-
It has been reported that the thermal conductivity of the nanofluids can be enhanced by adding Janus nanoparticles into the base fluid. Additionally, the non-spherical nanoparticles also affect the thermal characteristics of nanofluids. In this paper, conical nanoparticles are designed as Janus nanoparticles with hydrophilic side and hydrophobic bottom, which are suspended in the base fluid to form cone-shaped Janus nanofluids. By using molecular dynamics (MD) simulations, it is found that the thermal conductivity of conical Janus nanofluids can be enhanced by 43.4% compared to the base fluid, whereas the spherical Janus nanofluids demonstrate an increase of 33.7% under the same volume fraction. According to MD simulation results of the RDF and diffusion coefficients of solid particle and base fluid, the increased thermal conductivity observed in conical nanofluids can be attributed to the higher liquid layer density and the enhanced Brownian motion of the conical particles. For Janus nanofluids, the asymmetrical structure of Janus nanoparticles leads to higher diffusion coefficient compared to normal particles, which enhances the colliding possibility of Janus nanoparticles with surrounding liquid molecules and results in enhanced heat transfer in Janus nanofluids. This paper considered both fixed and unfixed particles to explore the impact of particle diffusion on nanofluids. Under the fixed condition, the Brownian motion of the nanoparticles is artificially excluded, while under the unfixed condition, the particle can diffuse in the base liquid. It is found that for both spherical and conical Janus nanofluids, the thermal conductivity of Janus nanofluids exhabits a gradual increase with rising asymmetry parameter δ under unfixed conditions. However, under fixed conditions, the thermal conductivity of Janus nanofluids is almost independent of the parameter δ. Therefore, the enhanced Brownian motion of the non-spherical particles is likely the cause of the increased thermal conductivity observed in conical Janus nanofluids. The combination of non-spherical particles and Janus particles provides a promising idea for the design of nanofluids with high thermal conductivity.
-
Keywords:
- nanofluids /
- non-spherical particles /
- Janus particles /
- thermal conductivity /
- molecular dynamics simulation
-
[1] Wang X F, Ren X X, Qiu C, Cao Y F, Taleb T, Leung V C M 2021 IEEE Netw. 35 280
[2] Liu M S, Lin M C, Tsai C Y, Wang C C 2006 Int. J. Heat Mass Transf. 49 3028
[3] Choi S U S, Zhang Z G, Yu W, Lockwood F E, Grulke E A 2001 Appl. Phys. Lett. 79 2252
[4] Han X F, Lu L W, Yan S Y, Yang X H, Tian R, Zhao X Y 2021 J. Therm. Sci. 30 1581
[5] Xuan Y M, Li Q 2000 Int. J. Heat Mass Transf. 21 58
[6] Liu B, Liang W H, Luo Z M, Sarvar S, Fereidooni L, Kasaeian A 2024 Mol. Liq. 414 126052
[7] Xuan Y M, Duan H L, Li Q 2014 RSC Adv. 4 16206
