粗糙纳通道内流体流动与传热的分子动力学模拟研究

张程宾; 许兆林; 陈永平

doi:10.7498/aps.63.214706

摘要

为研究粗糙表面对纳尺度流体流动和传热及其流固界面速度滑移与温度阶跃的影响,本文建立了粗糙纳通道内流体流动和传热耦合过程的分子动力学模型,模拟研究了粗糙通道内流体的微观结构、速度和温度分布、速度滑移和温度阶跃并与光滑通道进行了比较,并分析了固液相互作用强度和壁面刚度对界面处速度滑移和温度阶跃的影响规律. 研究结果表明,在外力作用下,纳通道主流区域的速度分布呈抛物线分布,由于流体流动导致的黏性耗散使得纳通道内的温度分布呈四次方分布. 并且,在固体壁面处存在速度滑移与温度阶跃. 表面粗糙度的存在使得流体剪切流动产生了额外的黏性耗散,使得粗糙纳通道内的流体速度水平小于光滑通道,温度水平高于光滑通道,并且粗糙表面的速度滑移与温度阶跃均小于光滑通道. 另外,固液相互作用强度的增大和壁面刚度的减小均可导致界面处速度滑移和温度阶跃程度降低.

关键词:

Abstract

Fluid flow and heat transfer in a microstructure may depart from the traditional behavior due to the scale effect, and its velocity slip and temperature jump will occur at the fluid-solid interface. A molecular dynamics model of coupled fluid flow and heat transfer in rough nanochannels is developed to investigate the effect of surface roughness on nanoscale fluid flow and heat transfer, as well as velocity slip and temperature jump at the fluid-solid interface. The fluid microscopic structure, velocity and temperature distributions, interfacial velocity slip and temperature jump in a rough nanochannel are evaluated and compared with the corresponding smooth nanochannel. Effects of solid-liquid interaction and wall stiffness on the velocity slip and temperature jump are analyzed. Results indicate that the velocity of the fluid flow under an external force in a nanochannel in a bulk region is of a parabolic distribution, and the viscous dissipation due to shear flow induces the fourth-order temperature profile in the nanochannel. And the velocity slip and temperature jump will occur at the fluid-solid interface. The presence of roughness may introduce an extra viscous dissipation in shear flow, leading to a reduction of overall velocity and an increase in temperature in the nanochannel when compared with the smooth nanochannel. In addition, the degree of velocity slip and temperature jump at a rough liquid-solid interface is smaller than that at a smooth interface. In particular, the increase in fluid-solid interaction strength and reduction in wall stiffness will lead to a small velocity slip and temperature jump.

Keywords:

作者及机构信息

1.
能源热转换及其过程测控教育部重点实验室, 东南大学能源与环境学院, 南京 210096

基金项目: 国家自然科学基金(批准号:11190015,51306033)资助的课题.

Authors and contacts

1.
Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11190015, 51306033).

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施引文献

[1]	Darhuber A A, Troian S M 2005 Annu. Rev. Fluid Mech. 37 425
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[5]	Akhmatskaya B, Todd D, Daivis P J, Evans D J, Gubbins, K E, Pozhar L A 1997 J. Chem. Phys. 106 4684
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[7]	Megahed A M 2013 Chin. Phys. B 22 094701
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[9]	Sun D K, Xiang N, Jiang D, Chen K, Yi H, Ni Z H 2013 Chin. Phys. B 22 114704
[10]	Chen Y Y, Yi H H, Li H B 2008 Chin. Phys. Lett. 25 184
[11]
[12]
[13]	Huang Q G, Pan G, Song B W 2014 Acta Phys. Sin. 63 054701 (in Chinese) [黄桥高, 潘光, 宋保维 2014 63 054701]
[14]	Chen Y P, Zhang C B, Shi M H, Peterson G P 2012 Appl. Phys. Lett. 100 074102
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[16]
[17]	Yan H, Zhang W M, Hu K M, Liu Y, Meng G 2013 Acta Phys. Sin. 62 174701 (in Chinese) [闫寒, 张文明, 胡开明, 刘岩, 孟光 2013 62 174701]
[18]
[19]	Xie H, Liu C, Liu B W 2009 Acta Phys.-Chim. Sin. 25 994 (in Chinese) [解辉, 刘朝, 刘彬武 2009 物理化学学报 25 994]
[20]
[21]	Ohara T, Torii D 2005 J. Chem. Phys. 122 214717
[22]
[23]	Thompson P A, Troian S M 1997 Nature 389 360
[24]	Cieplak M, Koplik J, Banavar J R 2001 Phys. Rev. L 86 803
[25]
[26]	Barrat J L, Bocquet L 1999 Phys. Rev. L 82 4671
[27]
[28]
[29]	Pahlavan A A, Freund J B 2011 Phys. Rev. E 83 021602
[30]	Nagayama G, Cheng P 2004 Int. J. Heat Mass Transf. 47 501
[31]
[32]
[33]	Kim B H, Beskok A, Cagin T 2008 Microfluid Nanofluid 5 551
[34]
[35]	Liu C, Fan H B, Zhang K, Yuen M M F, Li Z G 2010 J. Chem. Phys. 132 094703
[36]	Sun J, Wang W, Wang H S 2013 J. Chem. Phys. 138 234703
[37]
[38]	Sun J, Wang W, Wang H S 2013 Phys. Rev. E 87 023020
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[43]
[44]	Li Z G 2009 Phys. Rev. E 79 026312
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[47]	Soong C Y, Yen T H, Tzeng P Y 2007 Phys. Rev. E 76 036303
[48]	Niavarani A, Priezjev N V 2008 J. Chem. Phys. 129 144902
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[50]
[51]	Sofos F D, Karakasidis T E, Liakopoulos A 2009 Phys. Rev. E 79 026305
[52]	Yang S C 2006 Microfluid Nanofluid 2 501
[53]
[54]	Schmatko T, Hervet H, Leger L 2006 Langmuir 22 6843
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[56]	Wang Y, Keblinski P 2011 Appl. Phys. Lett. 99 073112
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