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All Journal Rotasi R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Kreativitas PKM PEDULI: Jurnal Imiah Pengabdian Pada Masyarakat Indonesian Journal of Community Dedication Piston: Journal of Technical Engineering Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Journal of Applied Science, Engineering, Technology, and Education International Journal of Marine Engineering Innovation and Research Jurnal Bakti Masyarakat Indonesia Academia Open Journal La Multiapp Indonesian Journal of Innovation Studies Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Eduvest - Journal of Universal Studies Madani : Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Unimus Nemui Nyimah
Damora Rhakasywi
Departement Of Mechanical Engineering, Universitas Pembangunan Nasional “Veteran” Jakarta
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Journal : Journal La Multiapp

 1 
Numerical Study of Cavitation Phenomenon in a Venturi Tube Rachman, Muhammad Nanda Fatur; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 5 No. 4 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i4.1432

Abstract

This research aims to understand and numerically analyze the cavitation phenomenon that occurs in Venturi tubes with variations in throat length and pressure changes. This research uses Ansys Fluent 2023 R2 numerical simulation with venturi tube geometries of 25 mm, 30 mm, and 35 mm and pressures of 300,000, 600,000, and 900,000 Pa. A multiphase flow model with water liquid and water vapor is applied to predict cavitation using a mixture model. RANS steady state conditions with the k-ε turbulence model are used to solve the continuity, momentum, energy and volume fraction equations. The Schnerr-Sauer cavitation model calculates the phase transition between water-liquid and water vapor. Geometry varies by reference journal with different converging and diverging angles, outlined in tables and figures. 2D simulations are carried out using a pressure based solver with specified boundary conditions, using the Presto! for pressure solutions, and upwind and Quick schemes for discretization. The results of this research show that 1) Length throat 25 mm has the most stable distribution compared to 30 and 35 mm geometries at a pressure of 600,000 Pa. 2) The cavitation phenomenon is influenced by changes in geometry where at 35 mm geometry greater cavitation occurs in the area near the wall inlet convergent. 3) At a pressure of 900,000 Pa, the cavitation area that forms becomes larger and becomes a critical point in this journal.
Analysis of Calorific Value of Biopellet Diameter Variations through Proximate Test Asrianti, Nadia Putri; Fahrudin, Fahrudin; Rhakasywi, Damora; Martana, Budhi
Journal La Multiapp Vol. 5 No. 4 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i4.1516

Abstract

This study aims to evaluate the quality of biopellets as biomass energy fuel, focusing on physical and chemical characteristics based on the SNI 8021:2014 standard. The research method used is experimental with a non-factorial Completely Randomized Design (CRD). The raw materials used are a mixture of rambutan wood waste (Nephelium lappaceum L) and bintaro (Cerbera manghas) with tapioca flour as an organic binder. Testing includes proximate analysis (moisture, ash, volatile matter, and fixed carbon) and calorific value using an oxygen bomb calorimeter. The results show that the produced biopellets meet several parameters of the SNI 8021:2014 standard, such as moisture content, volatile matter, and fixed carbon. However, there is significant variation in ash test results among different diameters of biopellets tested. ANOVA test results indicate that mold diameter has a notation that has a significantly affect several biopellet characteristics, such as density and calorific value. This study also observed the potential for increased combustion efficiency of the produced biopellets. The results indicate that the raw material mixture used can reduce pollutant emissions during combustion. The conclusion of this study is that the use of a mixture of rambutan wood waste and bintaro with tapioca flour as an organic binder can produce biopellets with quality that meets standards for biomass energy applications.
Study of Gurney Flap as Passive Flow Control Method on NACA 4418 Abhitah, Athallah Nabiel; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 5 No. 6 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i6.1735

Abstract

Global problems related to the greenhouse effect and global warming have pushed research towards clean energy sources. One of the technologies of concern is wind turbines, whose performance is highly dependent on the aerodynamics of the airfoils used. This study aims to analyze the effect of input speed variation on the aerodynamic performance of NACA 4418 airfoil using gurney flap as a passive flow method. In this study, the Reynolds Averaged Navier-Stokes (RANS) method was used to calculate aerodynamic parameters, by varying the height of the gurney flap on the trailing edge of the airfoil. The results showed that the use of gurney flaps with flap height variations of 1%, 2%, and 3% of chord length was able to significantly increase the lift coefficient, with the highest increase at the flap height of 3% c. In addition, this passive method has proven to be efficient in improving aerodynamic performance without the addition of an active control system. In conclusion, variations in input speed and flap height can improve the aerodynamic performance of NACA 4418 airfoils, making this method feasible to apply to wind turbines.
Analysis of the Effect of Position and Dimension of Infrared Burner on Heat Distribution and Efficiency of Butterfly Pea Flower Drying Oven Febriana, Miftakhul Jannah; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal La Multiapp Vol. 6 No. 1 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i1.1869

Abstract

Drying is a process of reducing the moisture content of materials using thermal energy. A drying oven equipped with infrared burner technology offers improved efficiency for drying butterfly pea flowers (Clitoria ternatea); however, uneven heat distribution remains a challenge. This unevenness can result in non-uniform drying, prolonged drying times, and reduced final product quality. This study employs Computational Fluid Dynamics (CFD) simulations to model the heat transfer process within the drying oven. Six different configurations of burner positions and dimensions were examined to evaluate their effects on heat distribution and drying rates. The results indicate that more uniform heat distribution is achieved with non-aligned burner positions, while larger burner sizes generally produce better heat distribution and faster drying rates. This research highlights the importance of optimizing burner position and dimensions to maximize drying efficiency and ensure consistent product quality.
Co-Authors Abhitah, Athallah Nabiel Achmad Zuchriadi Amir Marasabessy Armansyah Armansyah Ashfi Rayhan, Fajri Asrianti, Nadia Putri Bambang Sudjasta Bambang Sudjasta Bambang Sudjasta Budhi Martana Christoforus Deberland David, Jerico Dewanto, Ramadhan Haryo Dewi, Talitha Cahya Kemala Didit Widiyanto Diraharja, Rifat Satrio Dora Samaria fahrudin Fahrudin Fahrudin Fahrudin, Fahrudin Fajri Ashfi Rayhan Febriana, Miftakhul Jannah Francisco, Jeremi Harinaldi . Imron, Raja Shadam Ali Irga Irga Kusumo, Rayhan Suryo Lina Ayu Marcelina Muhammad Naufal Bari Nur Cholis Nurzati, Syarif Adhika Adhin Pamungkas, Eny Dewi Parluhutan, Yohanes Mangatur Pradana , Sigit Prasetyo, Eko Andi Rachman, Muhammad Nanda Fatur Rita Ismail Rizkiati Ramadhani, Mahirah Salwa Aurelia Ananda Rosidi, Erlia Nurbayti Shafa, Naura Sitorus, Henri BH Sudjasta, Bambang Sulistyawati, Wiwin Suryo, Taufik Hadi Sutarya, Muhamad Farad Teris Ekamila Wiwin Sulistyawati Yuliana Dewi