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All Journal Agrointek Rekayasa Mesin Sinergi JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) International Journal of Innovation in Mechanical Engineering and Advanced Materials
Sundari, Rita
Universitas Mercu Buana
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Journal : Sinergi

 1 
FIBERGLASS CIRCULAR TURBULATOR IN COUNTER FLOW DOUBLE PIPE HEAT EXCHANGER: A STUDY OF HEAT TRANSFER RATE AND PRESSURE DROP Sudiono Sudiono; Rita Sundari; Rini Anggraini
SINERGI Vol 25, No 1 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2021.1.007

Abstract

This preliminary investigation studied the effect of circular turbulator vortex generator on heat transfer rate and pressure drop in a circular channel countercurrent double pipe heat exchanger with water working fluid. Increasing the number of circular turbulator yielded increasing heat transfer rate and pressure drop. The problem generated when increased pressure drop occurred in relation to more energy consumption of the water pumping system. Therefore, optimization in circular turbulator number is necessary to minimize the pressure drop about distance length between circular turbulator, tube diameter and thickness, type of material and crystal lattice, as well as the geometrical shape of fluid passage (circular or square). This study applied PVC outer tube and copper alloy inner tube, as well as fiberglass circular turbulator. The optimum results showed that seven parts of circular turbulator increasing heat transfer rate by 30% and pressure drop by 80% compared to that passage in the absence of circular turbulator at cool water debit of 7 L/min.
CHLORIDE SENSOR FABRICATION BASED ON SPE Ag/AgCl THROUGH CYCLIC VOLTAMMETRIC TECHNIQUE: SCAN RATE EFFECT Mas'ud Asadullah; Sagir Alva; Ali Rinaldi; Rita Sundari
SINERGI Vol 25, No 3 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2021.3.012

Abstract

The Cyclic Voltammetric (CV) technique is one of the Ag/AgCl fabrication processes. In electrochemical processes using this CV technique, the microstructure of the surface of a substrate or electrode can affect the scan rate. Thus, this study aims to identify the scan rate effect of the Cl-ion sensor fabrication process using the CV technique on the performance of the Cl-ion sensor. First, the CV process was carried out in one cycle to grow the AgCl layer on the Ag surface. Then, this process was carried out at varied scan rates of 20, 40, 60, 80, and 100 mV/s. After completing the Ag/AgCl fabrication process, it was followed by the characterization process, selectivity coefficient test, lifetime test, and validation test to compare the test results of the Cl SPE Ag/AgCl ion sensor with Ag/AgCl commercial. The results showed that the optimum Cl-ion sensor response was obtained at the scan rate of 60 mV/s. Then, based on the validation test, the Cl-ion in the two samples did not show significant differences. Therefore, it indicates that the SPE Ag/AgCl ion sensor has the same performance as the Ag/AgCl commercial.
Induced roll magnetic separator applied for high grade ilmenite separation from mining tailing Wiwik Dahani; Rita Sundari; Subandrio Somali; Irfan Marwanza; Andriyani Andriyani; Djoko Hartanto; Khuzaimah Arifin; Ratna Ediati
SINERGI Vol 27, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2023.2.015

Abstract

This article aimed to separate ilmenite (FeTiO3) mineral from tin tailing applying a single splitter IRMS (Induced Roll Magnetic Separator). Ilmenite mineral is the substantial main source for TiO2. This work used air table middling for feeding. The mineral components of middling feeding from air table using grain counting analysis were found as follows: cassiterite (48.61%), ilmenite (21.36%), monazite (18.56%), pyrite (4.60%), zircon (5.85%), quartz (0.71%), anatase (0.27%), and tourmaline (0.02%), It was found that electrical current and opening of single splitter affected the degree of separation addressing to ilmenite recovery and ilmenite grade. The finding showed that current of 15 Ampere and single splitter with opening 4.25 cm yielded ilmenite recovery more than 74%. The high grade ilmenite (90.46 %) and recovery of 29.38% was obtained using 5 Ampere  with single splitter opening of 1.0 cm. Up to date, the study on ilmenite separation from tailing only focused on the effect of current, however, the effect of single splitter magnetic separator  to enhance ilmenite recovery from other paramagnetic minerals such as monazite, siderite, xenotime and tourmaline has not yet been reported. 
Co-Authors Agus Sudarsono Aji Bagaskara Ali Rinaldi Ananda Putra Andriyani Andriyani Arifin, Khuzaimah Asadullah, Mas'ud Budhi Oktavia Darren, Franko Sajow Darwin Sebayang Djoko Hartanto Elisabeth Gultom Faisal Rachman Fajar Anggara Gian Villany Golwa Hans Martua Pardede Herdiyanto, Rizky B. Irfan Marwanza Irwansyah, Dandi Ivetta Ivetta Juliza Hidayati Juliza Hidayati Khuzaimah Arifin Kurniawati, Riskaviana Marwanza , Irfan Mas'ud Asadullah Nur Indah R. Ariosuko Ratna Ediati Reza Kamaludin Rinaldi, Ali Rini Anggraini Rini Anggraini Rini Anggraini Rini Anggraini, Rini Rosdanelli Hasibuan Rosdanelli Hasibuan Sagir Alva Salahudin Arif Sri Benti Etika Sri Teguh Priharti Subandrio Subandrio, Subandrio Subekti Subekti Sudiono Sudiono Sudiono Sudiono, Sudiono Umar Kalmar Nizar Vikram Alexander Wiwik Dahani Wiwik Dahani wiwik dahani, wiwik