Evaporation pressure drop characteristics of R404Ain 5mm microfin tube

doi:10.16085/j.issn.1000-6613.2018-2166

Abstract

Abstract:

The characteristics of pressure drop for R404A evaporation in 5mm microfin tube were studied, in order to provide theoretical support for the feasibility of using the small diameter of the heat exchanger in the cold chain. Experimental conditions were saturated temperature 0℃, heat flux 5—25kW/m², mass flux 200—500kg/(m²·s), vapor quality 0.1—0.9. The results showed that the increase of mass flow rate will not only increase the friction pressure drop, but also change the trend of friction pressure drop changing with vapor quality ahead of time. Heat flux has less influence on the friction pressure drop. The friction pressure drop doer not change and maxinum value appears ahead of time with the enhance of heat flux at vapor quality range from 0.1 to 0.7. Compared with the smooth tube, the friction pressure drop in the microfin tube is higher and the mass flow rate will increase. The increment of frictional pressure drop is increased. The minimum increment appears at vapor quality 0.4,and increase subsequently. The comparison between the experimental data and the theoretical prediction model showed that modified Kim's model can better predict the experimental data. The absolute average deviation is 11.54%. It is presented with 85.23% of predicted points within ±30%.

Key words: evaporation pressure drop, two-phase flow, microfin tube, R404A, model

摘要：

为了给冷链用换热器小管径的可行性提供理论支持，对R404A制冷剂在5mm微肋管内流动沸腾压降特性进行了实验研究。实验工况为：饱和温度为0℃、热通量为5～25kW/m²、质量流速为200～500kg/(m²·s)、干度为0.1～0.9。研究结果表明：质量流速的提高不仅会增大摩擦压降，同时使摩擦压降随干度变化的趋势提前转变；摩擦压降受热通量的影响较小，在0.1～0.7的干度区间，摩擦压降不随热通量的增大而改变，热通量仅会使摩擦压降的拐点提前出现；与光滑管相比，微肋管内的两相流动摩擦压降较高，增大质量流速会提高摩擦压降的增量，当干度值为0.4时，增量出现极值，随后增量逐渐上升。本实验研究的数据与理论预测模型的对比显示：修正后的Kim模型能够较佳的预测本实验数据，绝对平均偏差11.54%，偏差幅度±30%以内的数据多达85.23%。

关键词: 蒸发压降, 两相流, 微肋管, R404A, 模型

CLC Number:

TB69

Kuan HE,Jianhua LIU,Liang ZHANG,Xiaoxiao YU. Evaporation pressure drop characteristics of R404Ain 5mm microfin tube[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3548-3555.

何宽,柳建华,张良,余肖霄. 5mm微肋管内R404A流动沸腾压降特性[J]. 化工进展, 2019, 38(08): 3548-3555.

Figures/Tables 11

References 28

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文献	工质	通道尺度/mm	研究内容	饱和温度/℃	热通量/kW·m^-2	质量流速/kg·m^-2·s^-1
Kim等^[7]	R22, R410A	6.2, 5.1	沸腾压降	-5～5	5～10	410～600
Kim等^[8]	R410A	7	沸腾压降	8～12	9～17	216～390
Zhang等^[9]	R22, R410A, R407	1.088, 1.289	沸腾压降	30, 40	—	300～600
Wellsandt等^[10]	R410, R407C	9.53	沸腾压降	-2.2～9.5, -5.5～13.8	0.1～44	162～415
Han等^[11]	R161	7	沸腾压降	-5～8	28.15～49.29	100～250
Nidegger等^[12]	R134a/oil	11.9	沸腾压降	入口343kPa	5～10	100～300
Ding等^[13]	R410A/oil	5	沸腾压降	5	7.65～15.12	250～400
Baba等^[14]	R1234ze(E)/R32	5.21	沸腾压降	10	—	150～400
吴昊等^[15]	CO₂	1, 2, 3	干涸特性	-10～10	2～35	50～1350
Mancin等^[16]	R134A	3.4	沸腾压降	30	10～50	190～755
陆至羚等^[17]	CO₂	1, 2, 3	干涸特性	-10～15	2～34	50～1350
Lee等^[18]	R290, R600a, R134a	10.07, 7.73, 6.54, 5.80	冷凝压降	40	—	35.5～210.4
Hossain等^[19]	R1234ze(E), R32, R410A	4.35	冷凝压降	35～45	11～44	140～400
Huang等^[20]	R134a/oil	4, 5	冷凝压降	40	4.21～8.42	200～500

文献	工质	通道尺度/mm	研究内容	饱和温度/℃	热通量/kW·m^-2	质量流速/kg·m^-2·s^-1
Kim等^[7]	R22, R410A	6.2, 5.1	沸腾压降	-5～5	5～10	410～600
Kim等^[8]	R410A	7	沸腾压降	8～12	9～17	216～390
Zhang等^[9]	R22, R410A, R407	1.088, 1.289	沸腾压降	30, 40	—	300～600
Wellsandt等^[10]	R410, R407C	9.53	沸腾压降	-2.2～9.5, -5.5～13.8	0.1～44	162～415
Han等^[11]	R161	7	沸腾压降	-5～8	28.15～49.29	100～250
Nidegger等^[12]	R134a/oil	11.9	沸腾压降	入口343kPa	5～10	100～300
Ding等^[13]	R410A/oil	5	沸腾压降	5	7.65～15.12	250～400
Baba等^[14]	R1234ze(E)/R32	5.21	沸腾压降	10	—	150～400
吴昊等^[15]	CO₂	1, 2, 3	干涸特性	-10～10	2～35	50～1350
Mancin等^[16]	R134A	3.4	沸腾压降	30	10～50	190～755
陆至羚等^[17]	CO₂	1, 2, 3	干涸特性	-10～15	2～34	50～1350
Lee等^[18]	R290, R600a, R134a	10.07, 7.73, 6.54, 5.80	冷凝压降	40	—	35.5～210.4
Hossain等^[19]	R1234ze(E), R32, R410A	4.35	冷凝压降	35～45	11～44	140～400
Huang等^[20]	R134a/oil	4, 5	冷凝压降	40	4.21～8.42	200～500

结构参数	数值
螺纹数	38
螺旋角β/(°)	18
齿顶角α/(°)	40
底壁厚T _w/mm	0.20
齿高H _f/mm	0.14

结构参数	数值
螺纹数	38
螺旋角β/(°)	18
齿顶角α/(°)	40
底壁厚T _w/mm	0.20
齿高H _f/mm	0.14

测试参数	测试范围
质量流速/kg·m^-2·s^-1	200～500
热通量/kW·m^-2	5～25
测试干度	0.1～0.9
饱和温度/℃	0