Heat transfer to a canned corn starch dispersion under intermittent agitation
2002
Tattiyakul, J. | Rao, M.A. | Datta, A.K.
A thermorheological model for the heating a 3.5% corn starch dispersion (STD) was used together with a finite element based simulation software (FIDAP) to solve the governing mass, momentum and energy transport equations for heating the STD at 121°C in a 303x406 axially rotating can. Heat transfer from the hot wall to the inner canned STD improved considerably in intermittent rotation because the boundary layer region was not covered with a thick layer of gelatinized starch. In comparison to the experimental data obtained in a Steritort, the simulated time¡temperature profile was conservative and was in reasonable agreement. Further, simulation results showed that increase in the retort temperature results in a higher relative volume average temperature. In contrast, increase in the reel rotational speed in the 5-12 rpm range brought about a reduction in the volume average temperature.
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