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ITS » Master Theses » Rekayasa Konversi Energi - S2
Posted by dee@its.ac.id at 15/11/2014 00:16:01  •  942 Views


STUDI NUMERIK KARAKTERISTIK ALIRAN DAN PERPINDAHAN PANAS PADA U-TUBE HEAT EXCHANGER 3D DENGAN VARIASI STRAIGHTEN PLATE DI DAERAH INLET DAN VARIASI PANJANG TUBE

NUMERICAL STUDY OF FLOW CHARACTERISTICS AND HEAT TRANSFER IN 3D U-TUBE HEAT EXCHANGER WITH STRAIGHTEN PLATE VARIATION IN THE INLET REGION AND TUBE LENGTH VARIATION

Author :
HADIWIJAYA, LUKMAN ( 2111202002 )




ABSTRAK

U-Tube Heat Exchanger merupakan jenis alat penukar panas yang paling banyak dijumpai penggunaannya di dalam proses industri seperti pada feed water heater. U-tube digunakan untuk memberikan luasan per volume yang sangat besar dari sistem perpindahan panas. Perpindahan panas secara konveksi terjadi antara permukaan dinding tube dan fluida yang mengalir di sepanjang tube dimana keduanya memiliki perbedaan temperatur. Karakteristik aliran di dalam tube berperan penting dalam desain alat penukar panas. Penelitian ini bertujuan untuk mengevaluasi karakteristik aliran dan perpindahan panas pada u-tube heat exchanger 3D yang mengalami sudden expansion setelah pemasangan straighten plate dengan variasi rasio diameter inlet tube yaitu dD 06 dan dD 05. Ini dibandingkan dengan u-tube original yaitu D 16 mm. Variasi panjang tube L 5 m dibandingkan dengan L 2 m. Temperatur dinding tube dijaga konstan pada Ts 50 C 323 K temperatur air masuk Tin 27 C 300 K mass flow rate 119898 02 kgs. Penelitian ini menggunakan metode numerik dengan software Fluent 6.3.26 dan turbulence model yaitu standard k-603. Hasil numerik menunjukkan bahwa straighten plate dengan variasi rasio diameter inlet tube dD mampu meningkatkan turbulensi aliran dan kemampuan perpindahan panas. Tube dengan rasio dD05 dan L5m menghasilkan kenaikan Tout yang paling tinggi sebesar o4 sedangkan akibat variasi straighten plate pada tube L2m kenaikan Tout lebih signifikan yaitu sebesar 22 .


ABSTRACT

U-Tube Heat Exchangers are the most versatile type of heat exchangers. They are used in process industries such as in feed water heaters. U-tube is used to achieve a very large heat transfer area per unit volume. The process of convection heat transfer a surface and a fluid flowing past it that both are different temperatures. Flow characteristics play a vital role in the design of many heat related applications where heat transfer concerned. This study aimed to evaluate the flow characteristics and heat transfer in 3D u-tube heat exchanger which experiences sudden expansion after straighten plate mounting with the variation of the tube inlet diameter ratio is dD 0.6 and dD 0.5. They are compared with the original tube D 16 mm. Tube length variation L 5 m compared with L 2 m. Surface temperature is kept constant at Ts 50 C 323 K water inlet temperature Tin 27 C 300 K mass flow rate 0.2 kgs. In the present work numerical study is performed using numerical methods with software Fluent 6.3.26 and standard k-603 turbulence models. The numerical results show that straighten plate mounting with the variation of the tube inlet diameter ratio dD enhancement of turbulence and increase heat transfer rate. Tube rasio dD0.5 and tube length L5m provide the higgest ouput temperature increase 0.4 and more significant ouput temperature increase 2.2 at tube rasio dD0.5and tube length L2m.



Keywordsu-tube heat exchanger 3D; feed water heater; sudden expansion; nusselt number
 
Subject:  Transmisi panas
Contributor
  1. Prof. DR. Eng. Ir. Prabowo, M. Eng
  2. Prof. Ir. Sutardi, M. eng., Ph. D
Date Create: 24/01/2014
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Master-21103140000958
Collection ID: 21103140000958
Call Number: RTM 621.402 Had s


Source
Master Thesis of Mechanical Engineering, RTM 621.402 Had s, 2014

Coverage
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Rights
Copyright @2014 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-33708-2111202002-abstract_id.pdf - 366 KB
  2.  ITS-Master-33708-2111202002-abstract_en.pdf - 217 KB
  3.  ITS-Master-33708-2111202002-conclusion.pdf - 397 KB




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