International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 03 | Mar -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1660 CFD Analysis of Heat Transfer in Helical Coil Syed Mohammed Arif 1 , Prof. Rashed Ali 2 , Dr. Dhanraj P. Tambuskar 3 , Prof. Divya Padmanabhan 4 1 Research Scholar, Dept. of Mechanical Engineering, Pillai College of Engineering, Maharashtra, India 2 Professor, Dept. of Mechanical Engineering, Pillai College of Engineering, Maharashtra, India 3 Head of the Dept., Dept. of Mechanical Engineering, Pillai College of Engineering, Maharashtra, India 4 Professor, Dept. of Mechanical Engineering, Pillai College of Engineering, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - The purpose of this research is to study the effect of coil diameter and inlet temperature of steam on the heat transfer coefficient in the helical coil. The study was based on fluid to fluid heat transfer. CFD analysis was carried out for two different mass flow rate of water. Heat transfer coefficient was calculated for various inlet temperatures ranging from 100-105°C. A CFD simulation was carried out for three different coils. The results show that there is an increase in heat transfer coefficient with the increase in inlet temperature of steam. Key Words: CFD, Heat Transfer Coefficient, Helical Coil, Mass Flow Rate 1. INTRODUCTION A helical coil has a wide range of application in industries over the straight tube because of its greater heat transfer, mass transfer coefficient and higher heat transfer capability, etc. The relevance of helical coil has been identified in industrial application like automobile, aerospace, power plants turbine etc. because of above mentioned factors. Lots of researches are going on to improve the heat transfer coefficient of the helical coil. In this paper numerical study of helical coil is done for different boundary conditions and optimizes condition of heat transfer coefficient is found out for different coil diameter. The turbulent flow standard k-ε model is considered for analysis purpose. The effect of coil diameter on heat transfer coefficient is found out for different boundary conditions. Rustum and Soliman did an early study in 1990. Shah obtained some reliable results in 2000. Grijspeerdt et al., did design optimization for heat exchangers using CFD as a tool in 2003. Van der vyver et al., did heat exchanging process in tube-in-tube heat exchanger using STAR-CD in 2003 and for Fractal heat exchangers the same code was applied for performance evaluation. Flavio et al., determined heat transfer coefficient for plate type heat exchanger in series and parallel configurations by both experimental and numerical techniques in 2006 using Fluent 6.1for numerical analysis. Rennie and Raghavan carried out Numerical analysis of double piped heat exchangers in 2005. Kumar et al., carried out Hydrodynamics and heat transfer characteristics of double pipe in fluent for helical coil in 2006[1]. Curved tubes are widely used passive heat transfer enhancement technique in several heat transfer applications. Heat transfer enhancement by using helical coil has been researched and studied by many researchers. Various helical coil configurations are possible, and the most common configuration is of vertically stacked helically coiled tube. Boundary conditions like constant heat flux or constant wall temperature were considered for investigations carried out on heat transfer coefficients. In this study the boundary condition considered is constant wall temperature. In spite of their abundant use in industrial application, there is limited computational information and correlations available in literatures on fluid to fluid heat transfer. Yang and Ebadian used the k-ε model to analyse the fully-developed turbulent convective heat transfer in a helical pipe with finite pitches. The result shows that as the coil pitch increases, temperature distribution in a cross-section of coiled tube becomes asymmetrical . The standard k-ε model was used by Lin and Ebadian for investigate of the convective heat transfer in the developing portion of helical pipes having finite pitches. For development of heat transfer phenomena effects of pitch, curvature ratio and Reynolds (Re) number were also discussed [2]. 2. LITERATURE REVIEW It is found that in the literature the research works dealing with two-phase flows in helical pipe are few. Out of these also, the majority handle pressure drop in such systems.This chapter presents a review of the research done on heat transfer in helical coils dealing with two- phase flow. Several studies found that helical coiled tubes are better than straight tubes when used for heat transfer applications. A validation of experimental work of condensation heat transfer in helical coils is presented. Raghavan (2006) studied that, for numerical study of heat transfer characteristics of a double-pipe helical heat exchanger for both parallel flow and counterflow by using a computational fluid dynamics package (PHOENICS 3.3).