scholarly journals The Influence of Non-Newtonian Property on the Apparent Viscosity Measured by Single Cylinder Rotational Viscometer (Type-B Viscometer)

2009 ◽  
Vol 46 (12) ◽  
pp. 873-880 ◽  
Author(s):  
Kazuki Asai ◽  
Masaaki Ichiyanagi ◽  
Hiroshi Satone ◽  
Takamasa Mori ◽  
JunIchiro Tsubaki ◽  
...  
Keyword(s):  
Apparent Viscosity ◽  
Type B ◽  
Rotational Viscometer ◽  
Single Cylinder

Rheological Properties of Aircraft Grease Containing Nano-Additives

2009 ◽  
Vol 419-420 ◽  
pp. 53-56
Author(s):  
Bao Yu Song ◽  
Qing Xiang Yang ◽  
Feng Zhang ◽  
Dai Zhong Su
Keyword(s):  
Rheological Properties ◽  
Apparent Viscosity ◽  
Shear Thinning ◽  
Nano Particles ◽  
Rheological Parameters ◽  
Nanoparticle Concentration ◽  
Rotational Viscometer ◽  
Shear Rates ◽  
The One ◽  
The Given

The apparent viscosity of aircraft grease with different nano-particles content, temperature and shear rates were studied using a rotational viscometer. The rheological properties of two types of aircraft grease, the basic grease and the one with nano-particles additives, were investigated using a rheometer. The results indicated that the apparent viscosity increases with the increase of nanoparticle concentration with the given ratio of nano-particles added. It was also found that the grease with and without the nano-particles both have yield stresses and clear shear-thinning properties. The shear-thinning phenomenon of the grease containing nano-particles is more evident than that of the basic grease. The experimental results also reveal that the rheological characteristics of both types of grease fall in Herschel-Bulkley class, and the nano-particles have a significant influence on the rheological parameters. At the end, the rheology mechanism was discussed based on the entanglement and orientation theories.

Effect of temperature and concentration on density and rheological properties of melon (Cucumis melo L. var. Inodorus) juice

2014 ◽  
Vol 44 (2) ◽  
pp. 168-178 ◽  
Author(s):  
Ali Mohamadi Sani ◽  
Ghazaleh Hedayati ◽  
Akram Arianfar
Keyword(s):  
Experimental Data ◽  
Shear Stress ◽  
Apparent Viscosity ◽  
Flow Behavior ◽  
Effect Of Temperature ◽  
Plastic Behavior ◽  
Linear Quadratic ◽  
Concentric Cylinder ◽  
Rotational Viscometer ◽  
Content Type

Purpose – The aim of this study was to measure the apparent viscosity, flow behavior and density of melon juice as a function of temperature and juice concentration and to obtain simple equations to correlate experimental data. Design/methodology/approach – Melon juice was concentrated in a rotary evaporator to 40±1, 52.5±1 and 65±1°Brix at 50°C, 80 rpm and stored at 4°C until analysis. Density of melon juice was determined with 25 ml pycnometer at 15, 25 and 35°C and was expressed as kg/m3. All experiments were conducted in triplicate. Experimental data were fitted to different models (linear, quadratic, exponential, quadratic exponential and polynomial) using Minitab 16. Significant differences in the mean values were reported at p<0.05. The flow behavior of melon juice was determined using a concentric cylinder rotational viscometer at shear rate range of 13.2-330 s−1 and temperatures of 15, 25 and 35°C. The experimental data were analyzed Slide Write V7.01 Trial Size (p<0.05) and the rheograms was plotted by Microsoft Excel 2007. Findings – Results showed that the four-term polynomial model is the best model for computing density values from temperature and concentration (R2=0.999). The measured shear stress was within 1.69-780 Pa, corresponding to viscosity range of 0.016-0.237 Pa · s. Within the tested conditions, the concentrate exhibited a pseudo plastic behavior. Temperature had an inverse effect on shear stress and apparent viscosity. Originality/value – No research had been done on production of melon juice concentrate.

scholarly journals Contribution to the Physical Stability Study of Compounded Medications Based on Zinc Oxide, Titanium Dioxide and Precipitated Sulfur Using Emulsified Solid Fats as Vehicles

2020 ◽  
Vol 5 (2) ◽  
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Apparent Viscosity ◽  
Physical Stability ◽  
Stability Study ◽  
Stearyl Alcohol ◽  
Rotational Viscometer ◽  
Solid Fat ◽  
Sediment Volume ◽  
Selection Of

Background: This investigation evaluated the physical stability of zinc oxide, precipitated sulfur and titanium dioxide suspensions using three solid fats as emulsified vehicles: stearyl alcohol, stearic acid and beeswax. Method: Varying the concentration of solid fat (2%, 4%, 6%) and the agitation speed for the preparation of the emulsified vehicle (250, 500 and 750 rpm). Here 81 suspensions were prepared, 27 for each solid fat used. The apparent viscosity was measured using a Brookfield RVTD rotational viscometer. The selection of revolutions per minute and spindle used in the viscometer was carried out taking into account the need to obtain a reading in the instrument greater than 10.0, in accordance with the recommendation of the equipment manufacturer. The sediment volume was measured using identical graduated bottles. Results: The effects that were studied as indicators of the physical stability of the suspensions were: sediment volume, apparent viscosity and ease of resuspension. This analysis indicated that the selection of the solid fat is a parameter significantly influential, which supports the data obtained through the investigation. Higher sediment volumes were obtained by increasing the concentration of the emulsified fat and increasing the speed of agitation, favoring thixotropic behavior in suspensions. Conclusion: In terms of physical stability and ease of resuspension, the best results were obtained when emulsified stearyl alcohol was used as a vehicle.

