Abstract
This study experimentally investigates non-uniform particle distributions and evaporation characteristics of nanofluid droplets containing 50 nm average diameter alumina (Al2O3) particles, on a hydrophilic glass surface. Using an inverted microscope, the size distribution of aggregated nanoparticles was visualized and analyzed at different sight-of-view locations. From the digital images captured using CMOS cameras and a magnifying lens, the effect of particle concentrations on droplet evaporation rates was examined. In particular, in order to understand the significance of the early stage of droplet evaporation, the dynamics of a corresponding triple line were visualized using a high-speed imaging technique. From the results, it was found that as the volume fraction of nanoparticles in nanofluids increased the total evaporation time and the initial contact angle decreased, while the corresponding perimeter of the droplet increased. Local aggregation was observed when a nanofluid droplet was in contact on the surface, suggesting that the non-homogeneous characteristics should be considered in estimating thermal conductivity of a nanofluid droplet.
| Original language | English |
|---|---|
| Pages (from-to) | 336-344 |
| Number of pages | 9 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 72 |
| DOIs | |
| Publication status | Published - 2014 May 1 |
| Externally published | Yes |
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Keywords
- Aggregation
- Evaporation
- Nanofluid
- Nanofluid thin layer
- Spatial non-uniformity
- Total evaporation time
ASJC Scopus subject areas
- Mechanical Engineering
- Condensed Matter Physics
- Fluid Flow and Transfer Processes
Cite this
Local aggregation characteristics of a nanofluid droplet during evaporation. / Shin, Dong Hwan; Choi, Chang Kyoung; Kang, Yong Tae; Lee, Seong Hyuk.
In: International Journal of Heat and Mass Transfer, Vol. 72, 01.05.2014, p. 336-344.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Local aggregation characteristics of a nanofluid droplet during evaporation
AU - Shin, Dong Hwan
AU - Choi, Chang Kyoung
AU - Kang, Yong Tae
AU - Lee, Seong Hyuk
PY - 2014/5/1
Y1 - 2014/5/1
N2 - This study experimentally investigates non-uniform particle distributions and evaporation characteristics of nanofluid droplets containing 50 nm average diameter alumina (Al2O3) particles, on a hydrophilic glass surface. Using an inverted microscope, the size distribution of aggregated nanoparticles was visualized and analyzed at different sight-of-view locations. From the digital images captured using CMOS cameras and a magnifying lens, the effect of particle concentrations on droplet evaporation rates was examined. In particular, in order to understand the significance of the early stage of droplet evaporation, the dynamics of a corresponding triple line were visualized using a high-speed imaging technique. From the results, it was found that as the volume fraction of nanoparticles in nanofluids increased the total evaporation time and the initial contact angle decreased, while the corresponding perimeter of the droplet increased. Local aggregation was observed when a nanofluid droplet was in contact on the surface, suggesting that the non-homogeneous characteristics should be considered in estimating thermal conductivity of a nanofluid droplet.
AB - This study experimentally investigates non-uniform particle distributions and evaporation characteristics of nanofluid droplets containing 50 nm average diameter alumina (Al2O3) particles, on a hydrophilic glass surface. Using an inverted microscope, the size distribution of aggregated nanoparticles was visualized and analyzed at different sight-of-view locations. From the digital images captured using CMOS cameras and a magnifying lens, the effect of particle concentrations on droplet evaporation rates was examined. In particular, in order to understand the significance of the early stage of droplet evaporation, the dynamics of a corresponding triple line were visualized using a high-speed imaging technique. From the results, it was found that as the volume fraction of nanoparticles in nanofluids increased the total evaporation time and the initial contact angle decreased, while the corresponding perimeter of the droplet increased. Local aggregation was observed when a nanofluid droplet was in contact on the surface, suggesting that the non-homogeneous characteristics should be considered in estimating thermal conductivity of a nanofluid droplet.
KW - Aggregation
KW - Evaporation
KW - Nanofluid
KW - Nanofluid thin layer
KW - Spatial non-uniformity
KW - Total evaporation time
UR - http://www.scopus.com/inward/record.url?scp=84893303994&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84893303994&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2014.01.023
DO - 10.1016/j.ijheatmasstransfer.2014.01.023
M3 - Article
VL - 72
SP - 336
EP - 344
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -