Inverse estimation of temperature boundary conditions with irregular shape of gas tank

2010 ◽  
Vol 53 (21-22) ◽  
pp. 4651-4662 ◽  
Author(s):  
David T.W. Lin ◽  
Chi-Chang Wang ◽  
Ching-Yu Yang ◽  
Jen-Chieh Li
Keyword(s):  
Boundary Conditions ◽  
Irregular Shape ◽  
Temperature Boundary ◽  
Inverse Estimation

Sidewall finite-conductivity effects in confined turbulent thermal convection

2002 ◽  
Vol 473 ◽  
pp. 201-210 ◽  
Author(s):  
ROBERTO VERZICCO
Keyword(s):  
Boundary Conditions ◽  
Thermal Convection ◽  
Lateral Wall ◽  
Finite Conductivity ◽  
Mean Flow ◽  
Number Range ◽  
Additional Heat ◽  
Low Aspect Ratio ◽  
Temperature Boundary ◽  
The Mean

The effects of a sidewall with finite thermal conductivity on confined turbulent thermal convection has been investigated using direct numerical simulation. The study is motivated by the observation that the heat flowing through the lateral wall is not always negligible in the low-aspect-ratio cells of several recent experiments. The extra heat flux modifies the temperature boundary conditions of the flow and therefore the convective heat transfer. It has been found that, for usual sidewall thicknesses, the heat travelling from the hot to the cold plates directly through the sidewall is negligible owing to the additional heat exchanged at the lateral fluid/wall interface. In contrast, the modified temperature boundary conditions alter the mean flow yielding significant Nusselt number corrections which, in the low Rayleigh number range, can change the exponent of the Nu vs. Ra power law by 10%.

Inverse estimation of the unknown heat flux boundary with irregular shape fins

2011 ◽  
Vol 54 (25-26) ◽  
pp. 5275-5285 ◽  
Author(s):  
David T.W. Lin ◽  
Ching-yu Yang ◽  
Jen-Chieh Li ◽  
Chi-Chang Wang
Keyword(s):  
Heat Flux ◽  
Irregular Shape ◽  
Inverse Estimation

Effects of Temperature Boundary Conditions on SMA Actuator Performance Using a Fully Coupled Thermomechanical Model

2011 ◽  
Author(s):  
Nicole Lewis ◽  
Stefan Seelecke
Keyword(s):  
Boundary Conditions ◽  
Temperature Phase ◽  
Thermomechanical Model ◽  
Finite Element Program ◽  
Temperature Boundary ◽  
Element Program ◽  
Sma Actuator ◽  
Effects Of Temperature ◽  
The Wire ◽  
Stiff Spring

The effects of temperature boundary conditions and the resulting performance of an SMA actuator were studied for an SMA wire coupled with a stiff spring. The wire was actuated via joule heating under both adiabatic and isothermal boundary conditions. The resulting temperature, phase fraction, strain and stress profiles along the wire were studied together with the wire tip displacement. The simulations were conducted using the finite element program ABAQUS, and a fully thermo-mechanically coupled shape memory alloy (SMA) actuator model was used to simulate the behavior. ABAQUS’s user material (UMAT) feature was utilized to model the SMA wire using a mesoscopic free energy model [1] in order to accurately describe the thermomechanically coupled actuator behavior. The results from the simulations highlighted the differences between homogeneous and inhomogeneous profiles, and a 34% difference in actuation stroke between the two cases was observed.

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