Thermal stress analysis of a Water-Molten Salt Heat Exchanger: Computational Fluid Dynamics with Fluid-Structure Interaction
Translated title
Thermal stress analysis of a Water-Molten Salt Heat Exchanger
Author
Term
4. semester
Education
Publication year
2023
Submitted on
2023-05-31
Pages
71
Abstract
A CFD analysis has been performed for the simulation of a molten sodium hydroxide heat exchanger. Two differ- ent designs were investigated: Double pipe and U-tube heat exchangers for 3 different pressures (1,2 and 5 [bar]) of the working fluid, which was wa- ter. Then the FEM analysis of Ther- mal stress was performed. The sim- ulations ran with the assumption that stress induced by constrained expan- sion is covered by the heat exchanger design apart from one for the atmo- spheric pressure for the U-tube heat exchanger. In this simulation, it was assumed that the baffle is pressed on the heat exchanger tubes and any ex- pansion of the tubes is constrained by the baffle. Additionally, the Factor of Safety for each simulation was com- puted in order to find out, if the stress exceeds the tensile yield strength and thus the elastic range. The compari- son between each of the scenarios re- vealed that considering the same prop- erties and boundary conditions Dou- ble pipe HX produces higher amounts of thermal stress, but still keeps the levels of Factor of Safety at an accept- able level. Moreover, it has been found that it is necessary to apply safety mea- sures to the expansion of the pipes as the Factor of Safety for a case with con- strained expansion was less than 1 and thus elastic range was exceeded and the pipes are irreversibly damaged
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