Article ID Journal Published Year Pages File Type
223376 Journal of Food Engineering 2013 9 Pages PDF
Abstract

This study was conducted to evaluate the convective heat transfer coefficient between Newtonian and non-Newtonian fluids and food particles inside of a glass vessel and to assess the effect of controlled variables: convection phenomena, heating temperature, immersion fluid, and different food particles. The coefficient was evaluated from the sample temperature as a function of the heating time by two approaches: a lumped parameter method and an analytical methodology. High values corresponded to heating in Newtonian fluids (70–181, 57–248 W/m2 K), and lower corresponded in non Newtonian fluids (31–169, 28–167 W/m2 K). Similarly, major heat transfer coefficient corresponded to the heating of mushrooms (32–110, 28–132 W/m2 K), followed by tomatoes (30–181, 35–183 W/m2 K) and potatoes (31–148, 34–248 W/m2 K), respectively. Fluid properties were more important than the thermal properties of the particles. This coefficient was higher at 85 °C in both types of fluids. Both methods generated satisfactory values, but the analytical approach showed more accuracy.

► Convective heat transfer evaluated for food model systems scarcely reported. ► Three solid foods as particle shapes: potato cubes, tomato spheres and mushrooms. ► Newtonian and non-Newtonian liquids: water, salt and CMC solutions and tomato puree. ► Two methods for “h” evaluation: without (LP) and with (AA) internal resistance. ► Practical and good “h” values for potential systems of industrial importance.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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