| Surface wave instability in the thermocapillary migration of a flat droplet | |
Hu, KaiXin ; Zhang, ShaoNeng; Chen QS(陈启生)
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| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2023-03-03 | |
| Volume | 958Pages:A22 |
| ISSN | 0022-1120 |
| Abstract | The surface wave instability (SWI) of thermocapillary migration is examined by linear stability analysis for a droplet on a unidirectional heated plane. Both a Newtonian fluid and an Oldroyd B fluid are considered. The droplet, flattened by gravity, is susceptible to two kinds of instabilities: convective instability (CI), which is independent of surface deformation; and SWI, which occurs only when the Galileo number and the surface tension number are not too large. The wavenumber of the latter is much smaller than that of the former, while the reverse is true for the wave speed. SWI is found at different Prandtl numbers (Pr), while its mode includes streamwise and oblique waves. Energy analysis suggests that the energy of the long wave mode comes from the shear stress induced by the surface deformation, the energy source for the mode with finite wavelength is the work done by Marangoni forces, while the energy from the basic flow is only important in some cases at small Pr. For the Oldroyd B fluid, a small elasticity slightly changes the critical Marangoni number of SWI, while larger elasticity changes the preferred mode from SWI to CI. The instability mechanism is discussed and comparisons are made with experimental results. |
| Keyword | thermocapillarity shear flow instability thin films |
| DOI | 10.1017/jfm.2023.77 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000943045700001 |
| WOS Research Area | Mechanics ; Physics, Fluids & Plasmas |
| WOS Subject | Mechanics ; Physics |
| Funding Organization | National Natural Science Foundation of China [11872032, 11832013, 11772344] ; Zhejiang Provincial Natural Science Foundation [LY21A020006] ; Key Research and Development Plan of Ningbo [2022Z213] ; K.C. Wong Magna Fund in Ningbo University |
| Classification | 一类/力学重要期刊 |
| Ranking | 3+ |
| Contributor | Hu, KX (corresponding author), Ningbo Univ, Fac Mech Engn & Mech, Zhejiang Prov Engn Res Ctr Safety Pressure Vessels, Ningbo 315211, Zhejiang, Peoples R China. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/91812 |
| Collection | 微重力重点实验室 |
| Affiliation | 1.Ningbo Univ, Fac Mech Engn & Mech, Zhejiang Prov Engn Res Ctr Safety Pressure Vessels, Ningbo 315211, Zhejiang, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China |
| Recommended Citation GB/T 7714 | Hu, KaiXin,Zhang, ShaoNeng,Chen QS. Surface wave instability in the thermocapillary migration of a flat droplet[J]. JOURNAL OF FLUID MECHANICS,2023,958:A22.Rp_Au:Hu, KX (corresponding author), Ningbo Univ, Fac Mech Engn & Mech, Zhejiang Prov Engn Res Ctr Safety Pressure Vessels, Ningbo 315211, Zhejiang, Peoples R China. |
| APA | Hu, KaiXin,Zhang, ShaoNeng,&陈启生.(2023).Surface wave instability in the thermocapillary migration of a flat droplet.JOURNAL OF FLUID MECHANICS,958,A22. |
| MLA | Hu, KaiXin,et al."Surface wave instability in the thermocapillary migration of a flat droplet".JOURNAL OF FLUID MECHANICS 958(2023):A22. |
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| File Name/Size | DocType | Version | Access | License | ||
| Jp2023A031.pdf（949KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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