Promotion of uniform radial temperature distribution using buoyancy effect in inclination pipes,Journal of Food Process Engineering

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Promotion of uniform radial temperature distribution using buoyancy effect in inclination pipes
Journal of Food Process Engineering ( IF 2.7 ) Pub Date : 2020-05-29 , DOI: 10.1111/jfpe.13440
Suresh Krishnan ₁ , Ajay S. Karnavar ₁ , Kadzungura Luckmore ₂

Affiliation

A model case was formulated to examine the buoyancy effect on radial temperature distribution in the heating section of thermal sterilization for high water content juices. Computational Fluid Dynamics (CFD) was employed in the short isothermal pipe to study the effect of Reynolds numbers (50, 300, and 2000), Rayleigh numbers (1 × 10⁶ and 4.29 × 10⁶), and pipe inclined angles (0 ≤ θ ≤ 60°). The simulation results were validated with the experimental and numerical data obtained from literature. When the buoyancy effect was dominant, the velocity and temperature were found to be unevenly distributed in the horizontal pipe. Besides, the coldest spot fluid reached maximum velocity, which does not allow adequate thermal sterilization. However, the significant effect of the inclined pipe angle was observed upon the enhancement of radial temperature uniformity. Moreover, the local Nusselt number increased with escalating pipe angles when compared with the horizontal pipe.

中文翻译：

利用倾斜管中的浮力效应促进径向温度均匀分布

制定了一个模型案例，以研究高含水量果汁在热灭菌加热部分中浮力对径向温度分布的影响。Ç omputational ˚F LUID d ynamics（CFD）是在短等温管用于研究雷诺数（50，300，和2000年），瑞利数（1×10的效果⁶和4.29×10 ⁶）和管道倾斜角（ 0≤θ ≤60°）。仿真结果得到了来自文献的实验和数值数据的验证。当浮力作用占优势时，发现水平管中的速度和温度分布不均匀。此外，最冷的点液达到最大速度，这不能进行足够的热灭菌。但是，在提高径向温度均匀性时，观察到了倾斜管角度的显着影响。而且，与水平管相比，局部努塞尔数随着管角度的增加而增加。

更新日期：2020-05-29

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