Frictional heat transfer regularity of the fluid film in mechanical seals

Abstract

The frictional heat transfer regularity in the mechanical seal system consisting of the rotating ring, the stationary ring, the fluid film in the end faces and the sealed medium was investigated. The primary factors affecting the frictional heat transfer regularity, such as the heat transfer coefficients from the rings to the sealed medium, the frictional heat flux, the frictional heat distribution ratio and so on, were discussed. The equations for calculating the temperature field both in the sealing members and in the fluid film were derived. The coupling analysis of the frictional heat of the fluid film and the thermal deformation of the two end faces of the rings was carried out to obtain the separation angle of the two deformed end faces in consideration of the viscosity change of the fluid film. The results indicate that the frictional heat of the fluid film heavily affects its characteristic and the sealing performance of mechanical seals. The frictional heat changes not only the shape of the gap between the end faces but also the viscosity of the fluid film, and thereupon leads to the increase of the leakage rate. The maximum temperature of the system is at the inner radius of the fluid film, and most of the frictional heat is conducted by the rotating ring. Based on the heat transfer analysis method put forward in this paper, the parameterized design of mechanical seals can be realized to determine the best geometrical parameters and to select the appropriate material of the sealing members. mechanical seal, heat transfer, frictional heat, coupling analysis

An analytical approach to heat transfer and thermal distortions in non-contacting face seals

“…[13,14], the development of the mathematical model of the non-contacting face seal required some simplifying assumptions, and these included:…”

Influence of Thermoelastic Phenomena on the Energy Conservation in Non-contacting Face Seals

“…The seal consists of two rings: a rotor (2), flexibly mounted to the shaft (6) of the turbomachine, and a stator (1), fixed to the housing. The mathematical model describing the physical phenomena occurring in the sealing rings-fluid film system of a non-contacting face seal was developed using some simplifications, like in [9][10][11][12]. The formulated model was then solved analytically.…”

Thermomechanical coupled analysis of split mechanical seal under different rotation speeds

“…Here, although the oblique surfaces of the trapezoid ring groove contact with hoops, each groove has a large clearance filled with air at the bottom (shown in Figure 1), the size of hoops are large enough, and its conductivity of the stainless material is not good; therefore, the oblique surfaces are also assumed to be adiabatic. With the hypothesis of no effect of parting surfaces on the convection, the existing expressions, 17,18 for calculating the convective heat transfer coefficients of integral seal ring, are applied on the present split seal. The heat flux generated on the primary sealing interface is also calculated by empirical expression.…”

“…This study estimates convective heat transfer coefficients and frictional heat by expressions [16][17][18][19][20] and reasonably presets external forces and constraints. Based on these, simulations for the temperature distribution and thermomechanical coupled deformation of both split and integral mechanical seal models are conducted by ANSYS Workbench.…”