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Drying characteristics of mint leaves (Mentha arvensis) dried in a solid desiccant dehumidifier system

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Abstract

In this present study, solid desiccant-based pressure-swing adsorption (PSA) dehumidifier was developed and the process parameters were optimized to deliver the air continuously at 0.1% relative humidity. Mint (Mentha arvensis) leaves are tested to study the drying characteristics at varied flow rates of dehumidified air in the drying chamber. The initial moisture content of 5.059 g water/g dry matter have been reduced to a safe storage level in 360 min at 0.160 m3/min volume low rate. The effective moisture diffusivity of the mint leaves was found in the range of 2.07534 × 10−11m2/s to 3.45817 × 10−11m2/s. The percentage of retention of ascorbic acid in dried mint leaves is increased by an increase in the volume flow rate of dry air and a maximum of 70.11% is achieved by 0.160 m3/min. The colour measurement and chlorophyll content of the dried samples indicated that the desiccant dehumidified air dryers are suitable for heat sensitive green leafy vegetables.

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Abbreviations

Adj SS:

Adjusted sum of squares

m3/min:

Cubic metre per minute

°C:

Degree celsius

Deff :

Effective moisture diffusivity (m2/s)

DBT:

Dry bulb temperature

DR:

Drying rate (g water/g dry matter.min)

g:

Gram

hp:

Horse power

kg:

Kilogram

lpm:

Litre per minute

m/s:

Meter per second

m:

Metre

md :

Moisture content on dry basis (g water/g dry matter)

mt :

Moisture content at any time ‘t’

MR:

Moisture ratio

ppmv:

Parts per million volume basis

%:

Percent

R1:

Replication 1

R2:

Replication 2

R3:

Replication 3

R2 :

Regression

rh:

Relative humidity

s:

Second

t:

Drying time (sec)

wo :

Initial weight of the product (g)

wd :

Weight of the dry matter (g)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Coimbatore Institute of Engineering and Technology, Coimbatore, Tamilnadu, India

    V. Suresh Kannan

  2. Department of Mechanical Engineering, School of Studies in Engineering and Technology, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur, Chhattisgarh, India

    T. V. Arjunan

  3. Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu, India

    S. Vijayan

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  1. V. Suresh Kannan
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  2. T. V. Arjunan
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  3. S. Vijayan
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Correspondence to V. Suresh Kannan.

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Kannan, V.S., Arjunan, T.V. & Vijayan, S. Drying characteristics of mint leaves (Mentha arvensis) dried in a solid desiccant dehumidifier system. J Food Sci Technol 58, 777–786 (2021). https://doi.org/10.1007/s13197-020-04595-z

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