Visualization of local boundary thermal flow field of supercritical CO2 inside a rectangular channel

doi:10.11949/0438-1157.20240056

Abstract

Abstract:

Accurate measurement of the boundary heat transfer characteristics of supercritical CO₂ flow-through a channel is crucial for the safe design and operation of advanced supercritical CO₂ cycle systems. The research is based on an improved non-contact phase-shifting laser interference system to explore the evolution trend of the boundary thermal flow field of supercritical CO₂ in a rectangular cross-section channel under turbulent conditions. A phase-shift technique is utilized to analyze the transient variations in density and temperature fields following the sudden localized heat addition applied in the bottom boundary. These quantitative data are used to estimate the local criterion numbers for supercritical boundary heat transfer under different heat flux (q = 14057, 5500, 2014 W/m²). The results indicate that the rapid density reduction (1.8 kg/m³) occurs in a localized boundary transfer process. The buoyancy force induces the turbulent mixing from the boundary to the bulk flow region, eventually reaching equilibrium. Relatively dramatic and rapid shifts in temperature and density gradients occurs under high heat flux conditions, emphasizing the fast generation and transport of thermal boundary layers.

Key words: convection, hydrodynamics, transport process, supercritical carbon dioxide, measurement

摘要：

准确测量超临界CO₂的边界层流动传热特性，对于先进超临界CO₂能源化工循环系统的设计和安全运行具有重要意义。研究基于一种改进的非接触式的相移激光干涉系统，探究了湍流条件下超临界CO₂在矩形截面通道的边界热流场演化趋势。研究分析了基于长直通道局部热量输入条件下边界层密度场和温度场瞬态变化。这些定量信息可用于评估超临界CO₂在不同热通量（q = 14057、5500、2014 W/m²）条件下的局部传热准则数。结果表明：局部边界热传输使边界流体密度快速下降了1.8 kg/m³；浮升力驱动边界流体与主流区域混合并迅速达到平衡状态；高热流条件下温度、密度梯度变化迅速且显著，显示了热边界层的快速形成。

关键词: 对流, 流体动力学, 传递过程, 超临界二氧化碳, 测量

CLC Number:

TQ 016

Gang ZENG, Lin CHEN, Dong YANG, Haizhuan YUAN, Yanping HUANG. Visualization of local boundary thermal flow field of supercritical CO₂ inside a rectangular channel[J]. CIESC Journal, 2024, 75(8): 2831-2839.

曾港, 陈林, 杨董, 袁海专, 黄彦平. 矩形通道内超临界CO₂局部热流场可视化实验[J]. 化工学报, 2024, 75(8): 2831-2839.

Figures/Tables 10

Fig.1 Scheme of supercritical CO2 boundary transport model at the horizontal rectangular channel

Fig.2 Schematic diagram of the experimental system for visualizing local point boundary heat transfer (the system is housed in a specially designed thermostatic room for a stable temperature ambient; arrow for the flow direction)

Table 1 Summary of experimental parameters of cases

工況	p/MPa	∆p/Pa	T/K	ρ/(kg/m³)	q/(W/m²)	Re
1	7.933	62.02	306.57	570.66	14057	33616
2	7.972	62.84	306.52	586.77	5500	33036
3	7.967	45.21	306.4	593.01	2014	27218

Fig.3 Transient visualization in stabilized differential pressure flow (0—3 s) (case 1; heating t = 3—3.5 s; 20 fps)

Fig.4 Transient visualization in heating adding processes (3—10 s) (case 1; heating t = 3—3.5 s; 20 fps)

Fig.5 Transient visualization in re-equilibrium processes (3—10 s) (case 1; heating t = 3—3.5 s; 20 fps)

Fig.6 Transient visualization in heating adding processes (3—10 s) (case 3; heating t = 3—3.5 s; 20 fps)

Fig.7 Quantitative density and temperature profiles on the vertical centerline (x = 3.17 mm) (case 1; heating t = 3—3.5 s; 20 fps)

Fig.8 Quantitative density and temperature profiles on the vertical centerline (x = 3.17 mm) (case 3; heating t = 3—3.5 s; 20 fps)

Fig.9 Evolution of the local Nusselt number for boundary heat transfer under pulsed heated channel (heating t = 3—3.5 s; 20 fps)

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Visualization of local boundary thermal flow field of supercritical CO₂ inside a rectangular channel

矩形通道内超临界CO₂局部热流场可视化实验

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References 32

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