Local aggregation characteristics of a nanofluid droplet during evaporation

Dong Hwan Shin; Chang Kyoung Choi; Yong Tae Kang; Seong Hyuk Lee

doi:10.1016/j.ijheatmasstransfer.2014.01.023

Local aggregation characteristics of a nanofluid droplet during evaporation

Dong Hwan Shin, Chang Kyoung Choi, Yong Tae Kang, Seong Hyuk Lee

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

21 Citations (Scopus)

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	https://doi.org/10.1016/j.ijheatmasstransfer.2014.01.023
Publication status	Published - 2014 May
Externally published	Yes

Bibliographical note

Funding Information:
This work was sponsored by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0016837). Also, this work was supported by the Ministry of Trade, Industry & Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy ( No. 20114030200020 ). This research was sponsored, in part, by a Michigan Technological University Research Initiation Grant and by the Multi-Scale Technologies Institute (CKC).

Keywords

Aggregation
Evaporation
Nanofluid
Nanofluid thin layer
Spatial non-uniformity
Total evaporation time

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatmasstransfer.2014.01.023

Cite this

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title = "Local aggregation characteristics of a nanofluid droplet during evaporation",

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.",

keywords = "Aggregation, Evaporation, Nanofluid, Nanofluid thin layer, Spatial non-uniformity, Total evaporation time",

author = "Shin, {Dong Hwan} and Choi, {Chang Kyoung} and Kang, {Yong Tae} and Lee, {Seong Hyuk}",

note = "Funding Information: This work was sponsored by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0016837). Also, this work was supported by the Ministry of Trade, Industry & Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy ( No. 20114030200020 ). This research was sponsored, in part, by a Michigan Technological University Research Initiation Grant and by the Multi-Scale Technologies Institute (CKC).",

year = "2014",

month = may,

doi = "10.1016/j.ijheatmasstransfer.2014.01.023",

language = "English",

volume = "72",

pages = "336--344",

journal = "International Journal of Heat and Mass Transfer",

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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

N1 - Funding Information: This work was sponsored by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0016837). Also, this work was supported by the Ministry of Trade, Industry & Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy ( No. 20114030200020 ). This research was sponsored, in part, by a Michigan Technological University Research Initiation Grant and by the Multi-Scale Technologies Institute (CKC).

PY - 2014/5

Y1 - 2014/5

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

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M3 - Article

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SN - 0017-9310

VL - 72

SP - 336

EP - 344

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

ER -

Local aggregation characteristics of a nanofluid droplet during evaporation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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