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Anomalous heat transfer modes of nanofluids: a review based on statistical analysis.

Sergis A, Hardalupas Y - Nanoscale Res Lett (2011)

Bottom Line: The application of nanofluids as coolants is a novel practise with no established physical foundations explaining the observed anomalous heat transfer.The most popular proposed mechanisms in the literature to explain heat transfer in nanofluids are revealed, as well as possible trends between nanofluid properties and thermal performance.The review also suggests future experimentation to provide more conclusive answers to the control mechanisms and influential parameters of heat transfer in nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK. a.sergis09@imperial.ac.uk.

ABSTRACT
This paper contains the results of a concise statistical review analysis of a large amount of publications regarding the anomalous heat transfer modes of nanofluids. The application of nanofluids as coolants is a novel practise with no established physical foundations explaining the observed anomalous heat transfer. As a consequence, traditional methods of performing a literature review may not be adequate in presenting objectively the results representing the bulk of the available literature. The current literature review analysis aims to resolve the problems faced by researchers in the past by employing an unbiased statistical analysis to present and reveal the current trends and general belief of the scientific community regarding the anomalous heat transfer modes of nanofluids. The thermal performance analysis indicated that statistically there exists a variable enhancement for conduction, convection/mixed heat transfer, pool boiling heat transfer and critical heat flux modes. The most popular proposed mechanisms in the literature to explain heat transfer in nanofluids are revealed, as well as possible trends between nanofluid properties and thermal performance. The review also suggests future experimentation to provide more conclusive answers to the control mechanisms and influential parameters of heat transfer in nanofluids.

No MeSH data available.


Related in: MedlinePlus

Probability function of enhancement of heat transfer due to convection/mixed.
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Figure 3: Probability function of enhancement of heat transfer due to convection/mixed.

Mentions: Strong evidence of heat transfer enhancement by nanofluids for convective or mixed heat transfer mode is indicated in the histogram of Figure 3. Most data indicate a convective heat transfer coefficient enhancement between 10 and 19% (18% of the sample). However, the spread of the enhancement results is very large. The majority of the results (around 45% of the sample) indicated unspecified enhancement. There is also weak statistical indication of nanofluids causing deterioration of the heat transfer coefficient (11% of the sample) and an even smaller percentage of the sample indicating no enhancement at all (3% of the sample). Therefore, the statistical analysis for convective heat transfer is less consistent than for conduction, which supports the need for more research.


Anomalous heat transfer modes of nanofluids: a review based on statistical analysis.

Sergis A, Hardalupas Y - Nanoscale Res Lett (2011)

Probability function of enhancement of heat transfer due to convection/mixed.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211485&req=5

Figure 3: Probability function of enhancement of heat transfer due to convection/mixed.
Mentions: Strong evidence of heat transfer enhancement by nanofluids for convective or mixed heat transfer mode is indicated in the histogram of Figure 3. Most data indicate a convective heat transfer coefficient enhancement between 10 and 19% (18% of the sample). However, the spread of the enhancement results is very large. The majority of the results (around 45% of the sample) indicated unspecified enhancement. There is also weak statistical indication of nanofluids causing deterioration of the heat transfer coefficient (11% of the sample) and an even smaller percentage of the sample indicating no enhancement at all (3% of the sample). Therefore, the statistical analysis for convective heat transfer is less consistent than for conduction, which supports the need for more research.

Bottom Line: The application of nanofluids as coolants is a novel practise with no established physical foundations explaining the observed anomalous heat transfer.The most popular proposed mechanisms in the literature to explain heat transfer in nanofluids are revealed, as well as possible trends between nanofluid properties and thermal performance.The review also suggests future experimentation to provide more conclusive answers to the control mechanisms and influential parameters of heat transfer in nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: The Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK. a.sergis09@imperial.ac.uk.

ABSTRACT
This paper contains the results of a concise statistical review analysis of a large amount of publications regarding the anomalous heat transfer modes of nanofluids. The application of nanofluids as coolants is a novel practise with no established physical foundations explaining the observed anomalous heat transfer. As a consequence, traditional methods of performing a literature review may not be adequate in presenting objectively the results representing the bulk of the available literature. The current literature review analysis aims to resolve the problems faced by researchers in the past by employing an unbiased statistical analysis to present and reveal the current trends and general belief of the scientific community regarding the anomalous heat transfer modes of nanofluids. The thermal performance analysis indicated that statistically there exists a variable enhancement for conduction, convection/mixed heat transfer, pool boiling heat transfer and critical heat flux modes. The most popular proposed mechanisms in the literature to explain heat transfer in nanofluids are revealed, as well as possible trends between nanofluid properties and thermal performance. The review also suggests future experimentation to provide more conclusive answers to the control mechanisms and influential parameters of heat transfer in nanofluids.

No MeSH data available.


Related in: MedlinePlus