Enhanced pool boiling heat transfer on soft liquid metal surface

Cao Chun-Lei; He Xiao-Tian; Ma Xiao-Jing; Xu Jin-Liang

doi:10.7498/aps.70.20202053

Abstract

Pool boiling is a high-efficient energy transfer method through the gas-liquid phase transition. It has the characteristics of small heat transfer temperature difference and high heat flux density. The current enhancement of boiling heat transfer is realized mainly through modifying the solid heating surface. So far, there has been no report on the study of pool boiling heat transfer on soft surfaces. Therefore, in this work the pool boiling heat transfer performances of ethanol on the copper surface and soft liquid metal surface are investigated experimentally. The experimental results indicate that soft surface can effectively reduce the wall superheat corresponding to the onset of boiling (ONB). In saturation boiling, the superheat of the wall surface at ONB is reduced by nearly 12 ℃, while the heat transfer coefficient is improved by 149%. It is found that soft surface enhances pool boiling heat transfer performance significantly by increasing nucleate site density, reducing the bubble departure diameter, and increasing bubble departure frequency. Unlike the copper surface, the soft surface deforms elastically under the action of the vertical component of surface tension γ_lvsinθ at the three-phase contact line of the vapor bubble. From the perspective of surface energy analysis, the difference in surface energy ΔE_LM between before and after bubble departure on soft liquid metal surface is smaller than in smooth surface ΔE_CS. The potential barrier of the soft surface is smaller than of the copper surface, and the buoyancy required for bubble separation is small, and the bubble is easy to separate. Elastocapillary wave and bubble jet phenomenon on the soft surface are observed particularly, which are generated on liquid metal under the action of elastic restoring force. The fluctuation of elastocapillary wave contributes to the enhancement of heat and mass transfer in thermal boundary layer and the generation of residual nucleation site. The residual bubble grows up rapidly and coalesces with the rising large bubble, forming bubble jet phenomenon. Elastocapillary wave and bubble jet contribute to the enhancement of pool boiling heat transfer on soft liquid metal surface.

Keywords:

Authors and contacts

1.
Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China
2.
Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

Corresponding author: Ma Xiao-Jing, mxj@ncepu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51821004)

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References

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Cited By

图 1 (a)池沸腾实验装置. 1: Ga₆₇In_20.5Sn_12.5; 2: 冷凝盘管; 3: 高速相机; 4: 功率计; 5: 调压器; 6: Agilent 34970A; 7: 恒温水箱; 8: 充液口; 9: K型热电偶; 10: 压力表; 11: 风冷冷凝器; 12: 辅助加热器; 13: 聚四氟乙烯; 14: 紫铜块. (b)紫铜块尺寸(所有尺寸均以mm为单位)

Figure 1. (a) Pool boiling experiment setup. 1: Ga₆₇In_20.5Sn_12.5; 2: coiled-tube; 3: high-speed camera; 4: power meter; 5: voltage transformer; 6: Agilent 34970A; 7: constant temperature water bath; 8: filling port; 9: K thermocouple; 10: pressure gauge; 11: air-cooled condenser; 12: auxiliary heater; 13: teflon; 14: copper block. (b) Copper block size (all dimensions are in mm).

DownLoad: Full-Size Img PowerPoint

图 2 样品的接触角测量和扫描电镜图像　(a)抛光紫铜表面; (b)液态金属软表面

Figure 2. Contact angle measurement and scanning electron microscope image of the sample: (a) Polished copper surface; (b) Soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

图 3 液温78, 60和40 ℃条件下, 光滑铜表面和液态金属软表面的　(a)沸腾曲线, (b)传热系数曲线和(c)强化因子曲线

Figure 3. (a) Boiling curve, (b) heat transfer coefficient curve and(c) Heat transfer enhancement factor of smooth copper surface and soft liquid metal surface at 78, 60 and 40 ℃.

DownLoad: Full-Size Img PowerPoint

图 4 低热流密度下池沸腾可视化图像　(a)光滑铜表面(ΔT = 16.9 ℃, q = 3.46 W/cm²); (b)液态金属软表面(ΔT = 6.8 ℃, q = 3.47 W/cm²)

Figure 4. Visualization images of pool boiling at low heat flux: (a) Smooth copper surface (ΔT = 16.9 ℃, q = 3.46 W/cm²); (b) Soft liquid metal surface (ΔT = 6.8 ℃, q = 3.47 W/cm²).

