Heat Transfer Handbook part 28. The Heat Transfer Handbook provides succinct hard data, formulas, and specifications for the critical aspects of heat transfer, offering a reliable, hands-on resource for solving day-to-day issues across a variety of applications. | CHAPTER 4 Thermal Spreading and Contact Resistances Department of Mechanical Engineering University of Waterloo Waterloo Ontario Canaaa E. E. MAROTTA Thermal Technologies Group IBM Corporation Poughkeepsie New York Introduction Types of joints or interfaces Conforming rough solids Nonconforming smooth solids Nonconforming rough solids Single layer between two conforming rough solids Parameters influencing contact resistance or conductance Assumptions for resistance and conductance model development Definitions of spreadmg rudl constriction eslslances Spreading and constriction resistances in a half-space Spreading and constriction resistances in flux tubes and channels Spreading and constriction resistances in an isotropic half-space Introduction Circular area on a half-space Isothermal circular source Isoflux circular source Spreading resistance of an isothermal eliptic ad source afca on a liali -saaee Dimensionless spreading resistance of an n oherrmth eliiptical afca Approximations for dimensionless spreading resistance Flux distribution over an isothermal elliptical area Spreading resistance of rectangular source afcas Isoflux rectangular area Isothermal rectangular area Isoflux regular polygonal area Arbitrary singly connected area Circular annular area Isoflux circular annulus Isothermal circular annulus 261 262 THERMAL SPREADING AND CONTACT RESISTANCES Other doubly connected areas on a half-space Effect of contact conductance on spreading resistance Transient spreading resistance in an isotropic half-space Isoflux circular area Isoflux hyperellipse Isoflux regular polygons Spreading resistance within a compound disk with conductance Special cases of the compound cis k solution Half-space problems Semi-infinite flux tube problems Isotropic finite disk with