Characterization of Cellulose Nanocrystal Suspension Rheological Properties Using a Rotational Viscometer

2021 ◽  
Vol 71 (3) ◽  
pp. 290-297
Author(s):  
Yucheng Peng ◽  
Changlei Xia ◽  
Brian Via
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Power Law ◽  
Apparent Viscosity ◽  
Flow Behavior ◽  
Cellulose Nanocrystal ◽  
Rotational Viscometer ◽  
Spindle Rotation ◽  
Quality Control Tool ◽  
Calculation Results

Abstract Interest in cellulose nanocrystal (CNC) recently has been growing significantly. Many applications have been developed for CNC and appropriate procedures to handle the CNC suspensions are critical for these applications. In this study, we explored a method evaluating CNC suspensions based on rheological property characterization. We used a rotational viscometer to characterize CNC suspensions at concentrations of 3, 4, 5, and 6 wt.%. We collected primary readings from the rotational viscometer, including spindle rotation speed and torque, to generate apparent viscosity and shear rate for CNC suspensions. We applied three different methods summarized from the literature to calculate apparent viscosity and real shear rate. We critically analyzed differences among calculation results from the three methods. Shearing thinning behaviors obeyed the power law flow model for all CNC suspensions in the shear rate tested. At different concentrations, consistency and flow behavior indices in the model differed in the measured shear rate range. With the same shear rate, higher concentration CNC suspension had a higher apparent viscosity. The apparent viscosity of the CNC suspension was associated with its weight concentration in a power law relationship. This study indicated that a rotational viscometer can be used as a quality control tool for characterizing the rheological properties of the CNC suspensions. We made recommendations for using appropriate calculation methods to obtain shear rate and apparent viscosity of CNC suspensions from the primary readings of a rotational viscometer under different situations.

Rheological Property of Sodium Alginate-Agar-Montmorillonite Ternary Solution

2014 ◽  
Vol 900 ◽  
pp. 357-360
Author(s):  
Nan Song Ma ◽  
Su Juan Pang ◽  
Nai Xu ◽  
Li Sha Pan ◽  
Guang Mao Li ◽  
...  
Keyword(s):  
Rheological Property ◽  
Rheological Properties ◽  
Sodium Alginate ◽  
Apparent Viscosity ◽  
Rotation Speed ◽  
Solution Temperature ◽  
Ternary Solution ◽  
Micro Structure ◽  
Rotational Viscometer

The rheological properties of sodium alginate (SA)/agar (AR)/montmorillonite (MMT) solutions were investigated using a rotational viscometer. The dependence of solution apparent viscosity on rotation speed, MMT proportion and solution temperature were researched systematically. Furthermore, the relation of apparent viscosity and micro-structure of the ternary solution was also discussed.

Biological and Morphological Studies on Low-Leukemia-Strain Mice with Hodgkin's-Like Neoplasia Induced by Serial Cell-Free Transmission of Leukemic Organs of SJL/J Strain Mice

1968 ◽  
Vol 26 ◽  
pp. 210-211
Author(s):  
S. Fujinaga ◽  
K. Maruyama ◽  
C.W. Williams ◽  
K. Sekhri ◽  
L. Dmochowski
Keyword(s):  
Tissue Culture ◽  
Type A ◽  
Reticulum Cell ◽  
Type B ◽  
Viral Origin ◽  
Serial Transfer ◽  
Strain Mouse ◽  
Morphological Studies ◽  
Cell Neoplasm ◽  
Free Material

Yumoto and Dmochowski (Cancer Res.27, 2098 (1967)) reported the presence of mature and immature type C leukemia virus particles in leukemic organs and tissues such as lymph nodes, spleen, thymus, liver, and kidneys of SJL/J strain mice with Hodgki's-like disease or reticulum cell neoplasm (type B). In an attempt to ascertain the possibility that this neoplasia may be of viral origin, experiments with induction and transmission of this neoplasm were carried out using cell-free extracts of leukemic organs from an SJL/J strain mouse with spontaneous disease.It has been possible to induce the disease in low-leukemia BALB/c and C3HZB strain mice and serially transfer the neoplasia by cell-free extracts of leukemic organs of these mice. Histological examination revealed the neoplasia to be of either reticulum cell-type A or type B. Serial transfer is now in its fifth passage. In addition leukemic spleen from another SJL/J strain mouse with spontaneous reticulum cell neoplasm (type A) was set up in tissue culture and is now in its 141st serial passage in vitro. Preliminary results indicate that cell-free material of 39th tissue culture passage can reproduce neoplasia in BALB/c mice.

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