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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 8 Documents
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Search results for , issue "Vol 20, No 1 (2022): February" : 8 Documents clear
The influence of height on the spreading distance of axisymmetric jets impinging on a rigid surface Luthfi Luthfi
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2437

Abstract

The influence of the domain height of negative buoyancy jets when impinging on a rigid surface has been investigated. The study was conducted numerically by applying the Computational Fluid Dynamics (CFD) method.  The numerical model consists of a set of Navier-Stokes equations together with an energy equation. The jet flow was modeled in a two-dimensional axisymmetric coordinate. The governing equations were solved in transient using the finite volume approach. The programming code for the numerical model was written in Fortran. The numerical simulations were run at Froude number Fr = 5.0; Reynolds number, Re = 200 and Prandtl number Pr = 7.0. The investigated parameter, the domain height was varied at around 8.8 ≤ H/X0 ≤ 10.2. The flow visualization created from simulation results has revealed the mystery behind the complex flow behavior in detail. Starting from the initial flow when the jet entered the domain to the complex flow pattern of the jet flow detaching from the top surface. Including when the downflow mixes with the upflow creating a recirculation area near the top surface and the bottom of the domain. The plot of the spreading distance over time shows that there is a maximum distance when the jet starts detaching from the top surface. Gradually, the distance decreases until reaching a fixed final distance when the jet flow reaches quasi-steady. The influence of the domain height that was investigated shows different flow patterns at different heights. The plot of final distances over the domain height shows that there is a nonlinear relationship. The regression equation created from the numerical data shows good agreement and accuracy.
Design of Natural Convection Solar Dryer for Coffee Beans with Monitoring System Based on Internet of Things Nurdin Nurdin; Irwin Syahri Cebro; Azhar Azhar; Hendrawati Hendrawati
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2613

Abstract

The process of monitoring the drying of coffee beans so far is still done traditionally so that the effectiveness of the drying process is still low. The IoT-based drying monitoring process is expected to provide better effectiveness and time efficiency. This research designs and manufactures a solar dryer with natural convection heat transfer for coffee beans equipped with an Internet of Things-based monitoring system. The purpose of this study is to develop the performance of a solar dryer with natural convection with the addition of an IoT-based monitoring unit. The research begins with a technical plan for the main components of the dryer. Components whose shapes, dimensions, and materials have been planned will be outlined in the form of detailed technical drawings. Detailed technical drawings will be a guide in the dryer manufacturing process. The main components of the dryer are solar collectors, drying chambers, and an IoT-based monitoring system. The solar collector will function to capture heat from the sun which will flow naturally into the drying room. An IoT-based monitoring system will capture the temperature and humidity (DFRobot DHT22 sensor) in the solar collector, drying room, and the environment of the dryer. In addition, a Bh1750 sensor to capture the intensity of the sun is also embedded in this monitoring system. This monitoring system will be connected to the internet network where the data will be sent to a cloud data server. The recorded data can then be downloaded using a mobile device or personal computer connected to the internet network. This IoT-based monitoring system was chosen so that performance data from the dryer can be monitored in real-time and online. The results of this study are a prototype dryer with a household capacity of 9 Kg equipped with an IoT-based monitoring system has been built and can be implemented properly
Optimization of the drilling campaign in reducing drilling cost in Block A Asset Ibnu Hafizh; Hasan Yudie Sastra; Irwansyah Irwansyah
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2546

Abstract

Drilling requires large costs with a very high risk of work, therefore good and careful planning is needed before it is carried out to obtain effective and efficient results by considering two aspects i.e. engineering and economics. Unstable conditions at the drilling site pose a high risk from the investor's point of view in terms of the total drilling costs that will be incurred in the area. The Platform drilling campaign implemented in Alur Siwah Phase 1 project is part of a project to increase gas recovery so that meets the gas raw materials demand in Aceh and the campaign is conducted using directional drilling technique. A descriptive method was used in the study and the data was gathered from the drilling activity reports during planning to post-drilling. Optimization using a drilling campaign during the drilling for the three wells in Alur Siwah Fase 1 resulted in a drilling cost savings of 26% and also saved execution time about 37 days from planning time
Experimental and Simulation Evaluation of Temperature and Air Flow in Tunnel-Type Dryers: Preliminary Study Akhyar Akhyar; Darwin Harun; Muhammad Robby; Muhammad Ilham Maulana; Ahmad Farhan
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2620

