Heat transfer device for the transport of large conduction flux

Details Heat transfer device for the transport of large conduction flux Heat transfer device for the transport of large conduction flux

1984-10-23

1986-05-27

Davis, Jr., Albert W.

Heat exchange

Intermediate fluent heat exchange material receiving and...

Liquid fluent heat exchange material

165 10, 16510434, F28D 1500

Patent

active

045909938

ABSTRACT:
A device for the transport of large conduction heat flux between two locations of differing temperature includes a pair of fluid reservoirs for positioning at the respective locations connected by at least one duct, and preferably a plurality of ducts, having walls of a material which conducts heat. A heat transfer fluid, preferably a liquid, and preferably a liquid metal such as mercury, lithium or sodium, fills both reservoirs and the connecting ducts. An oscillatory axial movement or flow of working fluid is established within the ducts, with the extent of fluid movement being less than the duct length. Preferably the oscillatory movement is sinusoidal. Heat is transferred radially between the fluid and the duct walls and thence axially along the ducts. The rate of heat transfer is greatly enhanced by a physical mechanism which may be described as a high time-dependent radial temperature gradient produced by fluid oscillations. During most of each sinusoidal cycle, fluid in the wall-near region has a temperature different from the core of the fluid column, with most of the temperature difference concentrated across a relatively thin boundary layer.

REFERENCES:
patent: 2787444 (1957-04-01), Sbarstrom
patent: 4098324 (1978-07-01), Kummel et al.
patent: 4135371 (1979-01-01), Kesselring et al.
U. K. Kurzweg, "Enhanced Heat Conduction in Fluids Subjected to Sinusoidal Oscillations", submitted for publication to Journal of Heat Transfer (ASME).
U. K. Kurzweg and Ling-de Zhao, "Heat Transfer by High Frequency Oscillations", A New Hydrodynamic Technique for Achieving Large Effective Thermal Conductivities", submitted for publication to Physics of Fluids.

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