Numerical and visualization study on dynamic behavior of bubbles in anti-acceleration double tangent arc channel

doi:10.11949/0438-1157.20240141

Abstract

Abstract:

The design of heat dissipation system of airborne electronic equipment is of great significance to the long-flight safe operation of aircraft. An acceleration-resistant double tangent arc flow channel was designed. Numerical analysis based on VOF multiphase flow model and visualization based on high-speed camera were carried out for the dynamic behavior of bubbles in the flow channel. The simulation analysis shows that, compared with the straight channel, the bubbles in the double tangent channel break into small bubbles and are thrown away from the heating surface due to the centrifugal force, which makes the vapor-liquid separation. The tangent arc channel with 30° has the weakest separation ability, but the bubbles remaining on the wall are the least. The separation ability of 60° tangent channel is the strongest, but the bubbles on the wall are not easy to flow. The visualization experiment of 45° tangent channel is carried out, and the visualization results are consistent with the simulation analysis. The simulation results show that when the velocity is 1 m/s, the 45° double tangent channel can effectively resist the acceleration of 5g.

Key words: bubble, centrifugation, two-phase flow, hydrodynamics, visualization

摘要：

机载电子设备的散热系统设计对飞行器的长航时安全运行具有重要意义。设计了抗加速度的双切线弧流道，针对流道内的气泡动力学行为，开展了基于VOF多相流模型的数值分析与基于高速相机的可视化研究。仿真分析表明，相比于直流道，双切线弧流道中的气泡在流经弯管时，由于离心力的作用，会破裂成小气泡并被甩到远离加热面的位置，使得气液分离。30°双切线弧流道分离能力最弱，但残留在壁面的气泡最少；60°双切线弧流道分离能力最强，但壁面处气泡不易流动。对45°双切线弧流道进行了可视化实验研究，可视化结果与仿真分析一致。仿真计算表明，当流速为1 m/s时，45°双切线弧流道可以有效抵抗5g的加速度。

关键词: 气泡, 离心分离, 两相流, 流体动力学, 可视化

CLC Number:

TQ 021.1

Hao TANG, Dinghua HU, Qiang LI, Xuanchang ZHANG, Junjie HAN. Numerical and visualization study on dynamic behavior of bubbles in anti-acceleration double tangent arc channel[J]. CIESC Journal, 2024, 75(9): 3074-3082.

唐昊, 胡定华, 李强, 张轩畅, 韩俊杰. 抗加速度双切线弧流道内气泡动力学行为数值与可视化研究[J]. 化工学报, 2024, 75(9): 3074-3082.

Figures/Tables 16

Fig.1 Schematic of experimental loop

Fig.2 Schematic of test section

Table 1 HFE-7100 physical parameters

参数	数值
液相密度/(kg/m³)	1520
气相密度/(kg/m³)	9.7
比热容/（kJ/（kg·K))	1.1
热导率/（W/（m·K))	0.058
沸点/℃	61
潜热/(kJ/kg)	50

Fig.3 Physical model of straight channel and double tangent arc channel

Table 2 Grid independence verification

流道	网格数/个	气泡平均速度/(m/s)	误差/%
直流道	41720	1.078
	20656	1.041	3.41
	13676	0.976	9.46
	10944	0.989	8.25
30°双切线弧流道	44770	1.314
	23532	1.291	1.75
	16950	1.408	7.15
	11719	1.419	7.99
45°双切线弧流道	46718	1.415
	27351	1.461	3.25
	21796	1.497	5.79
	17641	1.512	6.86
60°双切线弧流道	61094	1.742
	33746	1.709	1.89
	25209	1.685	3.27
	18014	1.576	9.53

Fig.4 Grid division diagram of straight channel and double tangent arc channel

Fig.5 Single bubble flow characteristics

Fig.6 Force and movement path diagram of bubbles in straight channel and centrifugal channel

Fig.7 Vapor layer flow characteristics

Fig.8 Bubble flow characteristics in double tangent arc channels with different angles

Fig.9 Flow characteristics of bubbles in the channel when the heating power of dryness controller is 30 W

Fig.10 Flow characteristics of bubbles in the channel when the heating power of dryness controller is 200 W

Fig.11 Comparison between numerical calculation and visualization experiment of bubble movement in 45° double tangent arc channel

Fig.12 Comparison between numerical calculation and experimental results of average bubble velocity in double tangent arc channel

Fig.13 The position and shape of bubble at the end of channel under different acceleration

Fig.14 Volume fraction ratio of gas phase in the lower half/upper half of the flow channel at different accelerations

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