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All Journal Jurnal POLIMESIN
Akhyar Akhyar
Syiah Kuala University, Scopus Author ID: 57191728819
Automotive Engineering Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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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 | Full PDF (651.019 KB) | 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.
Numerical-hydrodynamic analysis, vickers hardness, and tensile test of cast-brass alloy for boat propellers Akhyar Akhyar; Iqbal Iqbal; Muhammad Bahi; Ahmad Farhan; Seab Piseth
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3743

Abstract

Computational Fluid Dynamics (CFD) has been applied to simulate boat propellers. The material for boat propellers generally uses a brass alloy metal which is produced by a casting process. The purpose of this study was to simulate CFC propellers, evaluate the hardness and tensile strength of samples cast from the brass alloy used to produce ship propellers. The methods show that turbulent kinetic energy, density streamline characteristic, and velocity distribution are simulated boat propellers with CFD applications. Furthermore, the propeller is cast to observe the surface hardness and tensile strength of the cast alloy. The results revealed that the boundary conditions - which served as the simulation's input parameters, the geometry of the rotating and stationary domains, the geometry and type and number of gratings, the geometric accuracy of the propeller model, mass flow rate, rotational angular velocity, and stationary angular velocity - all had a significant impact on the parameters. Brass alloy and cast alloy raw material hardness values were measured on the surface of the propeller casting product. While 128 HV was attained after casting, the average hardness value for solid cylinders manufactured of the raw metal alloy was 171.67 HV. The three test sessions' stress vs. strain graphs were produced using the Cu-Zn alloy metal's tensile test results. The cast Cu-Zn alloy has a maximum tensile strength of 352 MPa and a maximum yield stress of 330 MPa.
Co-Authors Ahmad Farhan Ahmad Farhan Darwin Harun Iqbal Iqbal Muhammad Bahi Muhammad Ilham Maulana Muhammad Robby Seab Piseth