Visualisasi makro instabilitas pola alir serta pengukuran pumping capacity dan mixing time dalam tangki berpengaduk dengan side entering impeller

Wahyujati, Azis Hardianto and Fandinuari, Hermawan (2015) Visualisasi makro instabilitas pola alir serta pengukuran pumping capacity dan mixing time dalam tangki berpengaduk dengan side entering impeller. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mengetahui karakteristik pola alir dan makro instabilitas dengan menggunakan video camera, serta waktu pencampuran (mixing time) yang terjadi dalam reactor berpengaduk menggunakan side entering impeller secara eksperimen . Berdasarkan penelitian yang berkembang, penggunaan side-entering impeller belum banyak diteliti sehingga fenomena yang terjadi pada sistem pencampuran tersebut seperti pola alir dan makro instabilitas belum banyak diketahui. Dengan menggunakan video camera dapat terlihat vektor, kontur, dan pola aliran yang terbentuk dari distribusi partikel padat dalam campuran. Performa pengadukan dapat diindikasikan dari waktu pencampuran (Mixing Time). Mixing time mengindikasikan seberapa lama waktu yang dibutuhkan oleh pengadukan untuk mencapai larutan yang homogen. Dengan pengukuran pH (derajat keasaman melalui penambahan zat asam dapat diketahui waktu sampai pH mencapai nilai konstan. Perubahan waktu dari pH awal sampai pH konstan ini adalah mixing time. Peralatan yang digunakan terdiri dari tangki silinder, 6 pitch blade turbine, 4 pitch blade turbine, poros impeller dan motor. Karena dalam penelitian ini digunakan teknik visualisasi untuk mempelajari pola aliran dalam tangki berpengaduk dengan side entering impeller, maka tangki silinder dikelilingi oleh tangki kotak. Dari hasil penelitian yang telah dilakukan, didapatkan bahwa semakin tinggi tinggi liquida maka variasi pola alir akan semakin sedikit. Semakin banyak jumlah daun impeller maka variasi aliran akan semakin berkurang, namun life time pola alir yang terjadi lebih lama. Semakin besar kecepatan pengadukan, diameter impeller, dan semakin banyak jumlah blade maka mixing time akan semakin berkurang. Semakin banyak jumlah blade, maka pumping capacity semakin besar. ==================================================================================================== The purpose of this research to determine the characteristic of flow patterns, macro instability by visualization based on video camera, and mixing time in agigated tank with side-entering impeller. During this studies, side-entering agitated tank very rarely use more often based on simulations and experiment that require a lot of cost. The phenomena such as flow pattern and macro instability is not yet known. By using a video camera, the analysis of systems involving fluid flow, heat transfer, and other related phenomena sucha as chemical reactions can be very aesthetically vector and contour of the flow pattern which is formed from the distribution of solid particle in the mixture. Mixing performance can be determined by measuring mixing time. Mixing time is the time which is required by blending process to achieve level homogenity of some mixture.This can be measured by adding acid solution, and measuring the time that is required to achieve constant pH meter reading. The equipment used consisted of a cylindrical tank, 6 pitch blade turbine, 4 pitch blade turbine, impeller shaft, and the motor. Because this study used visualization techniques to study flow patterns in stirred tank with a side entering impeller, then the cylindrical tank surrounded by boxes. From the research that has been done, it can be found that the greater weight of liquid inside the vessel, the variation of flow pattern become decrease. As the impeller diameter become greater the variation of flow pattern also greater. The number of blade is inversely proportional to the variation of flow patterm. But the greater number of blade, the life time of each flow pattern become greater. Mixing time is inversely proportional to rotational speed, impeller diameter, and the number of blades.

Item Type: Thesis (Undergraduate)
Additional Information: RSK 620.106 4 Wah v
Uncontrolled Keywords: Side-entering, Tangki Berpengaduk, Impeler,Waktu Pencampuran
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics.
Divisions: Faculty of Industrial Technology > Chemical Engineering > 24201-(S1) Undergraduate Thesis
Depositing User: - Taufiq Rahmanu
Date Deposited: 05 Apr 2019 04:06
Last Modified: 05 Apr 2019 04:06
URI: http://repository.its.ac.id/id/eprint/62702

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