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首页> 外文期刊>International journal of engineering research and industrial applications >NANOFLUID: FUTURE WORKING FLUID FOR HEAT EXCHANGING DEVICES
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NANOFLUID: FUTURE WORKING FLUID FOR HEAT EXCHANGING DEVICES

机译：NANOFLUID：换热设备的未来工作流体

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摘要

Theoretical study of published research work related with thermophysical properties and heat transfer for Nanofluid has been presented in this paper. Nanofluid is a colloidal solution of base fluid and solid nanoparticles having size less than 100 nm. Due to Addition of nanoparticles in a base fluid, thermophysical properties of resulting fluid, such as thermal conductivity, specific heat, viscosity, density gets altered. The volume fraction of solid nanoparticles in a base fluid varies from 1 to 5%. Alteration in thermophysical properties decreases the Prandtl number of the fluid. Nanofluids having nanoparticle volume fraction less than 1% have been recommended as working fluid in heat exchanging devices. The PH of the nanofluid and laser irradiation of nanoparticle before dispersion also affects the thermal properties. The dielectric constant of nanoparticles and base fluid decides the combination of nanoparticle and base fluid. The literature indicates 10 to 75% increase in thermal conductivity of the nanofluid and 4% to 36% enhancement in heat transfer coefficient. Nanofluids can be used as a working fluid in heat exchanging devices due to enhanced thermal properties.
机译：本文对与纳米流体的热物理性质和传热相关的已发表研究工作进行了理论研究。纳米流体是基础流体和尺寸小于100 nm的固体纳米颗粒的胶体溶液。由于在基础流体中添加了纳米颗粒，因此生成的流体的热物理性质（如导热系数，比热，粘度，密度）发生了变化。固体纳米颗粒在基础流体中的体积分数为1％至5％。热物理性质的改变降低了流体的普朗特数。推荐将纳米颗粒体积分数小于1％的纳米流体用作热交换设备中的工作流体。分散之前，纳米流体的PH值和激光照射纳米颗粒也会影响热性能。纳米颗粒和基础流体的介电常数决定了纳米颗粒和基础流体的组合。文献表明，纳米流体的热导率增加了10％至75％，而热传递系数提高了4％至36％。由于增强的热性能，纳米流体可用作热交换装置中的工作流体。

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