[8] Rapp B, Hussam A 2023 J. Appl. Phys. 133 134302
[9] Dai J H, Zhai Y L, Li Z H, Wang H 2024 J. Mol. Liq. 400 124518
[10] Yu W, Choi S U S 2004 J. Nanopart. Res. 6 355
[11] Qi K, Zhu X G, Wang J, Xia G D 2024 Acta Phys. Sin. 73 156801 (in Chinese) [齐凯, 朱星光, 王军，夏国栋 2024 物理学报 73 156801]
[12] Liu W W, Cui J, Wang J 2023 Phys. Fluids. 35 032004
[13] Xue L, Keblinski P, Phillpot S R, Choi S U S, Eastman J A 2004 Int. J. Heat Mass Transf. 47 4277
[14] Zhang Z Q, Qian S, Wang R J, Zhu Z F 2019 Acta Phys. Sin. 68 054401 (in Chinese) [张智奇, 钱胜, 王瑞金, 朱泽飞 2019 物理学报 68 054401]
[15] Karthik V, Sahoo S, Pabi S K, Ghosh S 2013 Int. J. Therm. Sci. 64 53
[16] Liu W W, Zhang K X, Wang J, Xia G D 2024 Acta Phys. Sin. 73 075101 (in Chinese) [刘旺旺, 张克学, 王军, 夏国栋 2024 物理学报 73 075101]
[17] Wang R J, Qian S, Zhang Z Q 2018 Int. J. Heat Mass Transf. 127 1138
[18] Dolatabadi N, Rahmani R, Rahnejat H, Garner C P 2019 RSC Adv. 9 2516
[19] Roni M R H, Shahadat M R B, Morshed A M M 2021 Micro Nano Lett. 16 221
[20] Li L, Zhang Y W, Ma H B, Yang M 2010 J. Nanopart. Res. 12 811
[21] Sarkar S, Selvam R P 2007 J. Appl. Phys. 102 074302
[22] Du J Y, Su Q M, Li L, Wang R J, Zhu Z F 2021 Int. Commun. Heat Mass Transf. 127 105501
[23] Pang C W, Jung J, Kang Y T 2014 Int. J. Heat Mass Transf. 72 392
[24] Zhou L, Zhu J W, Zhao Y F, Ma H H 2022 Int. J. Heat Mass Transf. 183 122124
[25] Wang X W, Xu X F, Choi S U S 1999 J. Thermophys. Heat Transf. 13 474
[26] Cui W Z, Shen Z J, Yang J G, Wu S H, Bai M L 2014 RSC Adv. 4 55580
[27] Zhu D H, Yu W, Zhu G H, Zhang Y C, Xie H Q 2020 Chin. Sci. Bull. 65 222 (in Chinese) [朱大海, 于伟, 朱桂华, 张迎春, 谢华清 2020 科学通报 65 222]
[28] Wang J, Cui X, Xia G D 2023 J. Beijing Univ. Technol. 49 1116 (in Chinese) [王军, 崔鑫, 夏国栋 2023 北京工业大学学报 49 1116]
[29] Li D, Hong B Y, Fang W J, Guo Y S, Lin R S 2010 Ind. Eng. Chem. Res. 49 1697
[30] Murshed S M S, Leong K C, Yang C 2005 Int. J. Therm. Sci. 44 367
[31] Li K R, Wang J, Xia G D 2025 Acta Phys. Sin. 74 064701 (in Chinese) [李康睿, 王军, 夏国栋 2025 物理学报 74 064701]
[32] Yu L Y, Liu D, Botz F 2012 Exp. Therm. Fluid Sci. 37 72
[33] Hou Q W, Cao B Y, Guo Z Y 2009 Acta Phys. Sin. 58 7809 (in Chinese) [侯泉文, 曹炳阳, 过增元 2009 物理学报 58 7809]
[34] Jabbari F, Rajabpour A, Saedodin S 2021 Microfluid. Nanofluid. 25 102
[35] Zhang L Y, Yu Wei, Zhu D H, Xie H Q, Huang G W 2017 J. Nanomater. 2017 5802016
[36] Cui X, Wang J, Xia G D 2022 Nanoscale. 14 99
[37] Kobayashi Y, Arai N 2019 J. Electrochem. Soc. 166 B3223
[38] Hong L, Jiang S, Granick S 2006 Langmuir. 22 9495
[39] Zhao H, Liang F X, Qu X Z, Wang Q, Yang Z Z 2015 Macromolecules. 48 700
[40] Rudyak V Y, Krasnolutskii S L 2017 Tech. Phys. 62 1456
[41] Huang J, Sang L X, Yang Q F, Wu Y T 2024 Sol. Energy Mater. Sol. Cells. 277 113150
[42] Koo J, Kleinstreuer C 2004 J. Nanopart. Res. 6 577
[43] Naghizadeh J, Rice S A 1962 J. Chem. Phys. 36 2710
Metrics
- Abstract views: 41
- PDF Downloads: 0
- Cited By: 0
下载:
