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The objective of this study is theoretically to suggest the effective heat exchanger design method using boundary layer analysis. The boundary layer formation and interruption on rectangular plate and round plate fins are explained and the heat transfer coefficients showed with the variation of the velocity and temperature boundary layer. In addition, the flow pattern on one plate fin surface considered as external flow and flow pattern between fins considered as internal flow. As a result, theoretical method for the boundary layer interruption avoidance is suggested and the heat transfer coefficient of the round plate fin was higher than that of the rectangular plate fin because of the less thermal and velocity boundary layer thickness except the centerline. Key Words : Boundary layer, Heat exchanger, Heat transfer coefficient, Interruption, Plate fin    ()     . * Corresponding Author : Moo-Yeon Lee (Dong-A University)Tel: +82-10-5440-8421 email: mylee@dau.ac.krReceived September 18, 2012 Revised (1st September 27, 2012, 2nd October 12, 2012) Accepted December 12, 2012

Theoretical approach on the effective heat exchanger design using boundary layer theory