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Shear Rheology of Viscous Interfaces...

Raghunandan, Aditya.

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Shear Rheology of Viscous Interfaces Coupled to Bulk Flow.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Shear Rheology of Viscous Interfaces Coupled to Bulk Flow./
Author:	Raghunandan, Aditya.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	62 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
Contained By:	Dissertation Abstracts International79-12B(E).
Subject:	Fluid mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10749068
ISBN:	9780438206311

Shear Rheology of Viscous Interfaces Coupled to Bulk Flow.
Raghunandan, Aditya.

Shear Rheology of Viscous Interfaces Coupled to Bulk Flow. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 62 p.

Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.

Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2018.

This thesis describes the Newtonian (linear) and non-Newtonian (nonlinear) interfacial shear rheology of phospholipid dipalmitoylphosphotidylcholine (DPPC) deformed in a direct-shear contact knife-edge flow geometry. DPPC plays a crucial role in human health and physiology. Monolayers of DPPC regulate the surface tension during breathing and control the flow of the liquid lining the alveolus in human lungs. DPPC also assembles into bilayers that constitute the cell membrane, imparting fluidity that facilitates nutrient and gas exchange in the living cell.

ISBN: 9780438206311Subjects--Topical Terms:

528155
Fluid mechanics.

Shear Rheology of Viscous Interfaces Coupled to Bulk Flow.
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100 1 $a Raghunandan, Aditya. $3 3351359
245 1 0 $a Shear Rheology of Viscous Interfaces Coupled to Bulk Flow.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 62 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
500 $a Adviser: Amir H. Hirsa.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2018.
520 $a This thesis describes the Newtonian (linear) and non-Newtonian (nonlinear) interfacial shear rheology of phospholipid dipalmitoylphosphotidylcholine (DPPC) deformed in a direct-shear contact knife-edge flow geometry. DPPC plays a crucial role in human health and physiology. Monolayers of DPPC regulate the surface tension during breathing and control the flow of the liquid lining the alveolus in human lungs. DPPC also assembles into bilayers that constitute the cell membrane, imparting fluidity that facilitates nutrient and gas exchange in the living cell.
520 $a This study focuses on modeling and measuring the viscous response of DPPC and impact of the inherently coupled flows in the bulk and interfacial phases on rheology. Depending on the surface packing and corresponding reduction in surface tension, monolayers of DPPC exhibit a wide range of phase morphologies. Upon shearing the monolayer, its viscous response varies from that of an essentially inviscid film at low surface packing, to that of a highly viscous non-Newtonain (shear thinning) film when the packing is dense. The thesis highlights that significant primary and secondary flows are produced in the bulk phase when a finitely viscous film is sheared at the interface. The more viscous the film, the stronger the driven bulk flow. This nonlinear coupling is measured across hydrodynamic regimes straddling the Stokes ow limit to regimes where the inertia of the bulk phase is significant.
520 $a At low and intermediate surface packing, it was found that DPPC films behave Newtonian (single shear viscosity across shear rates for a given surface packing) and the traditional Boussinesq-Scriven interfacial stress model could capture the experimentally measured viscous interfacial responses and the driven bulk ows. However, at higher surface packings, the nonlinear coupling could not account for the departures from the predicted Newtonian response at the interface. This motivated the development of a a generalized two dimensional (2-D) theoretical framework that could predict observed shear-rate dependent yield stress-like behavior, shear thinning, and Newtonian responses of DPPC films.
520 $a We present a novel interfacial constitutive equation for the material at interfaces that takes a Newtonian functional form but allows shear viscosity to be a function of the local shear rate. We show excellent agreement between measured interfacial non-Newtonian responses and flows predicted at interface. We highlight that DPPC behaves as a shear-thinning material across physiologically relevant shear rates and surface packings, introducing material properties that include consistency and shear-thinning indices. The results and theory introduced in this thesis make significant strides towards unifying the disparate rheological behavior of DPPC films reported in the literature.
590 $a School code: 0185.
650 4 $a Fluid mechanics. $3 528155
650 4 $a Chemical engineering. $3 560457
650 4 $a Mathematics. $3 515831
690 $a 0204
690 $a 0542
690 $a 0405
710 2 $a Rensselaer Polytechnic Institute. $b Mechanical Engineering. $3 2095977
773 0 $t Dissertation Abstracts International $g 79-12B(E).
790 $a 0185
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10749068