Pengaruh Kecepatan Putar Impeller dan Laju Penambahan Reagen H3PO4 Terhadap Homogenitas Produk Hidroksiapatit Cangkang Keong Sawah Pada Reaktor Berpenganduk

Wati, Ni'mah and Prayadi, Icha Nur (2026) Pengaruh Kecepatan Putar Impeller dan Laju Penambahan Reagen H3PO4 Terhadap Homogenitas Produk Hidroksiapatit Cangkang Keong Sawah Pada Reaktor Berpenganduk. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Hidroksiapatit (HAp) merupakan biokeramik penting dalam aplikasi biomedis karena sifat bioaktivitas, biokompatibilitas, dan osteokonduktivitasnya. Kualitas HAp sangat dipengaruhi oleh homogenitas produk yang ditentukan oleh distribusi ukuran partikel serta rasio Ca/P. Penelitian ini bertujuan untuk menganalisis pengaruh kecepatan putar impeller dan laju penambahan reagen H₃PO₄ terhadap pola aliran fluida, waktu pencampuran (Mixing Time), serta perpindahan massa pada sintesis hidroksiapatit dalam reaktor berpengaduk melalui pendekatan eksperimental dan Computational Fluid Dynamics (CFD). Hasil penelitian menunjukkan bahwa variasi kecepatan putar impeller dan laju alir berpengaruh signifikan terhadap pola aliran, mixing time, dan homogenitas sistem. Kondisi terbaik diperoleh pada kecepatan 350 rpm dan laju alir 170 mL/min yang menghasilkan pola aliran double loop circulation (aksial-radial) dengan vortex stabil, dead zone minimal, serta distribusi fluida yang lebih merata, sesuai dengan hasil simulasi CFD. Pada kondisi ini, Mixing time tercepat tercapai pada detik ke-40 dengan analisa densitas dan detik ke-20 pada analisa kontur distribusi. Selain itu, peningkatan laju penambahan reagen H₃PO₄ pada kecepatan 350 rpm meningkatkan koefisien perpindahan massa hingga 1,82 × 10-⁵ m/s. Korelasi antara bilangan Sherwood (Sh) dan Reynolds (Re) mengikuti persamaan Sh = 7,9 x 10-1 Re0,2341 pada Re 8714,57, yang menunjukkan bahwa peningkatan turbulensi dan intensitas sirkulasi mempercepat homogenisasi sistem. Secara keseluruhan, kondisi hidrodinamika yang lebih kuat terbukti meningkatkan efektivitas pencampuran dan kualitas hidroksiapatit yang dihasilkan.
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Hydroxyapatite (HAp) is an important bioceramic in biomedical applications due to its bioactivity, biocompatibility, and osteoconductivity. The quality of HAp is greatly influenced by the homogeneity of the product, which is determined by the particle size distribution and the Ca/P ratio. This study aims to analyze the effects of impeller rotational speed and the rate of H₃PO₄ reagent addition on fluid flow patterns, Mixing time, and mass transfer during hydroxyapatite synthesis in a stirred reactor using experimental and Computational Fluid Dynamics (CFD) approaches. The results show that variations in impeller rotational speed and flow rate significantly affect the flow pattern, Mixing Time, and system homogeneity. Optimal conditions were achieved at 350 rpm and a flow rate of 170 mL/min, resulting in a double-loop circulation (axial-radial) flow pattern with a stable vortex, minimal dead zones, and a more uniform fluid distribution, consistent with the CFD simulation results. Under these conditions, the fastest Mixing time was achieved at the 40th second for the density analysis and at the 20th second for the distribution contour analysis. Furthermore, increasing the rate of H₃PO₄ reagent addition at a speed of 350 rpm increased the mass transfer coefficient to 1.82 × 10⁻⁵ m/s. The correlation between the Sherwood number (Sh) and the Reynolds number (Re) follows the equation Sh = 7,9 x 10-1 Re0,2341 at Re = 8714.57, indicating that increased turbulence and circulation intensity accelerate the homogenization of the system. Overall, stronger hydrodynamic conditions were shown to improve mixing efficiency and the quality of the resulting hydroxyapatite.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Hidroksiapatit, presipitasi basah, kecepatan putar, laju penambahan reagen, homogenitas, Computational Fluid Dynamics (CFD) Hydroxyapatite, wet precipitation, rotational speed, reagent addition rate, homogeneity, Computational Fluid Dynamics (CFD)
Subjects:	T Technology > TP Chemical technology > TP155.7 Chemical processes. T Technology > TP Chemical technology > TP248.25.B55 Bioreactors--Fluid dynamics.
Divisions:	Faculty of Vocational > 24305-Industrial Chemical Engineering
Depositing User:	Ni'mah Wati
Date Deposited:	29 Jul 2026 03:46
Last Modified:	29 Jul 2026 03:46
URI:	http://repository.its.ac.id/id/eprint/138966

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