Heat and Mass Transfer

, Volume 51, Issue 8, pp 1167–1176 | Cite as

Experimental investigation of convective drying kinetics of kiwi under different conditions

  • Selçuk DarıcıEmail author
  • Soner Şen


The effects of air temperature, velocity and humidity on drying characteristics of kiwi are experimentally investigated for the temperatures in the range of 50–80 °C, of the velocities 0.5–2.0 m/s, of the relative humidity values of 5–20 % and for two slice thicknesses. It is observed that there is a very close agreement between the model of Midilli et al. (Dry Technol 20:1503–1513, 2002) and the present study with coefficients of correlation R2 of 0.9949–0.9996.


Effective Diffusion Coefficient Moisture Diffusion Moisture Ratio Fall Rate Period Page Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

a, b, c

Constants of model equations


Effective diffusion coefficient (m2/s)


Arrhenius factor (m2/s)


Drying rate (g w /g db min)


Activation energy (kJ/mol)


Drying rate constant in model equations (1/min)




Half thickness of slice (m)


Mass of dry matter (g)


Initial moisture content (g w /g dm )


Moisture content at time t (g w /g dm )


Mass of wet matter (g)


Moisture content in dry base (g w /g dm )


Moisture content in wet base (%)


Moisture content at time t + ∆t (g w /g dm )


Moisture ratio


Exponents in model equations


Universal gas constant (kJ/mol K)


Correlation coefficient


Root mean square error


Relative humidity (%)


Time (min)


Temperature (°C)


Absolute temperature (K)


Air velocity (m/s)


Time difference (min)



The authors acknowledge the financial support provided by Scientific Research Projects Coordinatorship of Selçuk University Contract No: 09101056.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Mechanical Engineering Department, Faculty of EngineeringSelçuk UniversityKonyaTurkey
  2. 2.Mechanical Education Department, Faculty of Technical EducationSelçuk UniversityKonyaTurkey

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