Abstract
In this approach, the numerical model of the fluid dynamics of liquid droplets impacting on the fabric surface with VOF method is proposed. The results obtained by the proposed model are well in agreement with the experimental results. The mechanism of the liquid droplet morphological evolution is investigated by pressure distribution and velocity vector, and the obvious bubble entrapment, which cannot be observed in experimenal results, is captured by the proposed model. The evolution laws of the spreading factor and the contact angle at the liquid-porous interface are obtained and the reason why the contact angle is dynamic is analyzed. The effects of droplet diameter and impact velocity on the fluid flow characteristics are also discussed. Usually, droplet diameter increasing leads more dramatic shape distortion of the liquid droplet, and impact velocity increasing leads shorter time to reach the maximum spreading stage. Finally, based on the properties of the impacting droplet by the proposed model, the important references of optimizing the parachute design for severe weather are built.
Highlights
The droplet impact can be very significant in various engineering applications, ranging from inkjet printing, engine washing, to aircraft icing [1,2,3,4]
Shen and Bi [5] studied the effects of several dimensionless parameters on the deformation of a droplet impacting on a 2D round surface by using lattice Boltzmann algorithm and revealed that initial impacting velocity plays a significant role in impact dynamic
In pressure field and velocity vector, the obvious bubble entrapment is captured, which cannot be observed in experimenal results [11]
Summary
The droplet impact can be very significant in various engineering applications, ranging from inkjet printing, engine washing, to aircraft icing [1,2,3,4]. The supercool droplet could even cause local icing to degrade the decelerating of parachute and reduce parachute success It is of great academic and engineering significance to study the droplet impacting on fabric surfaces. Reis [10] employed Finite Volume Method (FVM) to simulate the fluid dynamics of impacting droplet onto a porous medium. Choi and Son [13,14] employed the level-set (LS) method to track the droplet deformation and investigated the effects of initial droplet radius, impact velocity, contact angle and porosity on the droplet spreading and penetration in a porous medium. The numerical model of the fluid dynamics of liquid droplets impacting on the fabric surface with VOF method was proposed. The following assumption are made as: 1. the flow is axisymmetric, laminar and Newtonian fluid; 2. the properties of liquid, air and solid are constant during the numerical simulation
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