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Subject: Agricultural Physics and Meteorology × Author: Jasleen Kaur × Start date: 1998 × Type: Thesis ×
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    ThesisItemOpen Access
    Temperature Dependent Electrical Conductivity of Soymilk during Ohmic Heating
    (Punjab Agricultural University, Ludhiana, 2016) Jasleen Kaur; Paramjit Singh
    Ohmic heating, also known as „resistive heating‟ or „Joule heating‟ is a process when electrical current is passed through a conducting substance and due to its internal resistance heat is generated within that conducting substance. The present study aimed to design, built ohmic heating system and ohmic heating behavior was studied in soymilk. Study was conducted on five different voltage gradients (14, 12, 10, 8 and 6V/cm) and concentrations (100, 90, 80, 70, 60%) in the temperature range 30 to 70 ˚C. Ohmic heating behavior of any sample is affected by different parameters like electrical conductivity, viscosity, pH, soluble solids etc. Results indicated that there was a significant effect of voltage gradients and concentrations on the heating rate and heating rate showed a linear behavior. Also, plots between temperature and electrical conductivity depicted a linear trend. Other parameters- viscosity, pH and total soluble solids (TSS) were measured before and after ohmic heating. Statistical analysis was done on all of these parameters and it was concluded that ohmic heating had no effect on viscosity and TSS of sample, but there was a significant effect of this treatment on pH at 14 and 6V/cm and non-significant effect on rest of the voltage gradients. System performance coefficient (SPC) was calculated for all voltage gradients and all concentrations. It was observed that SPC was higher for 14V/cm for all concentrations and its value decreased as we decrease the voltage gradient.