DownLoad: Full-Size Img PowerPoint

图 5 中等热流密度下池沸腾可视化图像　(a)—(c)光滑铜表面; (d)—(f)液态金属软表面

Figure 5. Visualization images of pool boiling at medium heat flux: (a)–(c) Smooth copper surface and (d)–(f) Soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

图 6 高热流密度下池沸腾可视化图像　(a)光滑铜表面; (b)液态金属软表面

Figure 6. Visualized images of pool boiling at high heat flux: (a) Smooth copper surface; (b) Soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

图 7 液态金属软表面弹性毛细波和汽泡射流现象(ΔT = 7.49 ℃, q = 4.74 W/cm²)

Figure 7. Elastocapillary wave and bubble jet phenomena on soft liquid metal surface (ΔT = 7.49 ℃, q = 4.74 W/cm²).

DownLoad: Full-Size Img PowerPoint

图 8 液态金属软表面弹性毛细波和汽泡射流现象机理(ΔT = 7.49 ℃, q = 4.74 W/cm²)

Figure 8. Mechanism of soft surface elastocapillary wave and bubble jet phenomenon on soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

图 9 液态金属软表面汽泡更易脱离机理

Figure 9. Mechanism of easier detachment of bubbles on soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

图 10 液态金属软表面强化沸腾传热机理

Figure 10. Mechanism of boiling heat transfer enhancement on soft liquid metal surface.

DownLoad: Full-Size Img PowerPoint

表 1 乙醇的物性参数(20 ℃, 101.325 kPa)

Table 1. Physical parameters of ethanol (20 ℃, 101.325 kPa).

	T_s/℃	ρ/(kg·m^–3)	h_fg/(kJ·kg^–1)	c_pl/(kJ·kg^–1·K^–1)	λ/(W·m^–1·K^–1)	ν/(10^-6m²·s^–1)	μ/(10^-3Pa·s)	σ/(10^-3N·m^–1)	Pr
液体	78.23	789.42	—	2.40	0.16	1.507	1.19	22.3	17.39
蒸汽	78.23	1.65	849.63	1.72	0.02	6.061	0.010	—	0.861

DownLoad: CSV

表 2 液态金属Galinstan (Ga₆₇In_20.5Sn_12.5)与水物性参数对比(20 ℃, 101.325 kPa)

Table 2. Physical properties of liquid metal Galinstan (Ga₆₇In_20.5Sn_12.5) and water at 20 ℃ and 101.325 kPa.

流体	ρ/(kg·m^–3)	T_m/℃	T_s/℃	h_fg/(kJ·kg^–1)	c_pl/(J·kg^–1·K^–1)	λ/(W·m^–1·K^–1)	μ/(10^-3Pa·s)	σ/(10^-3N·m^–1)	Pr
水	998	0	100	2256.47	4184	0.6	1.002	72.8	7.008
Galinstan	6440	10.5	> 1300	24.00	366	16.5	2.400	533.0	0.053

