Numerical study on flow and heat transfer of supercritical carbon dioxide under non-uniform heat flux influences

被引：0
|
作者：
Dai, Wei [1 ]
Shi, Shenzhou [2 ]
Fu, Yanchen [2 ]
Zuo, Yang [2 ]
机构：
[1] Beijing Institute of Astronautical Systems Engineering, Beijing
[2] Research Institute of Aero-Engine, Beihang University, Beijing
来源：
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | 2024年 / 50卷 / 10期
基金：
中国国家自然科学基金;
关键词：
buoyancy lift; carbon dioxide; convective heat transfer; non-uniform heat flux; supercritical fluids;
D O I：
10.13700/j.bh.1001-5965.2022.0769
中图分类号：
学科分类号：
摘要：
In some extreme conditions, heat flux with high density is non-uniformly distributed on the surface. To address this issue, this paper analyzed the influence of non-uniform heat flux on the flow and heat transfer characteristics of supercritical carbon dioxide by employing numerical calculation and analysis methods. Numerical simulations were sequentially performed to analyze the flow and heat transfer of supercritical carbon dioxide in a horizontal circular tube with a diameter of 4 mm under two sets of linear non-uniform heat flux conditions including the same total heat flux with different slopes, as well as different total heat fluxes with the same slope. The influence of the distribution of thermophysical properties and buoyancy lift on the convective heat transfer characteristics under linear non-uniform heat flux conditions was obtained. The simulation results show that the heat transfer of the upper wall near the entrance of the heating section under non-uniform heat flux conditions severely deteriorates compared with that under uniform heat flux. The maximum tube wall temperature under linear non-uniform heat flux is 1.66 times that under uniform heat flux. Furthermore, numerical simulations of flow and heat flux of supercritical carbon dioxide on a given actual surface heat flux boundary are carried out, and the maximum tube wall temperature at the entrance of the heating section is 3.41 times that at the outlet, while the ratio decreases to 1.50 when the flow direction changes. Relevant suggestions are offered for cooling solutions using supercritical carbon dioxide as a working medium. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
引用
收藏
页码：3074 / 3083
页数：9
相关论文
共 38 条
  • [1] ESKANDARI MANJILI F, CHERAGHI M., Performance of a new two-stage transcritical CO<sub>2</sub> refrigeration cycle with two ejectors, Applied Thermal Engineering, 156, pp. 402-409, (2019)
  • [2] TSAI W C, WANG Y D., Progress of supercritical fluid technology in polymerization and its applications in biomedical engineering, Progress in Polymer Science, 98, (2019)
  • [3] LIU Y H, LI Q L, DUAN X L, Et al., Thermodynamic analysis of a modified system for a 1000 MW single reheat ultra-supercritical thermal power plant, Energy, 145, pp. 25-37, (2018)
  • [4] FEWSTER J., Mixed forced and free convective heat transfer to supercritical pressure fluids flowing in vertical pipes, pp. 11-19, (1976)
  • [5] BRINGER R P, SMITH J M., Heat transfer in the critical region, AIChE Journal, 3, 1, pp. 49-55, (1957)
  • [6] BOYKO L D, KRUZHILIN G N., Heat transfer and hydraulic resistance during condensation of steam in a horizontal tube and in a bundle of tubes, International Journal of Heat and Mass Transfer, 10, 3, pp. 361-373, (1967)
  • [7] ADEBIYI G A, HALL W B., Experimental investigation of heat transfer to supercritical pressure carbon dioxide in a horizontal pipe, International Journal of Heat and Mass Transfer, 19, 7, pp. 715-720, (1976)
  • [8] PIDAPARTI S R, MCFARLAND J A, MIKHAEIL M M, Et al., Investigation of buoyancy effects on heat transfer characteristics of supercritical carbon dioxide in heating mode, Journal of Nuclear Engineering and Radiation Science, 1, 3, (2015)
  • [9] CHU X, LAURIEN E., Investigation of convective heat transfer to supercritical carbon dioxide with direct numerical simulation, Proceedings of the High Performance Computing in Science and Engineering, pp. 315-331, (2016)
  • [10] KOYAMA S., Heat transfer and pressure drop of supercritical carbon dioxide in multi-port channels, Journal of Engineering Thermophysics, 25, 5, pp. 843-845, (2004)
1234