Perancangan Mesin Spouted Bed Untuk Biji Sorgum Dan Penentuan Spesifikasi Centrifugal Blower melalui Pendekatan Simulasi CFD-DEM

Widiosaputra, Nabil Birre (2026) Perancangan Mesin Spouted Bed Untuk Biji Sorgum Dan Penentuan Spesifikasi Centrifugal Blower melalui Pendekatan Simulasi CFD-DEM. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sorgum merupakan komoditas pangan yang berpotensi untuk dikembangkan, namun proses pengeringan pascapanen di Desa Kedung Ottok masih dilakukan secara konvensional sehingga kurang efisien. Prototipe pengering berkapasitas 10 kg yang telah dikembangkan sebelumnya belum mampu beroperasi secara optimal karena *centrifugal blower* yang digunakan tidak dapat memfluidisasi tumpukan biji. Penelitian ini bertujuan merancang ulang mesin *spouted bed* berkapasitas 50 kg serta menentukan spesifikasi *blower* yang sesuai melalui perhitungan teoritis dan simulasi CFD-DEM menggunakan ANSYS Fluent–Rocky. Hasil perhitungan teoritis menunjukkan bahwa kecepatan minimum *spouting* sebesar 1,187 m/s masih lebih rendah dibandingkan kecepatan aliran udara di dalam pipa sebesar 41,38 m/s, dengan *pressure drop* akibat gesekan pada pipa dan *elbow* sebesar 756,2 Pa. Namun, hasil simulasi CFD-DEM yang juga mempertimbangkan hambatan dari *orifice plate* dan tumpukan biji menunjukkan bahwa *pressure drop* aktual jauh lebih tinggi, yaitu berkisar antara 6.000–7.700 Pa pada kondisi kuasi-stabil dan mencapai puncak sebesar 17.475,17 Pa. *Blower* acuan dengan kapasitas 1.170 m³/h dan tekanan statis 2.140 Pa memiliki debit udara yang mencukupi, tetapi tekanan statisnya belum memadai untuk mempertahankan proses *spouting* secara berkelanjutan. Oleh karena itu, sistem memerlukan *blower* dengan tekanan statis yang lebih tinggi.
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Sorghum is a promising food commodity; however, post-harvest drying in Kedung Ottok Village is still performed using conventional and inefficient methods. A previously developed 10 kg dryer prototype did not operate satisfactorily because the centrifugal blower was unable to fluidize the grain bed. This study redesigns a 50 kg *spouted-bed* dryer and determines the appropriate blower specifications through theoretical calculations and CFD-DEM simulations using ANSYS Fluent–Rocky. The theoretical analysis indicates a minimum *spouting* velocity of 1.187 m/s, which is lower than the air velocity inside the pipe of 41.38 m/s, with a pressure drop of 756.2 Pa caused by friction in the pipe and elbow. However, the CFD-DEM simulation, which also accounts for the resistance of the *orifice plate* and the grain bed, reveals that the actual pressure drop is significantly higher, ranging from 6,000 to 7,700 Pa under quasi-stable conditions and reaching a peak value of 17,475.17 Pa. The reference blower, with a capacity of 1,170 m³/h and a static pressure of 2,140 Pa, provides sufficient airflow but does not generate enough static pressure to sustain continuous *spouting*. Therefore, a blower with a higher static pressure is required.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Centrifugal Blower, Computational Fluid Dynamics (CFD), Spouted Bed, Pressure Loss, Sorgum, Discrete Element Method (DEM)
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Nabil Birre Widiosaputra
Date Deposited:	22 Jul 2026 02:38
Last Modified:	22 Jul 2026 02:38
URI:	http://repository.its.ac.id/id/eprint/136160

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