tailieunhanh - Heat Transfer Handbook part 40

Heat Transfer Handbook part 40. 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. | NOMENCLATURE 381 N number of sides in a polygon dimensionless number of discrete sowces dimensionless number of microcontacis dimensionless N k n numerator function dimeniionleii counter dimeniionleii Hertz elaitic parameter dimeniionleii combination parameter dimeniionleii contact ipot deniity 1 m2 P perimeter m preiiure N m2 or Pa Pg rn P 1 m Q Qg q R Rg Rmac Rmic R Rg RC R r Sf s T Tg Tg AT AT T Ti T2 t reference gai preiiure N m2 or Pa mean contact area preiiure N m2 or Pa Prandtl number dimeniionleii heat tranifer rate W gap heat tranifer rate W heat flux W m2 thermal reiiitance K W thermal reiiitance of gap K W macroicopic thermal reiiitance of gap K W microicopic thermal reiiitance of gap K W radiation reiiitance K W combination of terms dm t n ninh s combination of terms dm t ii kjnk s combination of terms dm t ii kjnk s combination of terms dm t ii kjnk s radial coordinate m material yield or flow itreii N m2 iide dimeniion m temperature K gai molecule temperature K reference temperature K temperature drop or difference K joint temperature drop K area-averaged temperature K temperature K temperature K layer thickneii m thickneii of eaasflc aayer m time i t1 layer 1 thickneii m thickneii of isotropce paaee m t2 u layer 2 iubitrate thickneii m local gap thickneii dimeniionleii poiition dimeniionleii w x y total local diiplacement m 382 THERMAL SPREADING AND CONTACT RESISTANCES Wo Xc x Y Yc y approach of contacting bodies due to loading m coordinate of center of eccentric rectangular reaa m length coordinate m mean plane separation m coordinate of center oe ecfentric fecteggldar teea m distance m length coordinate m z length coordinate m Greek Letter Symbols a ratio of semimajor axess dimensionless thermal diffusivity m2 s thermal conductivity ratio dimensionless accommodation parameter or coefficient dimensionless ai 2 P accommodation coefficient dimensionless accommodation coefficient dimensionless combination of terms dimensîontess fluid property parameter

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