The use of liquid jets to simulate angled drop impact

Hand, Russell J.; Field, J. E.; Townsend, D. P.

doi:10.1063/1.349793

Cited by 50 publications

(30 citation statements)

References 14 publications

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“…These arguments are confirmed by the experimental and numerical results and are consistent with earlier work (as discussed below) on liquid impact in other contexts. Findings for both liquid drop and jet impact are relevant since the initial impact is similar in both cases, as noted by Hand, Field & Townsend (1991).…”

Section: The Nature Of Liquid Impactmentioning

confidence: 83%

The role of ‘splashing’ in the collapse of a laser-generated cavity near a rigid boundary

et al. 1999

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Vapour cavities in liquid flows have long been associated with cavitation damage to nearby solid surfaces and it is thought that the final stage of collapse, when a highspeed liquid jet threads the cavity, plays a vital role in this process. The present study investigates this aspect of the motion of laser-generated cavities in a quiescent liquid when the distance (or stand-off) of the point of inception from a rigid boundary is between 0.8 and 1.2 times the maximum radius of the cavity. Numerical simulations using a boundary integral method with an incompressible liquid impact model provide a framework for the interpretation of the experimental results. It is observed that, within the given interval of the stand-off parameter, the peak pressures measured on the boundary at the first collapse of a cavity attain a local minimum, while at the same time there is an increase in the duration of the pressure pulse. This contrasts with a monotonic increase in the peak pressures as the stand-off is reduced, when the cavity inception point is outside the stated interval. This phenomenon is shown to be due to a splash effect which follows the impact of the liquid jet. Three cases are chosen to typify the splash interaction with the free surface of the collapsing cavity: (i) surface reconnection around the liquid jet; (ii) splash impact at the base of the liquid jet; (iii) thin film splash. Hydrodynamic pressures generated following splash impact are found to be much greater than those produced by the jet impact. The combination of splash impact and the emission of shock waves, together with the subsequent re-expansion, drives the flow around the toroidal cavity producing a distinctive double pressure peak.

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Section: The Nature Of Liquid Impactmentioning

confidence: 83%

The role of ‘splashing’ in the collapse of a laser-generated cavity near a rigid boundary

et al. 1999

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“…The conditions of the erosion tests are listed in Table 3. The water jet was utilized to simulate drop impact based on a method outlined by Hand et al (1991). The velocity of the water jet was transformed into the velocity of a water drop with an equivalent diameter.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Calibration chart for a water jet with 0.8 mm diameter (afterHand et al, 1991). Ring crack structure in a brittle material impinged by a high-speed liquid drop.…”

mentioning

confidence: 99%

Deformation and fracture of rocks due to high-speed liquid impingement

Momber

2004

Int J Fract

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The paper reports on the deformation and fracture of four rock materials and two cementitious materials due to the impingement of simulated liquid drops at velocities up to 900 m/s. For hard materials, the damage appeared in the form of an undamaged central region surrounded by rings of discrete microcracks. The size of the undamaged zone corresponded to the theoretical contact diameter for low and medium impact velocities, whereas the outer ring size corresponded to the simulated drop diameter. For soft materials, crack formation was obliterated by features of plastic flow. An elastic-plastic transition criterion was derived to explain these different types of response. Crack ring diameter increased as impact velocity increased. However, for rather non-homogeneous materials this relationship was very weak. Failure due to lateral jetting could be noted and was found to contribute significantly to the damage. Material was removed by two different modes: 'drilling mode' and 'chipping mode', respectively. The first mode applied to soft and porous materials, namely limestone and sandstone, whereas the second mode applied to rather dense and brittle materials, namely granite and feldspar. List of Symbolsc = shock wave velocity d = diameter k = shock parameter p B = stagnation pressure p C = impact pressure r C = radius of contact r L = simulated drop radius t 1 = impact period t 2 = jetting period t P = compression (pulse) period v L = impact velocity v S = speed of sound ρ = density σ P = impact (pulse) stress Subscripts L = liquid M = target material 684 A.W. Momber

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“…According to Field [2], there is a relation between the diameter of the drop and the velocity for different impacts leading to the same degradation of an infrared material:…”

Section: Analysis Of the Distribution Of Droplets In A Natural Rainmentioning

confidence: 99%