Numerical Solutions Using Non-uniform Grids to Laminar Flow and Heat Transfer between Parallel Plate with Obstruction

• Main Authors: Min-Yi Lin, 林旻毅
• Other Authors: 雷顯宇
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/12889777918412825049

碩士 === 國立臺灣海洋大學 === 機械與輪機工程學系 === 93 === The developments in micro and naro technology have been vastly applied in conventional and high-tech industry in recent years，which also make the fluid flow and heat transfer analysis play more important role in order to improve the heat transfer and reduce rate of mal-function of products。Due to the advance in high performance CPU processing in computer，the Computational Fluid Dynamics (CFD) in fluid flow and heat transfer simulation operated in PC becomes possible in solving complicated flow problem。 The objective of this current study is to analyze the forced convection in the entrance region in a parallel plate。A non-uniform grid is set up in order to enhance its solutions。A self-written FORTRAN program using Patankar's SIMPLER Algorithm is developed to verify its advantaged over uniform grid set up。 The flow field in the entrance region is analyzed using the program and compared with those analytical solution or empirical relations。It is then employed to study the thermally entrance and combined thermally entrance problems with different Reynolds NO. and Prandtl NO. are compared with those of analytical or numerical solution available in order to verify the code's accuracy。All the bench mark tests are run with uniform grid，then the code is applied to the forced convection problems using non-uniform grid。Finally，flows with obstructions are analyzed。It is found that the number of grids and CPU run time can be dramatically reduced in both the flow and thermal analysis with non-uniform grid's set up。 The code can be expanded to study thermal entrance or combined hydrodynamic and thermally entrance problems in three dimensional flows with multiple obstructions or turbulent flows，which are frequently encountered in practical engineering practices。