The Effect of Buoyancy Force in Computational Fluid Dynamics Simulation of a Two-Dimensional Continuous Ohmic Heating Process | Science Publications

American Journal of Applied Sciences

Elzubier A. Salih¹  S. Y. Sergie¹  N. L. Chin¹  O. M. Ibrahim¹  Thomas S.Y. Choong¹ 

关键词: CFD numerical modeling;    2D ohmic heating;    Natural convection;    guava juice;   

DOI  :  10.3844/ajassp.2009.1902.1908

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

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

【 授权许可】

Unknown