1. Measurement of Dynamic Characteristics of Jet Stream 11/16/2005 by HeeJin, Park Purpose : To measure velocity and distortion of jet stream and verify the hydro-dynamic phenomenon experimentally Condition AtmosphericVacuum Tapered brass nozzle (L=1 in)Done Straight steel nozzle (L=6 in)Done Tapered steel nozzle (L=0) Done No Hole only (L=0.5 in)DoneNo Test Plan - Atmospheric 1.01295 x 105 Pa or N/m2 14.696 PSI or lb/in2 760 torr or mm Hg - Vacuum 1/3 level of atmospheric condition

2. Experimental Setup Front view Left side view Right side view

3. Nozzle Geometry Straight steel nozzle Tapered brass nozzle Tapered steel nozzle Hole nozzle

4. Configuration High Speed Camera SettingDistance Setting Frame Rate(fps)2500 Exposure Time(µs)200 Resolution1280×200 Distance from Nozzle incm front410 center1537.5 rear2357.5 Total2767.5

5. Captured Image Brass Nozzle (atmospheric) Front Region Middle Region Rear Region

6. Captured Image Brass Nozzle (vacuum) Front Region Middle Region Rear Region

7. Captured Image Straight Steel Nozzle (atmospheric) Front Region Middle Region Rear Region

8. Captured Image Straight Steel Nozzle (vacuum) Front Region Rear Region

9. Captured Image Tapered Steel Nozzle (atmospheric) Front Region Middle Region Rear Region

10. Captured Image Hole Nozzle (atmospheric) Front Region Middle Region Rear Region

11. Result Tapered Brass Nozzle(atmospheric)Tapered Brass Nozzle(vacuum) FrontCenterRearFrontCenterRear Distance(in)/Frame0.2 0.25 Distance(m)/Frame0.005 0.00625 Time(s)/Frame0.0004 Velocity(m/s)12.5 15.625 Distortionuniform disperseuniform disperse Straight Steel Nozzle(atmospheric)Straight Steel Nozzle(vacuum) FrontCenterRearFrontCenterRear Distance(in)/Frame0.30.2 0.30.25 Distance(m)/Frame0.00750.005 0.00750.00625 Time(s)/Frame0.0004 Velocity(m/s)18.7512.5 18.7515.625 Distortionuniformdisperse uniformdisperse

12. Result Tapered Steel Nozzle(atmospheric) FrontCenterRear Distance(in)/Frame0.2 0.18 Distance(m)/Frame0.005 0.0045 Time(s)/Frame0.0004 Velocity(m/s)12.5 11.25 Distortiondisperse Hole Nozzle(atmospheric) FrontCenterRear Distance(in)/Frame0.2 0.15 Distance(m)/Frame0.005 0.00375 Time(s)/Frame0.0004 Velocity(m/s)12.5 9.375 Distortiondisperse

13. atmospherebar1.01295 atmospheredynes/cm 2 1.01295 x 10 6 atmospherein. Hg29.9213 atmospherein. water406.86 atmospherekg/cm 2 1.03325 atmospherembar1012.95 atmospheremtorr or micron Hg7.6 x 10 5 atmospherePa or N/m 2 1.01295 x 10 5 atmospherePSI or lb/in 2 14.696 atmospheretorr or mm Hg760 Reference