scholarly journals Deformation Curve Characteristics of Rapeseeds and Sunflower Seeds Under Compression Loading

2014 ◽  
Vol 45 (3) ◽  
pp. 180-186 ◽  
Author(s):  
M. Divišová ◽  
D. Herák ◽  
A. Kabutey ◽  
V. Šleger ◽  
R. Sigalingging ◽  
...  
Keyword(s):  
Deformation Characteristic ◽  
Compressive Force ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Sunflower Seeds ◽  
Oilseed Crops ◽  
Deformation Curves ◽  
Oil Flow ◽  
Increasing Function

Abstract The deformation curve characteristics of rapeseeds and sunflower seeds compressed using the equipment ZDM 50-2313/56/18 and varying vessel diameters (40, 60, 80, and 100 mm) were investigated. Maximum compressive force of 100 kN was applied on bulk oilseeds of rape and sunflower of measured height 20-80 mm and deformed at a speed of 60 mm∙min-1. The compression test using the vessel diameters of 40 and 60 mm showed a serration effect while the vessel diameters of 80 and 100 mm indicated an increasing function effect on the force-deformation characteristic curves. Clearly, the increasing function effect described the region with oil flow and that of serration effect described the region without any oil flow. However, it was observed that the serration effect could be due to the higher compressive stress inside the smaller vessel diameters (40 and 60 mm) compared to those with bigger vessel diameters (80 and 100 mm). Parameters such as deformation, deformation energy, and energy density were determined from the force-deformation curves dependency showing both increasing function and serration effect. The findings of the study provide useful information for the determination of specific compressive force and energy requirements for extracting maximum oil from oilseed crops such as rape and sunflower.

scholarly journals Deformation energy of Jatropha curcas L. seeds under compression loading

2014 ◽  
Vol 60 (No. 2) ◽  
pp. 68-74 ◽  
Author(s):  
A. Kabutey ◽  
D. Herák ◽  
O. Dajbych ◽  
M. Divišová ◽  
W.E. Boatri ◽  
...  
Keyword(s):  
Moisture Content ◽  
Jatropha Curcas ◽  
Compressive Force ◽  
Smooth Curve ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Wave Effect ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Function Smooth

The present research is a follow-up of the previous studies on mechanical behaviour of Jatropha curcas L. seeds under compression loading. The research describes in detail the deformation energy which was determined from the area under the force-deformation curve. The compression device ZDM 50-2313/56/18 with a chart recorder and pressing vessel of diameter 76 mm were used to record the force-deformation functions of varying moisture content between 8.46% and 36.50% w.b. of Jatropha curcas L. seeds. Under the force-deformation curve, three main descriptions namely the increasing function (smooth curve), wave-effect characteristics (serration effect) and whole area under the force-deformation curve were analysed. For each of the force-deformation curve descriptions, it was found that moisture content influenced the values of compressive force, deformation, deformation energy and seed hardness. Interestingly, the research findings conclude that moisture content is a primary factor contributing to the wave-effect characteristics on the force-deformation curve.  

scholarly journals Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

2012 ◽  
Vol 40 (2) ◽  
pp. 227 ◽  
Author(s):  
David HERAK ◽  
Abraham KABUTEY ◽  
Monika DIVISOVA ◽  
Tereza SVATONOVA
Keyword(s):  
Mechanical Behaviour ◽  
Compressive Force ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Brassica Napus L ◽  
Compression Loading ◽  
Point Position ◽  
Deformation Ratio ◽  
Jatropha Seeds ◽  
Jatropha Seed

