Study Rheological Behavior of Rapeseed Oils Compared to Mineral Oil

This article presents the dependence of dynamic temperature viscosity and shear rate for rapeseed oils used as biodegradable lubricant and SAE 10W. The studied rheograms show the dependence of the dynamic shear rate viscosity as well as the dependence of the dynamic temperature viscosity. From the rheograms there is a decrease in the dynamic viscosity with temperature and shear rate for the two oils. The dynamic viscosity of rapeseed oil is most strongly influenced by the shear rate compared to the studied SAE 10W oil. The rheological behavior of rapeseed and mineral oil SAE 10W was studied with the Haake VT 550 viscometer at temperatures between 40 and 1000C.

Download Full-text

Study rheological behavior of refined rapeseed oil

Technium: Romanian Journal of Applied Sciences and Technology ◽

10.47577/technium.v2i2.271 ◽

2020 ◽

Vol 2 (2) ◽

pp. 20-24

Author(s):

Ioana Stanciu

Keyword(s):

Shear Rate ◽

Constant Temperature ◽

Rheological Behavior ◽

Dynamic Viscosity ◽

Rapeseed Oil ◽

Refining Process ◽

Shear Rates ◽

Lower Viscosity ◽

Viscosity Dependence

Extracted from rapeseed oil was subjected to purification and refining process and then characterized in terms of rheological, ie dynamic viscosity dependence study in terms of speed shear constant temperature. The results show that at 400C, 600C, 800C and 900C dynamic viscosities of oil decreases with shear rate. At higher shear rates of 20s-1 shows lower viscosity oil fluctuations, became almost constant.

Download Full-text

A study of rheological behavior for refined rapeseed oil

Analele Universitatii Ovidius Constanta - Seria Chimie ◽

10.2478/auoc-2013-0010 ◽

2013 ◽

Vol 24 (1) ◽

pp. 51-54

Author(s):

Ioana Stanciu

Keyword(s):

Rheological Behavior ◽

Dynamic Viscosity ◽

Rapeseed Oil ◽

Bingham Fluid ◽

Raw Material ◽

Shear Rates ◽

Mineral Oils ◽

Fluid Behavior

AbstractThe refined rapeseed oil were carefully studied in recent years because they may constitute a raw material for biodegradable lubricants getting organic. These oils are an alternative to synthetic mineral oils. This article presents rheological behavior of refined rapeseed oil. The dynamic viscosity of refined rapeseed oil was determined at temperatures range between 313 - 363 K and shear rates range from 3.3 - 120 s-1. For temperature ranging between 313 - 363 K refined rapeseed oil has a Bingham fluid behavior.

Download Full-text

Rheological Properties of Polysaccharides from Longan (Dimocarpus longanLour.) Fruit

International Journal of Polymer Science ◽

10.1155/2015/168064 ◽

2015 ◽

Vol 2015 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Xingxun Liu ◽

Yongyue Luo ◽

Chunjie Zha ◽

Sumei Zhou ◽

Liya Liu ◽

...

Keyword(s):

Shear Rate ◽

Chemical Analysis ◽

Rheological Properties ◽

Rheological Behavior ◽

Apparent Viscosity ◽

Small Amplitude ◽

Flow Behavior ◽

Viscoelastic Behavior ◽

Dynamic Shear ◽

Small Amplitude Oscillatory Shear

Longan polysaccharide (LP) was extracted from longan (Dimocarpus longanLour.) pulp. The composition and rheological properties were determined by chemical analysis and dynamic shear rheometer. The flow behavior and viscoelastic behavior of longan polysaccharide (LP) solution were investigated by steady shear and small amplitude oscillatory shear (SAOS) experiments, respectively. The result shows that the solution is a pseudoplastic flow in a range of shear rate (1–100 s−1). The rheological behavior of LP was influenced by cations such as Na+and Ca2+. With an increase of apparent viscosity,G′andG′′were accompanied by addition of Na+and Ca2+.

Download Full-text

Study of Rheological Behavior of Olive Oil Used as Biodegradable Lubricant

Oriental Journal Of Chemistry ◽

10.13005/ojc/370533 ◽

2021 ◽

Vol 37 (5) ◽

pp. 1248-1251

Author(s):

Ioana Stanciu

Keyword(s):

Experimental Data ◽

Olive Oil ◽

Rheological Behavior ◽

Dynamic Viscosity ◽

Correlation Coefficients ◽

Exponential Fitting ◽

Dependence Relations ◽

Biodegradable Lubricant ◽

Newtonian Behavior

In this article, based on experimental data, we obtained three dependence relations of dynamic viscosity versus temperature by polynomial and exponential fitting. The correlation coefficients have values close to unity which proves that the obtained relations accurately describe the non-Newtonian behavior of olive oil.

