scholarly journals Characterization of Heat Transfer Coefficient of Lightweight Alloys in Kirksite Dies

2019 ◽  
Vol 651 ◽  
pp. 012024
Author(s):  
Kaab Omer ◽  
Clifford Butcher ◽  
Michael Worswick
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Lightweight Alloys

scholarly journals Characterization of Residual Stresses in 718 Turbine Discs by Neutron Diffraction and Finite Element Modelling

2011 ◽  
Vol 278 ◽  
pp. 102-107 ◽  
Author(s):  
Peter Staron ◽  
Ulrike Cihak ◽  
Helmut Clemens ◽  
Martin Stockinger ◽  
Andreas Schreyer
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Heat Transfer Coefficient ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Transfer Coefficient ◽  
Thin Plate ◽  
Stress Distributions ◽  
Element Simulation

The results of our investigations on residual stresses in commercially produced forged IN 718 compressor discs are reviewed. The residual stresses in the discs with a diameter of 320 mm and a thickness of up to 25 mm were studied using neutron diffraction to verify the predictions of a finite element simulation, which was used to model forging and cooling of the discs. In addition to the disc, a thin plate of the same material was also studied for testing the influence of specimen geometry on the model predictions. While the model results for the disc were not strongly influenced by the heat transfer coefficient, the stress distributions in the thin plate could only be predicted satisfactorily by using a temperature-dependent heat transfer coefficient that was derived from temperature measurements during quenching. Eventually, this led to an improvement of the FE simulation used for optimizing the production process.

scholarly journals Development and Characterization of a Loop Heat Pipe With a Planar Evaporator and Condenser

2011 ◽  
Author(s):  
H. Arthur Kariya ◽  
Daniel F. Hanks ◽  
Teresa B. Peters ◽  
John G. Brisson ◽  
Evelyn N. Wang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Heat Pipe ◽  
Convective Heat Transfer ◽  
Thermal Gradient ◽  
Convective Heat Transfer Coefficient ◽  
Planar Geometry ◽  
Loop Heat Pipe

We present the development and characterization of an air-cooled loop heat pipe with a planar evaporator and condenser. The condenser is mounted vertically above the evaporator, and impellers are integrated both sides of the condenser with tight clearance. The planar geometry allows for effective convective cooling by increasing the surface area and the convective heat transfer coefficient. To ensure condensation across the area of the condenser, a wicking structure is integrated in the condenser. The evaporator incorporates a multi-layer wicking structure to maintain a thermal gradient between the vapor and liquid regions, which is used to sustain the vapor and liquid pressures necessary for operation. The loop heat pipe was demonstrated to remove 140 W of heat at a temperature difference between the evaporator base and inlet air of 50 °C. This work is the first step towards the development of an air-cooled, multiple-condenser loop heat pipe.

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