The present study provides information about the comparison of mechanical behaviour of selected oil bearing crops namely rapeseeds (Brassica napus L.), sunflower seeds (Helianthus annus L.) and jatropha seeds (Jatropha curcas L.) under compression loading. In this research, the compression device ZDM 50 with a chart recorder and a pressing vessel with diameter 100 mm were used to determine the relationship between the magnitude of the pressing force and deformation characteristics of the oilseed crops pressed at initial height 80 mm. From the compression test, the amounts of true deformation, maximal deformation energy and compressive force of the pressed samples were calculated and also mathematical equations describing the limit deformation, maximal deformation ratio, energy ratio and oil point deformation ratio were determined. The oil point position on the deformation curve, that is, the first leakage of oil from the pressing vessel of the various oilseeds was determined and compared. Based on the measured amounts rapeseeds achieved the highest values followed by jatropha seed and then sunflower seed. The amount of deformation energy required for the seed deformation gives the indication the amount of energy needed for obtaining the oil from the seed. It was found that the measured amounts as well as the oil point position on the force-deformation curve of the pressed samples showed varying results due to the seeds physical and inherent characteristics.

Diagnostics of the location of damage to tubing oil well pipes

2019 ◽  
Vol 5 (4) ◽  
pp. 115-128
Author(s):  
Timur A. Ishmuratov ◽  
Rif G. Sultanov ◽  
Milyausha N. Khusnutdinova
Keyword(s):  
Fluid Motion ◽  
Oil Well ◽  
General Belief ◽  
Oil Flow ◽  
Specialized Equipment ◽  
Improving Accuracy ◽  
Analytical Expressions ◽  
Technical Measures ◽  
Quick Determination

The study is devoted to the mathematical description of the process of oil outflow in places of leakage of the tubing string, which allows a computer to locate a leakage in the tubing. The authors propose methodology for identifying defects in the tubing and determining the location of the leak. The uniqueness of this methodology lies in quick determination of the place of leakage without the use of specialists, sophisticated and specialized equipment. Mathematical modeling of oil flow in the tubing requires the apparatus of continuum mechanics. It is a general belief that the movement of oil in the pipe flows at low speeds due to its outflow from the hole. Using the general equations of mass and energy balance, the authors have obtained differential equations of fluid motion in a vertical pipe in the process of its outflow from the tubing and in the process of injection. Analytical expressions are the solution to these equations, as they can help in estimating the degree of damage and its location, as well as the feasibility of its eliminating. The results show that an increase in the leakage and injection times leads to improving accuracy of locating damage. Thus, when conducting various geological and technical measures (GTM) at the well, it is possible to assess the presence of leakage and its intensity when deciding on the repair of tubing.

The Domain of Portevin-Le Chatelier Effect in Al-3Mg Alloy

2021 ◽  
Vol 1016 ◽  
pp. 928-933
Author(s):  
Anna Mogucheva ◽  
Diana Yuzbekova ◽  
Yuliya Igorevna Borisova
Keyword(s):  
Cold Rolling ◽  
Strain Rate ◽  
Uniform Elongation ◽  
Deformation Curve ◽  
Strain Rates ◽  
Deformation Curves ◽  
Angular Pressing ◽  
Lower Strain ◽  
Chatelier Effect ◽  
General Deformation

An Al-3Mg (wt. %) alloy was studied after equal channel angular pressing and subsequent cold rolling. The mechanical behavior of the alloy in the temperature range from 223 K to 373 K (from –50°C to 125°C) at strain rates 2.1×10–1 – 5.2×10–5 s–1 was investigated. The analysis of stress-strain curves was performed to determine the conditions of manifestation of the Portevin – Le Chatelier (PLC) effect in investigated alloy. The deformation curve at a temperature of 298 K (25°C) and a strain rate of 1×10–3 s–1 is characterized by instability of plastic flow in contrast to the deformation curves obtained under other studied strain rate/temperature conditions. Stress oscillations at the necking stage were observed at high temperatures (>323 K (50°C)) and lower strain rates (1×10–4 s–1 and 5.2×10–5 s–1) forming the left border of the PLC effect domain. In general, deformation curves are characterized by the absence of stress serrations during the uniform elongation.

scholarly journals Determination of Peroxide Value in Sunflower Halva using a Spectrophotometric Method

