Experimental study on flow boiling heat transfer of R134a in mini channel with diamond pin fin array

doi:10.11949/0438-1157.20230784

Abstract

Abstract:

The flow boiling heat transfer characteristics of refrigerant R134a in rhombus discrete rib mini channels with angles of 30°, 60° and 90° were studied. The distribution area of diamond pin fin array in the mini channel is 300 mm long and 20 mm wide. The experiments were performed at a saturation pressure of (700±5) kPa at the inlet of the test channel, vapor quality from 0 to 1, mass flux between 200 kg/(m²·s) and 500 kg/(m²·s), and heat flux in range of 10—30 kW/m². The results indicate that the flow boiling in the pin fin array is governed by nucleate boiling and convective boiling, the boiling heat transfer coefficient increases with the increase of mass flux and heat flux, but as vapor quality increases, the influence of heat flux almost disappears. In addition, differences in geometry of pin fin will affect the flow boiling heat transfer, the heat transfer coefficient of the diamond pin fin array at 90° is higher than that at 30°and 60°, and it is more significant at high vapor quality. Finally, on the basis of the analysis conclusion and the experimental data, a new correlation is proposed to predict the flow boiling heat transfer coefficient for mini channel with pin fin array of different structures.

Key words: pin fin array, microscale, flow boiling, heat transfer, two-phase flow

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。

关键词: 离散肋, 微尺度, 流动沸腾, 传热, 两相流

CLC Number:

TK 124

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.

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.

Figures/Tables 15

Fig.1 Schematic diagram of the experimental system

Table 1 The experimental operating condition

参数	实验范围
G/(kg/(m²·s))	200~500
P_sat,e/kPa	700
q/(kW/m²)	10~30
x	0~1

Fig.2 Real pictures for test section

Table 2 Structure size of mini channel with diamond pin fin array

编号	θ/(°)	S_L/mm	S_T/mm	S_g/mm	h/mm	W_f/mm	L_f/mm	N_L
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

Fig.3 Results of energy balance verification

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%
x_k	±2.4%
h_tp	±10.5%

Fig.4 Distribution of saturation temperature, wall temperature and flow boiling heat transfer coefficient in flow direction

Fig.5 Effect of pin fin array geometry on boiling heat transfer coefficient

Fig.6 Effect of mass flux on boiling heat transfer coefficient

Fig.7 Effect of heat flux on boiling heat transfer coefficient

Table 4 Formulations of the selected existing correlations

文献	关联式形式	工况范围
[17]	$h t p = S h n b + F h s p, l s$	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
[18]	$h t p = F h s p = ξ ϕ l 2 0.2475 P r 0.333 h s p, l o$	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
[29]	$h t p = S h s p, l s 2 + F h s p, l s 2 0.5$	平直微通道数据来自37篇文献，包括18种流体工质
[28]	$h t p = S h n b 2 + F h s p, l s 2 0.5$	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

Table 4 Formulations of the selected existing correlations

文献	关联式形式	工况范围
[17]	$h t p = S h n b + F h s p, l s$	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
[18]	$h t p = F h s p = ξ ϕ l 2 0.2475 P r 0.333 h s p, l o$	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
[29]	$h t p = S h s p, l s 2 + F h s p, l s 2 0.5$	平直微通道数据来自37篇文献，包括18种流体工质
[28]	$h t p = S h n b 2 + F h s p, l s 2 0.5$	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

Fig.8 The prediction of correlations to experimental data

Table 5 Prediction accuracy of the correlations

文献	D30		D60		D90
文献	MAD/%	MRD/%	MAD/%	MRD/%	MAD/%	MRD/%
[29]	42.38	-42.38	43.14	-43.14	42.75	-42.75
[17]	20.80	-19.97	23.04	-22.53	21.57	-21.21
[18]	156.28	156.28	148.00	148.00	141.05	141.05
[28]	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

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

Fig.9 The results of the evaluation of the new correlation

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