Reza Beigzadeh - CFD Research Center, Chemical Engineering Department, Razi University, Kermanshah, Iran
Mehran Dadfar - Faculty of Energy, Kermanshah University of Technology, Kermanshah, Iran
Babak Aghel - CFD Research Center, Chemical Engineering Department, Razi University, Kermanshah, Iran
Masoud Rahimi

In the present work, heat transfer rate and pressure drop in a shell and coiled tube heat exchanger were evaluated experimentally. The experiments were carried out using a helically coiled tubewith a tube diameter of 0.57 cm, coil diameter of 8.6 cm, and a pitch of 2.4 cm which was placedin a cylindrical shell. The hot water was passed through the tube side and the cold water was passed through the shell side. A set of experiments in the range of Reynolds numbers from 10,000to 31,000 in the tube side and 250 to 1000 in the shell side were carried out. Heat transfer coefficients were calculated using Wilson plot technique. Nusselt number (Nu) and friction factor (f) values were obtained for analyzing the heat transfer rate and pressure drop in the heatexchanger. Moreover, new classical power–law correlations were proposed for estimating the Nu in tube and shell side and also f in the tube side. Correlation constants are then obtained using genetic algorithm (GA) method.

heat exchanger, shell and coiled tube, Wilson plot, Nusselt number, friction factor