[Che-student-staff-list] Reminder: Graduate Seminar - Faculty Lectureship - Hansol Wee - Tomorrow (Attendance Required for All PhD Students)

Wed Apr 3 11:35:56 EDT 2024

[Purdue logo]<https://maillinks.purdue.edu/t/45922180/1710281286/63490351/0/1006672/?x=15bd8470>
Davidson School of Chemical Engineering<https://maillinks.purdue.edu/t/45922180/1710281286/72334380/0/1006672/?x=41fa2a24>
Graduate Seminar Series

Dear All,
On behalf of Purdue University's Davidson School of Chemical Engineering, we are glad to announce our upcoming Faculty Lectureship Graduate Seminar Lecturer, Dr. Hansol Wee. Further information can be found below.

[cid:image001.jpg at 01DA8118.6C280050]<https://maillinks.purdue.edu/t/45922180/1710281286/79579849/0/1006672/?x=27954426>
Dr. Hansol Wee
Post-Doctoral Research Associate
Davidson School of Chemical Engineering
Purdue University

Bio:
After receiving his Bachelors of Science degree in Chemical Engineering from Sogang University in 2014, Dr. Hansol Wee continued on in the same department to receive his Master of Science degree in Chemical Engineering under the guidance of Professor Won Bo Lee (now at Seoul National University).  He then obtained his PHD under the guidance of Professor Osman Basaran at Purdue University in 2023.

"Effects Of Surface Viscosity On Breakup Of Liquid Threads"
April 4, 2024
Seminar:  3:00 p.m. - 4:15 p.m. ET
FRNY G140

- Reception at 2:30 p.m. in FRNY Atrium -

Abstract:
Free surface flows exhibiting hydrodynamic singularities are ubiquitous in technology, daily life, and nature. Examples of such flows include dripping faucets, inkjet printing in both industrial and personal settings, drop-by-drop manufacturing, microarraying, crop spraying, atomization or spray coating, fuel injectors, as well as natural occurrences like fountains and waterfalls. Additionally, they are encountered during the usage of numerous consumer and household products like paints, cleaners, cosmetics, drugs, and foods. After giving a quick overview of the current understanding of pinch-off singularities which arise during the breakup of liquid drops, jets, and threads, the majority of the presentation will be devoted to the role of surface-active additives on pinch-off. Surfactants residing at fluid interfaces not only reduce and induce gradients in surface tension but can also induce additional surface rheological or viscous effects in response to dilatational and shear deformations. Both surface tension and surface viscosities are dependent on surfactant concentration. While the measurement of surface tension and its effects on interfacial flows have become standard practices, determining surface viscosities remains notably challenging. This challenge persists because existing measurement methods often fail to isolate the effects of surface viscous stresses from those attributed to Marangoni stresses. Consequently, the quantitative characterization of surface viscous effects in interfacial flows remains arduous. To address this difficulty, a combined asymptotic and numerical analysis is presented for the pinch-off of a surfactant-covered Newtonian liquid jet. Asymptotically exact solutions derived from slender-jet theory and numerical solutions of the full three-dimensional but axisymmetric (3DA) equations are provided for jets with and without surface rheological effects. The analysis reveals that Marangoni stresses become negligible near pinch-off compared to other forces. Furthermore, it demonstrates that the rate of jet thinning is significantly reduced by surface viscous effects. Simple analytical formulas for inferring surface viscosities are derived from the dynamics near the pinch-off singularity, offering straightforward means for measuring surface viscosity. 3DA simulations confirm the validity of the asymptotic analyses.

