scholarly journals Estimation of Energy Requirement of Jatropha Curcas L. Seedcake Briquettes under Compression Loading

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1980 ◽  
Author(s):  
Tatiana Ivanova ◽  
Abraham Kabutey ◽  
David Herák ◽  
Cimen Demirel
Keyword(s):  
Mechanical Behaviour ◽  
Jatropha Curcas ◽  
Energy Requirement ◽  
Testing Machine ◽  
P Value ◽  
Force Coefficient ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Deformation Curves ◽  
Deformation Coefficient

The energy requirement of Jatropha curcas L. seedcake of different dimensions (4.5, 5.6, 6.7, 8 and 10 mm) for briquette compaction was investigated under compression loading (100, 200, 300 and 400 kN) using the universal compression-testing machine. The parameters measured and/or calculated were the deformation, thickness, numerical energy and theoretical energy. The statistical analysis results show that compression forces had a significant effect (P-value < 0.05) on the amounts of deformation and thickness, while that of the dimensions of the sample did not. The increase in compression forces increased the numerical energy while that of samples dimensions caused a decrease. Using the tangent curve mathematical model; the force coefficient of mechanical behaviour (kN), the deformation coefficient of mechanical behaviour and the fitting curve function exponent were determined for describing the experimental dependency between the force and deformation curves as well as the numerical energies of densified jatropha seedcake briquettes.

Mathematical model of mechanical behaviour of Jatropha curcas L. seeds under compression loading

2013 ◽  
Vol 114 (3) ◽  
pp. 279-288 ◽  
Author(s):  
David Herak ◽  
Abraham Kabutey ◽  
Monika Divisova ◽  
Satya Simanjuntak
Keyword(s):  
Mathematical Model ◽  
Mechanical Behaviour ◽  
Jatropha Curcas ◽  
Compression Loading ◽  
Jatropha Curcas L

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. &nbsp;

scholarly journals Tangent Curve Function Description of Mechanical Behaviour of Bulk Oilseeds: A Review

2015 ◽  
Vol 45 (4) ◽  
pp. 259-264 ◽  
Author(s):  
R. Sigalingging ◽  
D. Herák ◽  
A. Kabutey ◽  
M. Čestmír ◽  
M. Divišová
Keyword(s):  
Mathematical Model ◽  
Mechanical Behaviour ◽  
Deformation Characteristic ◽  
Theoretical Description ◽  
Force Coefficient ◽  
Curve Approximation ◽  
Marquardt Algorithm ◽  
Volume Energy ◽  
Deformation Coefficient ◽  
Linear Compression

Abstract The application of tangent curve mathematical model for description of mechanical behaviour of selected bulk oilseeds, namely jatropha, sunflower, rape, garden pea, and common bean in linear compression was reviewed. Based on the review analysis, the tangent curve function has been developed using MathCAD 14 software which employs the Levenberg-Marquardt algorithm for data fitting optimal for tangent curve approximation. Linear compression parameters including force (N), deformation (mm), energy (J), and/or volume energy (J-m-3) can equally be determined by the tangent model. Additionally, the theoretical dependency between force and deformation characteristic curves can be defined by the force coefficient of mechanical behaviour (N) and deformation coefficient of mechanical behaviour (mm-1) of the tangent model. In conclusion, the review results, however, shows that the tangent curve mathematical model which is dependent on experimental boundary conditions is potentialy useful for theoretical description of mechanical properties and deformation characteristics of bulk oilseeds in axial compression.

scholarly journals Behaviour of different moisture contents of Jatropha curcas L. seeds under compression loading

2011 ◽  
Vol 57 (No. 2) ◽  
pp. 72-77 ◽  
Author(s):  
A. Kabutey ◽  
D. Herák ◽  
A. Sedláček
Keyword(s):  
Moisture Content ◽  
Jatropha Curcas ◽  
Unit Volume ◽  
Minimum Energy ◽  
Deformation Characteristic ◽  
Deformation Energy ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Moisture Contents ◽  
Jatropha Seeds

