Impact analysis of natural convection on thermal conductivity measurements of nanofluids using the transient hot-wire method

Sung Wook Hong; Yong Tae Kang; Clement Kleinstreuer; Junemo Koo

doi:10.1016/j.ijheatmasstransfer.2011.03.041

Impact analysis of natural convection on thermal conductivity measurements of nanofluids using the transient hot-wire method

Sung Wook Hong, Yong Tae Kang, Clement Kleinstreuer, Junemo Koo

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

Significant deviations between published results have been reported measuring the effective thermal conductivity of nanofluids with the transient hot-wire method (THWM). This may be attributed to a poor selection of the temperature data range, which should meet the following conditions. The start time should be chosen after the conductive heat flux delay time, while the end time should be selected before a crossover point when natural convection becomes significant. Considering an EG-based 1.06 vol.% ZnO nanofluid, the thermal conductivity was measured to increase by 5.4% over that of the base fluid.

Original language	English
Pages (from-to)	3448-3456
Number of pages	9
Journal	International Journal of Heat and Mass Transfer
Volume	54
Issue number	15-16
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2011.03.041
Publication status	Published - 2011 Jul
Externally published	Yes

Keywords

Nanofluids
Natural convection
Thermal conductivity
Transient hot-wire method (THWM)

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatmasstransfer.2011.03.041

Cite this

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title = "Impact analysis of natural convection on thermal conductivity measurements of nanofluids using the transient hot-wire method",

abstract = "Significant deviations between published results have been reported measuring the effective thermal conductivity of nanofluids with the transient hot-wire method (THWM). This may be attributed to a poor selection of the temperature data range, which should meet the following conditions. The start time should be chosen after the conductive heat flux delay time, while the end time should be selected before a crossover point when natural convection becomes significant. Considering an EG-based 1.06 vol.% ZnO nanofluid, the thermal conductivity was measured to increase by 5.4% over that of the base fluid.",

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AU - Hong, Sung Wook

AU - Kang, Yong Tae

AU - Kleinstreuer, Clement

AU - Koo, Junemo

PY - 2011/7

Y1 - 2011/7

N2 - Significant deviations between published results have been reported measuring the effective thermal conductivity of nanofluids with the transient hot-wire method (THWM). This may be attributed to a poor selection of the temperature data range, which should meet the following conditions. The start time should be chosen after the conductive heat flux delay time, while the end time should be selected before a crossover point when natural convection becomes significant. Considering an EG-based 1.06 vol.% ZnO nanofluid, the thermal conductivity was measured to increase by 5.4% over that of the base fluid.

AB - Significant deviations between published results have been reported measuring the effective thermal conductivity of nanofluids with the transient hot-wire method (THWM). This may be attributed to a poor selection of the temperature data range, which should meet the following conditions. The start time should be chosen after the conductive heat flux delay time, while the end time should be selected before a crossover point when natural convection becomes significant. Considering an EG-based 1.06 vol.% ZnO nanofluid, the thermal conductivity was measured to increase by 5.4% over that of the base fluid.

KW - Nanofluids

KW - Natural convection

KW - Thermal conductivity

KW - Transient hot-wire method (THWM)

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VL - 54

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EP - 3456

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

IS - 15-16

ER -

Impact analysis of natural convection on thermal conductivity measurements of nanofluids using the transient hot-wire method

Abstract

Keywords

ASJC Scopus subject areas

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