CFD Analysis and Performance Evaluation of Concentric Tube in Tube Heat Exchanger - A Review Paper

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IJIRST 窶的nternational Journal for Innovative Research in Science & Technology| Volume 1 | Issue 6 | November 2014 ISSN (online): 2349-6010

CFD Analysis and Performance Evaluation Of Concentric Tube in Tube Heat Exchanger- A Review Paper Jayesh .B Khunt Assistant Professor Mechanical Engineering Department Narnarayan shastri Institute of Technology, Jetalpur

Jalay .R Soni ME Student Mechanical Engineering Department Narnarayan shastri Institute of Technology, Jetalpur

Abstract An objective of the present dissertation work is to design and develop a CAD model of Tube in tube type counter flow Heat exchanger. The Dissertation is about preparing the CAD model as well modifying an experimental setup of tube in tube heat exchanger and use of different type of inner tube configuration for the estimation of heat transfer, pressure drop and change in velocity gradient. The experimental results are compared with the CFD results using CFD package, ANSYS CFX 14.0 A design has been made taking into consideration all the above mentioned Parameters and other real life circumstances which is also a part of this report. Keywords: Helical coil, shell and mandrel, coil pitch, Reynolds number, heat transfer, mass flow rate, CFD simulation. _______________________________________________________________________________________________________

I. INTRODUCTION In chemical industries, heat exchangers are commonplace and allow the exchange or transfer of heat between two fluid streams that are at different temperatures. Usually, the two fluid streams are separated by a metal wall, which is also serves as the heat exchanger surface. Heat exchangers are commonly classified according to flow arrangements and type of construction (Incropera and DeWitt, 2002). Here, the discussion is restricted to the simplest type of heat exchanger - a concentric tube heat exchanger.1.1.1 Concentric Tube Heat Exchangers (CTHX)The concentric tube heat exchanger consists of two tubes that are concentrically arranged. One of the fluid (either hot or cold fluid) flows through the tube and the other through the annulus. For a CTHX, two types of flow arrangements are possible - co-current and counter-current flow. In the parallel or co-current arrangement, the flow direction of the hot fluid will be the same as that of the cold fluid. In the counter-current arrangement, the flow directions of the hot and the cold fluids are opposite to each other.

(a)Co-current or parallel flow (b) Counter-current flow Fig. 1: Flow arrangements in concentric tube heat exchangers (CTHX)

In Figure 1, the cold fluid stream is shown to flow in the inside tube and the hot fluid stream in the annulus, although reverse arrangement is also possible. Prior to discussing the heat transfer in a CTHX, some basic concepts of heat transfer are presented.

(5) One of the key challenges in heat exchanger design and heat transfer calculations is the determination of the thermal resistance or the heat transfer coefficient (h).

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