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Dynamic Modeling of Thermal Performance of Multichannel Plate Heat Exchangers

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  036188,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14154) @2003
Authors:   Soojin Jun, V. M. Puri
Keywords:   Fouling, model, plate heat exchanger, milk, 2D model, transient model

Fouling is a typical and severe problem during thermal treatment using plate heat exchangers (PHEs) in the dairy industry. A 2D dynamic model was developed to interpret the transient thermal performance of PHEs in relation to localized milk fouling phenomena. The conventional 1D model, used as basis of most fouling models, was compared for validation of 2D model in multichannel PHE. To measure the local temperatures of the fluid, T-type thermocouple wires were placed at 15 different locations of a plate, which were inserted between the channels of interest. The 1D model based on unidirectional, constant flow velocity showed limited predictive accuracy for the experimental data dependent upon the flow characteristics, i.e. an average percentage deviation of 3.9% for fully developed flow scheme and 36.1% for potential eddy flow scheme. On the other hand, the 2D model that takes into account the hydrodynamics of flow stream was capable of predicting temperature distribution of fluid flow with an average percentage deviation of 6.2%, irrespective of the flow patterns. The validated 2D model is expected to enable the identification of potential regions of milk deposits.

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