DownLoad: CSV

[1]	曹泷, 杨辉, 吴学红, 周振华 2020 微纳电子技术 57 982 Cao S, Yang H, Wu X H, Zhou Z H 2020 Micronanoelectronic Technology 57 982
[2]	Mori S, Utaka Y 2017 Int. J. Heat Mass Transfer 108 2534 Google Scholar
[3]	Kong X, Zhang Y, Wei J 2018 Exp. Therm. Fluid Sci. 91 9 Google Scholar
[4]	Liang G, Mudawar I 2019 Int. J. Heat Mass Transfer 128 892 Google Scholar
[5]	Gregorcic P, Zupancic M, Golobic I 2018 Sci. Rep. 8 7461 Google Scholar
[6]	余雄江, 袁金斗, 王彦博, 徐进良 2018 化工进展 37 3751 Yu X J, Yuan J D, WangY B, Xu J L 2018 Chem. Ind. Eng. Prog. 37 3751
[7]	Lu M C, Huang C H, Huang C T, Chen Y C 2015 Int. J. Therm. Sci. 91 133 Google Scholar
[8]	Xu Z G, Zhao C Y 2016 Appl. Therm. Eng. 100 68 Google Scholar
[9]	Ryohachi, Shimada, Jun, Komai, Yoichi, Hirono, Satoshi 1991 Exp. Therm. Fluid Sci.
[10]	Xu J, Ji X, Zhang W, Liu G 2008 Int. J. Multiphase Flow 34 1008 Google Scholar
[11]	Jaikumar A, Kandlikar S G 2017 Sci. Rep. 7 15691 Google Scholar
[12]	郑晓欢, 纪献兵, 王野, 徐进良, 黄彦平, 李勇 2017 核动力工程 038 179 Zheng X H, Ji X B, Wang Y, Xu J L, Huang Y P, Li Y 2017 Nuclear Power Engineering 038 179
[13]	An S, Kim D Y, Lee J G, Jo H S, Kim M W, Al-Deyab S S, Choi J, Yoon S S 2016 Int. J. Heat Mass Transfer 98 124 Google Scholar
[14]	Surtaev A, Kuznetsov D, Serdyukov V, Pavlenko A, Kalita V, Komlev D, Ivannikov A, Radyuk A 2018 Appl. Therm. Eng. 133 532 Google Scholar
[15]	Son H H, Seo G H, Jeong U, Shin D Y, Kim S J 2017 Int. J. Heat Mass Transfer 113 115 Google Scholar
[16]	Rishi A M, Kandlikar S G, Gupta A 2019 Int. J. Heat Mass Transfer 132 462 Google Scholar
[17]	Mao L, Zhou W, Hu X, He Y, Zhang G, Zhang L, Fu R 2020 Int. J. Therm. Sci. 147 106154 Google Scholar
[18]	Yim K, Lee J, Naccarato B, Kim K J 2019 Int. J. Heat Mass Transfer 133 352 Google Scholar
[19]	Lee Y C, Hossain Bhuiya M M, Kim K J 2010 Int. J. Heat Mass Transfer 53 4274 Google Scholar
[20]	Ramaswamy C, Joshi Y, Nakayama W, Johnson W B 2002 Int. J. Heat Mass Transfer 45 4761 Google Scholar
[21]	Park S J, Weon B M, Lee J S, Lee J, Kim J, Je J H 2014 Nat. Commun. 5 4369 Google Scholar
[22]	Desai P R, Wang Y, Sachar H S, Jing H, Sinha S, Das S 2019 Matter 1 1262 Google Scholar
[23]	Lopes M C, Bonaccurso E 2012 Soft Matter 8 7875 Google Scholar
[24]	Sokuler M, Auernhammer G K, Roth M, Liu C, Bonacurrso E, Butt H J 2010 Langmuir 26 1544 Google Scholar
[25]	Narhe R, Anand S, Rykaczewski K, Medici M-G, González-Viñas W, Varanasi K K, Beysens D 2015 Langmuir 31 5353 Google Scholar
[26]	Petit J, Bonaccurso E 2014 Langmuir 30 1160 Google Scholar
[27]	Carré A, Shanahan M E R 2001 Langmuir 17 2982 Google Scholar
[28]	Shanahan M E R, Carre A 1995 Langmuir 11 1396 Google Scholar
[29]	Weisensee P B, Tian J, Miljkovic N, King W P 2016 Sci. Rep. 6 30328 Google Scholar
[30]	Mangili S, Antonini C, Marengo M, Amirfazli A 2012 Soft Matter 8 10045 Google Scholar
[31]	Young T 1805 Philos. Trans. R. Soc. London 95 65 Google Scholar
[32]	Yu Y S 2012 Appl. Math. Mech. 33 1095 Google Scholar
[33]	Weijs J H, Andreotti B, Snoeijer J H 2013 Soft Matter 9 8494 Google Scholar
[34]	Rykaczewski K, Phadnis A 2018 Nanoscale Microscale Thermophys. Eng. 22 230 Google Scholar
[35]	杨小虎, 刘静 2018 科技导报 36 54 Yang X H, Liu J 2018 Science & Technology Review 36 54
[36]	Jaikumar A, Kandlikar S G 2015 Int. J. Heat Mass Tranfer 88 652 Google Scholar
[37]	Liu T, Sen P, Kim C J 2012 J. Microelectromech. Syst. 21 443 Google Scholar
[38]	Dickey M D 2014 ACS Appl. Mater Interfaces 6 18369 Google Scholar
[39]	Xu Q, Oudalov N, Guo Q, Jaeger H M, Brown E 2012 Phys. Fluids 24 063101 Google Scholar
[40]	Shanahan M E R, Carré A 2002 Colloids Surf., A 206 115 Google Scholar
[41]	Jacob A R, Parekh D P, Dickey M D, Hsiao L C 2019 Langmuir 35 11774 Google Scholar
[42]	林瑞泰 1988 沸腾换热 (北京: 科学出版社) 第112页 Lin R T 1988 Boiling Heat Transfer (Beijing: Science Press) (in Chinese) p112
[43]	Tien C J 1962 Int. J. Heat Mass Transfer 5 533 Google Scholar

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