Experimental study on thermal analysis of helical coil heat exchanger using Green synthesis silver nanofluid

Green Synthesis of silver nano particles using Neem leaf extracts and preparation of nanofluid, heat transfer, pressure drop and friction factor for helical coil heat exchanger have been experimentally investigated and compared with the standard correlation given by various researchers is discussed in this paper. Inlet temperatures of hot water on coil side and cold water on shell side were maintained at around 58 degrees C and 32 degrees C respectively. Experiments were performed over the Dean number range on shell side is 1000 to 3000, by varying mass flow rate and Reynolds number on coil side is kept constant at 5780. Thermal analysis has been carried out by considering various parameters such as temperature, flow rate, overall heat transfer coefficient. Use of green synthesized Nano particles have shown enhancement of 32% in heat transfer coefficient compared to base fluid. Thermal performance factor has been slightly decreased with increase in concentration and is feasible to use 0.05% of concentration nanofluid. (C) 2020 Elsevier Ltd. All rights reserved.