Numerical Study of Forced Convection with Various Fin Height and Staggered Arrangement in Annular Finned Tube Heat Exchangers

Deluxe, La (2021) Numerical Study of Forced Convection with Various Fin Height and Staggered Arrangement in Annular Finned Tube Heat Exchangers. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tabung bersirip eksternal banyak digunakan untuk penukaran panas diterapkan pada berbagai bidang peralatan industri seperti pembangkit listrik, pendinginan, sistem, pendingin elektronik, teknik makanan, produksi pertanian, dan rumah. Karena geometrinya yang sederhana, produksinya meningkat dengan kemajuan teknologi manufaktur seperti roll forming dan pengelasan. Mengenai kualitas kombinasi tabung bersirip, peningkatan luas permukaan sirip peningkatan efisiensi perpindahan panas, tetapi peningkatan sirip yang lebih tinggi pitch sempit menciptakan hambatan aliran atau penurunan tekanan yang lebih tinggi. Karena itu, insinyur dan peneliti selalu mencari konfigurasi sirip yang optimal untuk jenis penukaran panas ini. Dalam penelitian ini, Penyelidikan numerik tabung bersirip annular adalah: dilakukan dengan menggunakan perangkat lunak dinamika fluida (CFD) ANSYS FLUENT dengan model 3 dimensi. Tujuan dari penelitian ini adalah untuk menganalisis pengaruh tinggi pada laju perpindahan panas dan penurunan tekanan. Untuk memprediksi kestabilan aliran dan perpindahan panas konjugasi, berdasarkan teori grup Renormalisasi (RNG) model turbulensi k- telah digunakan. Studi ini telah dilakukan di tempat tertentu kecepatan masuk (Vin = 4,7 m/s) melintasi bundel tabung empat baris secara terhuyung-huyung pengaturan. Sirip kotak pada tabung terhuyung-huyung ditempatkan di dalam saluran persegi panjang dengan berbagai ketinggian sirip dari 5mm hingga 11 mm dengan kenaikan 2 mm. Perpindahan panas dan penurunan tekanan di sisi udara menguntungkan penukar panas tabung bersirip telah ditentukan secara numerik. Belajar saat ini juga memperhatikan karakteristik aliran dan perpindahan panas lokal dan pengaruh distribusi aliran udara di dalam bundel. Berbagai perbedaan selang suhu suhu tabung diatur sesuai dengan kecepatan suhu dan penurunan tekanan. Hasil masing-masing juga disajikan untuk laju panas, efisiensi dan efektifitas sirip. Hasil numerik pada efek tinggi sirip untuk kedua susunan tabung sangat sesuai dengan data sebelumnya dalam meningkatkan tinggi sirip memberikan peningkatan penurunan tekanan dari bundel tabung bersirip. Apalagi itu menunjukkan bahwa peningkatan tinggi sirip memberikan penurunan efisiensi sirip dan peningkatan efektifitas sirip.
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Circular externally finned tubes are widely used for heat exchangers applied to various fields of industrial equipment such as power plants, refrigeration systems, electronics cooling, food engineering, agricultural production, and livestock raise. Due to their simple geometry, their production is increasing with the advances in manufacturing technologies like roll forming and welding. Concerning the physics of finned-tube combinations, an increased fin surface area contributes to the improvement of heat-transfer efficiency, but the higher fin density of narrow pitch creates higher flow resistance or pressure drop. Therefore, engineers and researchers are always searching for the optimum fin configurations for this kind of heat exchanger. In the present study, A numerical investigation of annular finned tubes was performed using the computational fluid dynamics (CFD) software ANSYS FLUENT with 3-dimensional model. The objective of the study is to analyze the effect of fin height on the heat transfer rate and pressure drop. To predict the steady flow and conjugate heat transfer, the Renormalization group theory (RNG) based k-ɛ turbulence model has been used. This study has been conducted in a certain velocity inlet (Vin = 4.7 m/s) across four-row tube bundles in staggered arrangements. A circular fin on staggered tube placed inside the rectangular duct with various fin height from 5mm to 11 mm of increment 2 mm. The heat transfer and pressure drop performance on the air-side of circular finned-tube heat exchangers had been determined numerically. The present study has also concerned for the local flow and heat transfer characteristics and the influence of air flow distribution within the bundles. Various fin heights of annular-finned tube heat exchanger influenced on the heat transfer rate and the pressure drop. Respective results were also presented for the heat transfer rate, the fin efficiency and the effectiveness. Numerical results on the fin height effect for both tube arrays agree well with the previous data in that increasing the fin height provides increased pressure drop of the circular finned-tube bundle. Moreover, it showed that increasing the fin height gives decreased fin efficiency and increased fin effectiveness.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Finned-tube Bundle, Forced Convection, Heat Transfer, Pressure Drop, Numerical.
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 and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Deluxe La
Date Deposited:	04 Aug 2021 08:35
Last Modified:	04 Aug 2021 08:35
URI:	http://repository.its.ac.id/id/eprint/84839

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