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<p class=MsoNormal><span style='font-size:16.0pt;font-variant:small-caps'>master$B!G(Bs
Thesis Defense: <b>Aritra Sur<o:p></o:p></b></span></p>
<p class=MsoNormal><b><span style='font-size:16.0pt;font-variant:small-caps'><o:p> </o:p></span></b></p>
<p class=MsoNormal><span style='font-variant:small-caps'>Committee Members: D</span>r.
Dong Liu, Dr. Keith Hollingsworth (Mechanical Engineering), Dr. Manolis
Doxastakis (Chemical Engineering)<span style='font-variant:small-caps'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-variant:small-caps'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-variant:small-caps'>Date and Time: 4<sup>th</sup>
Aug, 2010, 2.00 pm - 4.00 pm, Location: ME Large Conference Room<o:p></o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-variant:small-caps'><o:p> </o:p></span></b></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='font-variant:small-caps'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:16.0pt;font-variant:small-caps'>Abstract<o:p></o:p></span></b></p>
<p class=MsoNormal style='margin-bottom:3.0pt;text-indent:.5in;line-height:
150%;text-autospace:none'>In this work, adiabatic water-air two-phase flows
were studied experimentally in circular microchannels with inner diameters of
100, 180 and 324 $B&L(Bm. High-speed photographic technique was employed to
visualize the two-phase flow patterns over a wide range of liquid and gas
superficial velocities. Two-phase flow maps were constructed and the transition
boundaries between different flow regimes were identified. In addition, the
two-phase pressure drop was measured and compared with the models available in
the literature. <span style='font-size:12.0pt;line-height:150%'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:3.0pt;text-indent:.5in;line-height:
150%;text-autospace:none'>To further explore the fundamental mechanisms
governing the two-phase flow pattern formation, a cross-junction microfluidic
chip with a rectangular cross section of 300 $B&L(Bm $B!_(B 100 $B&L(Bm was used to explore
the dynamics of bubbly, slug and annular flows. Numerical models using the
volume-of-fluid (VOF) approach were developed to simulate the two-phase mixing
and flow pattern development in the microfluidic chip. The roles of the
inertia, viscous shear and surface tension forces in two-phase flows were
evaluated. <o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:3.0pt;text-indent:.5in;line-height:
150%;text-autospace:none'>Finally, the effects of surfactant on the two-phase
flow pattern and pressure drop in microchannels were studied with the
motivation that addition of surfactant will help to eliminate intermittent
two-phase flow patterns and alleviate flow instability. Air-water mixtures with
trace quantities of sodium dodecyl sulfate (SDS) were used in the experiments.
The results were compared to the data obtained from water-air flow without surfactants.
It was found that addition of surfactants brings in significant modification to
the two-phase flow regimes and their transition characteristics in
microchannels, in particular, the most intermittent slug flow is effectively
suppressed however, the two-phase pressure drop is reduced.<span
style='font-size:16.0pt;line-height:150%;font-variant:small-caps'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>_______________________________________________________</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>Suresh K. Khator, Ph.D., P.E.
Phone:
713-743-4205 <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>Associate Dean, College of Engineering Fax:
713-743-4214<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>University of
Houston Email:
skhator@uh.edu <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>E421 Engineering Bldg
2 www.egr.uh.edu/ie<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";
color:blue'>Houston, TX 77204-4008<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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