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) |
|---|---|
| Title of host publication | American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED |
| Publisher | Publ by American Soc of Mechanical Engineers (ASME) |
| Pages | 84-89 |
| Number of pages | 6 |
| Volume | 64 |
| State | Published - 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 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
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Fluid mechanics of cavitation inception in rectangular slots. / Cimbala, John Michael; Blair, William G.
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 64 Publ by American Soc of Mechanical Engineers (ASME), 1988. p. 84-89.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Fluid mechanics of cavitation inception in rectangular slots
AU - Cimbala, John Michael
AU - Blair, William G.
PY - 1988
Y1 - 1988
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.
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M3 - Conference contribution
VL - 64
SP - 84
EP - 89
BT - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
PB - Publ by American Soc of Mechanical Engineers (ASME)
ER -