TY - JOUR
T1 - Numerical investigation of cavitation effect on two-phase oil film flow between a friction pair in hydro-viscous drive
AU - Xie, Fangwei
AU - Zheng, Xudong
AU - Sheng, Gang
AU - Sun, Qi
AU - Agarwal, Ramesh K.
N1 - Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to acknowledge the support of the National Natural Science Foundation of China (51675234), and the Open Foundation of the State Key Laboratory of Fluid Power and Mechatronic Systems of Zhejiang University (GZKF-201717). The visit of the first author to Washington University in St. Louis, USA is supported by China Scholarship Council. The resources provided by the Washington University are gratefully acknowledged.
Publisher Copyright:
© IMechE 2018.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - This paper describes a three-dimensional computational model of oil film between a friction pair to investigate the characteristics of both single-phase and two-phase flow of the oil film in hydro-viscous drive. For the single-phase oil film, the distribution of pressure is very regular from inlet to outlet of the friction pair; its value decreases gradually. On the other hand, the temperature in the middle part of the oil film is considerably lower and the velocity increases at a faster rate near the outlet and has a parabolic profile, which is mainly caused by both the shear stress and extrusion force. By comparison, the physical phenomena at the outlet of the oil film are entirely different for two-phase flow with cavitation. For two-phase simulation of flow with cavitation, we first obtain the volume fraction of air bubbles at rotation speeds of 500, 1000, 2000, 3000, and 4000 revolutions/min. With increase in the rotation speed, the volume fraction of air bubbles increases, and their maximum value becomes even greater than 10%. Furthermore, due to cavitation, the torque transferred by the oil film is no longer linear with the rotation speed; its value decreases gradually. These results are important in the study of hydro-viscous drive and its applications; they shed a new light on the mechanism of power transmission through oil film in the presence of cavitation.
AB - This paper describes a three-dimensional computational model of oil film between a friction pair to investigate the characteristics of both single-phase and two-phase flow of the oil film in hydro-viscous drive. For the single-phase oil film, the distribution of pressure is very regular from inlet to outlet of the friction pair; its value decreases gradually. On the other hand, the temperature in the middle part of the oil film is considerably lower and the velocity increases at a faster rate near the outlet and has a parabolic profile, which is mainly caused by both the shear stress and extrusion force. By comparison, the physical phenomena at the outlet of the oil film are entirely different for two-phase flow with cavitation. For two-phase simulation of flow with cavitation, we first obtain the volume fraction of air bubbles at rotation speeds of 500, 1000, 2000, 3000, and 4000 revolutions/min. With increase in the rotation speed, the volume fraction of air bubbles increases, and their maximum value becomes even greater than 10%. Furthermore, due to cavitation, the torque transferred by the oil film is no longer linear with the rotation speed; its value decreases gradually. These results are important in the study of hydro-viscous drive and its applications; they shed a new light on the mechanism of power transmission through oil film in the presence of cavitation.
KW - cavitation
KW - friction pair
KW - hydro-viscous drive
KW - multi-phase flow
KW - Oil film
KW - torque transfer
UR - http://www.scopus.com/inward/record.url?scp=85045439216&partnerID=8YFLogxK
U2 - 10.1177/0954406218756438
DO - 10.1177/0954406218756438
M3 - Article
AN - SCOPUS:85045439216
SN - 0954-4062
VL - 232
SP - 4626
EP - 4636
JO - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
JF - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
IS - 24
ER -