Download Full-text

Modeling of Shear Rheological Behavior of Uncured Rubber Melt

Applied Rheology ◽

10.1515/arh-2020-0111 ◽

2020 ◽

Vol 30 (1) ◽

pp. 130-137

Author(s):

Hengxiao Yang ◽

Qimian Mo ◽

Hengyu Lu ◽

Shixun Zhang ◽

Wei Cao ◽

...

Keyword(s):

Shear Rate ◽

Constitutive Model ◽

Incompressible Fluid ◽

Rheological Behavior ◽

Rheological Characteristics ◽

One Dimensional ◽

Ptt Model ◽

Rate Region ◽

Proposed Model ◽

Rheological Experiments

AbstractTo describe uncured rubber melt flow, a modified Phan–Thien–Tanner (PTT) model was proposed to characterize the rheological behavior and a viscoelastic one-dimensional flow theory was established in terms of incompressible fluid. The corresponding numerical method was constructed to determine the solution. Rotational rheological experiments were conducted to validate the proposed model. The influence of the parameters in the constitutive model was investigated by comparing the calculated and experimental viscosity to determine the most suitable parameters. The uncured rubber viscosity was 3–4 orders larger than that of plastic and did not have a visible Newtonian region. Compared with the Cross-Williams-Landel-Ferry (Cross-WLF) and original PTT models, the modified PTT model can describe the rheological characteristics in the entire shear-rate region if the parameters are set correctly.

Download Full-text

Investigation on the Rheological Behavior of Polyamide6/Montmorillonite Nanocomposites by Reactive Extrusion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.233-235.1998 ◽

2011 ◽

Vol 233-235 ◽

pp. 1998-2001 ◽

Cited By ~ 1

Author(s):

Ming Zhao ◽

Xiao Zhong Lu ◽

Kai Gu ◽

Xiao Min Sun ◽

Chang Qing Ji

Keyword(s):

Activation Energy ◽

Shear Stress ◽

Shear Rate ◽

Rheological Behavior ◽

Reactive Extrusion ◽

Shear Thinning ◽

Experimental Results ◽

Montmorillonite Nanocomposites

The rheological behavior of PA6/montmorillonite(MMT) by reactive extrusion was investigated using cone-and-plate rheometer. The experimental results indicated that PA6/MMT exhibited shear-thinning behavior. The shear stress of both neat PA6 and PA6/MMT increased with the increase in the shear rate. The reduction of the viscous activation energy with the increase of shear stress reflected PA6/MMT can be processed over a wider temperature.

Download Full-text

Influence of Fillers on the Viscosity Properties of One-Pack Polyurethane Sealants

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.410.605 ◽

2021 ◽

Vol 410 ◽

pp. 605-610

Author(s):

Kseniya A. Timakova ◽

Yuriy T. Panov ◽

Evgeniy A. Timakov

Keyword(s):

Shear Rate ◽

Dynamic Viscosity ◽

Sharp Increase ◽

Sharp Decrease ◽

Shear Forces ◽

Complex Orientation ◽

Developed Surface ◽

Mineral Fillers ◽

Constant Shear Rate ◽

Shape Of Particles

The paper investigates the effect of fillers on the viscosity properties of one-pack polyurethane sealants. It is noted that with the introduction of such mineral fillers as Mikarb, Midol, MTD2 chalk and aluminum hydroxide, the dynamic viscosity of the composition increases uniformly, while when filled with chemically precipitated Calofort SV chalk and MT-GShM talc, an abnormally sharp increase in viscosity is observed. Such an increase in viscosity for Calofort SV is explained by a highly developed surface, in contrast to other fillers. Talc is characterized by a plate-like shape of particles, which leads to a complex orientation of talc particles in the composition and shear difficulties.It was found that a sealant filled with chemically precipitated chalk has more than 100 pts. wt.(parts by weight), per 100 pts. wt. of the prepolymer under the influence of shear forces (at a constant shear rate) during the first 10 minutes of exposure, a sharp decrease in viscosity is observed, which is characteristic of thixotropic compositions, reaching a constant value after 5-10 minutes. After 10 minutes, the thixotropy of the sealant is restored. Talc does not impart thixotropic properties to the sealant composition.

Download Full-text