TAILIEUCHUNG - Kihm et al. Nanoscale Research Letters 2011, 6:361

Kihm et al. Nanoscale Research Letters 2011, 6:361 NANO EXPRESS Open Access A new heat propagation velocity prevails over Brownian particle velocities in determining the thermal conductivities of nanofluids Kenneth D Kihm1,3*, Chan Hee Chon2, Joon Sik Lee3 and Stephen US Choi4 Abstract An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids. The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities. In contrast, the present model proposes a faster heat transfer velocity at the same order as the speed of sound, rooted in. | Kihm et al. Nanoscale Research Letters 2011 6 361 http content 6 1 361 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access A new heat propagation velocity prevails over Brownian particle velocities in determining the thermal conductivities of nanofluids Kenneth D Kihm1 3 Chan Hee Chon2 Joon Sik Lee3 and Stephen US Choi4 Abstract An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids. The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities. In contrast the present model proposes a faster heat transfer velocity at the same order as the speed of sound rooted in a modified kinetic principle. In addition this model accounts for both nanoparticle heat dissipation as well as coagulation effects. This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data. Findings on nanofluid thermal conductivity A nanofluid 1 is defined as a mixture of nanosized particles suspended in liquid as the base fluid. The nanofluid is perceived as an extended scope of earlier efforts to study the effective thermal conductivity of multiphase systems containing microscale particle-embedded solid materials 2-4 and a solid dispersion in liquid 5 . Since the first article on measurements of the enhanced thermal conductivity of nanofluids suspension of Al2O3 and CuO nanoparticles in either water or ethylene glycol using the transient hot-wire technique was published in 1999 6 a number of successive measurement studies have supplemented the original findings and extended the parametric variations affecting the level of conductivity enhancement 7-23 . These experimental examinations have revealed the parametric importance of thermal conductivity enhancement including the volume concentration of .

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