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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