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International Journal of Science and Engineering (IJSE)

ijse
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Published by Universitas Diponegoro

ISSN : - EISSN : - DOI : -

Core Subject : Engineering,

Engineering

The scope of journal covers all area in the application on chemical, physical, mathematical, biological, agricultural, corrossion, and computer science to solve the engineering problems.

Arjuna Subject : -

Articles 225 Documents

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Pelletisation Behavior of Fluxed Iron Ore Pellets of Varying Basicities Made with Waste Fines Alok Sarkar; Arup Kumar Mandal; O. P. Sinha
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

The present study deals with the utilization of fines generated from comminution process (crushing, grinding and screening) of the Run of Mines into value added products i.e. fluxed iron ore pellets. The study comprises to understand the physical and mechanical behavior of five distinguished chemical compositions of green and dried iron ore pellets with respect to a typical Mini Blast furnace (MBF) burden data and furnace operating parameter. The maximum basicity of pellets was calculated 2.37 to make slag neutral when blast furnace runs at 100% high ash coke (avg. ash content= 29%). The crushing strength and drop number of various green pellets were measured. Green Crushing Strength was decreased with increasing lime fines. The addition of lime fines as a burnt lime, which has acicular structure creates less plasticity and brittle like fracture occurred. Due to formation of hard CaCO3 layer on the surface, after increasing lime contain crushing strength was increased in the air and oven dry pellets with respect to acid pellet (0% lime fines addition). [How to cite this article: Sarkar, A., Mandal, A.K., and Sinha, O.P. (2013) Pelletisation Behavior of Fluxed Iron Ore Pellets of Varying Basicities Made with Waste Fines. International Journal of Science and Engineering, 5(2),9-14. Doi: 10.12777/ijse.5.2.9-14]

Take Advantage of Wasteful Batang Hari Irrigation For Electricity Services Improvement Bambang Istijono; Abdul Hakam
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

This paper describes the Batang Hari Irrigation prospect to meet the electricity needs in its surrounding area in order to increase the electrical service for every level society. The use of Batang Hari irrigation is far from its capacity. Un-used water and infrastructures from Batang Hari irrigation can be used to generate hydro-electric. Based on the results of this study, it can be concluded that the Batang Hari Irrigation can be used to generate electricity power up to 1.6 MW. This hydro power service can increase the level of electric service in West Sumatra Province more than 1%

Corrosion Behavior of Ni3(Si,Ti) + 2Mo in Hydrochloric Acid Solution Gadang Priyotomo; Pius Sebleku
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The corrosion behavior of Ni3(Si,Ti) + 2Mo intermetallic compound (L12 and (L12 + Niss) mixture region) has been investigated using an immersion test, polarization method and surface analytical method (scanning electron microscope and energy-dispersive X-Ray spectrometry) in 0.5 kmol/m3 hydrochloric acid (HCl) solution at 303 K. In addition, the results obtained were compared to those of the L12 single-phase Ni3(Si,Ti) intermetallic compound and C 276 alloy. It was found that Ni3(Si,Ti) + 2Mo had the preferential dissolution of L12 with a lower Mo concentration compared to (L12 + Niss) mixture region. From the immersion test and polarization curves, Ni3(Si,Ti) + 2Mo and C276 showed the lowest corrosion resistance and the highest corrosion resistance in the solution, respectively. From this work, It implied that unlike C276, Ni3(Si,Ti) +2Mo intermetallic compound was difficult to form a stable passive film in HCl solution as well as Ni3(Si,Ti) in the same solution.

Submission Information editor support
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

Submission Information

Pitting Corrosion of Ni3(Si,Ti)+2Cr Intermetallic Compound at Various Chloride Concentrations Gadang Priyotomo; Pius Sebleku; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The pitting corrosion of Ni3(Si,Ti) with 2 at% Cr containing two regions of a Ni3(Si,Ti) single-phase of L12 structure and a mixture phase of of (L12 +Niss) was investigated as function of chloride concentrations by using a polarization method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K. The pitting corrosion of Ni3(Si,Ti) with and without the addition of aluminium and type C276 alloy were also studied under the same experimental condition for the comparison. The pitting potential obtained for the Ni3(Si,Ti) with 2 at% Cr decreased with increasing chloride concentration. The specific pitting potentials and the pitting potentials were decreased in the order of C276 alloy > Ni3(Si,Ti) > Ni3(Si,Ti) + 2Cr > Ni3(Si,Ti) + 4Al, which means that the pitting corrosion resistance of Ni3(Si,Ti) with 2 at% Cr was higher than Ni3(Si,Ti) with 4 at% Al, but lower than that of Ni3(Si,Ti). A critical chloride concentration of Ni3(Si,Ti) with 2 at% Cr was found to be higher than that of Ni3(Si,Ti) with at% Al. In addition, the presence of high concentration for oxygen indicates the occurrence of pit formation.

List of Content, Editorial Board, Preface editor support
International Journal of Science and Engineering Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

List of Content, Editorial Board, Preface

DRYING KINETICS MODELLING OF TARAP (ARTOCARPUS ODORATISSIMUS) Heng Jin Tham; Jau Shya Lee
International Journal of Science and Engineering ARTICLE IN PRESS
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12777/ijse.0.0.