A study was conducted to investigate the behaviour of different moisture contents of Jatropha curcas L. seeds under compression loading. To obtain jatropha seeds of different moisture contents ranging from 1% (w.b.) to 37% (w.b.), the seeds were soaked in water and kept in a refrigerator at 5&deg;C for different number of days. Compression devices, namely ZDM 50-2313/56/18, pressing vessel with diameter of 76 mm and a pressing plunger of 90 mm height, were used. The amount of seeds in the pressing vessel was measured as 40 mm with compression force of 98,100 N. The results from the experiment showed that increasing the moisture content of the jatropha seeds influenced the force-deformation characteristic curve, deformation energy, maximum deformation and energy per unit volume. While moisture contents 1% (w.b.) and 10% (w.b.) displayed normal force-deformation characteristic, moisture contents 32% (w.b.) and 37% (w.b.) showed wave-effect characteristic. The R<sup>2</sup> coefficient of determination value of 0.87 obtained from the effect of moisture content on deformation energy and unit volume energy shows that jatropha seeds of moisture content 16% (w.b.) would require minimum energy but high efficiency during compression.

Relaxation behaviour of Jatropha curcas L. bulk seeds under compression loading

2014 ◽  
Vol 125 ◽  
pp. 17-23 ◽  
Author(s):  
David Herak ◽  
Abraham Kabutey ◽  
Michal Petru ◽  
Petr Hrabe ◽  
Petr Lepsik ◽  
...  
Keyword(s):  
Jatropha Curcas ◽  
Relaxation Behaviour ◽  
Compression Loading ◽  
Jatropha Curcas L

Effect of compression speed on energy requirement and oil yield of Jatropha curcas L. bulk seeds under linear compression

2015 ◽  
Vol 136 ◽  
pp. 8-13 ◽  
Author(s):  
Abraham Kabutey ◽  
David Herák ◽  
Rostislav Chotěborský ◽  
Riswanti Sigalingging ◽  
Čestmír Mizera
Keyword(s):  
Jatropha Curcas ◽  
Energy Requirement ◽  
Oil Yield ◽  
Jatropha Curcas L ◽  
Compression Speed ◽  
Linear Compression

Pertumbuhan Beberapa Genotipe Jarak Pagar (Jatropha Curcas L.) di Tanah Masam

2017 ◽  
Vol 5 (2) ◽  
pp. 251-263
Author(s):  
Indah Retnowati ◽  
Memen Surahman
Keyword(s):  
Jatropha Curcas ◽  
Jatropha Curcas L

Indonesia memiliki banyak  tanah masam, tetapi penggunaan masih sangat sedikit karena kandungan nutrisi tanah masam rendah. Sementara itu, jarak pagar merupakan tanaman yang dapat tumbuh di berbagai jenis tanah (termasuk lahan marjinal) dan penggunaannya sebagai bahan baku biodiesel. Oleh karena itu, perlunya penelitian mengenai pertumbuhan jarak pagar pada tanah masam sebagai upaya untuk mengembangkan jarak pagar dan penggunaannya di Indonesia.Untuk memulai upaya, penelitian tentang berbagai genotipe jarak pagar di tanah masam telah dilakukan. Tujuan dari penelitian ini yaitu mempelajari genotipe jarak pagar  yang berpotensi untuk tanah masam. Penelitian ini dilakukan di UPTD Pengembangan Teknologi Lahan Kering Singabraja, Kecamatan Tenjo, Bogor, Jawa Barat, dari November 2010-Agustus 201. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor yaitu genotipe. Hasil penelitian menunjukkan berbagai perbedaan pada pertumbuhan diantara genotipe-genotipe jarak pagar. Secara umum, ada lima genotipe jarak pagar yang terbaik di tanah masam (pH 5.0) yaitu Medan I-5-1, Dompu, IP-2P-3-4-1, Sulawesi, dan Bima M.

Sign in / Sign up

Export Citation Format

Share Document