International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
Comparative CFD Analysis of Shell and Serpentine Tube Heat Exchanger Subin Michael1 , Kiran K John2, Amal Krishnan2, K K Shanid2 and Melnus Mathew2 1 Assistant
Professor, Department of Mechanical Engineering, Vimal Jyothi Engineering College, Chemperi, Kannur-670632 2Department of Mechanical Engineering, Vimal Jyothi Engineering College, Chemperi, Kannur-670632 ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Heat exchangers are the essential engineering
Usman Ur Rehman [1] studied the flow and temperature fields inside the shell and tubes. He resolved them using a commercial CFD package considering the plane symmetry. A set of CFD simulations is performed for a single shell and tube bundle and is compared with the experimental results. An un-baffled shell-and-tube heat exchanger design with respect to heat transfer coefficient and pressure drop is investigated by numerically modeling. Kwasi Foli [2], in his paper, describes two approaches for determining the optimal geometric parameters of the microchannel in micro heat exchangers. One approach combines CFD analysis with an analytical method of calculating the optimal geometric parameters of micro heat exchangers. The second approach involves the usage of multi-objective genetic algorithms in combination with CFD. Brahim Selma [3] carried out a study to develop an optimized heat pipe exchanger used to improve the energy efficiency in building ventilation systems. The optimized design is based on a validated model used inside a numerical plan built on a design of experiments statistical procedure. The numerical model, built using the open-source package OpenFOAM, is validated through experimental measurements done on a small-scale heat pipe industrial exchanger. The results from the open source model are also compared to the numerical predictions obtained from a commercial code. Nawras H. Mostafa [4], Qusay R. Al-hagag Presented an approach to select the tube wall thickness distribution of streamlined tubes intended for use in heat exchangers is developed in this study. The main goal is to retain a streamlined outer profile (resist deformation) and to prevent strain failure due to the applied internal pressure. The effect of the tube wall thickness distribution on shaped tube efficiency is also considered. Daniel FlĂłrez-Orrego [5], in his work, heat transfer in a non-previously implemented cone-shaped helical prototype with 15cm in maximum diameter, 7.5cm in minimum diameter, 3/8" pitch and 40cmin axial length was analyzed. An empirical correlation for the determination of average Nusselt number along the duct, with Reynolds ranging between 4300 and 18600 has been developed. Also, numerical simulations were performed using ANSYS FLUENT 12.1 software, where the governing equations of mass, momentum and heat transport were solved simultaneously.
systems with wide variety of applications including nuclear reactors, chemical factories, refrigeration systems etc. In this study, we adopt a shell and tube heat exchanger having serpentine type tubes instead of separate straight tubes. ANSYS 16.2 Fluid Flow(Fluent) workbench is used to perform computational fluid dynamics (CFD) simulations. The heat exchanger geometry contains one serpentine tube of outer diameter 30 mm and shell of diameter 200 mm. In this paper, comparison is carried out by adopting different serpentine tube materials (ASTM A 179 Carbon steel and C12200 copper alloy). The changes in temperature profiles in each of the cases are taken into consideration for calculating effectiveness of heat exchanger. Better insights on optimal material selection for vital parts of a heat exchanger is obtained from comparative CFD analysis by adopting distinct industrial materials (ASTM A 179 Carbon steel and C12200 copper alloy). Key Words: CFD, shell and tube, serpentine tube, heat exchanger, effectiveness
1.INTRODUCTION Heat exchange can be occurred between fluids in motion. It is one of the most important physical process. A variety of heat exchangers are employed in different situations. For example, in air conditioning systems, nuclear plants, plywood companies etc. The heat exchanger is intended to perform efficient heat transfer from one fluid to another. It may be either by direct contact or by indirect contact. In this study, a shell and tube heat exchanger equipped with serpentine shaped tube configuration is considered. Comparative CFD analysis is performed by adopting two different serpentine tube materials. The two industrial materials adopted for study are C12200 copper alloy and ASTM A 179 Carbon steel. Different heat exchangers are named according to their area of implementation. For example, condensers are heat exchangers that are used to condense vapours, similarly heat exchanger for boiling of liquids are referred to as boilers. Effectiveness calculation is one of the technique for performance analysis of heat exchangers.
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