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http://dx.doi.org/10.1016/j.net.2022.05.024

Improvement of the critical heat flux correlation in a thermal-hydraulic system code for a downward-flow narrow rectangular channel  

Wisudhaputra, Adnan (School of Mechanical Engineering, Pusan National University)
Yun, Byong Jo (School of Mechanical Engineering, Pusan National University)
Jeong, Jae Jun (School of Mechanical Engineering, Pusan National University)
Publication Information
Nuclear Engineering and Technology / v.54, no.10, 2022 , pp. 3962-3973 More about this Journal
Abstract
Several critical heat flux (CHF) correlations including the look-up table in the MARS code have been assessed for the prediction of CHF in a downward-flow narrow rectangular channel. For the assessment, we built an experiment database that covers pressures between 1.01 and 39.0 bar, gap sizes between 1.09 and 6.53 mm, mass fluxes up to 25,772 kg/m2s, and under one-sided and two-sided heating conditions. The results of the assessment showed that the Kaminaga correlation has the best overall prediction compared to others. However, because the correlation uses global variables, such as inlet and outlet subcooling and total heat transfer area, it is difficult to use in a system code. A new CHF correlation is then proposed by replacing the global variables in the Kaminaga correlation with local ones and adding correction factors to consider the effect of gap size, mass flux, and the number of heating walls. Additional correction factor is added to consider the effect of inlet subcooling. It is shown that the new one is better than the Kaminaga correlation and it is easy to implement to any system code.
Keywords
Critical heat flux; Downward-flow rectangular channel; Thermal-hydraulic system code; A new correlation;
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Times Cited By KSCI : 2  (Citation Analysis)
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