Effect of solid paraffin's on crude oil rheology

Effect of solid paraffin on crude oil rheology was investigated. The experiments were carried out on model-crude oil at constant temperature 30?C. Medical paraffin malting point of 61 ?C different concentration was dissolved in kerosene fraction. Concentration range of paraffin was from 1 to 32% weight. Shear stress strongly depends on paraffin's content only over high shear rate. Shear stress increases exponentially with increasing paraffin concentration for high shear rate. This dependence does not existed for real crude oil investigated in this paper.

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Analysis of Thrombus Formation Process by Flow Induced High Shear Rate Using Optical Observation Method

Volume 3B: Biomedical and Biotechnology Engineering ◽

10.1115/imece2013-63940 ◽

2013 ◽

Author(s):

Masaaki Tamagawa

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Formation Process ◽

Thrombus Formation ◽

Laser Sheet ◽

Formation Rate ◽

High Shear Rate ◽

Square Root ◽

High Shear ◽

Observation Method

This paper describes visualization of thrombus formation process on orifice flows by laser sheet beam and normal illumination. The aim is to investigate the effects of shear stress or shear rate on the thrombus formation or thrombus formation rate. It was found that the white thrombus formation rate is proportional to square root of shear rate, and the white thrombus is dominant when the shear rate is more than 450 (1/s).

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Effects of High Shear Rate on Thrombus Formation Rate on Pipe Orifice Flows Using Laser Sheet Method and the Prediction of Thrombus Formation Rate by CFD

Volume 2: Biomedical and Biotechnology ◽

10.1115/imece2012-86806 ◽

2012 ◽

Cited By ~ 1

Author(s):

Masaaki Tamagawa

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Plasma Flow ◽

Formation Process ◽

Thrombus Formation ◽

Laser Sheet ◽

Formation Rate ◽

High Shear Rate ◽

High Shear ◽

Rate Region

This paper describes visualization of thrombus formation process on orifice flows by laser sheet beam. The aim is to investigate the effects of shear stress or shear rate on the thrombus formation or thrombus formation rate. In this investigation, by visualization of the thrombus formation in blood plasma flow, it was found that the high shear rate region of the flow has large effects of the thrombus formation.

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Morphology and rheology of PP/POE blends in high shear stress field

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705717734908 ◽

2017 ◽

Vol 31 (9) ◽

pp. 1263-1280 ◽

Cited By ~ 4

Author(s):

Jiru Ying ◽

Xiaolin Xie ◽

Shaoxian Peng ◽

Huamin Zhou ◽

Dequn Li

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Stress Field ◽

Polymer Blends ◽

Morphological Evolution ◽

High Shear Rate ◽

Dispersed Phase ◽

High Shear ◽

High Shear Stress ◽

Shear Stress Field

Polypropylene (PP)/polyolefin elastomer (POE; ethylene–octene copolymer) blends with varying weight percentages of POE were prepared in a twin-screw extruder and molded through high shear rate injection-molding process. The morphologies and rheology of the PP/POE blends were systematically investigated based on rheological data and experimental analysis. The results indicate that the polymer blends of plastic and rubber in a high shear stress field result in a multilayered microstructure, which can be divided into skin, transitional, shear, and core layers according to the morphology of the dispersed phase. The morphology formation of the dispersed phase depends on the shear field and temperature field in the processing. Morphological evolution of the dispersed POE phases in PP matrix was described and quantified. A dragging ellipsoid model and capillary number were employed to describe the morphological evolution of the dispersed phase, and the morphological parameters were obtained. The results show that the dragging ellipsoid model is well suited to explain the morphological evolution of the dispersed phase in polymer blends molded under high shear rate.

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Shear Stress Measurements of Non-Spherical Particles in High Shear Rate Flows

10.1063/1.2964830 ◽

2008 ◽

Author(s):

Erin Koos ◽

Melany L. Hunt ◽

Christopher E. Brennen ◽

Albert Co ◽

Gary L. Leal ◽

...

Keyword(s):

Shear Stress ◽

Shear Rate ◽

High Shear Rate ◽

Spherical Particles ◽

High Shear ◽

Stress Measurements

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Observation of Thrombus Formation Process by High Shear Rate on Various Flows and CFD Based Prediction Method for Thrombus Formation Rate

Volume 3: Biomedical and Biotechnology Engineering ◽

10.1115/imece2014-38002 ◽

2014 ◽

Author(s):

Masaaki Tamagawa

Keyword(s):

Shear Stress ◽

Shear Rate ◽

Quantitative Evaluation ◽

Formation Process ◽

Thrombus Formation ◽

Formation Rate ◽

Prediction Method ◽

High Shear Rate ◽

High Shear

This paper describes visualization of thrombus formation process on orifice flows and Couette flows by normal illumination. The aim is to investigate the effects of shear stress or shear rate on the thrombus formation or thrombus formation rate. It was found that (1) effect of flow types on the thrombus ratio was obtained and (2) quantitative evaluation of thrombus formation rate by our proposed CFD based prediction method was established for various flows.

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