Published Paper Details:

An attempt is made here to investigate effect of geometric feature specially curvature ratio and shape of coil by experimentally. The heat transfer analysis of straight helical coil and conical coil heat exchanger with various fluid flow rates and curvature ratio is presented in this paper. Six coils of different geometry and curvature ratio (0.064&0.054) were fabricated. Out of Six, three coils were manufactured by simple circular tube having outside diameter 9.5 mm and inside diameter 8 mm. Remaining three coils were manufactured with same dimensions only addition of notches (inverted fins).The experimentation is carried out for hot and cold water having hot water flow rate 15 Lph, 20 Lph, 25 Lph by keeping cold water flow rate 15 Lph throughout the reading. Temperature Difference was recorded for different mass flow rate across the heat exchanger. The comparative analysis shows that, Nusselt number increases as tube side flow rate increases. It is also reported that Nu Number increases by 5% in coil with notches because notches creates obstacle to fluid flow it creates more turbulence in the flow. Effectiveness of heat exchanger decreases with increase in dean number inside tube in all type of coils. The convective heat transfer coefficient is higher for helical coil than conical and spiral coil. Helical coil with notches having higher curvature ratio is more effective coil than conica coill.