Studi Simulasi Dan Eksperimental Pengaruh Variasi Bentuk Dan Diameter Sel Honeycomb Terhadap Karakteristik Aliran Udara Dan Akustik Pada Flow Straightener

Mahendra, Angga (2026) Studi Simulasi Dan Eksperimental Pengaruh Variasi Bentuk Dan Diameter Sel Honeycomb Terhadap Karakteristik Aliran Udara Dan Akustik Pada Flow Straightener. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Honeycomb banyak digunakan sebagai perangkat penyearah aliran yang bersifat pasif dan berguna untuk memperbaiki keseragaman aliran udara pada saluran tertutup, namun perbandingan antar bentuk sel (lingkaran, heksagon, persegi) pada rentang diameter yang setara masih belum banyak dikaji. Penelitian ini bertujuan untuk menganalisis pengaruh variasi bentuk dan diameter sel honeycomb terhadap karakteristik aliran yaitu beda tekanan (\Delta P) dan reduksi energi kinetik turbulensi (R_{TKE}), serta karakteristik akustik yaitu Transmission Loss (TL), Insertion Loss (IL), dan Noise Reduction (NR), yang berguna untuk menentukan geometri honeycomb dengan kinerja terbaik untuk aplikasi HVAC. Untuk mencapai tujuan tersebut, dilakukan simulasi Computational Fluid Dynamics (CFD) menggunakan modul ANSYS CFX dengan model turbulensi SST k-ω pada sembilan variasi geometri (tiga bentuk sel dan tiga diameter hidraulik: 17,32; 20,78; dan 24,25 mm) di dalam pipa ducting 6 inci. Metodologi CFD divalidasi melalui perbandingan deviasi relatif kecepatan antara hasil simulasi dan pengukuran eksperimental menggunakan Hot Wire Anemometer pada dua prototipe honeycomb berbasis pipa PVC. Selain itu, karakterisasi akustik IL dan NR dilakukan dengan pengukuran eksperimen, serta simulasi TL menggunakan modul Harmonic acoustics, termasuk pada konfigurasi honeycomb dengan sudut miring (0°, 5°, 10°). Hasil penelitian menunjukkan bahwa geometri heksagon dengan diameter hidraulik 24,25 mm memberikan keseimbangan terbaik antara \Delta P rendah dan R_{TKE} tinggi. Deviasi validasi kecepatan berkisar 2,34–47,38% dan menurun seiring naiknya kecepatan uji. Kemiringan sel meningkatkan TL secara signifikan pada frekuensi 115–700 Hz, namun disertai peningkatan \Delta P hingga hampir lima kali lipat dan R_{TKE} negatif pada θ=10°. Dapat disimpulkan bahwa bentuk dan diameter sel honeycomb, serta sudut kemiringannya, berperan penting dalam menentukan trade-off antara kualitas aliran, penalti energi, dan performa akustik, sehingga pemilihan geometri perlu disesuaikan dengan prioritas aplikasi HVAC yang dituju.
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Honeycombs are widely used as flow-straightening devices that are inherently passive, useful for improving airflow uniformity in enclosed ducts; however, comparisons between cell shapes (circular, hexagonal, square) across an equivalent range of diameters have not been extensively studied. This study aims to analyze the effect of honeycomb cell shape and diameter variations on flow characteristics, namely pressure difference (\Delta P}) and turbulent kinetic energy reduction (R_{TKE}), as well as acoustic characteristics, namely Transmission Loss (TL), Insertion Loss (IL), and Noise Reduction (NR), which are useful for determining the honeycomb geometry with the best performance for HVAC applications. To achieve this objective, Computational Fluid Dynamics (CFD) simulations were performed using the ANSYS CFX module with the SST k-ω turbulence model on nine geometric variations (three cell shapes and three hydraulic diameters: 17.32, 20.78, and 24.25 mm) within a 6-inch ducting pipe. The CFD methodology was validated by comparing the relative velocity deviation between simulation results and experimental measurements using a Hot Wire Anemometer on two PVC-pipe-based honeycomb prototypes. In addition, IL and NR acoustic characterization was carried out through experimental measurements, while TL simulation was performed using the Harmonic Acoustics module, including for honeycomb configurations with tilt angles (0°, 5°, 10°). The results show that the hexagonal geometry with a hydraulic diameter of 24.25 mm provides the best balance between low \Delta P and high R_{TKE}. Velocity validation deviation ranged from 2.34–47.38% and decreased with increasing test velocity. Cell tilting significantly increased TL at frequencies of 115–700 Hz, but was accompanied by an increase in \Delta P of nearly fivefold and a negative R_{TKE} at θ = 10°. It can be concluded that honeycomb cell shape, diameter, and tilt angle play an important role in determining the trade-off between flow quality, energy penalty, and acoustic performance, so that geometry selection needs to be tailored to the priorities of the intended HVAC application.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Honeycomb, Flow Straightener, Computational Fluid Dynamics, Pressure Drop, Turbulent Kinetic Energy, Transmission Loss Honeycomb, Flow Straightener, Computational Fluid Dynamics, Pressure Drop, Turbulent Kinetic Energy, Transmission Loss.
Subjects:	Q Science > QC Physics > QC151 Fluid dynamics Q Science > QC Physics > QC221 Acoustics. Sound
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Angga Mahendra
Date Deposited:	06 Aug 2026 04:22
Last Modified:	06 Aug 2026 04:22
URI:	http://repository.its.ac.id/id/eprint/144145

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