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Transport coefficients for low and high-rate mass transfer along a biological horizontal cylinder

机译:沿生物水平圆柱体进行低速和高速率传质的传输系数

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Knowledge of heat and mass transfer coefficients is essential for drying simulation studies or design of food and grain thermal processes, including drying. This work presents the full development of a segregated finite element method to solve convection-diffusion problems. The developed scheme allows solving the incompressible, steady-state Navier-Stokes equations and convective-diffusive problems with temperature and moisture dependent properties. The problem of simultaneous energy, momentum and species transfer along an infinite, horizontal cylinder under drying conditions in forced convection is presented, considering conditions normally found in biological material thermal treatment or drying. Numerical results for Nusselt and Sherwood numbers were compared against available empirical expressions; the results agreed within the associated experimental errors. For high rate mass transport processes, the proposed methodology allows to simulate drying conditions involving wall convective mass flux by a simple inclusion of the appropriated boundary conditions.
机译:对传热系数和传质系数的了解对于干燥模拟研究或食品和谷物热过程(包括干燥)的设计至关重要。这项工作提出了解决对流扩散问题的隔离有限元方法的全面发展。所开发的方案允许求解不可压缩的稳态Navier-Stokes方程以及与温度和湿度有关的性质的对流扩散问题。考虑到通常在生物材料热处理或干燥条件下发现的条件,在强制对流的干燥条件下,能量,动量和物质沿无限水平圆柱体同时传递的问题出现了。将Nusselt和Sherwood数的数值结果与可用的经验表达式进行了比较。结果在相关的实验误差范围内是一致的。对于高速率的传质过程,所提出的方法允许通过简单地包括适当的边界条件来模拟涉及壁对流传质通量的干燥条件。

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