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SUMMARY:Visco-plastic lubrication: from theory to application - Sarah Horm
 ozi (Universite Paris Est\, Laboratoire Navier)
DTSTART:20140403T120000Z
DTEND:20140403T130000Z
UID:TALK51714@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:A common problem in multi-layer shear flows\, especially from 
 the perspective of process engineering\, is the occurrence of interfacial 
 instabilities. For purely viscous fuids these occur at low Reynolds number
 s. However\, multi-layer duct flows can be stabilised by astute positionin
 g of a visco-plastic fluid as the lubricant that remains unyielded at the 
 interface. This technique has been termed visco-plastic lubrication.\nIn t
 his talk\, I will start with an introduction to Visco-Plastically Lubricat
 ed (VPL)  flows. Then I will present the results of a systematic study aim
 ed at extending visco-plastic lubrication from a theoretical concept towar
 ds more industrial applications. The results come in two parts. Firstly\, 
 a computational study of VPL flows will be presented in the setting of a N
 ewtonian core fluid surrounded by a Bingham lubricating\nfluid\, within pi
 pe and channel configurations. Flow development and start-up are explored.
  Non-linear perturbations are also studied to obtain better understanding 
 about the stability of these flows\, e.g. what role does the unyielded plu
 g play\, do perturbations remain concentric or develop asymmetries\, how l
 arge an amplitude of perturbation can be withstood and at what flow rate. 
 These are essential questions for industrial prototyping. Secondly\, I wil
 l show the feasibility of VPL flows with viscoelastic core fluids from bot
 h experimental and theoretical perspectives. Viscoelastic fluids are frequ
 ently used in the polymer and food industries\, which are large areas for 
 application.\nI will close by connecting visco-plastic lubrication to pote
 ntial novel applications in stable core-annular oil pipelining\, in manufa
 cturing and in droplet encapsulation.\n\nBiography:\nSarah Hormozi is a Po
 stdoctoral Fellow at the Universite Paris Est\, Laboratoire Navier. Her p
 ostdoctorate is sponsored by the Natural Sciences and Engineering Research
  Council of Canada (NSERC). Sarah completed her Ph.D. in Mechanical Engine
 ering from the University of British Columbia in 2011. Her research intere
 sts mainly lie in the broad field of non-Newtonian fluid mechanics\, rangi
 ng from computation to experiment to theory. She has authored around 20 jo
 urnal and conference publications in the area of fluid mechanics. Sarah is
  the recipient of both industrial and academic Post-Doctoral Fellowships f
 rom NSERC. At UBC\, Sarah served as Instructor and Teaching Assistant for 
 several courses in Mechanical Engineering and Applied Mathematics Departme
 nts\, and also as the manager of Complex Fluid Laboratory. She will be joi
 ning the faculty at the Ohio University this coming fall. 
LOCATION:MR5\, Centre for Mathematical Sciences
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