Numerical characterization of heat transfer deterioration in supercritical natural circulation loop and role of loop inclination

Srivastava, Tanuj; Basu, Debabrata

doi:10.1016/j.nucengdes.2022.111704

Cited by 11 publications

(2 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This positioning allows the fluid to flow as the density alters within the channel [4]. One type of this system is the NC loop, wherein the flow circulates in a closed-loop configuration [5]. Due to its characteristics, NC loops are implemented in a wide range of applications, such as nuclear power plants [6], electronic cooling [7], and solar heat collectors [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow Stability in a Natural Circulation Loop

Rahman,

Murti,

Ilham

2024

View full text Add to dashboard Cite

Flow modeling of a natural circulation loop is of high importance in ensuring the stability of the system. As a system relying on buoyancy force, several parameters play a crucial role in determining stability. In this study, a one-dimensional numerical model is employed to predict the mass flow rate and stability due to the variation of heated riser and cooled faller locations. The result shows that the highest flow rate of 0.344 kg/s is obtained as the heater is located at the lowest position, while the cooler remains at the top. Furthermore, a stability map is plotted to show the condition for the stability, whereby the result demonstrates that the location with a relatively low mass flow rate exhibits a higher chance of oscillating flow.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow Stability in a Natural Circulation Loop

Rahman,

Murti,

Ilham

2024

View full text Add to dashboard Cite

show abstract

“…Sahu et al [28,29] conducted a numerical transient analysis on a natural circulation loop with a hybrid nanofluid with a 1% concentration. Similarly, the influence of fin size and shape, inclination angle, various channel systems, and flow stability tests in the loop [30][31][32][33][34] were also investigated. The results demonstrate that when the temperature difference exceeds a certain point, the NCL's heat transfer rate can be greater than the copper fins.…”

mentioning

confidence: 99%

Examining the potential of sigma-thermic heat transfer fluid and its nanofluid in a natural circulation loop through CFD studies

Nagaraju,

Mohammad,

Mendu

et al. 2024

Eng. Res. Express

View full text Add to dashboard Cite

This study investigates the impact of hot heat exchanger (HHX) inlet temperature on Sigma-thermic heat transfer fluid (STHF or STF) performance in a natural circulation loop. Various fluids, including STHF and STHF-based nanofluids, with volumetric concentrations ranging from 0.5% to 3%, are employed in the loop. The primary objective is to analyze the thermal performance of the loop under different conditions, focusing on temperature distribution, Nusselt number, friction factor, effectiveness, and mass flow rate. 3D numerical simulations are conducted, and the numerical model is validated against existing literature. The developed model incorporates considerations for viscous dissipation and axial conduction to predict the heat transfer potential of the loop. As the HHX inlet temperature increases, the mass flow rate rises. Notably, STHF/CuO nanofluids exhibit a more substantial enhancement than other nanofluids. At a 1 vol% concentration, the mass flow rate increases by 9.5%, 4%, and 2.7% for STHF/CuO, STHF/Al2O3, and hybrid nanofluids, respectively, compared to pure STHF. The study reveals significant improvements in mass flow rates and heat transfer efficiency with increasing HHX inlet temperatures, especially with STHF/CuO nanofluids. The total entropy generation reduction is notable, with percentages ranging from 2% to 18.5% for various nanofluids compared to pure STHF

show abstract