The effects of temperatures, 50˚C, 60˚C and 70˚C on the drying behaviour of tarap slices were experimentally investigated. High drying temperature resulted in shorter drying time and higher drying rate. Results show that the drying of tarap slices occurred at falling rate period. The effective moisture diffusivity increases from 1.216 to 2.432 × 10-11 m2/s with the increase in drying temperature. The activation energy of tarap is found to be 32 kJ/mol and the constant diffusivity is 1.969 × 10-6 m2/s. As for the modelling of drying kinetics, three statistical parameters namely coefficient of determination, reduced chi-square and root means square error were determined, and Midilli-Kucuk model was found to be the most suitable for describing the drying curves of tarap slices.

Correlation Equations of Heat Transfer in Nanofluid Al2O3-Water as Cooling Fluid in a Rectangular Sub Channel Based CFD Code Anwar Ilmar Ramadhan; As Natio Lasman; Anggoro Septilarso
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

Safety is a major concern in the design, operation and development of a nuclear reactor. One aspect of nuclear reactor safety factor is thermal-hydraulics aspect. In a PWR-type nuclear power plant has been used lighter fluid coolant is water or H2O. In this research, using nanofluid Al2O3-Water with volume fraction of (1%), (2%) and also (3%), used as a cooling fluid in a nuclear reactor core with sub channel PWR fuel element rectangular arrangement. This research was carried out modeling of fuel elements are arranged rectangular, then performed numerical simulations using Computational Fluid Dynamics (CFD) code. In order to obtain the characteristic pattern of flow velocity of each fluid, the fluid temperature distribution along the cylinder wall temperature distribution of the fuel element. Then analyzed the heat transfer in a nuclear reactor core with sub channel PWR fuel element rectangular arrangement, including heat transfer coefficient, Nusselt number (Nu), as well as heat transfer correlations. Heat transfer correlation for nanofluid Al2O3-Water (1%), (2%) and also (3%) proved to core of PWR nuclear reactor fuel element sub channel rectangular arrangement with the Reynolds number (Re) is stretched, namely: 404 096 <Re <423 084 and with constant heat flux is 2600 W / m2, and the composition ratio (pitch / diameter) 1.33.

Alternative Fiber Sources from Gracilaria Sp and Eucheuma Cottonii for Papermaking M. Nizar Machmud; Fauzan Fadi; Zahrul Fuadi; Coco Kokarkin
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Private sectors have invested in the technology to grow some Gelidialian red algae families and also tried to convert the algae to pulp and paper over the last few years in order to replace raw materials from wood. Several modern systems with their all complexities which are similar to the wood pulp-based papermaking technology have been offered to overcome any recent issues settle in the converting process. Chemical bleaching agents have even been still a standard treatment that must be established for properly converting the algae pulp to a sheet of paper. In this present work, the two genus of red algae, called Gracilaria and Eucheuma, were simply processed to make pulps without use of any bleaching chemical agents. The potential use of pulps made of the red algae as raw materials for papermaking was mechanically studied by testing the sheets made of the red algae through a tensile test at a room temperature under 20 mm/min according to ASTM D 828-97 (2002). Tensile properties of the proposed algae-based paper sheets obtained under the constant rate are discussed. Tensile properties of the selected wood-based paper sheets obtained under the same condition are also presented in this paper. The results showed that pulps made of the red algae would be the alternative to those of the wood and other natural fibers as raw materials for papermaking. Doi: 10.12777/ijse.6.1.1-10 [How to cite this article: Arham, N.A., Mohamad, N.A.N., Jai, J., Krishnan, J., Noorsuhana Mohd Yusof, N.M. (2013). Application of Response Surface Methodology in Extraction of Bioactive Component from Palm Leaves (Elaeis guineensis). International Journal of Science and Engineering, 6(1),1-10. Doi: 10.12777/ijse.6.1.1-10

Measurement of cement’s particle size distribution by the buoyancy weighing-bar method Rondang Tambun; Nofriko Pratama; Farida Hanum
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

One of the important characteristics of cement quality is particle size distribution. There are several simple methods to measure the particle size distribution of cement based on the Stokes diameter, like Andreasen pipette method, sedimentation balance method, centrifugal sedimentation method, etc. A major disadvantages of these methods are they are time consuming process and require special skills. Particle size distribution also can be analyzed by using a different principle through microscopy, laser diffraction/scattering methods and Coulter counter method. Even these methods produce highly accurate results within a shorter time, however, the equipments are expensive. In the present study, it has developed a new method to overcome the problem. The method is the buoyancy weighing-bar method. This method is a simple and cost-effective. The principle of the buoyancy weighing-bar method that the density change in a suspension due to particle migration is measured by weighing buoyancy against a weighing–bar hung in the suspension, and the particle size distribution is calculated using the length of the weighing-bar and the time–course change in the the apparent mass of the weighing–bar. This apparatus consists of an analytical balance with a hook for underfloor weighing, and a weighing–bar, which is used to detect the density change in suspension. The result obtained show that the buoyancy weighing–bar method is suitable for measuring the particle size distribution of cement, and the result is comparable to that of determined by settling balance method.

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