Modeling of continuous thermal processing of a non-Newtonian liquid food under diffusive laminar flow in a tubular system

Author(s)

Kechichian, Viviane ^[1] ; Crivellari, Gabriel P. ^[1] ; Gut, Jorge A. W. ^{[2, 1]} ; Tadini, Carmen C. ^{[2, 1]}

Affiliation

^[1] Univ Sao Paulo, Dept Chem Engn, Escola Politecn, BR-05424970 Sao Paulo - Brazil

^[2] Univ Sao Paulo, NAPAN Food & Nutr Res Ctr, BR-05424970 Sao Paulo - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER; v. 55, n. 21-22, p. 5783-5792, OCT 2012.
• Web of Science Citations: 12

Abstract

The classic conservative approach for thermal process design can lead to over-processing, especially for laminar flow, when a significant distribution of temperature and of residence time occurs. In order to optimize quality retention, a more comprehensive model is required. A model comprising differential equations for mass and heat transfer is proposed for the simulation of the continuous thermal processing of a non-Newtonian food in a tubular system. The model takes into account the contribution from heating and cooling sections, the heat exchange with the ambient air and effective diffusion associated with non-ideal laminar flow. The study case of soursop juice processing was used to test the model. Various simulations were performed to evaluate the effect of the model assumptions. An expressive difference in the predicted lethality was observed between the classic approach and the proposed model. The main advantage of the model is its flexibility to represent different aspects with a small computational time, making it suitable for process evaluation and design. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/07934-3 - Study and modeling of thermal processing in double-pipe heat exchanger
• Grantee: Jorge Andrey Wilhelms Gut
• Support Opportunities: Regular Research Grants
• FAPESP's process: 08/06638-9 - Modeling and Simulation of a Continuous Tubular Pasteurizer
• Grantee: Gabriel Pereira Crivellari
• Support Opportunities: Scholarships in Brazil - Scientific Initiation