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Experimental investigation of convective drying kinetics of kiwi under different conditions

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Abstract

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.

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Abbreviations

a, b, c :

Constants of model equations

D eff :

Effective diffusion coefficient (m2/s)

D 0 :

Arrhenius factor (m2/s)

DR :

Drying rate (g w /g db min)

E a :

Activation energy (kJ/mol)

k :

Drying rate constant in model equations (1/min)

K :

Slope

L :

Half thickness of slice (m)

M d :

Mass of dry matter (g)

M o :

Initial moisture content (g w /g dm )

M t :

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

M w :

Mass of wet matter (g)

M db :

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

M wb :

Moisture content in wet base (%)

M t+∆t :

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

MR :

Moisture ratio

n :

Exponents in model equations

R :

Universal gas constant (kJ/mol K)

R 2 :

Correlation coefficient

RMSE :

Root mean square error

RH :

Relative humidity (%)

t :

Time (min)

T :

Temperature (°C)

T abs :

Absolute temperature (K)

V :

Air velocity (m/s)

Δt:

Time difference (min)

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Acknowledgement

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

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Authors and Affiliations

  1. Mechanical Engineering Department, Faculty of Engineering, Selçuk University, 42250, Konya, Turkey

    Selçuk Darıcı

  2. Mechanical Education Department, Faculty of Technical Education, Selçuk University, 42250, Konya, Turkey

    Soner Şen

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  1. Selçuk Darıcı
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  2. Soner Şen
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Correspondence to Selçuk Darıcı.

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Darıcı, S., Şen, S. Experimental investigation of convective drying kinetics of kiwi under different conditions. Heat Mass Transfer 51, 1167–1176 (2015). https://doi.org/10.1007/s00231-014-1487-x

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