Abstract

Solar energy is a source of electricity for various industrial applications, such as water heating and drying. In the drying application, energy is transferred from one point to another due to the temperature difference of the sample material. This promoted the significant use of dryers by both farmers and fishermen to preserve their harvest or catch. However, there are several problems associated with the open system drying, such as inconsistent drying duration, dirt, fungus contamination, and rain. Therefore, this research aims to analyze heat transfer and airflow in the drying chamber of a tunnel-type application, using experimental and computational simulations. The general applied methods encompassed measuring the dryer’s in situ temperature, modeling the heat transfer, and analyzing the computational fluid dynamics(CFD) simulations for the airflow in the drying chamber between 08:00-15:30 GMT+7 (February 9, 2021). The temperature and airflow simulations of the system were analyzed and validated without a load of dried materials. Based on the measurement results, the minimum inlet and outlet temperatures occurred at 30.2oC (08.00 GMT+7) and 24ºC, similar to the simulation at 31.2ºC (08:00 GMT+7). Meanwhile, the maximum inlet and outlet temperatures were evaluated at 45.7 and 39ºC, with an outlet simulation temperature of 41.5ºC (12:00 GMT+7). These overall results indicated that the temperature values did not vary extensively. Therefore, the applied drying system is best suitable for post-harvest agricultural, forestry, and marine drying applications.
The simulation of heat transfers and flow characterization on wickless loop heat pipe Ainur Rosidi; Giarno Giarno; Dedy Haryanto; Nursinta Adi wahanani; Yoyok Dwi Setyo Pambudi; Mukhsinun Hadi Kusuma
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2497

Abstract

The severe accident at a nuclear power plant in Japan became an important lesson for aggressively involving passive cooling systems to improve safety. One of the passive cooling system technologies with excellent heat dissipation capabilities and great potential for a passive cooling system is the heat pipe, including the loop heat pipe (LHP). This research aims to study the phenomenon of heat transfer and flow characterization in the wickless loop heat pipe. The method used in this research is a simulation using the software Computational Fluid Dynamics, Fluent. This simulation study gives the effect of filling ratio and heat load in the evaporator at LHP. Demineralized water as the working fluid filled in the LHP was varied at the filling ratio values of 40%, 60%, and 80%. The heat load in the hot water temperature absorbed by the evaporator was varied by 45°C, 55°C, and 65°C. Cooling air as a heat taker in the condenser is given at a fixed temperature value of 25oC. The simulation results obtained indicate that the heat transfer in the wickless LHP has a temperature distribution profile in the LHP, which is almost uniform for every variation of filling ratio and heat load. Compared to filling ratios of 40% and 60%, at 80% filling ratios, the optimal time for the formation of natural circulation flow is achieved when the LHP is given a heat load of 55°C in the evaporator. This simulation shows that the LHP without wick does not produce an excellent natural circulation flow as expected in general natural circulation in the LHP. The results of this simulation can be used as the knowledge that the LHP that will be designed for experimental purposes must be using a wick as a vapor regulator to rise to the condenser only through one adiabatic side.
The mechanical strength analysis on the pool tub of loop heat pipe prototype using CATIA software Dedy Haryanto; Giarno Giarno; G. Bambang Heru K; Ainur Rosidi; Nursinta Adi Wahanani; Mukhsinun Hadi Kusuma
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2303

