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Thermal Behaviour Prediction of Particulates Under Ambient and Cryogenic Conditions

Balachandran, Pratik (2007) Thermal Behaviour Prediction of Particulates Under Ambient and Cryogenic Conditions. [Student Project Report]

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Abstract

This Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page.

Item Type: Student Project Report
Additional Information: Practically every solid food material undergoes size reduction at some point in the processing cycle. During the size reduction of solid food materials intensive energy degradation into heat takes place during fracture before resulting into fragments. Since fracture is a rate process with random fluctuations of stresses, the thermal effects cannot be calculated from continuum mechanics. A simple novel approach to quantitatively characterize thermal effects of solid food particulates in terms of temperature change as a function of particle rise under ambient and cryogenic conditions using the spice turmeric (Curcuma Longa L.) as a model material is presented. The log-normal function was used to characterize the thermal effects. Cylindrical specimens of turmeric were impacted diametrically and the resulting particle size distributions and cumulative volume fraction were measured by computerized inspection particle size analyzer. The various model parameters estimated under the said conditions were surface-volume ratio, energy density and the combined strength parameter. The temperature change T ( oC) was calculated in terms of log-normal parameters and material properties as (1/Cv) dW/dV, where Cv is the specific heat (kJ/m3oC) and dW/dV is the local energy density (kJ/m3) and this calculated rise in temperature was plotted as a function of size of particles and was experimentally validated using thermal dye. This study showed that it is possible to predict the maximum temperature rise that could occur for a particle of a given diameter fractured under grinding and similar unit operations in a field where it is not possible to apply continuum mechanics and deterministic thermodynamics.
Uncontrolled Keywords: Thermal effects Particle size Cryogenics Fracture Particulates Thermochromism
Subjects: 600 Technology > 08 Food technology > 07 Food Engineering
600 Technology > 08 Food technology > 30 Spices/Condiments > 07 Turmeric
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 31 Jul 2007 04:12
Last Modified: 28 Dec 2011 09:29
URI: http://ir.cftri.com/id/eprint/1376

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