Luminescence from laser-induced bubbles in water-glycerol mixtures by a74abaf35cd8e297

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									         Luminescence from laser-induced bubbles in
          water-glycerol mixtures: effect of viscosity
      Gary A. Williams, University of CA-Los Angeles, DMR 0548521
We are studying the effect of viscosity on the
luminescence emitted by collapsing bubbles, by
carrying out the measurements in water-glycerol
mixtures. The figure at the right shows the bubble
motion a few microseconds before the collapse point;
the bright spot at the center is the luminescence
emitted by the compressional heating of the gas
inside the bubble to about 10,000 K.




                                       We find that increasing the viscosity increases the
                                       duration of the luminescence pulse. The plot on the
                                       left shows the pulse width divided by the maximum
                                       bubble radius as a function of glycerol concentration
                                       and hydrostatic pressure on the cell. 60% glycerol
                                       has about 15 times the viscosity of water, and this
                                       increases the pulse widths by factors of 2 to 3.
    Gary A. Williams, University of CA-Los Angeles, DMR 0548521

Students trained on the bubble luminescence experiment


 Erin Englert                                                                   Allison McCarn




 UCLA graduate student Erin Englert has spearheaded the luminescence experiment, and was joined in
 summer 2006 by REU undergraduate student Allison McCarn from North Carolina State (shown here
 with labmate Sonny Vo on a lab outing to Dodger Stadium). Allison has now gone on to graduate
 school at Michigan State.

								
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