Predicting Turbulent Flow In A Staggered Tube

Mohd Adib Muizzuddin, Mohlis (2008) Predicting Turbulent Flow In A Staggered Tube. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This report is about predicting turbulent flow in a staggered tube using Computational Fluid Dynamic software developed by Ansys which is the CFX. Either CFX, there are many non computational dynamic methods that can predict the heat transfer and flow characteristic such experimental and analytical method. But using Computer Fluid Dynamic software can save time and cost because only virtual model were create and simulate. The aims of this study are to predict the fluid flow and heat transfer characteristic in a staggered tube air and water as the fluid. The flow and heat transfer characteristic of a staggered tube a nearly the same of a single cylinder/tube. The first row characteristic is usually the same as a single tube. But for the second row and so on, the characteristic are depends on the rows that’s come first. For a single tube actually there are two boundary layers which occur at front of the tube and the back of the tube. Laminar boundary layer always developed at the front while turbulent at the back. Several geometrical parameters have been defined according to the previous research (journals) done in order to design the staggered tube geometry. The other parameters such as the fluid velocity and temperature are also defined according to the previous research. With these parameters a simulation can be made using CFX. There are several process in CFX which are the CFX Preprocessing, CFX solver and CFX post processing. The results obtain are in terms of velocity, temperature and pressure profile. From the investigation lower value of pitch used will results better heat transfer rate. When the pitch value is decrease, the pressure drop will rise and thus will increase the heat transfer rate. In engineering application higher pressure drop value will result higher power required to move the fluid through the tube bank.

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