Forced convection in three-dimensional flows: III. Asymptotic solutions with viscous heating

AIChE Journal ◽  
1983 ◽  
Vol 29 (6) ◽  
pp. 947-956 ◽  
Author(s):  
W. E. Stewart ◽  
M. A. McClelland
Keyword(s):  
Forced Convection ◽  
Three Dimensional ◽  
Asymptotic Solutions ◽  
Viscous Heating

Forced convection in three-dimensional flows: II. Asymptotic solutions for mobile interfaces

AIChE Journal ◽  
1970 ◽  
Vol 16 (5) ◽  
pp. 771-786 ◽  
Author(s):  
W. E. Stewart ◽  
J. B. Angelo ◽  
E. N. Lightfoot
Keyword(s):  
Forced Convection ◽  
Three Dimensional ◽  
Asymptotic Solutions ◽  
Mobile Interfaces

Three-Dimensional Forced Convection in Plane Symmetric Sudden Expansion

2004 ◽  
Vol 126 (5) ◽  
pp. 836-839 ◽  
Author(s):  
J. H. Nie and ◽  
B. F. Armaly
Keyword(s):  
Nusselt Number ◽  
Forced Convection ◽  
Reverse Flow ◽  
Three Dimensional ◽  
Flow Region ◽  
Outer Edge ◽  
Sudden Expansion ◽  
Recirculation Flow ◽  
Plane Symmetric ◽  
Laminar Forced Convection

Simulations of three-dimensional laminar forced convection in a plane symmetric sudden expansion are presented for Reynolds numbers where the flow is steady and symmetric. A swirling “jetlike” flow develops near the sidewalls in the separating shear layer, and its impingement on the stepped wall is responsible for the maximum that develops in the Nusselt number adjacent to the sidewalls and for the reverse flow that develops in that region. The maximum Nusselt number on the stepped wall is located inside the primary recirculation flow region and its location does not coincide with the jetlike flow impingement region. The results reveal that the location where the streamwise component of wall shear stress is zero on the stepped walls does not coincide with the outer edge of the primary recirculation flow region near the sidewalls.

LAMINAR FORCED CONVECTION IN THREE-DIMENSIONAL DUCT FLOWS

1988 ◽  
Vol 13 (4) ◽  
pp. 451-466 ◽  
Author(s):  
C. Nonino ◽  
S. Del Giudice ◽  
G. Comini
Keyword(s):  
Forced Convection ◽  
Three Dimensional ◽  
Laminar Forced Convection

Squeeze Film Damper Suppression of Thermal Bow-Morton Effect Instability

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Dongil Shin ◽  
Alan B. Palazzolo ◽  
Xiaomeng Tong
Keyword(s):  
Three Dimensional ◽  
Squeeze Film ◽  
Viscous Heating ◽  
Fluid Inertia ◽  
Euler Beam ◽  
Nonlinear Simulation ◽  
Squeeze Film Damper ◽  
Morton Effect ◽  
Tilting Pad Journal Bearing ◽  
Rotor Model

Abstract The Morton effect (ME) is a synchronous vibration problem in turbomachinery caused by the nonuniform viscous heating around the journal circumference, and its resultant thermal bow (TB) and ensuing synchronous vibration. This paper treats the unconventional application of the SFD for the mitigation of ME-induced vibration. Installing a properly designed squeeze film damper (SFD) may change the rotor's critical speed location, damping, and deflection shape, and thereby suppress the vibration caused by the ME. The effectiveness of the SFD on suppressing the ME is tested via linear and nonlinear simulation studies employing a three-dimensional (3D) thermohydrodynamic (THD) tilting pad journal bearing (TJPB), and a flexible, Euler beam rotor model. The example rotor model is for a compressor that experimentally exhibited an unacceptable vibration level along with significant journal differential heating near 8000 rpm. The SFD model includes fluid inertia and is installed on the nondrive end bearing location where the asymmetric viscous heating of the journal is highest. The influence of SFD cage stiffness is evaluated.

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