mode wise thermal conductivity of bismuth telluride

... predict lattice thermal conductivity [7,8], nodetailed theoretical work has been performed to reveal mode- wise phonon relaxation times and mode- wise thermal conductivity in bismuth telluride. In ... xxu@ecn.purdue.eduSchool of Mechanical Engineeringand Birck Nanotechnology Center,Purdue University,West Lafayette, IN 47907 Mode- Wise Thermal Conductivity of Bismuth Telluride Thermal properties ... 80% of thetotal lattice thermal conductivity. Figure 6(b) shows the contribu-tions to lattice thermal conductivity of different phonon wave-lengths, indicating that about 80% of the thermal conductivity...

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thermal conductivity of bismuth telluride nanowire array epoxy composite

... ﬁgure of merit, ZT=␴·S2T/␬, where␴is the electrical conductivity in units of ͑⍀−1m−1͒, S is the Seebeck coefﬁcient in units of ͑V/K͒, and␬is the thermal conductivity in units of ͑W/m ... Center, School of Materials Engineering, Purdue University,xxu@purdue.eduThis paper is posted at Purdue e-Pubs.http://docs.lib.purdue.edu/nanopub/393 Thermal conductivity of bismuth telluride nanowire ... nanowire volumefraction should be maximized and the thermal conductivity of the matrix should be minimized.If the lattice thermal conductivity of the nanowire can bereduced to values that are...

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thermal conductivity of bismuth telluride nanowire array epoxy composite

... ﬁgure of merit, ZT=␴·S2T/␬, where␴is the electrical conductivity in units of ͑⍀−1m−1͒, S is the Seebeck coefﬁcient in units of ͑V/K͒, and␬is the thermal conductivity in units of ͑W/m ... Center, School of Materials Engineering, Purdue University,xxu@purdue.eduThis paper is posted at Purdue e-Pubs.http://docs.lib.purdue.edu/nanopub/393 Thermal conductivity of bismuth telluride nanowire ... nanowire volumefraction should be maximized and the thermal conductivity of the matrix should be minimized.If the lattice thermal conductivity of the nanowire can bereduced to values that are...

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thermomechanical and thermal contact characteristics of bismuth telluride films electrodeposited on carbon nanotube arrays

... However, solidsolutions of Bi2Te3or other classes of TE materials with reduced thermal conductivity might still beneﬁt from this strategy. Forexample, the thermal conductivity of a typical (Bi0.7Sb1.3)(Se2.91Te0.09) ... interfaceresistance was about 3% of the TE ﬁlm thermal resistance(0.23 K WÀ1, corresponding to a measured thermal conductivity of 1.5 W (m K)À1at 350 K). The higher thermal resistance at theTE/CNT/M/Si ... thermal interface resistances of CNT-TEsamples is $55% of the intrinsic resistance of the TE ﬁlm itself(0.55 K WÀ1, corresponding to a measured thermal conductivity of 1.8 W (m K)À1at 350 K)....

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measurement of in plane thermal conductivity of ultrathin films using micro raman spectroscopy

... scattering for reducing the in-plane thermal conductivity of Bi ﬁlms. The measured in-plane thermal conductivity value of the ∼20-nm ﬁlms, 11 W/mK, is close to those of the thickest Bi ﬁlms measured ... thein-plane thermal conductivity of Bi ﬁlms.Downloaded by [Purdue University] at 09:34 21 April 2014 IN-PLANE THERMAL CONDUCTIVITY 1910123456780 5 10 15 20 25 30 35In-plane Thermal Conductivity ... minimum thermal conductivity models for dielectrics.Our work demonstrates that the micro-Raman method is promising for characterization of in-plane thermal conductivity and phonon behaviors of thin-ﬁlm...

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thermal conductivity of nanoparticle fluid mixture

... consideredaEffective thermal conductivity of the mixtureke, thermal conductivity of the  uidkf, ratio of thermal conductivity of particle to thermal conductivity o f  uid ®, and volumefraction of particles ... shows theratios of the thermal conductivity o f the mixtureketo the thermal conductivityof the correspondingbase  uidkf. For all of the  uids,the thermal conductivity of the mixture increases ... AND CHOIFig. 2a Thermal conductivityasa functionofvolumefraction of Al2O3powders in different  uids.Fig. 2b Thermal conductivity ratio as a function of volume fraction of Al2O3powders...

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thermal conductivity of nanoparticle fluid mixture

... consideredaEffective thermal conductivity of the mixtureke, thermal conductivity of the  uidkf, ratio of thermal conductivity of particle to thermal conductivity o f  uid ®, and volumefraction of particles ... shows theratios of the thermal conductivity o f the mixtureketo the thermal conductivityof the correspondingbase  uidkf. For all of the  uids,the thermal conductivity of the mixture increases ... AND CHOIFig. 2a Thermal conductivityasa functionofvolumefraction of Al2O3powders in different  uids.Fig. 2b Thermal conductivity ratio as a function of volume fraction of Al2O3powders...

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thermal conductivity of nanoparticle fluid mixture

... consideredaEffective thermal conductivity of the mixtureke, thermal conductivity of the  uidkf, ratio of thermal conductivity of particle to thermal conductivity o f  uid ®, and volumefraction of particles ... shows theratios of the thermal conductivity o f the mixtureketo the thermal conductivityof the correspondingbase  uidkf. For all of the  uids,the thermal conductivity of the mixture increases ... AND CHOIFig. 2a Thermal conductivityasa functionofvolumefraction of Al2O3powders in different  uids.Fig. 2b Thermal conductivity ratio as a function of volume fraction of Al2O3powders...

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advances in thermal design of heat exchangers a numerical approach direct-sizing, step-wise rating, and transients

... equationsbalance of masshot fluidbalance of linear momentumbalance of energysolid wall — balance of energybalance of energycold fluidbalance of linear momentumbalance of massFINITE-DIFFERENCE ... Smith is a Fellow of both the Institution of Mechanical Engineers and of theAmerican Society of Mechanical Engineers, and is also a Member of the Institute of Refrigeration. ... overmany years of discussion, encouragement was provided by Professor Alan Jeffrey of the Department of Engineering Mathematics at the University of Newcastleupon Tyne. Professor Aubrey...

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Thermal properties of the vernacular buildings envelopes: the case of the "Sassi di Matera" and "Trulli di Alberobello

... consisted of the measurement of thermal conductance of two different typologies of building wall: a wall in blocks of calcarenite sandstone assembled with mortar, typical of the constructions of "Sassi ... knowledge of the temperature coefficient of the material of which it is made. A single measure allows for the determination of diffusivity, thermal conductivity, and specific heat of the material ... black-box methods, the thermal conductance of the wall. With this particular type of construction of the monitored walls, it is not possible to use other methods of determination of thermal conductance...

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