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首页> 外文期刊>American journal of applied sciences >The Effect of Buoyancy Force in Computational Fluid Dynamics Simulation of a Two-Dimensional Continuous Ohmic Heating Process | Science Publications
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The Effect of Buoyancy Force in Computational Fluid Dynamics Simulation of a Two-Dimensional Continuous Ohmic Heating Process | Science Publications

机译：浮力在二维连续欧姆加热过程计算流体动力学模拟中的作用科学出版物

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> Problem statement: Earlier research on ohmic heating technique focused on viscous food and foods containing solid particles. In this study, use of ohmic heating on sterilization of guava juice is carried out. Computational fluid dynamics was used to model and simulate the system. Investigate the buoyancy effect on the CFD simulation of continuous ohmic heating systems of fluid foods. Approach: A two-dimensional model describing the flow, temperature and electric field distribution of non-Newtonian power law guava juice fluid in a cylindrical continuous ohmic heating cell was developed. The electrical conductivity, thermo physical and rheological properties of the fluid was temperature dependent. Numerical simulation was carried out using FLUENT 6.1 software package. A user defined functions available in FLUENT 6.1 was employed for the electric field equation. The heating cell used consisted of a cylindrical tube of diameter 0.05 m, height 0.50 m and having three collinear electrodes of 0.02 m width separated by a distance of 0.22 m. The sample was subjected to zero voltage at the top and bottom of electrodes while electrical potential of 90 volts (AC 50-60 Hz) was set at the middle electrode. The inlet velocity is 0.003 m sec-1 and the temperature is in the range of 30-90
机译： > 问题陈述：早期对欧姆加热技术的研究集中在粘性食品和含有固体颗粒的食品上。在这项研究中，使用欧姆加热对番石榴汁进行杀菌。计算流体动力学用于建模和仿真系统。研究流体食物连续欧姆加热系统对CFD模拟的浮力效应。 方法：建立了二维模型，描述了圆柱状连续欧姆加热单元中非牛顿幂律番石榴汁液的流动，温度和电场分布。流体的电导率，热物理和流变性质与温度有关。使用FLUENT 6.1软件包进行了数值模拟。电场方程采用了用户定义的FLUENT 6.1中提供的函数。所使用的加热单元由直径为0.05 m，高度为0.50 m的圆柱管组成，并具有三个宽度为0.02 m的共线电极，其间隔为0.22 m。样品在电极的顶部和底部经受零电压，而在中间电极处设置90伏特的电位（AC 50-60 Hz）。入口速度为0.003 m sec -1 ，温度范围为30-90

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