Abstract

The NuScale Small Modular Reactor operates using a fully passive cooling system. Under normal operating conditions, the cooling water used to immerse the reactor has a temperature range of 30°C – 40°C. To reduce additional water due to evaporation, the use of a loop heat pipe (LHP) as a heat sink in the pool cooling water can reduce evaporation and increase the economic value of NuScale operations. To get a further basic understanding of LHP as an additional passive cooling system, a small-scale LHP prototype was made at the Center for Nuclear Reactor Technology and Safety, National Nuclear Energy Agency. This LHP prototype consists of several components, including a pool tub unit that simulates a pool of cooling water immersing the reactor. This research focuses on analyzing the mechanical strength of the pool tub before it is made and used as an experimental tool. The purpose of the analysis is to determine the mechanical strength of the pool tub including mechanical stress and translational displacement related to the level of safety and design safety. The method used is to simulate using CATIA software to analyze the mechanical strength of a swimming pool by making a 3-dimensional model according to an existing design, providing restraint on a 3-dimensional model, providing loads in the form of pressure and temperature on a 3-dimensional model, and testing mechanical strength. The simulation results show that the mechanical stress produced is 1.96 x 108 N/m2 at the bottom of the pool tub. The mechanical stress that occurs is smaller than the yield strength of the AISI 1040 Carbon Steel material, which is 3.5 x 108 N/m2. The translational displacement obtained of 0.844 mm is very small when compared to the dimensions of the pool basin, so it does not result in changes in the shape of the pool basin when pressure and temperature are given during the experiment. The conclusion of this simulation shows that the design of the pool tub unit is safe to manufacture and operate during the experiment.
Analysis of Wind Energy Potential as A Hybrid Power Plant in Banda Aceh and Surrounding Areas Ratna Sary; Ahmad Syuhada; Teuku Zulfadli
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2298

Abstract

Wind is one of the energy sources developed as new and renewable energy in Aceh Province because of the sufficient wind potential available. In its utilization, wind speed is one of the important and main variables in calculating the amount of energy obtained. This energy will later be combined with energy sources from PLN which have been using fossil fuels. Wind potential in Banda Aceh and its surroundings is very possible to be converted into electrical energy because the average wind speed in Banda Aceh and its surroundings ranges from 4-6 m/s and can blow for approximately 4 to 6 hours per day. The results of the study of the potential of wind energy as a power plant in the Saree area (Aceh Besar District), then obtained an average wind speed in 2017 of 4.2 m/s by generating electrical power of 312 Watt/m2. In 2018 it was 4.6 m/s with an electric power of 341 Watt/m2. While in 2019 it was 5 m/s by generating an electric power of 368 Watt/m2 and the comparison in two other areas, namely Gampong Jawa and Gampong Deah Glumpang Banda Aceh, was obtained by Gampong Jawa with a wind speed of 4.35 m/s by producing 324 Watts/m2 and in Deah Glumpang Village with a wind speed of 3.95 m/s with a power output of 296 Watt/m2
Study on process parameters effects to burr height in drilling of Aluminium 6061 alloy sheet on CNC milling machine Nguyen Huu Tho; Nguyen V. A. Duy; Dinh Tien Dung; Nguyen M. Huy; Nguyen V. Thanh; Jannifar Jannifar
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2116

Abstract

Productivity and quality of drilling are also of interest, have been paid more attention on the size of burr through the cleaning process. The presence of burr on drilled workpieces creates problems not only in the processing but also in the assembly line, affecting the accuracy of the assembly. Many factors have significant impacts on the burr height such as spindle speed, cutting feed and drill bit diameter. In this paper, the experiment investigation of those process parameters to burr height is implemented, then Taguchi-based approach is used to determine the influence density of each factors. Moreover, artificial neural network model is applied to predict the burr height based on the three input factors. The experiment results showed that the two most important factors affecting the burr are the speed of the spindle and the feed rate. The factors realized to be significant for burr formulation such as an 8 mm drill bit diameter, a CNC spindle speed of 2500 rpm, and feed rate of 70 mm/rev, which will result in the smallest output in terms of the height of the obtained burr is 0.12792 mm.

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