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Fluid Mechanics and Fluid Power – Contemporary Research pp 205–213Cite as

Estimation of Equilibrium Moisture Content and Drying Time of Potato Through Hot Air Drying

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Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

The micro-organisms and bacteria lead the decomposition/decay of moist potato. These failures are almost negligible when the moisture content of potato is reduced below 10 %. Convective drying effectively prevents those defects/failures in the food stuffs. An experimental facility is developed for convective drying of moist object. Time dependent mass of the rectangular potato is measured during drying and using this data the transient moisture content is estimated. Initial moisture content is estimated by a thermostatically controlled hot air oven. The drying air velocity is maintained 2, 4 and 6 m/s and it was experimented at different air temperatures of 40, 50, 60 and 70 °C. The equilibrium moisture content and equilibrium drying time (Fourier number) are found and tabulated. A correlation is developed for equilibrium moisture content and Fourier number based on the drying air velocity and temperature. Density of potato is estimated from the experimental data and a good agreement is noticed when compared with the data from literature.

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Abbreviations

a, b, c, d:

Constants

A1, A2, A3 :

Constants

B:

Breadth of potato, cm

D:

Diffusion coefficient, m2/s

H:

Width of potato, cm

db:

Dry basis

L:

Length of the moist object, cm

Ld :

Hydraulic diameter, m

m:

Mass of the object, g

M:

Moisture content, kg/kg of db

t:

Time, s

T:

Temperature, °C

v:

Velocity, m/s

Φ:

Non dimensional moisture content

ρ:

Density of object, g/cm3

τ:

Mass transfer Fourier number

dry:

Moisture content at t minutes

eq:

Equilibrium

final:

Moisture content of final bone dry material

0:

Initial condition

References

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  2. Wang, N., Brennan, J.G.: Changes in structure, density and porosity of potato during dehydration. J. Food Eng. 24, 61–76 (1993)

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  3. Simal, S., Rossello, C., Berna, A., Mulet, A.: Drying of shrinking cylinder-shaped bodies. J. Food Eng. 37, 423–435 (1998)

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  4. Hussain, M.M., Dincer, I.: Two-dimensional heat and moisture transfer analysis of a cylindrical moist object subjected to drying: a finite-difference approach. Int. J. Heat Mass Transf. 46, 4033–4039 (2003)

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  5. Dutta, S.K., Nema, V.K., Bharadwaj, R.K.: Drying behavior of spherical grains. Int. J. Heat Mass Transf. 31(4), 855–861 (1988)

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  6. Chandramohan, V.P., Talukdar, P.: Three dimensional numerical modeling of simultaneous heat and moisture transfer in a moist object subjected to convective drying. Int. J. Heat Mass Transf. 53, 4638–4650 (2010)

    Article  MATH  Google Scholar 

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Warangal, Telangana, 506 004, India

    V. P. Chandramohan

  2. Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, 110 016, India

    Prabal Talukdar

Authors
  1. V. P. Chandramohan
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  2. Prabal Talukdar
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Corresponding author

Correspondence to V. P. Chandramohan .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Arun K. Saha

  2. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Debopam Das

  3. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Rajesh Srivastava

  4. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    P. K. Panigrahi

  5. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    K. Muralidhar

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Chandramohan, V.P., Prabal Talukdar (2017). Estimation of Equilibrium Moisture Content and Drying Time of Potato Through Hot Air Drying. In: Saha, A., Das, D., Srivastava, R., Panigrahi, P., Muralidhar, K. (eds) Fluid Mechanics and Fluid Power – Contemporary Research. Lecture Notes in Mechanical Engineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2743-4_21

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  • DOI: https://doi.org/10.1007/978-81-322-2743-4_21

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  • Publisher Name: Springer, New Delhi

  • Print ISBN: 978-81-322-2741-0

  • Online ISBN: 978-81-322-2743-4

  • eBook Packages: EngineeringEngineering (R0)

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