Comparison of Analytical Models for Heat Flux Measurement Using Slug Calorimeter: Integration of Finite Element Analysis and Optimization Technique

Abstract This study focuses on comparing the accuracy of existing analytical models for heat flux measurement using a copper slug calorimeter in high-temperature environments. Two analytical models, the no loss model, with simpler calculations by ignoring heat loss, and the slug loss model, which incorporates heat loss for greater accuracy, are evaluated. A novel measurement approach, combining finite element analysis (FEA), optimization techniques, and experimental data, was developed to provide a robust framework for this comparison. The new method was tested by comparing its results with those obtained from the two existing models. The heat flux values were 237.181 W/cm2 for the no loss model, 252.95 W/cm2 for the slug loss model, and 254.97 W/cm2 from the proposed approach (numerical estimation method). The results demonstrated that the proposed approach aligns more closely with the slug loss model, suggesting its suitability for accurate heat flux measurement in high-temperature environments and its utility as a tool for comparing analytical methods. These findings provide valuable insights for choosing appropriate models in various heat flux measurement applications.