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<div dir="ltr"><b style="font-family: "Times New Roman", serif; font-size: 12pt;"><span style="font-size: 14pt; text-transform: uppercase;">Name:</span></b><span style="font-family: "Times New Roman", serif; font-size: 14pt; text-transform: uppercase;">
</span><span style="font-family: "Times New Roman", serif; font-size: 14pt;">Bhaskar Sarkar</span><br>
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<p class="MsoNormal"><span style="font-size:18.0pt"> <b> </b></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">DATE: </span></b><span style="font-size:14.0pt">Tuesday, June 15, 2021</span></p>
<p class="MsoNormal"><b><span style="font-size:18.0pt"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">TIME: </span></b><span style="font-size:14.0pt">2:00 PM</span></p>
<p class="MsoNormal"><b><span style="font-size:18.0pt"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">COMMITTEE CHAIR: </span></b><span style="font-size:14.0pt">Prof. Vemuri Balakotaiah</span></p>
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<p class="MsoNormal"><b><span style="font-size:14.0pt">LOCATION: Zoom Link</span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"><a href="https://urldefense.com/v3/__https:/uofh.zoom.us/j/97343914318?pwd=T0xsSU9WK0tqYzZoUkE1aFBsSXlRZz09&from=addon__;!!LkSTlj0I!S6O1ir6YPnrYUfZVyWtcIPnWg8NWr26jRq6jXk5JMP5vtWjSjwQJEMrZZM2BsyGa5odl$"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#39394D">https://uofh.zoom.us/j/97343914318</span></a></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"><a href="https://urldefense.com/v3/__https:/uofh.zoom.us/j/97343914318?pwd=T0xsSU9WK0tqYzZoUkE1aFBsSXlRZz09&from=addon__;!!LkSTlj0I!S6O1ir6YPnrYUfZVyWtcIPnWg8NWr26jRq6jXk5JMP5vtWjSjwQJEMrZZM2BsyGa5odl$"><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#39394D">pwd=T0xsSU9WK0tqYzZoUkE1aFBsSXlRZz09&from=addon</span></a></span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#39394D">
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<p class="MsoNormal">Meeting ID: 973 4391 4318</p>
<p class="MsoNormal" style="margin-bottom:8.0pt; line-height:105%">Password: 803049<span style="font-family:"Calibri",sans-serif; color:black"> </span></p>
<p class="MsoNormal" style="margin-bottom:8.0pt; line-height:105%"><b><span style="font-size:14.0pt; line-height:105%">TITLE:
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt">Ignition-Extinction Analysis of Coupled Homogeneous-Heterogeneous Reactions in Monolith Reactors</span></b></p>
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<p class="MsoBodyText" style="text-indent:0in"><b>ABSTRACT:</b></p>
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We use a multi-scale multi-mode reduced order model for coupled homogeneous-catalytic reaction systems to present a comprehensive ignition-extinction analysis of catalytically assisted propane and hydrogen combustion and oxidative coupling of methane (OCM)
in monolith, gauze or wire-mesh type reactors. The reduced order models are expressed in terms of phase averaged multiple concentration (temperature) modes and interfacial fluxes which are related through various transfer coefficients that are local scale,
flow and property dependent. Accurate expressions are provided for estimating the local transfer coefficient matrices in multi-component systems.
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Using these reduced order models, the space of design and operating variables are explored to determine the different types of ignition-extinction behaviors occurring in the catalytically assisted combustion processes. Bifurcation theory is used to construct
phase diagrams in the plane of equivalence ratio versus feed temperature and equivalence ratio versus space time to classify the behaviors occurring and the extent of coupling between the homogeneous and catalytic conversion of the fuel. We also examine the
impact of channel hydraulic diameter, precious metal (Pt) loading/dispersion, Lewis number, heat loss effects, reactor length, and substrate thermal conductivity on the ignition-extinction behavior. The results of the comprehensive analysis are used to present
guidelines on the design and scale-up of monolith reactors for carrying out the catalytically assisted combustion processes.</p>
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In OCM, we determine the impact of methane to oxygen ratio in the feed, space time, channel hydraulic radius, washcoat properties, operating pressure and substrate thermal conductivity on the ignition-extinction behavior of the system as a function of the feed
temperature. The computations show that for typical operating conditions, the methane conversion and C©ü product selectivity are non-monotonic on the ignited branch and there exists an optimum point of operation away from the extinction point. We also present
the various species and temperature profiles along the length of the reactor and examine how these profiles are impacted by the substrate conductivity, space time and heat loss. The results obtained for monolith, gauze or wire-mesh reactors are compared to
those in packed-beds and suggestions are provided for scale-up and optimization of these reactors for carrying out OCM.</p>
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