ANALYSES OF THE SIMULTANEOUS ABSORPTION OF TWO GASES WITH EXOTHERMIC REACTION

This study examines the effects of various parameters on the nonisothermal gas absorption. A pair of coupled irreversible and reversible (1, ) order exothermic chemical reactions are considered in this research. The film model is employed to describe the heat and mass transfer. The interfacial temperature rise and the enhancement factors are determined nonlinearly by Muller's method. The nonisothermal effects of gas absorption are presented as functions of the dimensionless group M^½ at given thermophysical properties and kinetic parameters. The analyses provide useful information for nonisothermal reactor design and modeling.     

Through‐wall welding residual stress profiles for dissimilar metal nozzle butt welds in pressurized water reactors

This paper provides approximate expressions for through‐wall welding residual stresses in dissimilar metal nozzle butt welds of pressurized water reactors. An idealized shape of nozzle is proposed, based on which systematic elastic–plastic thermo‐mechanical finite element analyses are conducted by varying the thickness and radius of the nozzle and the length of the safe‐end. Based on the results, a through‐wall welding residual stress profile for dissimilar metal nozzle butt welds is proposed by modifying the existing welding residual stress profile for austenitic pipe butt welds in the R6 procedure.     

Numerical simulation for thermal response test performance in closed-loop vertical ground heat exchanger

In this study, a series of numerical analyses was performed in order to evaluate the performance of full-scale closed-loop vertical ground heat exchangers constructed in Wonju, South Korea. The circulating HDPE pipe, borehole and surrounding ground formation were modeled using FLUENT, a finite-volume method (FVM) program, for analyzing the heat transfer process of the ground heat exchanger system. Two user-defined functions (UDFs) accounting for the difference in the temperature of the circulating inflow an...