Article Per Year (5 Year)
p-Index From 2021 - 2026
0.562
P-Index
This Author published in this journals
All Journal Scientific Journal of Mechanical Engineering Kinematika Jurnal Sains Student Research Jurnal Mesin Sains Terapan
Nurmala Dyah Fajarningrum
Universitas Tidar
Automotive Engineering Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
PENGARUH VARIASI DEBIT UDARA TERHADAP KARAKTERISTIK ALIRAN DUA FASE PADA AIRLIFT PUMP DENGAN SUDUT INJECTOR 15° Auzan Faizdaffa Hakim; Trisma Jaya Saputra; Nurmala Dyah Fajarningrum
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.818

Abstract

Airlift pump is a type of pumping system that utilizes the density difference between air and water to create two-phase flow, commonly applied in closed-loop circulation systems. This study aims to investigate the effect of varying air flow rates on the characteristics of two-phase flow in an airlift pump with a 15° swirl injector. The experimental method was used with air flow variations of 30, 40, 50, and 60 liters per minute (lpm), focusing on parameters such as superficial velocity of liquid and gas, liquid hold-up, gas volumetric quality, and observed flow patterns. The results show that increasing the air flow rate significantly raises the superficial velocities of both liquid and gas. Furthermore, liquid hold-up tends to decrease with higher air flow rates, while gas volumetric quality increases. The observed flow patterns include bubble, slug, and churn flows, each formed depending on the level of injected air flow. Overall, increasing the air flow rate has a significant impact on the hydrodynamic characteristics of the airlift pump system.
Pemodelan Matematis Konsumsi Daya Belt Conveyor menggunakan Matlab untuk Analisis dan Optimasi Energi Ibnu Rosyid Ridwana; Trisma Jaya Saputra; Raka Mahendra Sulistiyo; Nurmala Dyah Fajarningrum; Arif Rahman Saleh
JOURNAL SAINS STUDENT RESEARCH Vol. 4 No. 5 (2026): Oktober: Jurnal Sains Student Research
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jssr.v4i5.12745

Abstract

Belt conveyor systems are material transport systems that require significant energy; therefore, mathematical models are needed to represent power requirements and energy consumption. This study aims to develop a mathematical model for belt conveyor power consumption based on the ISO 5048 standard and to evaluate its fit against actual data. The research involved modeling and simulation using MATLAB, testing inclination angles of 0°, 3°, 5°, 7°, 10°, 12°, and 15°, while maintaining a constant belt speed of 5 m/s and a conveying capacity of 900 tons/hour. Model parameters were estimated using the Least Square (LS) and Recursive Least Square (RLS) methods and compared with the Buckingham Pi approach. Evaluation was conducted using Goodness of Fit, Residual Error, Predicted vs. Actual analysis, Root Mean Square Error (RMSE), and the Coefficient of Determination (R²). The results indicate that the model effectively represents the actual data. The RLS method yielded the best performance, with an RMSE of 0.8442 and an R² of 0.9561, compared to 0.9603 and 0.9432 for LS, and 0.9751 and 0.9415 for the Buckingham Pi approach. Energy consumption increased from 24.8743 kWh at 0° to 103.47 kWh at 15°. The findings demonstrate that the developed mathematical model aligns with the fundamental concepts of ISO 5048 and is suitable for analyzing the power requirements and energy consumption of belt conveyors under the tested conditions.
Perancangan konseptual dan analisis termal water tube boiler berbasis pemanfaatan panas insinerator Umam Nashrullah; Nurmala Dyah Fajarningrum; Sigit Mujiarto
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10473

Abstract

National waste generation continues to increase each year, and a large proportion remains inadequately managed. One applicable treatment alternative is thermal processing using an incinerator, which produces heat energy that can potentially be utilized as an energy source for a boiler to generate steam. This study aims to obtain a conceptual design of a water tube boiler integrated with an incinerator with a capacity of 100 kg/h and to evaluate its structural strength through Finite Element Analysis (FEA)-based simulation. The methods used include energy balance calculation, heat transfer analysis, determination of the main dimensions, geometric modeling, and static structural simulation using SolidWorks software, with AISI 304 material and an operating pressure of 4 bar. The calculation results show that the available combustion heat energy is 680,000 kJ/h, with the boiler capacity set at 40 kg/h. The required heat transfer area is met using five heating tubes with a natural circulation system, and the maximum allowable working pressure (MAWP) is 1.156 MPa. The simulation results show a maximum von Mises Stress of 71.248 MPa at the junction between the drum and the water pipe, a maximum displacement of 0.217 mm, and a minimum Factor of Safety of 2.903, indicating that the structure is able to withstand the operating pressure. Based on the design and simulation results, the designed water tube boiler meets the specified capacity requirement and has adequate structural strength.
Co-Authors Arif Rahman Saleh Auzan Faizdaffa Hakim Ibnu Rosyid Ridwana Raka Mahendra Sulistiyo Sigit Mujiarto Trisma Jaya Saputra Umam Nashrullah