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Investigation on Convective Heat Transfer and Flow Features of Nanofluids

Investigation on Convective Heat Transfer and Flow Features of Nanofluids,10.1115/1.1532008,Journal of Heat Transfer-transactions of The Asme,Yimin Xu

Investigation on Convective Heat Transfer and Flow Features of Nanofluids   (Citations: 234)
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With progresses of thermoscience and thermal engineering, many efforts have been devoted to heat transfer enhancement. Among them, application of additives to liquids is often involved. Since the flow media themselves may be the controlling factor of limiting heat transfer performance, solid additives are suspended in the base liquids in order to change transport properties, flow and heat transfer features of the liquids @1,2#. Besides describing chronological development in this field, Hetsroni and Rozenblit @3# investigated the thermal interaction between the particles- laden turbulent flow and a heated plate for a liquid-solid mixture consisting of water and polystyrene particles. Traditionally, solid particles of micrometer or millimeter magnitudes are mixed in the base liquid. Although the solid additives may improve heat trans- fer coefficient, practical application are limited because of the fact that the micrometer and/or millimeter-sized particles settle rap- idly, clog flow channels, erode pipelines and cause severe pressure drops. The concept of nanofluids refers to a new kind of heat transport fluids by suspending nanoscaled metallic or nonmetallic particles in base fluids. Energy transport of the nanofluid is af- fected by the properties and dimension of nanoparticles as well as the solid volume fraction. Some experimental investigations have revealed that the nanofluids have remarkably higher thermal con- ductivities than those of conventional pure fluids and shown that the nanofluids have great potential for heat transfer enhancement @ 4-7 #. Compared with the existing techniques for enhancing heat transfer by adding millimeter and/or micrometer-sized particles in fluids, nanofluids are expected to be ideally suited for practical application with incurring little or no penalty in pressure drop because the nanoparticles are so small that the nanofluid behaves like a pure fluid. To apply the nanofluid to practical heat transfer processes, more studies on its flow and heat transfer feature are needed. Pak and Cho @8# performed experiments on turbulent friction and heat transfer behaviors of two kinds of the nanofluids. In their study, g-Al2O3 and TiO2 were dispersed in water, and the experimental results showed that the Nusselt number of the dispersed fluids increases with increasing the volume fraction of the suspended solid particles and the Reynolds number. Lee and Choi @9# applied the nanofluid as the coolant to a microchannel heat exchanger for cooling crystal silicon mirrors used in high-intensity X-ray sources and pointed out that the nanofluid dramatically enhances cooling rates compared with the conventional water-cooled and liquid-nitrogen-cooled microchannel heat exchangers. It is expected that the main reasons of heat transfer enhance- ment of the nanofluids may be from intensification of turbulence or eddy, suppression or interruption of the boundary layer as well as dispersion or backmixing of the suspended nanoparticles, be- sides substantial augmentation of the thermal conductivity and the heat capacity of the fluid. Therefore, the convective heat transfer coefficient of the nanofluids is a function of properties, dimension and volume fraction of suspended nanoparticles as well as the flow velocity. The conventional convective heat transfer correla- tion of the pure fluid isn't applicable to the nanofluid. To under- stand the mechanism of heat transfer enhancement of nanofluids and to accelerate practical applications of the nanofluids, more investigations are needed on fundamental features of convective heat transfer and flow performance of the nanofluids. Based on one of the previous papers @10#, this paper is aimed at studying the single-phase flow and heat transfer performance of the nanofluid in tubes for the turbulent flow and developing heat transfer corre- lation for the experimental data.
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    • ...There are relatively few studies involved in describing fluid flow and convective heat transfer performance of the nanofluids [7, 8]...

    M. Ghazviniet al. Heat Transfer Properties of Nanodiamond–Engine Oil Nanofluid in Lamina...

    • ...The effective volumetric specific heat of nanofluids can be determined from [1, 21] where φ p is the particle volume fraction and subscripts nf, p, and f stand for nanofluids, nanoparticle, and base fluid, respectively...

    S. M. SOHEL MURSHED. Simultaneous Measurement of Thermal Conductivity, Thermal Diffusivity,...

    • ...The works of Pak and Cho [19] and Xuan and Li [20] represent two outstanding contributions to the experimental study of turbulent convection of nanofluids...
    • ...A comparison with the experimental correlations proposed by Pak and Cho [19] and Xuan and Li [20] and the numerical correlation proposed by Maiga et al. [22] is accomplished...
    • ...The correlation proposed by Maiga et al. [22] over-estimates the values provided by Pak and Cho [19] by about 20%, while Xuan and Li [20] correlation under-estimates them by about 15%...
    • ...For Re <3 0 ×1 0 3 , Xuan and Li [20] data are in agree-...
    • ...the contrary, is in agreement with Maiga et al. [22] and Xuan and Li [20] and Re =5×1 0 3 ,w hich is greater than all the correlations values...
    • ...Moreover, it is important to remark that Pak and Cho [19] developed their correlation working with Al2O3 nanofluid, as in the present article, whereas Xuan and Li [20] worked with Cu nanofluid, even though their correlation should be valid in general [20,33]...
    • ...Moreover, it is important to remark that Pak and Cho [19] developed their correlation working with Al2O3 nanofluid, as in the present article, whereas Xuan and Li [20] worked with Cu nanofluid, even though their correlation should be valid in general [20,33]...

    Vincenzo Biancoet al. Enhancement of heat transfer and entropy generation analysis of nanofl...

    • ...This means that the slip velocity between the fluid and particle may not be zero [22]...

    Shahriar Allahyariet al. Conjugate heat transfer of laminar mixed convection of a nanofluid thr...

    • ...For example, a number of research groups presented surprising experimental findings that nanofluids significantly enhance thermal conductivities [1-8], convective heat transfer coefficient [9-13], and heat absorption rate [14]...

    Wook-Hyun Leeet al. Round-robin test on thermal conductivity measurement of ZnO nanofluids...

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