Investigation of the Constant of Surface Roughness Function.

Authors

Samir Hanna, Electrical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
Berge Djebedjian, Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., El-Mansoura 35516., Egypt.Follow

Corresponding Author

Hanna, Samir

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

The main objective of this paper is to throw some light on the constant of surface roughness function. Many investigators related that constant to the surface roughness density defined as the ratio of the total surface area is the roughness area. Others introduced alternative definition, to be the ratio of the total surface area to the total roughness frontal area normal to the flow. The influence of pressure gradient is not considered by those investigators. Moreover, they suggested a unique value for this constant in the presence of pressure gradient. In this research, the analytical study of the constant of surface roughness function regarding the pressure gradient in form of Euler number. shows variable values for different ratios of k / ẟ٭٭.

Recommended Citation

Hanna, Samir and Djebedjian, Berge (2021) "Investigation of the Constant of Surface Roughness Function.," Mansoura Engineering Journal: Vol. 10 : Iss. 1 , Article 9.
Available at: https://doi.org/10.21608/bfemu.2021.176997