Laminar Forced Convection Heat Transfer From Isothermal Bodies With Unity Aspect Ratio in Coaxial Air Flow

In this article a semianalytical approach is employed to obtain dimensionless heat transfer correlations for forced convection over three geometries—sphere, cone, and cylinder with unity aspect ratio in laminar axial air flow. The comparison of the present results for a sphere with the previous work shows very good agreement. For example, the average difference between the results of the present model and those of Ahmed and Yovanovich and of McAdams are 4.3% and 0.8%, respectively. Validation of the results for cone and cylinder was done based on available data on drag coefficients. Finally, a general correlation is developed for a rough estimate of forced convection from isothermal bodies of unity aspect ratio and coaxial with the airflow.