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Vlad MURESAN ◽  
Sevastita MUSTE ◽  
Emil RACOLTA ◽  
Cristina Anamaria SEMENIUC ◽  
Simona MAN ◽  
...  
Keyword(s):  
Peroxide Value ◽  
Room Temperature ◽  
Lipid Fraction ◽  
Ammonium Thiocyanate ◽  
Storage Conditions ◽  
Complexing Agent ◽  
Root Extract ◽  
Sunflower Seeds ◽  
The One

Sunflower halva, popular in countries from Eastern Europe, is made of sunflower tahini, cooked sugar and soapwort root extract. Lipid fraction in traditional sunflower halva is rich in polyunsaturated fatty acids, susceptible to peroxidation. Oxidation of the lipids is one of the main causes of lipid rich food deterioration leading to formation of off-flavour that negatively affect their quality and shelf life. In this study the initially phase of oxidation in sunflower halva was assessed, using as indicator the peroxide value (PV). The protocol followed was the one described by IDF standard which uses ammonium thiocyanate as Fe(III)-complexing agent. Halva samples stored at room temperature, in open air conditions for four months, respectively ten months were analyzed. The PV of sunflower halva at 10 months of storage was ~ 2 times higher that the PV of sunflower halva at 4 months of storage. The samples of sunflower seeds used for the analysis were freshly dehulled and dehulled and then stored at room temperature in open air conditions for four months. The freshly dehulled sunflower seeds had a PV of 4.14 meq O2/Kg fat, similar values with those reported in the literature. The sunflower seeds dehulled and than stored for 4 months at room temperature in open air conditions had a PV of 89.47 meq O2/Kg fat, rancid taste being detected. Regarding the oxidative stability of sunflower halva, care must be taken on storage conditions and packaging – temperature and oxygen availability. For further studies addition of supplementary antioxidants should be considered.

scholarly journals Mathematical simulation of temperature influence on pressure drop at pump suction line

2019 ◽  
Vol 213 ◽  
pp. 02069
Author(s):  
Tomáš Polášek ◽  
Adam Bureček ◽  
Lumír Hružík
Keyword(s):  
Pressure Drop ◽  
Physical Properties ◽  
Mathematical Simulation ◽  
Flow Rate ◽  
Experimental Measurement ◽  
Mineral Oil ◽  
Temperature Influence ◽  
Oil Flow ◽  
Suction Line

The article is focused on mathematical simulation of the temperature influence on the pressure drop at the pump suction line. It is evaluated pressure drop depending on mineral oil flow rate. The courses of individual dependencies are determined by mathematical simulation using the ANSYS CFD computing software. The temperature affects significantly physical properties of the flowing mineral oil. In a paper is also described the experimental measurement of a mineral oil sample and determination of its physical properties depending on temperature.

An Experimental Analysis of Misalignment Effects on Hydrodynamic Plain Journal Bearing Performances

2001 ◽  
Vol 124 (2) ◽  
pp. 313-319 ◽  
Author(s):  
J. Bouyer ◽  
M. Fillon
Keyword(s):  
Film Thickness ◽  
Journal Bearing ◽  
Hydrodynamic Pressure ◽  
Operating Conditions ◽  
Temperature Fields ◽  
Maximum Pressure ◽  
Minimum Film Thickness ◽  
Oil Flow ◽  
Hydrodynamic Effects

The present study deals with the experimental determination of the performance of a 100 mm diameter plain journal bearing submitted to a misalignment torque. Hydrodynamic pressure and temperature fields in the mid-plane of the bearing, temperatures in two axial directions, oil flow rate, and minimum film thickness, were all measured for various operating conditions and misalignment torques. Tests were carried out for rotational speeds ranging from 1500 to 4000 rpm with a maximum static load of 9000 N and a misalignment torque varying from 0 to 70 N.m. The bearing performances were greatly affected by the misalignment. The maximum pressure in the mid-plane decreased by 20 percent for the largest misalignment torque while the minimum film thickness was reduced by 80 percent. The misalignment caused more significant changes in bearing performance when the rotational speed or load was low. The hydrodynamic effects were then relatively small and the bearing offered less resistance to the misalignment.

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