Davidson School of Chemical Engineering
chemain at purdue.edu<mailto:chemain at purdue.edu>
(765) 494-4050

FIND US ON SOCIAL MEDIA:

[https://mailimages.purdue.edu/share/twitter-solid-circle.png]<https://maillinks.purdue.edu/t/45922180/1710281286/98615225/2/1006672/?e4eaa8c3=MTAwNjY3Mg&8823dc38=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&2fc32d01=ZWIyOTU4ODgtZjIwNy00MGQ5LTlkYjgtYjE5NjQwMjgyNDY3&18fc3884=NDU5MjIxODA&x=99e681b3>

[https://mailimages.purdue.edu/share/linkedin-solid-circle.png]<https://maillinks.purdue.edu/t/45922180/1710281286/98615226/2/1006672/?e4eaa8c3=MTAwNjY3Mg&8823dc38=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&2fc32d01=ZWIyOTU4ODgtZjIwNy00MGQ5LTlkYjgtYjE5NjQwMjgyNDY3&18fc3884=NDU5MjIxODA&x=c984f9b1>

[https://mailimages.purdue.edu/share/instagram-fc-gradient-circle.png]<https://maillinks.purdue.edu/t/45922180/1710281286/98615227/2/1006672/?e4eaa8c3=MTAwNjY3Mg&8823dc38=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&2fc32d01=ZWIyOTU4ODgtZjIwNy00MGQ5LTlkYjgtYjE5NjQwMjgyNDY3&18fc3884=NDU5MjIxODA&x=77813e65>

[https://mailimages.purdue.edu/share/youtube-solid-circle.png]<https://maillinks.purdue.edu/t/45922180/1710281286/98615228/2/1006672/?e4eaa8c3=MTAwNjY3Mg&8823dc38=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&2fc32d01=ZWIyOTU4ODgtZjIwNy00MGQ5LTlkYjgtYjE5NjQwMjgyNDY3&18fc3884=NDU5MjIxODA&x=cab3a78d>

Shop<https://maillinks.purdue.edu/t/45922180/1710281286/78175239/0/1006672/?x=1fdff87b> | Visit<https://maillinks.purdue.edu/t/45922180/1710281286/78217797/0/1006672/?x=ca8096ac> | Give<https://maillinks.purdue.edu/t/45922180/1710281286/78217799/0/1006672/?x=b2c4fbf3>

Forward to a Friend<https://maillinks.purdue.edu/t/45922180/1710281286/100001209/0/1006672/?abb9e380=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&e4eaa8c3=MTAwNjY3Mg&x=f60d3715> | Unsubscribe from this list<https://maillinks.purdue.edu/t/45922180/1710281286/81485602/0/1006672/?f566cc7b=MTcxMDI4MTI4Ni5MQ1lLU1lCTU5N&c1e998ea=cHVyZHVlLWNoZW1pY2FsX2VuZ2luZWVyaW5nLWRhdmlkc29uX3NjaG9vbA&x=452a7cd8> | Unsubscribe from all lists<https://maillinks.purdue.edu/t/45922180/1710281286/82838307/0/1006672/?e4eaa8c3=MTAwNjY3Mg&8823dc38=YmQyZGY4ZDctYjk0My00NDgzLWI3ZjItNWEwNTE4MzE5ODYy&x=3f8605d2> | Privacy Policy<https://maillinks.purdue.edu/t/45922180/1710281286/66794847/0/1006672/?x=58284555>
This email was sent to: chmegrad at ecn.purdue.edu<mailto:chmegrad at ecn.purdue.edu>

This email was sent by: Purdue University Davidson School of Chemical Engineering
Forney Hall, Room 1060
480 Stadium Mall Dr
West Lafayette, IN 47907
765-494-4600

[https://mailimages.purdue.edu/purdueuniversity/PU_SIG_Logo_RGB__PU-H-Full-RGB.png]<https://maillinks.purdue.edu/t/45922180/1710281286/71786932/0/1006672/?x=4a5aa39c>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: </ECN/mailman/archives/che-student-staff-list/attachments/20240403/31751d70/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 155377 bytes
Desc: image001.jpg
URL: </ECN/mailman/archives/che-student-staff-list/attachments/20240403/31751d70/attachment-0001.jpg>