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T. A. Cheema, G. M. Kim, C. Y. Lee, J. G. Hong, M. K. Kwak, C. W. Park
Characteristics of blood vessel wall deformation with porous wall conditions in an aortic arch

Appl. Rheol. 24:2 (2014) 24590 (8 pages)

Blood vessels have been modeled as non-porous structures that are permeable to solutes mixed in the blood. However, the use of non-physiological boundary conditions in numerical simulations that assume atmospheric pressure at the outlet does not illustrate the actual structural physics involved. The presence of pores in the wall influences wall deformation characteristics, which may increase the risk of rupture in specific conditions. In addition, the formation of secondary flows in a curved blood vessel may add complications to the structural behavior of the vessel walls. These reservations can be addressed by a fluid structure interaction-based numerical simulation of a three-dimensional aortic arch with increased physiological velocity and pressure waveforms. The curvature radius of the arch was 30 mm with a uniform aorta diameter of 25 mm. A one-way coupling method was used between physics of porous media flow and structural mechanics. A comparison of results with a non-porous model revealed that the approximated porous model was more prone to hypertension and rupture. Similarly, the secondary flows found to be an important indicator for the vascular compliance that forced the outer aortic region to experience the largest deformation. Consequently, it is very important to use actual physiological situations of the blood vessels to reach a diagnostic solution.

Cite this publication as follows:
Cheema TA, Kim GM, Lee CY, Hong JG, Kwak MK, Park CW: Characteristics of blood vessel wall deformation with porous wall conditions in an aortic arch, Appl. Rheol. 24 (2014) 24590.

Suman Sinha-Ray, Raman Srikar, Chris C. Lee, Alfred Li, Alexander L. Yarin
Shear and elongational rheology of gypsum slurries

Appl. Rheol. 21:6 (2011) 63071 (8 pages)

Concentrated gypsum slurries used for wallboard production are studied using shear and elongational rheometers. It is shown that the rheological behavior of different slurry compositions can be sufficiently accurately described in the framework of the Ostwald-de Waele power law, which reproduces both shear and elongational experimemtal data with sufficiently close values of the consistency and flow behavior indexes for each slurry composition studied.

Cite this publication as follows:
Sinha-Ray S, Srikar R, Lee CC, Li A, Yarin AL: Shear and elongational rheology of gypsum slurries, Appl. Rheol. 21 (2011) 63071.

Chung Fang, Cheng-Hsien Lee
Unsteady parallel flows of an elasto-visco-hypoplastic fluid with oscillating boundary

Appl. Rheol. 18:4 (2008) 45001 (11 pages)

In the present study, an evolution equation for the Cauchy stress tensor is proposed to take elastic, viscous and plastic characteristics of complex fluids simultaneously into account. In particular, hypoplasticity is incorporated to account for the plastic features. The stress model is applied to investigate time-dependent flows of an elasto- visco-plastic fluid driven by an oscillating boundary with/without an additional stationary boundary to study the cyclic responses and the model performance. Numerical simulations show that while different degrees of elastic and viscous effects can be captured by varying the model parameters, plastic deformation plays a significant role in the velocity distribution, and can be simulated appropriately by use of hypoplasticity. The stress model is capable of accounting for the combined elastic, viscous and plastic features of complex materials in transient motions, and applications may be found in geomorphic fluid motions like granular and debris flows, and flows involving polymers.

Cite this publication as follows:
Fang C, Lee C: Unsteady parallel flows of an elasto-visco-hypoplastic fluid with oscillating boundary, Appl. Rheol. 18 (2008) 45001.

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