Loading…

Evaluation of identification methods for heat transfer deterioration of supercritical CO2

Heat transfer deterioration (HTD) identification is essential for establishing heat transfer correlations and HTD criteria. To assess the accuracy of various HTD identification methods, an experimental investigation of the convective heat transfer characteristics of supercritical CO2 in heated tubes...

Full description

Saved in:
Bibliographic Details
Published in:International communications in heat and mass transfer 2023-06, Vol.145, p.106831, Article 106831
Main Authors: Ren, Qianqian, Qiu, Qinggang, Qiu, Guangyu, Yu, Xiao, Zhu, Xiaojing
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Heat transfer deterioration (HTD) identification is essential for establishing heat transfer correlations and HTD criteria. To assess the accuracy of various HTD identification methods, an experimental investigation of the convective heat transfer characteristics of supercritical CO2 in heated tubes with diameters of 8 and 14.5 mm was conducted. In addition, data from published literature were used as supplements for ranges not covered by this experiment. The evaluation of identification methods was conducted for tube diameters ranging from 2 to 22 mm, pressures from 7.5 to 21.1 MPa, mass fluxes from 50 to 1600 kg/m2·s, and heat fluxes from 6 to 375 kW/m2. Based on these datasets, the accuracy and the appropriate application of each method were determined. The results showed that the Nu/Nudb and Gupta et al. methods are not sufficiently accurate and cannot reflect the heat transfer trend reliably. The Kline et al. method may produce illogical results in cases of a large q/G. The Xie et al. method is not effective in heat transfer enhancement (HTE) cases and HTD cases, where the wall temperature profile changes slowly. Both the Lokshin et al. and Zhang et al. methods require prior addition or adjustment of correction factors.
ISSN:0735-1933
1879-0178
DOI:10.1016/j.icheatmasstransfer.2023.106831