International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 08 Issue: 07 | July 2021 www.irjet.net p-ISSN: 2395-0072 © 2021, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 3189 CFD Analysis of Double Pipe Heat Exchanger by Using Perforated Pipe Kunal G Kamble 1 , Babaso N Naik 2 1 M.Tech, Mechanical - Heat Power Engineering, Walchand College of Engineering, Sangli, Maharashtra, India 2 Professor, Department of Mechanical Engineering, Walchand College of Engineering, Sangli, Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Double pipe heat exchanger with corrugation, winglets, inserts, extended surfaces, dimples, nanofluid as well as external energy sources like mechanical vibration, rotation of pipe, etc. are widely used for heat transfer improvement. These methods are grouped in two categories i.e. active and passive methods. In the comparison of active and passive methods, passive methods are easy and simple whereas active methods required special arrangements. Research had been done for various arrangements in heat exchanger and results shown that the active methods produce more heat transfer rate comparing to passive methods, but power consumption & pressure drop also increases significantly. In this paper, The CFD (Computational Fluid Dynamics) analysis is conducted in Ansys Fluent software on Double pipe heat exchanger in which perforated pipe are installed longitudinally in the annulus region for better mixing of fluid, as fluid flows through the holes in the annulus region for heat transfer improvement without significantly increasing pressure drop and comparison was done with various combinations of arrangements of perforated pipe and mass flow rates to identify foremost arrangement. Perforated pipe is taken with 1 mm thickness. The internal fluid was considered as hot fluid whereas in the annulus region fluid was considered as cold fluid. The performance parameters like Heat Transfer rate, Effectiveness, Pressure drop, evaluated for parallel flow condition. Key Words: Double pipe heat exchanger, Heat transfer rate, Perforated pipe, Computational Fluid Dynamics, Eccentric Perforated Pipe. 1. INTRODUCTION Double pipe heat exchangers are widely used in industries because of their simple design and optimal Installation and maintenance cost as well as flexible configuration. The use of accession techniques, such as active and passive, to enhance heat transfer rate and effectiveness in double pipe heat exchanger had been explored in a while. Passive techniques are most commonly used in double pipe heat exchanger are spiral spring insert, Fins, twisted tape, helical wire insert, corrugated tube, baffles, vortex generator, turbulator [1-20]. Whereas in active methods use of mechanical aids, magnetic fields are linked, which commit external power source for heat transfer improvement [10,42,49,51]. Extended surfaces are the most common nomenclature used to improve heat transfer rate by convection phenomenon with an increase in the surface area. Li Zhang et al. [1] experimentally and numerically investigated the fluid flow characteristics of a double pipe heat exchanger with the use of helical and pin fins and measured the three-dimensional velocity components by using a laser doppler anemometer. Mohsen Torabi et al. [2] examined fins of different geometrical shapes with a combination of arrangements. They established the performance characteristics of these fins for different thermal conductivities, emissivity, and convection conduction parameters. Z. Iqbal et al. [3] ascertain optimal fin shape for a finned double pipe in fully developed laminar flow with the aim of maximizing the Nusselt number and they presented and discussed the optimal profiles. However, installing fins in the heat exchanger makes cleaning and maintenance more complex. H.A. Mohammed et al. [4] investigated the effect of geometric parameters and adding nanoparticles to working fluid on heat transfer. The results indicate wire coil diameter affects heat transfer rate, as wire coil diameter decreases results in an increment in heat transfer rate. Whereas the amount of coil pitch does not have a significant effect on heat transfer rate. Khashayar Sharifi [5] conducted computational fluid dynamics (CFD) analysis to study the effect of coiled wire inserts on the friction coefficient, Nusselt number, and overall efficiency in double pipe heat exchanger. It is observed that the presence of the wires culminates in an increase in pressure drop and friction coefficients in all of the heat transfer processes. J. P. Chiou et al. [6] investigated the effect of coiled wire inserts in chilling horizontal heat exchangers filled with oil. Researcher observed that heat transfer rate is increased due to disturbing laminar sub -ayer near the surface. Twisted tapes are used in heat exchanger as they direct the flow and increase the effective length of flow, results in an improvement in heat transfer rate by swirl and vortex flow generated by twisted tape design. M. Sheikholeslami et al. [7] presented an experimental and numerical investigation on convective heat transfer and friction loss in a double pipe heat exchanger with perforated turbulators in the annulus region. Observation showed that the thermal performance enhances with increasing open area ratio, while temperature gradient reduces with augmenting of pitch ratio. Ranjith et