Abstract:
The objectives of this thesis are to simulate heat transfer of canned food that natural convection andconduction heat transfer occured. Moreover, relation between rheology property and the coldestposition was determined by Computation Fluid Dynamics (CFD) package, ADINA (finite elementbased method). Lastly, MATLAB was used for developing CFD program in 2 dimensional naturalconvection by using finite difference method. Water and sodium carboxy-methyl cellulose (CMC)solution were selected as material to test in cylindrical cans. The can size used in this study were307 x 409, which fully filled and sterilized in retort at 121 0C. Transient flow patterns andtemperature profiles for liquid (water and CMC solution) within the can could be predicted.Concentrations of CMC solution for this study are 0.5 , 1.0 , 2.0 , 3.0 , 4.0 , 6.0 percent w/w.Processing time of water and CMC solution are 540 810 840 1230 1860 2160 and 3000 secondsrespectively. The coldest position of water and CMC solution predicted by the ADINA. Water andCMC solution at concentration 0.5 , 1.0 , 2.0 , 3.0 and 4.0 percent were donut shape located 10-20percent away from the can bottom. At concentration 6.0 percent, the coldest position was located at17 percent of the container height. The relation between coldest position in dimensionless parameterand Rayleigh number were r/R = 1-0.5513(Ra???10?????5)????? -0.2438 and z/Z = 0.127(Ra???10?????5) ????? -0.1299 R?????2 were 0.976 and 0.892, Rayleigh number was in range of 10?????310?????6. From these relations, thecoldest position of liquid food at different concentration can be predicted. The simulation resultcome out from the MATLAB program purposed by this thesis was quite satisfied when comparewith ADINA , s result.