化工学报 ›› 2023, Vol. 74 ›› Issue (9): 3797-3806.DOI: 10.11949/0438-1157.20230784
王玉兵1,2(), 李杰1, 詹宏波2, 朱光亚1, 张大林1()
收稿日期:
2023-08-01
修回日期:
2023-09-04
出版日期:
2023-09-25
发布日期:
2023-11-20
通讯作者:
张大林
作者简介:
王玉兵(1980—),男,博士研究生, jl1901031@nuaa.edu.cn
基金资助:
Yubing WANG1,2(), Jie LI1, Hongbo ZHAN2, Guangya ZHU1, Dalin ZHANG1()
Received:
2023-08-01
Revised:
2023-09-04
Online:
2023-09-25
Published:
2023-11-20
Contact:
Dalin ZHANG
摘要:
研究了制冷剂R134a在角度分别为30°、60°和90°的菱形离散肋微小通道内的流动沸腾换热特性。微小通道内菱形离散肋分布区域长300 mm、宽20 mm,进口处饱和压力为(700±5) kPa,其他工况范围为:干度0~1,质量流率200~500 kg/(m2·s),热通量10~30 kW/m2。实验结果表明:离散肋中的流动沸腾换热受到核态沸腾和对流沸腾的共同作用,传热系数随质量流率和热通量的增加而增加,但随着干度的升高,热通量的作用减弱并趋于消失。此外,离散肋结构对流动沸腾换热有显著影响,相同工况下,90°菱形离散肋的传热系数高于30°和60°,且在高干度更显著。最后,基于实验数据和分析结论,提出了一个适用于预测不同结构离散肋微小通道中流动沸腾传热系数的计算关联式。
中图分类号:
王玉兵, 李杰, 詹宏波, 朱光亚, 张大林. R134a在菱形离散肋微小通道内的流动沸腾换热实验研究[J]. 化工学报, 2023, 74(9): 3797-3806.
Yubing WANG, Jie LI, Hongbo ZHAN, Guangya ZHU, Dalin ZHANG. Experimental study on flow boiling heat transfer of R134a in mini channel with diamond pin fin array[J]. CIESC Journal, 2023, 74(9): 3797-3806.
参数 | 实验范围 |
---|---|
G/(kg/(m2·s)) | 200~500 |
Psat,e/kPa | 700 |
q/(kW/m2) | 10~30 |
x | 0~1 |
表1 实验工况
Table 1 The experimental operating condition
参数 | 实验范围 |
---|---|
G/(kg/(m2·s)) | 200~500 |
Psat,e/kPa | 700 |
q/(kW/m2) | 10~30 |
x | 0~1 |
编号 | θ/(°) | SL/mm | ST/mm | Sg/mm | h/mm | Wf/mm | Lf/mm | NL |
---|---|---|---|---|---|---|---|---|
D30 | 30 | 5.41 | 2 | 1.4 | 0.5 | 1 | 3.73 | 56 |
D60 | 60 | 2.80 | 2 | 1.4 | 0.5 | 1 | 1.73 | 108 |
D90 | 90 | 1.98 | 2 | 1.4 | 0.5 | 1 | 1.00 | 152 |
表 2 微小菱形离散肋几何尺寸
Table 2 Structure size of mini channel with diamond pin fin array
编号 | θ/(°) | SL/mm | ST/mm | Sg/mm | h/mm | Wf/mm | Lf/mm | NL |
---|---|---|---|---|---|---|---|---|
D30 | 30 | 5.41 | 2 | 1.4 | 0.5 | 1 | 3.73 | 56 |
D60 | 60 | 2.80 | 2 | 1.4 | 0.5 | 1 | 1.73 | 108 |
D90 | 90 | 1.98 | 2 | 1.4 | 0.5 | 1 | 1.00 | 152 |
计算参数 | 不确定度 |
---|---|
P | 0.2% |
G | 0.25% |
T | ±0.2℃ |
q | 0.5% |
xk | ±2.4% |
htp | ±10.5% |
表3 参数不确定度
Table 3 Uncertainty of calculation parameters
计算参数 | 不确定度 |
---|---|
P | 0.2% |
G | 0.25% |
T | ±0.2℃ |
q | 0.5% |
xk | ±2.4% |
htp | ±10.5% |
文献 | 关联式形式 | 工况范围 |
---|---|---|
[ | 顺排的方形肋 工质:R-113 G: 50~250 kg/(m2·s) q: 0.5~14 W/cm2 P:1 bar | |
[ | 交错排列的圆形肋 工质:水 G: 346~794 kg/(m2·s) q: 50~350 W/cm2 P:1 bar | |
[ | 平直微通道 数据来自37篇文献,包括18种流体工质 | |
[ | 交错排列的菱形肋 工质:R134a G: 200~500 kg/(m2·s) q: 15~30 kW/m2 P:5~7 bar |
表4 现有沸腾换热关联式
Table 4 Formulations of the selected existing correlations
文献 | 关联式形式 | 工况范围 |
---|---|---|
[ | 顺排的方形肋 工质:R-113 G: 50~250 kg/(m2·s) q: 0.5~14 W/cm2 P:1 bar | |
[ | 交错排列的圆形肋 工质:水 G: 346~794 kg/(m2·s) q: 50~350 W/cm2 P:1 bar | |
[ | 平直微通道 数据来自37篇文献,包括18种流体工质 | |
[ | 交错排列的菱形肋 工质:R134a G: 200~500 kg/(m2·s) q: 15~30 kW/m2 P:5~7 bar |
文献 | D30 | D60 | D90 | |||
---|---|---|---|---|---|---|
MAD/% | MRD/% | MAD/% | MRD/% | MAD/% | MRD/% | |
[ | 42.38 | -42.38 | 43.14 | -43.14 | 42.75 | -42.75 |
[ | 20.80 | -19.97 | 23.04 | -22.53 | 21.57 | -21.21 |
[ | 156.28 | 156.28 | 148.00 | 148.00 | 141.05 | 141.05 |
[ | 19.62 | 7.16 | 15.70 | -1.1 | 27.64 | -21.69 |
本文 | 18.75 | 4.26 | 15.20 | 0.84 | 18.30 | 6.03 |
表5 关联式的预测精度
Table 5 Prediction accuracy of the correlations
文献 | D30 | D60 | D90 | |||
---|---|---|---|---|---|---|
MAD/% | MRD/% | MAD/% | MRD/% | MAD/% | MRD/% | |
[ | 42.38 | -42.38 | 43.14 | -43.14 | 42.75 | -42.75 |
[ | 20.80 | -19.97 | 23.04 | -22.53 | 21.57 | -21.21 |
[ | 156.28 | 156.28 | 148.00 | 148.00 | 141.05 | 141.05 |
[ | 19.62 | 7.16 | 15.70 | -1.1 | 27.64 | -21.69 |
本文 | 18.75 | 4.26 | 15.20 | 0.84 | 18.30 | 6.03 |
编号 | a | b |
---|---|---|
D30 | 0.024 | 0.92 |
D60 | 0.019 | 0.95 |
D90 | 0.013 | 0.99 |
表6 参数a、b的取值
Table 6 The values of factor a and b
编号 | a | b |
---|---|---|
D30 | 0.024 | 0.92 |
D60 | 0.019 | 0.95 |
D90 | 0.013 | 0.99 |
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