Heat transfer characteristics of nanofluids: a review

Wang, Xiangqi; Mujumdar, Arun S.

doi:10.1016/j.ijthermalsci.2006.06.010

Cited by 1,930 publications

(772 citation statements)

References 100 publications

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“…In one-step method, the material is prepared through simultaneously producing and dispersing nanometer-sized materials into the PCM base fluid [30,31], while in the two-step method, nanometer-sized materials are first produced and then dispersed into the PCM base fluid [31,32]. The two-step method is the most economic method to produce the materials in large scale and has been extensively used to prepare nano-enhanced PCMs [31,[33][34][35][36].…”

Section: Materials Preparationmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

158

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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Section: Materials Preparationmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

158

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“…The above graphs show that the effective thermal conductivity ratio increases with an increase in the volume fraction of the nano-dispersants in the base fluid. The results from this model have been compared with other theoretical models like Yu and Choi [14], Maxwell model [12] and Prasher model [19], [20].…”

Section: Graphs and Discissionmentioning

confidence: 99%

The Interfacial Layer Effect on Thermal Conductivity of Nano-Colloidal Dispersions

Pasrija¹,

Srivastava²

2014

IJAPM

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Abstract-A mathematical model has been proposed for calculating the effective Thermal Conductivity of nano colloidal dispersions by incorporating a thermal conductivity profile for the interfacial layer. The present model has been successfully applied to the colloidal dispersions containing rod shaped nanoparticles as well as those containing spherical nanoparticles. The results have also been compared with other existing models.Index Terms-Thermal conductivity, nanofluids, colloidal dispersion and interfacial layer.

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“…Let V and U denote the velocity components in the cross stream and down stream directions, respectively. The governing equations of motion, energy and nano particle for curved channel are described as (Wang and Mujumdar 2007;Polidori et al 2007)…”

Section: Mathematical Formulationmentioning

confidence: 99%

The mathematical analysis for peristaltic flow of nano fluid in a curved channel with compliant walls

Nadeem

Maraj

2012

Appl Nanosci

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In the present paper, we have investigated the peristaltic flow of nano fluid in a curved channel with compliant walls. The governing equations of nano fluid model for curved channel are derived including the effects of curvature. The highly nonlinear partial differential equations are simplified using the long wave length and low Reynolds number assumptions. The reduced nonlinear partial differential equation is solved analytically with the help of homotopy perturbation method. The physical features of pertinent parameters have been discussed by plotting the graphs of pressure rise, velocity, temperature, nano particle volume fraction and stream functions.

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Heat transfer characteristics of nanofluids: a review

Cited by 1,930 publications

References 100 publications

Nano-enhanced phase change materials for improved building performance

Nano-enhanced phase change materials for improved building performance

The Interfacial Layer Effect on Thermal Conductivity of Nano-Colloidal Dispersions

The mathematical analysis for peristaltic flow of nano fluid in a curved channel with compliant walls

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