Plastic contact conductance model

Plastic Contact Conductance Model of Greenwood and Williamson. Sridhar and Yovanovich [109] developed correlation equations for the contact conductance of conforming rough surfaces based on the Greenwood and Williamson [26] surface model using the plastic deformation model described above. The dimensionless contact conductance correlation is... 

The proposed elastoplastic contact conductance model moves smoothly between the elastic contact model of Mikic [66] and the plastic contact conductance model of Cooper, Mikic, and... 

M. R. Sridhar and M. M. Yovanovich, Review of Elastic and Plastic Contact Conductance Models Comparison with Experiment, J. Thermophysics and Heat Transfer (8/4) 633-640,1994. 

Thermal contact, gap, and joint conductance models developed by many researchers over the past five decades are reviewed and summarized in several articles [20,23,50,58,143,147,148] and in the recent text of Madhusudana [59]. The models are, in general, based on the assumption that the contacting surfaces are conforming (or flat) and that the surface asperities have particular height and asperity slope distributions [26, 116, 125]. The models assume either plastic or elastic deformation of the contacting asperities, and require the thermal spreading (constriction) resistance results presented above. 

Electronic marketplace/E-commerce In addition to the many databases available and person-to-person contacts, E-commerce in plastics has been conducted through suppliers web sites or the dot-commerce independent web sites that link material buyers with sellers in transactions or auction formats. During the year 2000 five plastic producers/suppliers and various elastomer producers/suppliers created a new and important business model of a joint-venture web site. It provides multiple companies to join forces to do business. This is a strategy some observers call competition and others regard as just another form of selling in. an electronic format. Regardless of how it is perceived, the model will help propel e-commerce into the mainstream of processor procurement due to the size and wealth of the companies involved. The plastic model example is the largest online business-to-business site todate. 

If the plastic bead covering the tip of the thermocouple described in Problem 1.4 is quite large, and since plastic usually sustains a very low value of thermal conductivity, then the simple lumped model solution becomes quite inaccurate. To improve the model, we need to account for thermal conductivity in the (assumed) spherical shape of the plastic bead, (a) Assuming the bead is a perfect sphere, contacted everywhere by external fluid of temperature 7), perform a shell balance on an element of volume 4irr Ar and show that... 

The solid contact for plastic ISE membranes, made by applying conducting polymer (CP) and supported by a comprehensive theoretical model, was introduced by Lewenstam group [4, 10]. The CP used was poly(pyrrole) doped deliberately with tetrafluoride anions [see Eq. (10.10) and adjacent comment]. Since then different conducting polymers were used by numerous authors, mainly conjugated p-doped poly(tiophene), poly (aniline) and poly (pyrrole), and their derivates were applied [11, 12]. 

Among the contributions to the connection resistance described above, the intrinsic resistance of an individual conductive particle can be estimated with respect to its deformation. Since the metal-coated conductive particles are deformed plastically during the bonding process of an ACA, the numerical model for the calculation of the connection resistance should consider the plastic deformation of the conductive particles. Yim and Paik (1998) derived the connection resistance of an ACA joint from Holm s electrical contact theory, and the derived model described the connection resistance of the ACA in terms of the sample geometry, particle size, applied pressure, and the intrinsic properties of the conductive particles. However, this... 

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