Thermal analysis of marine structural steel EH36 subject to non-spreading cryogenic spills. Part II: finite element analysis

• Published in: Ships and offshore structures Vol. 17; no. 10; pp. 2176 - 2185
• Main Authors: Mokhtari, Mojtaba, Nam, Woongshik, Amdahl, Jørgen
• Format: Journal Article
• Language: English
• Published: Cambridge Taylor & Francis 03.10.2022; Taylor & Francis Ltd
• Subjects: Air temperature; Analysis; Boiling; Boiling points; Convection; Cryogenic spill; Cryogenic temperature; Finite element method; Heat flux; Heat transfer; High strength steels; Limit states; Liquid nitrogen; marine steel; numerical; offshore; Offshore structures; Specific heat; Steel; Steel plates; Structural steels; Temperature differences; Temperature gradients; Thermal analysis; Thermal conductivity
• ISSN: 1744-5302; 1754-212X
• DOI: 10.1080/17445302.2021.1979920

In Part I of this paper, six liquid nitrogen (LN 2 ) pool boiling tests were carried out to locally cool down six different EH36 steel plates to cryogenic temperatures. Leindenfrost and Critical Heat Flux (CHF) points of LN 2 boiling curve were estimated. These estimations together with the recorded temperature histories are used in this part for the development of a heat flux curve for EH36 steel-LN 2 pool boiling through Finite Element Thermal Analysis (FETA) of the problem investigated experimentally in Part I. Thermal conductivity and heat capacity of EH36 are defined by two unprecedented temperature functions based upon experimental studies in cryogenic temperatures. A user subroutine written in FORTRAN defines the air convection coefficient as a function of surface-air temperature difference, which changes with time and location. Results of this study contribute to the Accidental Limit State (ALS) design of marine and offshore structures for liquified gas spill scenarios.