Studi Numerik Pengaruh Sudut Secondary Inlet pada Suction Chamber terhadap Unjuk Kerja Jet Ejector Gas dengan Variasi Sudut 30°, 45°, 60°, dan 90°

Nasution, Omar Thariq Yusuf (2026) Studi Numerik Pengaruh Sudut Secondary Inlet pada Suction Chamber terhadap Unjuk Kerja Jet Ejector Gas dengan Variasi Sudut 30°, 45°, 60°, dan 90°. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan refrigeran konvensional seperti CFC, HCFC, dan HFC telah terbukti berkontribusi signifikan terhadap pemanasan global dan menipisnya lapisan ozon akibat nilai Global Warming Potential (GWP) dan nilai Ozone Depletion Potential (ODP) yang tinggi dan umur atmosfer yang panjang. Sebagai alternatif ramah lingkungan, CO₂ (R-744) dengan ODP = 0 dan GWP = 1 mulai dikembangkan untuk sistem pendinginan dan desalinasi berbasis mechanical vapor compression. Mahdi & Ezzat (2025) telah menunjukkan bahwa optimasi geometri ejector khususnya variasi sudut secondary inlet secara signifikan memengaruhi distribusi momentum dan entrainment ratio pada ejector. Temuan ini menjadi landasan bagi penelitian ini untuk mengkaji pengaruh variasi sudut secondary inlet secara numerik pada konfigurasi jet ejector gas CO₂ –N₂, sekaligus menjadi pembanding dengan studi eksperimental yang dilakukan oleh Widodo dan Suryo (2011). Penelitian ini melakukan analisis numerik menggunakan metode Computational Fluid Dynamics (CFD) pada perangkat lunak ANSYS Fluent untuk mengevaluasi pengaruh variasi secondary inlet angle terhadap unjuk kerja ejector dua species, dengan CO₂ sebagai primary fluid dan N₂ sebagai secondary fluid. Variasi sudut masuk secondary fluid (secondary fluid inlet angle) yang diuji meliputi 30°, 45°, 60°, dan 90°. Model turbulensi yang digunakan adalah k-ɛ RNG. Hasil yang diharapkan dari penelitian ini adalah diperolehnya nilai sudut masuk secondary fluid (secondary fluid inlet angle) yang optimal, yang mampu memaksimalkan efisiensi ejector, sehingga dapat memberikan rekomendasi desain yang lebih efektif untuk penerapan sistem refrigerasi berbasis CO₂ yang efisien dan ramah lingkungan.
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The use of conventional refrigerants such as CFCs, HCFCs, and HFCs has been proven to contribute significantly to global warming and ozone layer depletion due to their high Global Warming Potential (GWP), high Ozone Depletion Potential (ODP), and long atmospheric lifetime. As an environmentally friendly alternative, CO₂ (R-744), with an ODP of 0 and a GWP of 1, has gained increasing attention for application in refrigeration and desalination systems based on mechanical vapor compression. Mahdi and Ezzat (2025) demonstrated that optimization of ejector geometry, particularly the variation of the secondary inlet angle, significantly influences momentum distribution and the entrainment ratio in ejectors. Their findings provide the basis for the present study, which investigates the effect of secondary inlet angle variation through numerical simulation in a CO₂–N₂ gas ejector configuration, while also providing a comparison with the experimental study conducted by Widodo and Suryo (2011). This research employs Computational Fluid Dynamics (CFD) analysis using ANSYS Fluent to evaluate the effect of secondary inlet angle variation on the performance of a two-phase ejector, with CO₂ as the primary fluid and N₂ as the secondary fluid. The secondary inlet angles investigated are 30°, 45°, 60°, and 90°. The RNG k-ε turbulence model is employed in the simulations. The expected outcome of this study is to identify the optimum secondary inlet angle that maximizes the ejector efficiency, thereby providing recommendations for a more effective ejector design for efficient and environmentally friendly CO₂-based refrigeration systems.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Ejector, Secondary Inlet Angle, Unjuk Kerja, CFD, CO2, N2, Ejector, Secondary Inlet Angle, Performance, CFD, CO2, N2
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics T Technology > TJ Mechanical engineering and machinery > TJ950 Pneumatic machinery
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Omar Thariq Yusuf Nasution
Date Deposited:	31 Jul 2026 04:18
Last Modified:	31 Jul 2026 04:18
URI:	http://repository.its.ac.id/id/eprint/139089

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