Numerical Simulation In The Course Of Heat Transfer And Its Stucture Optimization For Rib-Tube

The dissertation combines theoretical analysis and numerical simulation with experience, studied the rib-tube which manufactured by means of cutting-extrusing composite technics.Firstly, The development and general situation of numerical heat transfer and FEM are summarized , the mathematical and FEM models of rib-tube with large aspect ratio are given , and the relative problems are disposed. These methods are following:(1) In order to build FEM model conveniently and enhance calculating speed,interceped a finite length and built a 2D-symmetry model.(2) In order to apply loads conveniently, kept the entrance of cold fluid .(3) In order to obtain numerical results in steady situation, lengthened export and import ends.Secondly, The temperature distribution in rib-tube heat exchanger in the course of heat transfer is programed and simulated using APDL Language of FEM software ANSYS, and the average convection coefficient of both sides is obtained .The rib-tubes with different structure are also simulated and optimized on the base of the calculated results , The relationship between structure and the average convection coefficient of both sides is summrized. The rib-tube structure is optimized using APDL.Finally, combines numerical simulation with experimental research,andresults of numerical simulation are found to be close to the experimental data. Therefor, Numerical Simulation Technology is an efficient and ideal method to research the heat transfer, to design and optimize rib-tube heat transfer.