ELECTRO HYDRODYNAMIC DRYING

1. Impingement of electric wind on food material
2. Generation impact
3. Turbulence of water (greater just below the emitter electrode)
4. Water Molecules acquire sufficient energy
5. Phase changing of water from liquid to vapor
6. Generation Of concentration gradient between the concentric layers
7. Diffusion of water from outer layers to inner layers
8. Drying of entire food material.
MECHANISM OF EHD DRYING

S.No Food Findings from EHD drying
1. Potato slabs Rapid drying rate
2. Rice No effect on germination
characteristics
3. Shrimp Less shrinkage
Better rehydration
Better color
Softer body
4. Banana slices Less shrinkage
Better rehydration
Better color
APPLICATIONS IN FOOD MATERIALS:

• Electrohydrodynamic drying is a novel technology with higher drying rates as compared to conventional
techniques.
• It is an energy efficient technique with reduced power consumption.
• It leads to increase quality retention and lesser quality deterioration of foods.
• The lower energy consumption leads to reduce cost of drying. However an economic analysis, which
has not been performed yet is essential in order to know detailed cost involved.
• Thus electrohydrdynamic drying proves to be an ideal drying technology with great potential of
applications in the food industry.
CONCLUSION

1. https://ift.onlinelibrary.wiley.com/doi/full/10.1111/1541-4337.12799
2. https://www.sciencedirect.com/science/article/abs/pii/S0260877420305355
3. https://www.sciencedirect.com/science/article/abs/pii/S0959652618319097
4. https://www.slideshare.net/anass1250/electrohydrodynamic-drying-of-food
5. https://arunmujumdar.com/wp-content/uploads/2022/05/ASM-Medal-Award-Minisymposium-
2020-2021-Presentation-by-Professor-Tadeusz-Kudra.pdf
REFERENCES:

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