Article

Rajesh Satish Waghmare, D.V.V.P.C.O.E.A; H. N. Deshpande ,M. C. O. E.Pune,SPPU; S. Y. Bhosale ,MCOEPune,SPPU,Pune; S. M.Magar ,D. V. V. P. COEA,SPPU,Pune; B. T. Tagad ,D.V.V.P.C.O.E.A

Heat Exchangers are one of the most important engineering systems with various applications like power plants, nuclear reactors, refrigeration and air-conditioning, heat recovery systems; chemical processing and food industries. Basic advantage of helical Coil heat exchanger is its higher heat transfer with compact size, due to secondary flow generation in coil. One of the passive methods of heat transfer enhancement is used here, by changing the design of helical coil. Few investigators have introduced Critical Reynolds number to identify the transition from laminar to turbulent flow in helical coils which is given by Schmidts Co-relation. An attempt is made to change the curvature ratio continuously throughout the coil by using a conical shaped coil in order to decrease the critical Reynolds number. Numerical results of conical coil are compared with straight helical coil by using ANSYS fluent for mass flow rate through coil 0.07kg/s and 0.05 kg/s through shell. From Numerical analysis it is observed conical coil giving 8.71% more heat transfer than straight coil. The mass flow rate range through coil is taken 0.01 kg/s, 0.02 kg/s, 0.05 kg/s, 0.07 kg/s, 0.09 kg/s, 0.1 kg/s keeping mass flow rate through shell 0.05 kg/s constant also tube inlet and shell inlet temperatures maintained same 42ºC and 27ºC respectively and for same mass flow rate heat transfer rate calculated numerically.