Numerical investigation on heat transfer of supercritical water in a side-heated square channel

doi:10.11949/0438-1157.20211532

Abstract

Abstract:

The heat transfer of supercritical water in a side-heated square channel with auxiliary coolant is numerically investigated, and the mechanisms of heat transfer deterioration and recovery are explained in terms of boundary layer thickness and turbulent kinetic energy in the near-wall region. The heat transfer correlations for supercritical water heat transfer in a side-heated square channel under different conditions (pressure, inlet temperature, heat flux, mass flow, flow direction and pipe diameter) are examined and the Fan correlation achieves the highest prediction agreement. The PEC factor is employed to evaluate different enhanced heat transfer structures (dual channels and grooves). It is found that the PEC factor of upper and lower dual channel is generally less than 1, and the overall heat transfer enhancement is low. The PEC factor of the downstream asymmetric chamfered groove is in the range of 1.13—1.51, and the maximum value is achieved under different working conditions. The field synergy analysis also proves that the down stream asymmetric chamfered groove structure has the best comprehensive heat transfer performance.

Key words: numerical simulation, supercritical water, heat transfer, correlation, enhanced structure

摘要：

数值模拟了辅助冷却剂超临界水在单侧加热方形通道中的流动传热特性，从边界层厚度与近壁区湍动能两方面阐述传热恶化产生和恢复的机理。研究了不同工况（压力、入口温度、热通量、质量流量、流动方向和管径）下超临界流体常用传热关联式的适用性，发现Fan关联式预测精度较高。采用PEC因子对不同强化传热结构（双通道和凹槽）进行评价，发现上下双通道PEC因子普遍小于1，综合强化换热效果不佳，而偏下游的非对称倒角凹槽结构PEC因子为1.13~1.51，不同工况下均为最大值。场协同原理分析也证明偏下游的非对称倒角凹槽结构具有最佳的综合换热性能。

关键词: 数值模拟, 超临界水, 传热, 关联式, 强化结构

CLC Number:

TK 121

Zhihao HUANG, Guangxi LI, Guihua TANG, Xiaolong LI, Yuanhong FAN. Numerical investigation on heat transfer of supercritical water in a side-heated square channel[J]. CIESC Journal, 2022, 73(4): 1523-1533.

黄志豪, 李光熙, 唐桂华, 李小龙, 范元鸿. 单侧加热方形通道内超临界水传热研究[J]. 化工学报, 2022, 73(4): 1523-1533.

Figures/Tables 14

Fig.1 Schematic of square channel

Fig.2 Schematic of grooves

Table 1 Conditions of numerical simulation

Case	P/ MPa	G/ (kg·m^-2·s^-1)	q_w/ (kW·m^-2)	D/ mm	T_in/ K	流向
1	23	500	1000	8	573	向上
2	23	500	200	8	573	向上
3	25	500	1000	8	573	向上
4	28	500	1000	8	573	向上
5	23	500	1000	8	373	向上
6	23	500	1000	8	673	向上
7	23	200	1000	8	573	向上
8	23	1000	1000	8	573	向上
9	23	1500	1000	8	573	向上
10	23	500	1000	30	573	向上
11	23	500	1000	25	573	向上
12	23	500	1000	20	573	向上
13	23	500	1000	15	573	向上
14	23	500	1000	10	573	向上
15	23	500	1000	2	573	向上
16	23	500	1000	8	573	水平
17	23	500	1000	8	573	向下

Fig.3 Comparison between available experimental and present numerical results

Fig.4 h/hDB on the inner wall with and without gravity

Fig.5 Effect of boundary layer thickness

Fig.6 Effect of near-wall turbulent kinetic energy

Fig.7 Comparison between the correlations and present numerical results

Fig.8 Average temperature on the heated surface against heating length

Fig.9 Nu/Nu0 of different enhanced structures

Fig.10 PEC of different enhanced structures

Fig.11 Streamlines around various grooves

Fig.12 Distribution of synergy angle β around various grooves

Fig.13 Distribution of synergy angle α around various grooves

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