Graduate Thesis Or Dissertation
 

Finite element simulation of heat transfer in Pacific whiting surimi paste during ohmic and conventional heating

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jm214s067

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  • The viability of using ohmic "resistance" heating as a process alternative to inactivating the heat-stable softening enzyme in Pacific whiting surimi was investigated. A fast heating rate through the enzyme-active temperature range would reduce the damage to the gelling network in surimi-based products. Simulating the ohmic heating process in surimi would help in designing industrial size equipment. Such simulation requires knowledge of thermal and electrical properties. Thermal conductivity, specific heat and density of Pacific whiting surimi with 74, 78, 80 and 84% moisture content were measured and modeled over the cooking temperature range. Thermal conductivity and specific heat were measured using a linear heat source probe and differential scanning calorimetry (DSC) respectively. Both thermal conductivity and specific heat were found to increase with increasing moisture content and temperature. Surimi density was found to decrease with increasing moisture content and temperature. Empirical models for each property, as a function of temperature and moisture content, were fitted based on the experimental data. Those correlations were used to simulate the heat transfer in surimi using water bath "conventional" and ohmic "resistance" heating with the aid of commercial finite element partial differential equation software (PDEase). The heat transfer simulation was used to evaluate the heating rate, heat distribution in surimi and the parameters affecting the heating process. Ohmic heating was found to have higher heating rate with higher moisture content in surimi and higher voltage gradient across the sample. The electrode design for the ohmic heater is critical and has a significant effect on the heating rate. Ohmic heating was also compared to the conventional case (heating by convection through the boundaries) and was found to have a higher rate. Ohmic heated surimi paste was found to have better gel quality than that heated conventionally.
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