EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AND FRICTION FACTOR CHARACTERISTICS OF A WATER AND ETHYLENE GLYCOL MIXTURE FLOW OF INTERNALLY GROOVED TUBES

This paper reports experimental investigations on friction factor, Nusselt number and thermal hydraulic performanceof a tube equipped with the classic three modified internally grooved tubes. The working fluid is water and ethylene glycolmixture 90:10 (by weight). Local heat transfer by forced convection from plain and grooved tubes is investigated for Reynoldsnumber ranges 4900 to 13300. The increase in forced convective heat transfer coefficient in water and ethylene glycolmixtures results in a heat exchanger under turbulent flow is also reported. Among the grooved tubes, heat transferenhancement obtained for the flow of water and ethylene glycol mixture is up to 36% for circular grooved tube 55% for squaregrooved tube and 10% for trapezoidal grooved tube in comparison with the plain tube