Numerical Study on Deposition Characteristics of a Droplet Impinging onto Spherical Surface with Low Impact Energy

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Numerical Study on Deposition Characteristics of a Droplet Impinging onto Spherical Surface with Low Impact Energy

更新时间：2025-07-09

- Numerical Study on Deposition Characteristics of a Droplet Impinging onto Spherical Surface with Low Impact Energy
- Vol. 43, Issue 7, Pages: 21-24(2009)
- 作者机构：
  
  长安大学环境科学与工程学院,西安,710064
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Online First：10 July 2009，
  
  Published：2009
- 稿件说明：
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Numerical Study on Deposition Characteristics of a Droplet Impinging onto Spherical Surface with Low Impact Energy[J]. 2009, 43(7): 21-24.
DOI：

Numerical Study on Deposition Characteristics of a Droplet Impinging onto Spherical Surface with Low Impact Energy[J]. 2009, 43(7): 21-24. DOI：

摘要

将水平集方法与浸没边界法相结合

发展了一个在固定欧拉网格系统中的直接数值模拟方法

对韦伯数在5～100、雷诺数在10～150以内的低冲击能量液滴正向撞击球面的过程进行了三维直接数值模拟

重点研究了液滴的冲击速度与球面曲率半径对液滴沉积行为的影响.模拟结果表明

在低冲击能量下

正向冲击液滴在球面上呈现出铺展、回缩、再铺展、再回缩

直至沉积在球面上的特征.在沉积过程中

液滴的铺展速率与铺展面积随着撞击速度的增大而增大

液滴的铺展面积随着球面曲率半径的增大而减小.液滴在沉积过程的首次回缩阶段

出现中心局部破裂现象.为了定量研究该现象

建立了局部破裂与韦伯数以及球面曲率半径之间的关系图谱.

Abstract

The three-dimensional direct numerical simulation is performed to study the deposition behavior of a liquid droplet with low impact energy impinging on a spherical surface. The numerical approach is presented by the combination of the level set and the immersed boundary method. The pseudo single fluid model is used to compute the flow field within the droplet and the surrounding gas phase. The level set technique is employed to capture the droplet deformation

and the immersed boundary method with a modified direct forcing scheme is proposed to treat the curved solid boundary in fluid with a fixed Cartesian mesh. The effects of impact velocity and curvature radius of spherical surface are investigated on the deposition behavior of a droplet with the Weber number of 5-100 and the Reynolds number of 10-150. The results show that the droplet with low impact energy undergoes spreading

recoiling

weak re-spreading

weak re-recoiling and ultimately depositing on the spherical surface. Moreover

the spreading rate and the spreading area increase with the increase in impact velocity at the early stage of the droplet deposition while the spreading area decreases with the increase in the curvature radius of spherical surface. In addition

a local breakage occurs at the center of the droplet collision with a spherical surface during the first recoiling stage. The breakage regime map of the relation between the local breakage and the curvature radius of spherical surface is also established.

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references

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FUKAI J, SHIIBA Y, YAMAMOTO T, et al. Wetting effects on the spreading of a liquid droplet colliding with a flat surface: experiment and modeling [J]. Phys Fluids, 1995,7(2): 236-247.

BUSSMANN M, MOSTAGHIMI J, CHANDRA S. On a three-dimensional volume tracking model of droplet impact [J]. Phys Fluids, 1999, 11(6): 1406-1417.

BUSSMANN M, CHANDRA S, MOSTAGHIMI J. Modeling the splash of a droplet impacting a solid surface [J]. Phys Fluids, 2000, 12(12): 3121-3132.

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李彦鹏, 王焕然. 带内嵌固体的不可压缩气液两相界面流数值模拟方法 [J]. 西安交通大学学报, 2008, 42(9): 1151-1155.

LI Yanpeng, WANG Huanran. Numerical simulation method for incompressible gas-liquid two-phase interfacial flows with immersed solid boundaries [J]. J of Xi'an Jiaotong University, 2008, 42(9): 1151-1155.

GE Y, FAN L S. Droplet-particle collision mechanics with film-boiling evaporation [J]. J Fluid Mech, 2007, 573(2): 311-337.

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