HEAT TRANSFER AND HYSTERESIS PHENOMENA IN SINTERED, METAL, FIBROUS POROUS COVERINGS

2009 ◽  
Author(s):  
Tadeusz Michal Wojcik
Keyword(s):  
Heat Transfer ◽  
Sintered Metal ◽  
Hysteresis Phenomena

Heat Transfer and Fluid Flow in Sintered Metallic Fiber Structures

2010 ◽  
Vol 638-642 ◽  
pp. 1884-1889 ◽  
Author(s):  
Olaf Andersen ◽  
Jens Meinert
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Storage ◽  
Short Fiber ◽  
Analytical Models ◽  
Flow Properties ◽  
Metal Fiber ◽  
Open Cell ◽  
Sintered Metal ◽  
Inner Surface

Sintered metal fiber structures show a favourable ratio between pressure drop and inner surface area. Their exclusively open-cell morphology makes them well suited for heat transfer or temporary heat storage applications. Recently, highly conductive sintered metal fiber structures were successfully prepared from melt extracted aluminum alloy fibers. The heat conduction and fluid flow properties of metallic sintered short fiber structures were determined experimentally and compared with simple analytical models. It was found that equations taken from the available literature yield good approximations to the experimental results.

Heat transfer between liquid3He and sintered metal heat exchangers

1984 ◽  
Vol 55 (1-2) ◽  
pp. 157-174 ◽  
Author(s):  
A. R. Rutherford ◽  
J. P. Harrison ◽  
M. J. Stott
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Sintered Metal

scholarly journals Characterisation of Flow and Heat Transfer in Sintered Metal Foams

2008 ◽  
Author(s):  
Jo¨rg Sauerhering ◽  
Stefanie Angel ◽  
Thomas Fend ◽  
Stefan Brendelberger ◽  
Elena Smirnova ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Combustion Chamber ◽  
Gas Turbines ◽  
Metal Foam ◽  
High Porosity ◽  
Transfer Coefficients ◽  
Sintered Metal ◽  
Flow And Heat Transfer ◽  
Wall Element

Since sintered metal foam is an innovative material with promising properties such as high porosity, good thermal conductivity, beneficial mechanical properties like strength and weldability, it has been considered to be applied as an open porous wall element in combustion chambers of gas turbines. In this application, the foam serves as a functional material capable to lead cooling air through micro- and minichannels into the inside of the combustion chamber. This cooling technique also known as effusion cooling keeps the combustion chamber walls below critical temperatures and therefore enables the burning process to be more effectively operated at higher temperatures. For a proper design of the wall element, the temperature distribution along the path of the fluid inside the foam must be known. For an exact calculation of the temperature flow and heat transfer processes inside the foam must be known. Therefore in this study the permeability and heat transfer properties of the foam have been characterized experimentally. The methods are described and the results in terms of permeability coefficients, convective heat transfer coefficients and effective thermal conductivity are presented as functions of the foam’s porosity. The method of the calculation is described and finally, the results of the calculation are presented, showing that due to the fine grained structure of the foam, the heat transfer from the solid to the cooling fluid takes place in a thin layer close to the inner surface of the camber wall.

Thermal Analysis on Finned Heat Sink with Thin Porous Layers

2015 ◽  
Vol 764-765 ◽  
pp. 393-397
Author(s):  
Tzer Ming Jeng ◽  
Sheng Chung Tzeng ◽  
Dong Jhen Lin
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Heat Sink ◽  
Convection Heat Transfer ◽  
Thin Layers ◽  
Control Group ◽  
Convection Heat ◽  
Sintered Metal ◽  
Free Convection Heat ◽  
Radial Plate

This work experimentally explored the free convection heat transfer characteristics of finned heat sink with sintered-metal-beads layers. It has been proven that the metallic porous media can enhance the forced convection heat transfer efficiently. This work sintered the metal beads to adhere onto the both side surfaces of each radial plate fin of the metallic heat sink, and investigated whether the sintered-metal-beads layers promote the free convection heat transfer or not. The 0.5~0.85mm-diameetr bronze beads were employed. They were sintered smooth with the radial plate fins of the copper heat sink by thin layers at high temperature. The experimental groups were the plate-shape sintered-metal-beads and strip-shape sintered-metal-beads heat sinks. The pure copper finned heat sink was set as the control group. The results demonstrated that the thermal resistances of the experimental groups were separately 20.7% and 11.6% higher than that of the control group at the smaller temperature difference between the heated surface and the ambient (△T≈30°C); while the thermal resistances of the experimental groups were separately 15.3% and 6.9% higher than that of the control group at △T≈60°C. In general, the present sintered-metal-beads layers cannot strengthen the free convection heat transfer.

Effect of Thermal Conductivity on Temperature Fluctuations in the Mixing T-Junctions Filled with Porous Metal Materials

2012 ◽  
Vol 511 ◽  
pp. 92-95 ◽  
Author(s):  
Yong Wei Wang ◽  
Tao Lu ◽  
Kui Sheng Wang
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Porous Metal ◽  
Temperature Fluctuations ◽  
Transfer Enhancement ◽  
Eddy Simulation ◽  
Sintered Metal ◽  
Large Eddy ◽  
Turbulence Mixing ◽  
Metal Materials

Turbulence mixing in T-junctions filled with porous metal materials is numerical investigated using Large-eddy simulation turbulence model. Three cases of porous metal materials, made of three sintered metal spheres with different thermal conductivities (387.6 W/m۟۬•K for copper, 202.4 W/m۟۬•K for aluminum and 16.3 W/m۟۬•K for steel), are predicted. Compared the results of three cases, a higher thermal conductivity can also contribute more greatly to heat transfer enhancement. In T-junctions filled with porous metal materials, thermal conductivity is weakened considerably by the turbulence mixing of hot and cold fluid. The temperature fluctuation are no obvious different.

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