SURFACE ROUGHNESS EFFECTS ON FLOW BETWEEN STATIONARY- AND ROTATING DISCS

EL-Batran, A. I.; EL-Kadi, M.; Hewedy, H. I.I.; Khalifa, B. A.

doi:10.21608/asat.1991.25673

SURFACE ROUGHNESS EFFECTS ON FLOW BETWEEN STATIONARY- AND ROTATING DISCS

Document Type : Original Article

Authors

¹ Graduate student, of Mechanical Power Engineering, Faculty of Engineering &Tech , Henoufia University, Shebin El-Noia, Egypt .

² Lecturer, of Mechanical Power Engineering, Faculty of Engineering &Tech , Henoufia University, Shebin El-Noia, Egypt .

³ Professor, Department of Mechanical Power Engineering, Faculty of Engineering &Tech , Henoufia University, Shebin El-Noia, Egypt .

10.21608/asat.1991.25673

Abstract

The turbulent outward fluid flow between stationary and a rotating disc enclosed by a cylindrical housing has been investigated experimentally . This type of flow occurs in many applications of engineering interests . Most of the flows enco-untered in practice are turbulent specially in turbo-machinery. The effect of surface roughness on the friet.ional voment of the rotating disc as well as on the radial pressure distributi-ons has been investigated for different relative roughness ratios of the rotating disc CR/k),16005CR/k35I6401 . Here k is the mean particle diameter of the used grain size and R is the outer disc radius . The flow is investigated at a dimensionless gap height CID of 10.013 SCHmh/10.15 0.401, mass flow coefficient CCw er 11.0x103 5CCwapWeR35 4.2x103 and rotational Reynolds number (Re) of 13x1055 (Re•peR2/0)5. 1.21x 1061. Radial pressure and frictional moment for rough discs are compared with the experimental results obtained on smooth rotating discs . The results have showed that the surface roughness affects strongly upon the radial pressure distribution, the frictional moment and the axial thrust force .