Comparison and Validation of Dynamic Characteristic Analytical Method for Tubular Heat Exchanger

In this study,the natural frequencies of Normal Residual Heat Removal Heat Exchangers are evaluated based on the beam and shell-beam finite element models.The corresponding results are compared and some discrepancies are observed.These discrepancies are analyzed in terms of the analysis of a cylindrical shell and the unreasonable treatment of boundary conditions is accordingly pointed out.The experimental data of the natural frequencies of heat exchangers used for Qishan Phase I Nuclear Power Plant are compared with the computational results from the shell-beam models for corresponding heat exchangers of C-2 program.The experimental and numerical results agree quite well,which implies that the shell-beam finite element simplification is applicable to the heat exchangers.The results indicate that the procedures introduced in this article apply to the dynamic analysis of other similar heat exchangers.