Stability and mixing of submerged turbulent jets at low Reynolds numbers
Originally presented as the first author's thesis (M.S.), Temperature reduction in a submerged vertical jet in the laminar-turbulent transition, M.I.T. Dept. of Civil Engineering
| Main Authors: | , , |
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| Format: | Technical Report |
| Language: | en_US |
| Published: |
MIT Energy Lab
2005
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| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/27517 |
| _version_ | 1811072522668474368 |
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| author | Ungate, Christopher David Harleman, Donald R. F. Jirka, Gerhard Hermann |
| author_facet | Ungate, Christopher David Harleman, Donald R. F. Jirka, Gerhard Hermann |
| author_sort | Ungate, Christopher David |
| collection | MIT |
| description | Originally presented as the first author's thesis (M.S.), Temperature reduction in a submerged vertical jet in the laminar-turbulent transition, M.I.T. Dept. of Civil Engineering |
| first_indexed | 2024-09-23T09:07:14Z |
| format | Technical Report |
| id | mit-1721.1/27517 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:07:14Z |
| publishDate | 2005 |
| publisher | MIT Energy Lab |
| record_format | dspace |
| spelling | mit-1721.1/275172019-04-10T20:51:59Z Stability and mixing of submerged turbulent jets at low Reynolds numbers Ungate, Christopher David Harleman, Donald R. F. Jirka, Gerhard Hermann Jets -- Fluid dynamics Thermal pollution of rivers, lakes Reynolds number Diffusers Hydraulic models Originally presented as the first author's thesis (M.S.), Temperature reduction in a submerged vertical jet in the laminar-turbulent transition, M.I.T. Dept. of Civil Engineering An experimental study is made of the variation of volume and centerline dilution as a function of Reynolds number in non- buoyant and buoyant round jets discharged vertically from a submerged nozzle. The jet Reynolds numbers covered the laminar- turbulent transition with values ranging from Re = u D/v = 100 to 20,000 where u = jet exit velocity, D = jet diameter, and V = kinematic viscosity. Measurements of jet temperature profiles are obtained by using both fast and slow thermistor probes. Turbulent dilution is found to be independent of Reynolds number for non-buoyant jets above a critical Reynolds number of about 1,500. For buoyant jets (densimetric Froude numbers in the range 25 to 50), the critical Reynolds number is about 1,200. Reasonable agreement is obtained with the results of previous investigators for dilution values at high Reynolds numbers. Dye studies of transition Reynolds numbers are compared with a study by A.F. Pearce (1966) and good agreement is found. The results are useful in determining the minimum length scale ratio for hydro-thermal model studies, especially those of submerged multiport diffusers. It is concluded that modeling of turbulent jets is acceptable provided the model Reynolds number is larger than the critical Reynolds number and provided no other constraint becomes binding. In addition, the model jet's laminar length, if any, must be insignificant when compared to the total length of the path of the jet. New England Electric System and Northeast Utilities Service Company under the M.I.T. Energy Laboratory Electric Power Program 2005-09-21T19:23:04Z 2005-09-21T19:23:04Z 1975 Technical Report 02191981 http://hdl.handle.net/1721.1/27517 en_US MIT-EL 75-014 3439304 bytes application/pdf application/pdf MIT Energy Lab |
| spellingShingle | Jets -- Fluid dynamics Thermal pollution of rivers, lakes Reynolds number Diffusers Hydraulic models Ungate, Christopher David Harleman, Donald R. F. Jirka, Gerhard Hermann Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title | Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title_full | Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title_fullStr | Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title_full_unstemmed | Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title_short | Stability and mixing of submerged turbulent jets at low Reynolds numbers |
| title_sort | stability and mixing of submerged turbulent jets at low reynolds numbers |
| topic | Jets -- Fluid dynamics Thermal pollution of rivers, lakes Reynolds number Diffusers Hydraulic models |
| url | http://hdl.handle.net/1721.1/27517 |
| work_keys_str_mv | AT ungatechristopherdavid stabilityandmixingofsubmergedturbulentjetsatlowreynoldsnumbers AT harlemandonaldrf stabilityandmixingofsubmergedturbulentjetsatlowreynoldsnumbers AT jirkagerhardhermann stabilityandmixingofsubmergedturbulentjetsatlowreynoldsnumbers |