나선형 EGR Cooler의 Pitch 길이 변화에 따른 열전달 특성에 관한 수치 해석

To enhance heat transfer characteristics of EGR, a numerical study on the effect of pitch variation to EGR is conducted. The commercial code FLUENT is utilized to simulate single spiral tube with constant wall temperature. The numerical analysis is performed with various mass flow rate. The results show that as pitch of the tube is smaller, the heat transfer becomes stronger due to turbulent flow. The heat transfer characteristics is mostly dominated by not mass flow rate but pitch. The general correlation is derived in Nusselt number, Reynolds number, and pitch. This correlation agrees well within 3% of maximum error.