scholarly journals CFD Application on Shell and Double Concentric Tube Heat Exchanger

2019 ◽  
Vol 25 (2) ◽  
pp. 136-150
Author(s):  
Basma Abbas Abdulmajeed ◽  
Hawraa Riyadh Jawad
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Exchanger ◽  
Cold Water ◽  
Percentage Error ◽  
Outlet Temperature ◽  
Discrete Elements ◽  
Tube Heat Exchanger ◽  
Heat Exchanger Design ◽  
Solid Works

This work is concerned with the design and performance evaluation of a shell and double concentric tubes heat exchanger using Solid Works and ANSY (Computational Fluid Dynamics). Computational fluid dynamics technique which is a computer-based analysis is used to simulate the heat exchanger involving fluid flow, heat transfer. CFD resolve the entire heat exchanger in discrete elements to find: (1) the temperature gradients, (2) pressure distribution, and (3) velocity vectors.  The RNG k-ε model of turbulence is used to determining the accurate results from CFD. The heat exchanger design for this work consisted of a shell and eight double concentric tubes. The number of inlets are three and that of outlets are also three for all the fluids that pass through the heat exchanger. A comparison was made for the numerical and experimental results and it was found that the percentage error for the hot oil outlet temperature was (6.8%) and the percentage error was (- 21%) for cold water outlet temperature.  

scholarly journals STUDI EKPERIMENTAL DAN SIMULASI PENGARUH SUDUT DOUBLE SEGMENTAL BAFFLE DAN LAJU ALIRAN MASSA FLUIDA PADA HEAT EXCHANGER TYPE SHELL AND TUBE TERHADAP PERPINDAHAN PANAS

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Muhammad Syafi’i ◽  
Tabah Priangkoso ◽  
Darmanto Darmanto
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Exchanger ◽  
Tube Heat Exchanger ◽  
Shell And Tube

Shell and tube heat exchanger (STHX) merupakan jenis penukar kalor yang banyak digunakan di industri. Namun, peningkatan performa penukar kalor ini perlu dilakukan dengan cermat karena alirannya yang kompleks di dalam shell. Shell-and-Tube Heat Exchanger berfungsi untuk menukar energi dalam bentuk panas antara fluida yang berbeda Temperature yang dapat terjadi melalui kontak langsung maupun tidak langsung. Fluida yang bertukar energi dapat berupa energi yang fasenya sama (cair ke cair atau gas ke gas) atau dua fluida yang berbeda fasenya. Penelitian ini mengkaji peningkatan performa dalam bentuk koefisien perpindahan panas total dan efektivitas dengan melakukan variasi sudut baffle menggunakan pendekatan eksperimen. Penukar kalor diuji pada laju aliran massa 0,5; 1; 1,5; dan 2 kg/s dengan variasi sudut baffle 0°, 10°, dan 20°. Pada pengujian eksperimen maupun simulasi semakin kecil sudut baffle maka semakin besar nilai efektivitasnya dan semakin besar laju aliran massa maka semakin besar pula nilai koefisien perpindahan panas totalnya. Pada pengujian simulasi nilai efektivitas dengan sudut baffle 0° memiliki nilai maksimal 1,82% dengan nilai koefisien perpindahan panas total 1607 W/m².K, 10° memiliki nilai 1,79% dengan nilai koefisien perpindahan panas total 1581 W/m².K, dan 20° memiliki nilai 1,70% dengan nilai koefisien perpindahan panas total 1460 W/m².K, nilai efektivitas pada pengujian eksperimen dengan sudut baffle 0° memiliki nilai maksimal 1,38% dengan nilai koefisien perpindahan panas total 741,54 W/m².K, 10° memiliki nilai 1,29% dengan nilai koefisien perpindahan panas total 740,56 W/m².K, dan 20° memiliki nilai 1,14% dengan nilai koefisien perpindahan panas total 739,21 W/m².K. Kata Kunci: Computational Fluid Dynamics, double segmental baffle, STHX, sudut baffle

The Effect of Fin Geometry on Design of Compact Off-Set Strip Fin High Temperature Heat Exchanger

2005 ◽  
Author(s):  
Sundaresan Subramanian ◽  
Valery Ponyavin ◽  
Clayton Ray De Losier ◽  
Yitung Chen ◽  
E. Hechanova ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Exchanger ◽  
Transfer Enhancement ◽  
Heat Exchanger Design ◽  
Helium Gas ◽  
Temperature Heat ◽  
Overall Performance ◽  
Offset Strip Fin

This paper deals with the development of a three-dimensional numerical model to predict the overall performance of an advanced high temperature heat exchanger design, up to 1000°C, for the production of hydrogen by the sulfur iodine thermo-chemical cycle used in advanced nuclear reactor concepts. The design is an offset strip-fin, hybrid plate compact heat exchanger made from a liquid silicon impregnated carbon composite material. The two working fluids are helium gas and molten salt (Flinak). The offset strip-fin is chosen as a method of heat transfer enhancement due to the boundary layer restart mechanism between the fins that has a direct effect on heat transfer enhancement. The effects of the fin geometry on the flow field and heat transfer are studied in three-dimensions using Computational Fluid Dynamics (CFD) techniques. The pre-processor GAMBIT is used to create a computational mesh, and the CFD software package FLUENT that is based on the finite volume method is used to produce the numerical results. Fin dimensions need to be chosen that optimize heat transfer and minimize pressure drop. Comparison of the overall performance between two fin shapes (rectangular versus curved edges) is performed using computational fluid dynamics techniques. Fin and channel dimensions need to be chosen such as to optimize heat transfer performance and minimize pressure drop. The study is conducted with helium gas and liquid salt as the working fluids with a variety of Reynolds number values and fin dimensions. Both laminar and turbulent modeling is performed for the helium side fluid flow. The effect of the fin geometry is performed computational fluid dynamics techniques and optimization studies are performed. The model developed in this paper is used to investigate the heat exchanger design parameters in order to find an optimal design.

scholarly journals Optimization and CFD analysis of a shell-and-tube heat exchanger with a multi segmental baffle

2020 ◽  
pp. 293-293
Author(s):  
Ahmet Aydin ◽  
Halit Yaşar ◽  
Tahsin Engin ◽  
Ekrem Büyükkaya
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Exchanger ◽  
Flow Field ◽  
Heat Exchangers ◽  
Operating Cost ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
Shell And Tube ◽  
Side Flow

The Shell-and-tube type heat exchangers have long been widely used in many fields of industry. These types of heat exchangers are generally easy to design, manufacturing and maintenance, but require relatively large spaces to install. Therefore the optimization of such heat exchangers from thermal and economical points of view is of particular interest. In this article, an optimization procedure based on the minimum total cost (initial investment plus operational costs) has been applied. Then the flow analysis of the optimized heat exchanger has been carried out to reveal possible flow field and temperature distribution inside the equipment using computational fluid dynamics. The experimental results were compared with computational fluid dynamics analyses results. It has been concluded that the baffles play an important role in the development of the shell side flow field. This prompted us to investigate new baffle geometries without compromising from the overall thermal performance. It has been found that the heat exchanger with the new baffle design gives rise to considerably lower pressure drops in the shell side, which in turn reducing operating cost. The new baffle design is particularly well suited for shell-and-tube heat exchangers, where a viscous fluid flows through shell side with/out phase change.

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