Performance assessment of longitudinal flow through rod bundle arrangements using entropy generation minimization approach. (15th July 2015)

• Record Type: Journal Article
• Authors: Poddar, Antarip; Chatterjee, Rajeswar; Ghosh, Koushik; Mukhopadhyay, Achintya; Sen, Swarnendu
• Is Part Of: Energy conversion and management. Volume 99(2015)
• Page Start: 359
• Page End: 373
• Publication Date: 2015-07-15
• Subjects: Central subchannels -- Entropy -- Optimal Reynolds number -- Constraints; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.04.075
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: We perform an entropy generation analysis for turbulent flow through interior subchannels with three different constraints. The results show excellent agreement with equivalent annulus solution. For pitch to diameter ratio constraint the square subchannel is more acceptable than triangular one. The other two constraints result in different characteristics to the above. Effects of duty parameter, dimensionless wall heat flux and length to diameter ratio of fuel rods have been analyzed. Abstract: Longitudinal flow through central subchannel structures in an array of fuel rods in a nuclear reactor plays an important role in removing the heat generated inside the fuel rods. In this paper, an entropy generation analysis has been carried out for assessment of the performance of an infinite triangular as well as a square subchannel for single-phase forced turbulent flow. The performance is evaluated with the objective function being the overall entropy generation in a central subchannel. Various constraints such as dimensionless flow area subtended by the array of rods, pitch to diameter ratio for the configuration of rod bundles and volumetric heat generation to power density ratio of the subchannel imposed by power restrictions have been considered. The parameters include the dimensionless wall heat flux, duty parameter, length to diameter ratio for fuel rods, Reynolds number etc. It has been observed that for a pitch to diameter ratio constraint the square subchannel generates lesser amount of entropy and thus more acceptable compared to triangular structure. For the same constraint the optimum Reynolds number shifts towards higher value compared to triangular one. For dimensionless flow area constraint, on the other hand, the analysis reveals completely reverse phenomenon.