Abstract
In order to better understand the fluid mechanics associated with cavitation inception in slots, the flow over a rectangular slot along a flat wall was studied in a non-cavitating fluid, namely air. Flow visualization experiments revealed the highly unsteady nature of the vortex-like structure(s) that developed inside the slot. Flow visualization of the slot entrance region showed that mass is transferred into the slot from the wall boundary layer; however, this mass does not appear to be drawn into the core of the primary vortex inside the slot. Direct pressure measurements inside the slot provided time-averaged contour plots of the pressure coefficient. These isobars were then used to obtain the location of the primary vortex, and also to document the minimum pressure coefficient as a function of aspect ratio. The measured pressure coefficients inside the slot are an order of magnitude lower than those for which cavitation has been observed in previous water tunnel experiments. These measurements therefore lead to question the interpretation of the previous water tunnel slot cavitation experiments. Specifically, it is likely that the previously reported cavitation was not vaporous cavitation, as had been assumed.
| Original language | English (US) |
|---|---|
| Pages | 84-89 |
| Number of pages | 6 |
| State | Published - Dec 1 1988 |
| Event | Cavitation and Multiphase Flow Forum - 1988 - Cincinnati, OH, USA Duration: Jul 24 1988 → Jul 28 1988 |
Other
| Other | Cavitation and Multiphase Flow Forum - 1988 |
|---|---|
| City | Cincinnati, OH, USA |
| Period | 7/24/88 → 7/28/88 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
}
Fluid mechanics of cavitation inception in rectangular slots. / Cimbala, John M.; Blair, William G.
1988. 84-89 Paper presented at Cavitation and Multiphase Flow Forum - 1988, Cincinnati, OH, USA, .Research output: Contribution to conference › Paper
TY - CONF
T1 - Fluid mechanics of cavitation inception in rectangular slots
AU - Cimbala, John M.
AU - Blair, William G.
PY - 1988/12/1
Y1 - 1988/12/1
N2 - In order to better understand the fluid mechanics associated with cavitation inception in slots, the flow over a rectangular slot along a flat wall was studied in a non-cavitating fluid, namely air. Flow visualization experiments revealed the highly unsteady nature of the vortex-like structure(s) that developed inside the slot. Flow visualization of the slot entrance region showed that mass is transferred into the slot from the wall boundary layer; however, this mass does not appear to be drawn into the core of the primary vortex inside the slot. Direct pressure measurements inside the slot provided time-averaged contour plots of the pressure coefficient. These isobars were then used to obtain the location of the primary vortex, and also to document the minimum pressure coefficient as a function of aspect ratio. The measured pressure coefficients inside the slot are an order of magnitude lower than those for which cavitation has been observed in previous water tunnel experiments. These measurements therefore lead to question the interpretation of the previous water tunnel slot cavitation experiments. Specifically, it is likely that the previously reported cavitation was not vaporous cavitation, as had been assumed.
AB - In order to better understand the fluid mechanics associated with cavitation inception in slots, the flow over a rectangular slot along a flat wall was studied in a non-cavitating fluid, namely air. Flow visualization experiments revealed the highly unsteady nature of the vortex-like structure(s) that developed inside the slot. Flow visualization of the slot entrance region showed that mass is transferred into the slot from the wall boundary layer; however, this mass does not appear to be drawn into the core of the primary vortex inside the slot. Direct pressure measurements inside the slot provided time-averaged contour plots of the pressure coefficient. These isobars were then used to obtain the location of the primary vortex, and also to document the minimum pressure coefficient as a function of aspect ratio. The measured pressure coefficients inside the slot are an order of magnitude lower than those for which cavitation has been observed in previous water tunnel experiments. These measurements therefore lead to question the interpretation of the previous water tunnel slot cavitation experiments. Specifically, it is likely that the previously reported cavitation was not vaporous cavitation, as had been assumed.
UR - http://www.scopus.com/inward/record.url?scp=0024132931&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024132931&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:0024132931
SP - 84
EP - 89
ER -