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Temperature dependent electrical conductivities of fruit purees during ohmic heating

Icier, Filiz and Ilicali, Coskan (2005) Temperature dependent electrical conductivities of fruit purees during ohmic heating. Food Research International, 38 (10). pp. 1135-1142. ISSN 0963-9969

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Ohmic heating takes its name from Ohm's law; the food material switched between electrodes has a role of resistance in the circuit. In this study, the apricot and peach purees were heated on a laboratory scale static ohmic heater by applying voltage gradients in the range of 20-70 V/cm. The voltage gradient was statistically significant on the ohmic heating rates for both purees (P < 0.05). The linear temperature dependent electrical conductivity relations were obtained. Bubbling was observed above 60°C especially at high voltage gradients. The ohmic heating system performance coefficients were in the range of 0.49-1.00. The unsteady-state heat conduction equation for negligible internal resistance was solved with an ohmic heating generation term by the finite difference technique. The predictions of the mathematical model using obtained electrical conductivity equations were found to be very accurate. © 2005 Elsevier Ltd. All rights reserved.

Item Type:Article
Keyword:Electrical conductivity; Fruit purees; Modelling; Ohmic heating
Subject:Electric conductivity
Subject:Fruit - Processing
Subject:Electric heating
Faculty or Institute:Faculty of Engineering
DOI Number:10.1016/j.foodres.2005.04.003
ID Code:18359
Deposited By: Azwana Abdul Rahman
Deposited On:29 Oct 2011 18:34
Last Modified:02 Oct 2015 09:06

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