Flow and heat transfer performance of supercritical methane in an airfoil fin printed circuit heat exchanger
Numerical simulation was carried out to investigate the flow and heat transfer per-formance of the supercritical methane in an airfoil fin printed circuit heat exchanger(PCHE).The flow and heat transfer performance of six different types of NACA00XX airfoil fins were compared and analyzed.The effects of three layout parameters,namely staggered pitch,vertical pitch and horizontal pitch,on the flow and heat transfer performance when the airfoil fins are uniformly distributed were investigated.Three forms of front dense and rear sparse and three forms of front sparse and rear dense non-uniform distributions of airfoil fin were proposed,and their flow and heat transfer performance were compared with that of the uniform distribution.The results show that NACA0025 airfoil fins offer the best com-prehensive performance.When the airfoil fins are uniformly distributed,and when the di-mensionless staggered pitch and dimensionless vertical pitch are 1 and 4 respectively,the comprehensive heat transfer performance is the best.When the airfoil fins are non-uniformly distributed,the comprehensive performance of front dense and rear sparse distributions is better than that of the uniform distribution,while the comprehensive performance of front sparse and rear dense distributions is lower than that of the uniform distribution.The com-prehensive heat transfer performance can be enhanced by arranging denser airfoil fins near the quasi-critical point for keeping the number of airfoil fins constant.
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