The efficiency of turbulent mixing in stratified fluids

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dc.contributor.advisor Swinney , H . L . , 1939 -
dc.contributor.committeeMember Fink , Manfred
dc.creator Ebert , Guenther Wolfgang
dc.date.accessioned 2011 -01 -03T21 :19 :27Z
dc.date.accessioned 2011 -01 -03T21 :19 :44Z
dc.date.accessioned 2014 -02 -19T22 :48 :38Z
dc.date.available 2011 -01 -03T21 :19 :27Z
dc.date.available 2011 -01 -03T21 :19 :44Z
dc.date.available 2014 -02 -19T22 :48 :38Z
dc.date.created 2010 -08
dc.date.issued 2011 -01 -03
dc.date.submitted August 2010
dc.identifier.uri http : / /hdl .handle .net /2152 /ETD -UT -2010 -08 -1876
dc.description.abstract Mixing is a common feature of stratified fluids . In stratified fluids the density varies with the height . This is true for the most fluids in geophysical environments , like lakes , the atmosphere or the ocean . Turbulent mixing plays a crucial role for the overall energy budget of the earth and has therefore an huge impact on the global climate . By introducing the mixing efficiency , it is possible to quantify mixing . It is defined as the ratio of gain of potential energy to the injection of mechanical energy . In the ocean energy provided by tidal forces leads to turbulence and thus highly dense water is lifted up from the deep sea to the surface . For this process , a mixing efficiency of 0 .2 is estimated . Until now it is not completely understood how this high value can be achieved . Thus we measured the mixing efficiency by using a Couette -Taylor system , which can produce steady -state homogeneous turbulence . This is similar to what we find in the ocean . The Couette -Taylor system consists of two concentric cylinders that can be rotated independently . In between a stratified fluid is filled using salt as a stratifying agent . In the laboratory experiment , we obtained mixing efficiencies in the order of 0 .001 as a result . Moreover we found that the mixing efficiency decreases with decreasing stratification like previous laboratory experiments have shown . As this value is two orders of magnitude smaller than what we find in the ocean , further studies will be necessary .
dc.format.mimetype application /pdf
dc.language.iso eng
dc.subject Stratification
dc.subject Stratified fluid
dc.subject Mixing
dc.subject Mixing efficiency
dc.subject Couette -Taylor
dc.subject Turbulence
dc.title The efficiency of turbulent mixing in stratified fluids
dc.description.department Physics
dc.type.genre thesis *
dc.type.material text *
thesis.degree.name Master of Arts
thesis.degree.level Masters
thesis.degree.discipline Physics
thesis.degree.grantor University of Texas at Austin
thesis.degree.department Physics
dc.date.updated 2011 -01 -03T21 :19 :44Z

Citation

The efficiency of turbulent mixing in stratified fluids. Master's thesis, University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /ETD -UT -2010 -08 -1876 .

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