survey of the thermal conductance of metallic contacts

  • 37 Pages
  • 4.47 MB
  • 4482 Downloads
  • English
by
H.M.S.O. , London
Metals -- Thermal properties., Heat -- Conduc
Statementby H. Y. Wong.
Series[Great Britain] Aeronautical Research Council. Current papers,, no. 973, Current papers (Aeronautical Research Council (Great Britain)) ;, no. 973.
Classifications
LC ClassificationsTL507 .G77 no. 973
The Physical Object
Pagination[1], 37 p.
ID Numbers
Open LibraryOL4616337M
LC Control Number77385772

THERMAL CONTACT RESISTANCE - Thermopedia. A Swvey of the Thermal Conductance of Metallic Contacts.

Details survey of the thermal conductance of metallic contacts EPUB

Wong. LONDON: HER MAJESTY’S STATIONERY OFFICE Price 7s. net. C.P. * July, A Survey of the Thermal Conductance of Metallic Contacts -By- H. The thermal conductance of pressed contacts which have been augmented with Indium foil or Apiezon-N (tm) grease was measured over the temperature range of to K, with applied Author: National Aeronautics and Space Administration NASA.

Experimental investigations on thermal contact conductances of metallic contacts have been reported here. The studies are restricted to relatively low contact pressure: hardness ratios (Cited by: estimating thermal conductance on metallic contact surfaces by considering the surface roughness and the thermal conductance of surface materials such as oxidized layers.

With this method, we first calculate real contact area from Hertz's JSME Data Book. Thermal contact conductance (TCC) measurements are made on bare and gold plated (⩽ μm) oxygen free high conductivity (OFHC) Cu and brass contacts in vacuum, nitrogen, and argon. A precise estimation of thermal contact conductance for the interface of sets of similar materials has been carried out employing a steady-state approach.

Results have been compared with the theoretical models based on plastic and elastic deformation based theories for nominally flat metallic contacts. Figure 10 presents theoretical and experimental depend- ence of thermal resistance on temperature.

P, kg/cm Fia. 7, Thermal contact resistance for St. 45 (according to experimental data [8]; air medium). 1 is the 5th class of finish; 2 is the 6th class of finish; 4 is the 8th class of finish.

THERMAL RESISTANCE OF METALLIC CONTACTS. This book covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, survey of the thermal conductance of metallic contacts book well as the role.

A mathematical analysis of a thermal contact is first carried out on an idealized shape of contact point. The thermal conductance is expressed in terms of the thermal conductivities of the metals and of the fluid filling the voids, the real area in contact, the number of contact.

The thermal conductance is expressed in terms of the thermal conductivities of the metals and of the fluid filling the voids, the real area in contact, the number of contact points per unit area. This option allows users to search by Publication, Volume and Page Selecting this option will search the current publication in context.

Selecting this option will search all publications across. The thermal conductance and electrical conductance of gold atomic contacts have been recently proven to be quantized at room temperature. However, a big experimental challenge in such measurements is represented by the fast breaking dynamics of metallic junctions at room temperature, which can exceed the typical response time of the thermal.

This book covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent).Reviews: 1.

Estimation of thermal conductance on metallic contact interface in vacuum T. Hattori', M. Nakamura' & Y. Saitoh ^Mech. Eng. Res. Lab., Hitachi Ltd., Japan ^Nuclear System Division, Hitachi Ltd., Japan Abstract Space apparatus subject heavy thermal. The thermal contact conductance is a consequence of contact being made only at discrete locations, rather than over the entire area.

Ideally, the contact area is the interface area of surfaces. However, even in very smooth surfaces, irregularities exist which may restrict the contact. The thermal contact conductance of each set of materials presented in the form of specific correlations for different roughness parameters is one of the most important outcomes of the present.

“A Correlation for Thermal Contact Conductance of Nominally Flat Surfaces in Vacuum”, Proceedings of 7th Thermal Conductivity Conference, U.S. Bureau of Standards, pp. –, Google Scholar. The accurate estimation of thermal contact conductance is necessary for the development of a conduction-cooled superconducting magnet system because the metallic materials are.

The thermal contact conductance (TCC) of metallic interfaces was computed. • Surface reconstruction and scale-resolved direct numerical simulation was conducted. • Predicted results slightly. Page - Standard Method of Test for Thermal Conductivity of Materials by Means of the Guarded Hot Plate (adopted July by ASHVE, ASTM Designation C ).

Appears in books from 5/5(1). If the metallic contact points ("a-spots") are assumed to be all circles with the same radius and to lie at distances from each other, which are large compared to their radii, the constriction conductance ~a is given by the formula: 0 = 2n~2,m (2) n represents the number of conducting spots per cm2, d is their average radius and 2m.

Thermal Contact Resistance Modeling of Non-Flat, Roughened Surfaces With Non-Metallic Coatings 10 July | Journal of Heat Transfer, Vol.No. 1 Vol Number 3 July. Joint thermal conductance testing has been undertaken for bolted copper to copper connections from 60 mK to 26 K.

This testing was performed to validate an initial design basis for the SuperCDMS. Books. Publishing Support. Login. Wong H Y A Survey of Thermal Conductance of Metallic Contacts (London: Her Majesty's Stationery Office) Peterson G P and Fletcher L S Thermal contact conductance of metallic.

Download survey of the thermal conductance of metallic contacts PDF

A unique experimental set-up was fabricated to carry out axial heat flow steady state experiments for the assessment of thermal contact conductance (TCC) at the interface of two materials.

Three different materials (copper, brass and stainless steel) were selected for the experiments considering their mechanical and thermal. Ott, Roland E., "Thermal and Electrical Resistance of Metal Contacts" (). Dissertations and Theses. Paper /etd This Thesis is brought to you for free and open access.

It has been accepted for inclusion in Dissertations and Theses by an authorized administrator of PDXScholar. For more information, please contact. Thermal conductance of augmented pressed metallic contacts at liquid helium temperatures Cryogenics, Vol.

33, No. 12 Thermal conductance of Cu/Cu and Cu/Si interfaces from 85 K to K. An integrated experimental and numerical investigation of the thermal contact resistance across two nominally flat, coated metallic engineering surfaces in contact is presented. The model consists of a surface deformation computation, which determines the actual contact.

Precise evaluation of thermal contact conductance (TCC) is essential for the thermal and mechanical analysis of a thermal system found in different engineering applications.

Description survey of the thermal conductance of metallic contacts EPUB

Inverse heat conduction method provides an effective tool for the estimation of thermal contact conductance at the interface of two bodies in contact. An experimental investigation of thermal contact conductance of Hastelloy C based on steady-state heat flux method International Communications in Heat and Mass Transfer, Vol.

41 Investigation on Numerical Calculation of Thermal. Thermal contact conductance of stainless steel-GFRP interface under vacuum environment Experimental Thermal and Fluid Science, Vol. 42 Evaluation of thermal conductive resistance at organic-inorganic interface and development of thermal .Imperfect contact of solid surfaces due to roughness and presence of surface layers, having properties different from the bulk materials, is the main reason for thermal contact resistance that appears .