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<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif"><img width="600" height="171" style="width:6.25in;height:1.7812in" id="Picture_x0020_2" src="cid:image001.png@01DBB48E.7AFC1C60" alt="Thesis Defense Announcement at the Cullen College of Engineering"></span><span style="font-family:"Aptos",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<b><span style="font-size:18.0pt;font-family:"Times New Roman",serif;color:#C8102E">Measurement and Analysis of the Viscosity of High-Stability Oils and Lubricants for a Wide Spectrum of Temperatures</span></b><b><span style="font-size:13.5pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></b></p>
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<b><span style="font-size:13.5pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none">Lalitha Paturi
<o:p></o:p></span></b></p>
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<b><span style="font-size:13.5pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p> </o:p></span></b></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;background:white">April 28, 2025, 1:30 p.m. to 2:30 p.m. (CST)</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><br>
Location: </span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;background:white">Petroleum Eng. Bldg. (ERP 9) Room 104</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">
<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">Virtual Link:
</span><span style="font-size:11.0pt;font-family:"Aptos",sans-serif;color:black"><a href="https://urldefense.com/v3/__https://teams.microsoft.com/l/meetup-join/19*3ameeting_ODIzYjNjMGQtNGQzNS00NDA4LTk1YWMtMDFjMzQwMGE1Yjlm*40thread.v2/0?context=*7b*22Tid*22*3a*22170bbabd-a2f0-4c90-ad4b-0e8f0f0c4259*22*2c*22Oid*22*3a*22fbdabfc6-5163-4686-87ab-cd7c27d488c3*22*7d__;JSUlJSUlJSUlJSUlJSUl!!LkSTlj0I!DrdcfK0KI1Hm0_K1OG1r-fhklZpMZR4kYgksbTk6IAe_5yzieGvR9D8IsMdvxZsL3CXzQ-4W2kS6M0GsraLUOjJX3C4$"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#467886;mso-ligatures:none">Lalitha
Paturi Thesis Defense(TEAMS)</span></a></span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><o:p> </o:p></span></p>
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<b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">Committee Chair:</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><br>
</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;background:white">Dr. Birol Dindoruk</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">, Ph.D.
</span><span style="font-size:11.0pt;font-family:"Aptos",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">Committee Members:</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"><br>
</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;background:white">Dr. S.M. Farouq Ali,
</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">Ph.D. | Dr. Yingcai Zheng, Ph.D. |
</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;background:white">Dr. Guan Qin,</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none"> Ph.D.</span><span style="font-size:10.5pt;font-family:"Aptos",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:#C8102E;mso-ligatures:none">Abstract</span></b><span style="font-family:"Arial",sans-serif;color:#C8102E;mso-ligatures:none"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">Understanding and predicting the viscosity behavior of lubricants used in mobility applications is essential to ensuring performance, durability, and safety in automotive,
aerospace, marine, and industrial systems. Lubricants experience wide-ranging thermal and mechanical stresses, and their effectiveness is governed by the stability of their viscosity. However, conventional models often rely on reference viscosities at fixed
temperatures (e.g., 40°C and 100°C) or empirical curve fits, which limit their applicability to chemically diverse or unknown oils without compositional data or benchmark values.<o:p></o:p></span></p>
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<span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">This thesis presents an experimental modeling framework that addresses these limitations by integrating viscosity temperature profiling with molecular weight estimation
via freezing point depression (FPD). Nineteen lubricants including monograde, multigrade, transmission, aviation, synthetic, and marine oils were evaluated using three instruments: the Viscosity 700 portable viscometer for ambient conditions, the CV100 capillary
viscometer, and the Anton Paar MCR rheometer with a high-pressure titanium cell with Julabo CP-200F bath for high-resolution measurements across −20°C to 180°C.<o:p></o:p></span></p>
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<span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">Molecular weights were experimentally determined using benzene as a cryoscopic solvent and validated against established correlations, including
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">(Cragoe, 1929)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">, Modified Cragoes, ASTM D2502
, </span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Drews, 1998a)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">,
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Sim & Daubert, 1980)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">,
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Da Silva, 1992)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">,
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Zanker, 1973)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">,
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Riazi & Daubert, 1986)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">,
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Standing, 1951)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">. These molecular weight values were then embedded
into a reformulated Walther-based viscosity prediction model, eliminating the need for fixed reference viscosities.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:6.0pt;margin-left:0in;text-align:justify;line-height:150%">
<span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">Model accuracy was benchmarked against industry-standard and physics-based models including
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">ASTM D341</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">, (</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">Andrade,
E.N. 1930)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">,</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Vogel, 1921)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black"> and the
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black;mso-ligatures:none">physics-augmented formulation by
</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">(Sinha et al, 2022)</span><span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">. The proposed model demonstrated strong agreement
with experimental data across known and unknown lubricants.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:6.0pt;margin-left:0in;text-align:justify;line-height:150%">
<span style="font-size:10.5pt;line-height:150%;font-family:"Arial",sans-serif;color:black">By linking molecular weight and viscosity through experimentally accessible and cost-effective techniques, this study offers a novel, generalized pathway for predictive
analysis of lubricant behavior. The findings have broad applications in real-time monitoring, sensor-based viscosity estimation, advanced lubricant formulation, and modeling of flow behavior under extreme operating conditions.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif"><img border="0" width="600" height="82" style="width:6.25in;height:.8541in" id="Picture_x0020_1" src="cid:image002.png@01DBB48E.7AFC1C60" alt="Engineered For What's Next"></span><span style="font-family:"Aptos",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none"><o:p> </o:p></span></p>
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