Theoretical Study of Single Phase Heat Transfer in a Helically Coiled Tube of Small Diameter

Abstract

In recent years, heat transfer enhancement techniques have become one of the main thermal research fields. Helically coiled configuration is more preferable due to their large heat transfer area in a small space, higher heat transfer coefficients and longer operating life. In this research article, theoretical analysis has been conducted to investigate the heat transfer characteristics of single phase laminar flow in a helically coiled tube of small diameter. This work deals with analysis of the coiled tube with different correlations developed for specific conditions by previous researchers. The present analysis follows similar trend for heat transfer coefficient as reported by previous authors. Water is more feasible than nitrobenzene because of its higher heat transfer coefficient.

Chemical and Process Engineering

“…The heat exchanger is one of the key devices in chemical, petroleum, refrigeration, food, power generation and nuclear industries as well as in air-conditioning and heat recovery systems. It can be used in sterilization, pasteurization, cryogenic, crystallization, separation (distillation) and reaction processes (Nada et al, 2016;Pandey et al, 2015).…”

“…Coil curvature ratio and the Reynolds number govern the flow in coiled tubes. The former parameter is defined as the ratio of coil to tube diameters, whereas the other as the ratio of inertia to viscous forces (Pandey et al, 2015). The Dean (De) number is the product of the Reynolds number and the square root of the curvature ratio.…”

Design and Thermal Evaluation of Shell and Helical Coil Heat Exchanger

“…An analytical and experimental study has carried out by Shokouhmand et al [11] done experimental investigation on shell and coil tube heat exchanger using Wilson plot technique and inner heat transfer coefficient so obtained are found in good agreement. Pandey et al [12] study hydrodynamic characteristics of single phase fluid flow inside a vertical helically coiled tube of curvature ratio 0.012 is investigated experimentally for the laminar flow regime for water and nitrobenzene. Purandare et al [13] had done the comparative analysis of various correlations given by different researchers.…”