Drop Breakup by Airstream Impact

reportActive / Technical Report | Accession Number: AD0666525 | Open PDF

Abstract:

The effects of an impulsively applied airstream on the breakup of a water droplet are examined analytically and experimentally. Scaling laws for droplet breakup are derived in which the time to diminish a droplet to a critical size is related to the impact pressure, q2. The drop breakup relation is obtained, tbd kq2 to the 12 power, where the value of the constant k is to be determined from experiment. This relationship is valid when the value of the Weber number is much larger than one. A shocktube experiment is described in which detailed photographs of drop motion and breakup are obtained with a high speed framing camera. Drop displacement and breakup data are obtained over a range of shock front Mach number from 1.85 to 2.84 simultaneously impact pressure is varied from 2.67 to 28.4 psi. The value of the drop breakup constant is determined to be, K 23.9 ms-psi to the 12 powerin.

Author(s):
Nicholson, James E.
Author Organization(s):
MITHRAS CAMBRIDGE MA CAMBRIDGE
Descriptive Note:
Technical Report
Pagination:
0030

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release;

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
Nonr-3684(00)
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_1.2.7_Experimentation; JCA_5_Command and Control
Communities of Interest:
Weapons Technologies
Descriptor(s):
RAINDROPS, DISSIPATION FACTOR, WATER IMPINGEMENT, AIRFRAMES, FLOW FIELDS, IMPACT, DROPS, SURFACE TENSION, INERTIA, VISCOSITY, SURFACE ROUGHNESS, BLUNT BODIES
Field(s)/Group(s):
Aerodynamics, Guided Missiles, Fluid Mechanics
Report Date:
1968 Jan 01
Creation Date:
2019 Sep 09