Investigation of the effect of conical type turbulators in a heat exchanger on heat transfer and pressure loss

In this thesis, the effects of conical type turbulators placed on the inner pipe of a coaxial heat exchanger on heat transfer and pressure loss were investigated experimentally. The design parameters used in the experiments were diameter, conical type and number of steps. The experiments were carried out in the range of 18000-37000 of the Reynold number. By using Taguchi Experimental Design method, the effects of turbulators on heat transfer and pressure loss were examined and entropy, efficiency, NTU, dimensionless exergy values and thermal performance factor were calculated. In addition, ANOVA ( Analysis of Variance ) was used to determine the effects of the design parameters used in the experiments on pressure drop and heat transfer as a percentage. Optimum levels of the parameters were obtained with Taguchi method for both heat transfer and pressure loss. In order to determine multiple performance characteristics, the effects of the parameters on heat transfer and pressure loss were determined by Gray Relational Analysis method.