The Influence of Rotating Element on Flow and Heat Transfer in the Two-Dimensional Confined Channel

2021 ◽  
pp. 333-341
Author(s):  
J. Ramarajan ◽  
D. Sathish Kumar ◽  
Ratnanjali Tiwari ◽  
S. Jayavel
Keyword(s):  
Heat Transfer ◽  
Two Dimensional ◽  
Flow And Heat Transfer ◽  
Confined Channel

A numerical model on transient, two-dimensional flow and heat transfer in He II

Cryogenics ◽  
1997 ◽  
Vol 37 (1) ◽  
pp. 1-9 ◽  
Author(s):  
T. Kitamura ◽  
K. Shiramizu ◽  
N. Fujimoto ◽  
Y.F. Rao ◽  
K. Fukuda
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Flow And Heat Transfer ◽  
Two Dimensional Flow

Three-Dimensional Modelling of Heat Transfer in Micro-Channels With Synthetic Jet

2010 ◽  
Author(s):  
Ann Lee ◽  
Victoria Timchenko ◽  
Guan H. Yeoh ◽  
John A. Reizes
Keyword(s):  
Heat Transfer ◽  
Silicon Substrate ◽  
Three Dimensional ◽  
Synthetic Jet ◽  
Numerical Results ◽  
Maximum Temperature ◽  
Complex Conjugate ◽  
Two Dimensional ◽  
Flow And Heat Transfer ◽  
Micro Channels

An in-house computer code is developed and applied to investigate the effect of a synthetic jet on heat transfer rates in forced convection of water in silicon micro-channels etched in the rear side of the silicon substrate. To account for the deflection of the membrane located at the bottom of the actuator cavity, a moving mesh technique to solve the flow and heat transfer is purposefully adopted. The governing equations are transformed into the curvilinear coordinate system in which the grid velocities evaluated are then fed into the computation of the flow in the cavity domain thus allowing the conservation equations of mass, momentum and energy to be solved within the stationary computational domain. The fully three-dimensional model considers the SIMPLE method to link the pressure and velocity. A heat flux of 1 MW/m2 is applied at the surface of the top of the silicon wafer and the resulting complex, conjugate heat transfer through the silicon substrate is included. The hydrodynamics feature of the flow is validated against existing experimental results and verified against numerical results from commercial package ANSYS CFX 11.0. Good agreement has been achieved. To track the development of the flow and heat transfer when the actuator is switched on, numerical results of 20 full cycles of the actuator are simulated. When the actuator is switched on, noticeable temperature drop is observed at all points in the substrate from those which existed when there has been a steady water flow in the channel. At the end of 20th cycle of actuation, the maximum temperature in the wafer has reduced by 5.4 K in comparison with the steady flow values. In comparison with the two-dimensional study which account for 17K reduction, it indicates that synthetic jet has only smaller beneficial cooling and has been over-estimated in the previous two-dimensional study.

scholarly journals Effect of Squealer Tip on Rotor Heat Transfer and Efficiency

1997 ◽  
Author(s):  
A. A. Ameri ◽  
E. Steinthorsson ◽  
David L. Rigby
Keyword(s):  
Heat Transfer ◽  
Transfer Rate ◽  
Flow Structures ◽  
Two Dimensional ◽  
Transfer Enhancement ◽  
Flow And Heat Transfer ◽  
Significant Difference ◽  
Blade Tip ◽  
Large Heat ◽  
Good Agreement

Calculations were performed to simulate the tip flow and heat transfer on the GE-E3 first stage turbine, which represents a modern gas turbine blade geometry. Cases considered were a smooth tip, 2% recess, and 3% recess. In addition a two-dimensional cavity problem was calculated. Good agreement with experimental results was obtained for the cavity calculations, demonstrating that the k-ω turbulence model used is capable of representing flows of the present type. In the rotor calculations, two dominant flow structures were shown to exist within the recess. Also areas of large heat transfer rate were identified on the blade tip and the mechanisms of heat transfer enhancement were discussed. No significant difference in adiabatic efficiency was observed for the three tip treatments investigated.

scholarly journals Characteristics of fluid flow and heat transfer of two-dimensional offset jet

2015 ◽  
Vol 81 (825) ◽  
pp. 15-00066-15-00066 ◽  
Author(s):  
Yohei OGAWA ◽  
Atsushi TAMURA ◽  
Masatoshi SANO
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Two Dimensional ◽  
Flow And Heat Transfer ◽  
Offset Jet
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