Jannah, Rofifah Hilyatul (2019) Analisis Pengaruh Geometri Twisted Tape Insert Dan Konsentrasi Nanofluida Al2O3/Air Pada Tube Heat Exchanger Menggunakan Metode Computational Fluid Dynamics. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penukar panas adalah alat yang umum digunakan sebagai media perpindahan panas antara dua fluida yang banyak digunakan di industri. Selama ini telah banyak upaya yang dilakukan untuk meningkatkan perpindahan panas pada heat exchanger guna meningkatkan performanasinya serta mengurangi ukurannya. Pengurangan ukuran merupakan hal yang penting karena dapat mengurangi biaya pembuatan serta mengurangi ruang. Salah satu upaya untuk meningkatkan laju perpindahan panas adalah dengan metode pasif yakni dengan menambahkan promotor turbulensi seperti twisted tape insert. Adanya twisted tape insert pada tube dapat meningkatkan percampuran fluida pada tube heat exchanger sehingga mengurangi ketebalan boundary layer yang menghasilkan perpindahan panas yang lebih tinggi. Selain itu untuk meningkatkan perpindahan panas juga dapat dicapai dengan meningkatkan sifat-sifat termal fluida kerja dengan cara mensuspensikan partikel padat berukuran nanometer ke dalam fluida kerja dasarnya. Pada penelitian ini dilakukan simulasi untuk mengetahui pengaruh geometri twisted tape dan konsentrasi nanofluida Al2O3/air sebagai fluida kerja terhadap perpindahan panas. Terdapat tiga variasi geometri yakni single tape, co-dual twisted tape, dan counter-dual twisted tape. Sedangkan variasi konsentrasi nanofluida Al2O3/air yakni 0.5%, 1%, dan 1.5%. Dari hasil simulasi diketahui bahwa geometri counter-dual twisted tape dengan fluida kerja nanofluida Al2O3/air pada konsentrasi 1,5% merupakan geometri dan konsentrasi yang paling optimal dalam menaikkan perpindahan panas dengan kenaikan bilangan nusselt sebesar 50,73% dibandingkan dengan tube tanpa twisted tape, serta kenaikan faktor gesekan yang hanya sebesar 1.22 kali dibandingkan dengan tube dengan susunan single twisted tape.
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Heat exchangers are devices commonly used as heat transfer media between two fluids that are widely used in the industry. So far, many efforts have been made to increase heat transfer in the heat exchanger to improve its performance and reduce its size. Size reduction is important because it can reduce manufacturing costs and reduce space. One of the methods to increase the heat transfer rate is the passive method by adding a turbulence promoter such as a twisted tape insert. The presence of twisted tape inserts on the tube can increase fluid mixing in the tube of a heat exchanger, thereby reducing the thickness of the boundary layer which results in higher heat transfer. In addition, to enhance heat transfer can also be achieved by increasing the thermal properties of the working fluid by suspending nanometer-sized solid particles into the basic working fluid. In this study, a simulation was conducted to determine the effect of twisted tape geometry and the concentration of Al2O3 /water nanofluid as working fluid against heat transfer. There are three variations of geometry, namely single twisted tape, co-dual twisted tape, and counter-dual twisted tape. While variations in concentration of nanofluids are 0.5%, 1%, and 1.5%. From the simulation results, it is known that the geometry of counter-dual twisted tape with working fluid nanofluid Al2O3 /water at concentration of 1.5% is the most optimal geometry and concentration in increasing heat transfer with an increase of nusselt number by 50.73% compared to a tube without twisted tape , and an increase in friction factor which is only 1.22 times compared to a tube with a single twisted tape arrangement.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | twisted tape insert, nanofluida, bilangan nusselt, faktor gesekan. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | Rofifah Hilyatul Jannah |
| Date Deposited: | 13 Nov 2024 05:24 |
| Last Modified: | 13 Nov 2024 05:24 |
| URI: | http://repository.its.ac.id/id/eprint/68960 |
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