Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

► Nusselt numbers of shear thinning solutions are slightly higher than those of Newtonian fluids. ► Nusselt numbers of elastic solutions are lower than those of Newtonian fluids. ► A correlation for Newtonian and non-Newtonian fluids is presented.