Numerical Prediction of Heat Transfer Coefficient by Karman's Analogy and an Application for Air-cooled Motorcycle's Engines

Abstract

To analyze a cooling performance of air-cooled motorcycle's engines, we used the Karman'sanalogy between the fluid friction and the heat transportation. The Partial Cells in Cartesian coordinate method were employed as a CFD calculation. The calculated heat transfer coefficients at the flow in a straight pipe were compared with the Colburn's empirical formula. As a result, in Pr=0.7 and 104<Re<1.2×105, the values were almost agreed within±10% errors. Furthermore, as an application example, distributions of local heat transfer coefficients of an air-cooled motorcycle's engine were analyzed. It was helpful to examine the characteristic of heat radiation.