Validation of hydrodynamic and microbial inactivation models for UV-C treatment of milk in a swirl-tube 'SurePure Turbulator™'
Validation of hydrodynamic and microbial inactivation models for UV-C treatment of milk in a swirl-tube 'SurePure Turbulator™'
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DOI：
10.1016/j.jfoodeng.2015.04.009
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发表时间：
2015-10-01
影响因子：
5.5
通讯作者：
Koutchma, Tatiana
中科院分区：
文献类型：
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作者：
Alberini, Federico;Simmons, Mark J. H.;Koutchma, Tatiana
正电子发射粒子跟踪（PEPT）流动可视化技术已被应用于确定一个全尺寸的SurePure Turbulator（TM）的透明模型的流体动力学性能，用于使用UV-C辐射的混浊的乳品液体的微生物处理。使用两种分别具有相同粘度的牛奶和奶油模型流体，研究了流速对紫外光源表面流体更新的影响。表面更新的量被建模为时间密度函数接近UV-C源的表面，并纳入现有的一阶微生物灭活模型和威布尔分布模型。拟合选定的牛奶病原体使用Turbulator（TM）灭活获得的实验数据已经证明了威布尔模型的优越性。这些模型使得能够更精确地估计用于灭活乳传播的病原生物体的UV-C能量需求，因为表面更新的量提供了显著的性能增强。(C)2015爱思唯尔有限公司版权所有。
The Positron Emission Particle Tracking (PEPT) flow visualisation technique has been applied to determine the hydrodynamic performance of a full-scale transparent model of a SurePure Turbulator (TM) used for the microbial treatment of turbid dairy fluids using UV-C radiation. The effect of flow rate upon the refreshment of fluid at the surface of the UV source has been investigated using two model fluids each possessing the same viscosities as milk and cream respectively. The amount of surface refreshment is modelled as a time density function close the surface of UV-C source and incorporated into an existing first order microbial inactivation model and a Weibull distribution model. Fitting to experimental data obtained for the inactivation of selected milk pathogens using the Turbulator (TM) have demonstrated the superiority of the Weibull model. These models enable a more precise estimation of UV-C energy requirement for the inactivation of the milk borne pathogenic organisms to be made since the amount of surface refreshment affords a significant performance enhancement. (C) 2015 Elsevier Ltd. All rights reserved.