CFD analyses and correlation of pressure losses on the shell-side of concentric, helically-coiled tubes heat exchangers

Haskins, Denise A.; El‐Genk, Mohamed S.

doi:10.1016/j.nucengdes.2016.05.014

Cited by 38 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is a growing interest in the nuclear community for heat exchangers that extract the thermal power carried by the LM and convey it to a secondary fluid, being that water, helium, or carbon dioxide [3][4][5]. In recent years, the attention has been focused on heat exchangers where the LM is flowing shell side and the heat transfer regime can be described as an external cross-flow on tube banks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

et al. 2022

View full text Add to dashboard Cite

Heavy liquid metals (HLM) are attractive coolants for nuclear fission and fusion applications due to their excellent thermal properties. In these reactors, a high coolant flow rate must be processed in compact heat exchangers, and as such, it may be convenient to have the HLM flowing on the shell side of a helical coil steam generator. Technical knowledge about HLM turbulent heat transfer in cross-flow tube bundles is rather limited, and this paper aims to investigate the suitability of Reynolds Average Navier–Stokes (RANS) models for the simulation of this problem. Staggered and in-line finite tube bundles are considered for compact (a=1.25), medium (a=1.45), and wide (a=1.65) pitch ratios. The lead bismuth eutectic alloy with Pr=2.21×10−2 is considered as the working fluid. A 2D computational domain is used relying on the k−ω Shear Stress Transport (SST) for the turbulent momentum flux and the Prt concept for the turbulent heat flux prediction. The effect of uniform and spatially varying Prt assumptions has been investigated. For the in-line bundle, unsteady k−ω SST/Prt=0.85 has been found to significantly underpredict the integral heat transfer with regard to theory, featuring a good to acceptable agreement for wide bundles and Pe≥1150. For the staggered tube bank, steady k−ω SST and a spatially varying Prt has been the best modeling strategy featuring a good to excellent agreement for medium and wide bundles. A poor agreement for compact bundles has been observed for all the models considered.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

et al. 2022

View full text Add to dashboard Cite

show abstract

Numerical investigation on gas flow heat transfer and pressure drop in the shell side of spiral-wound heat exchangers

Tang

Chen

Yang

et al. 2017

Sci. China Technol. Sci.

View full text Add to dashboard Cite

Heat Transfer and Fluid Flow Analysis for Turbulent Flow in Circular Pipe with Vortex Generator

Rambhad¹,

Kalbande

Kumbhalkar³

et al. 2021

SN Appl. Sci.

View full text Add to dashboard Cite

The performance of heat transfer enhancement (HTE) using modified inserts (MIs) as a vortex generator in pipe flow and fluid flow analysis using computational fluid dynamics (CFD) are evaluated in this article. The MIs are fastened to the central rod, and the circular sections of the MIs touched the circular wall of the test pipe. Heat transfer and fluid flow analyses are carried out for the various pitch to diameter ratios (P/D) and angles of the MIs. P/D ratios of 3, 4 and 6 and MIs angles of 15°, 30°, 45°, 60° and 90° are considered for experimental analysis. CFD analysis is carried out for P/D ratios of 3, 4 and 6 and MIs angles of 30°, 45° and 90°. Nusselt number (Nu/Nus) and friction factor (f/fs) ratios are evaluated using the same Reynolds number between 8000 and 17,000 in the experimental study. The MIs encourage the wall and core fluid to be combined thus helps in HTE. It is found that, as the P/D ratio increases, the Nu/Nus and f/fs decrease. If the distance between the MIs increases, the mixing of fluid weakens. With decreasing the P/D ratio, Nu/Nus increases. Increased fluid mixing leads to a higher coefficient of heat transfer and higher values of pressure drop. A P/D ratio of 4 and MIs angle of 45° results in greater heat interaction than others. Finally, recommendations for the best P/D ratio and angles of MIs are made for improved HTE on fluid flow through a circular pipe. Article Highlights Modified inserts (MIs) are used inside the test pipe to check the heat transfer enhancement at various angles. Also, compared the performance with and without MIs. Fluid flow analysis is checked by CFD (Fluent) in Ansys software. Fluid flow patterns for various MIs angles and P/D ratios are compared.

show abstract

CFD analyses and correlation of pressure losses on the shell-side of concentric, helically-coiled tubes heat exchangers

Cited by 38 publications

References 23 publications

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

Numerical investigation on gas flow heat transfer and pressure drop in the shell side of spiral-wound heat exchangers

Heat Transfer and Fluid Flow Analysis for Turbulent Flow in Circular Pipe with Vortex Generator

Contact Info

Product

Resources

About