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Title: Surface tension of evaporating nanofluid droplets

Abstract

Measurements of nanofluid surface tension were made using the pendant droplet method. Three different types of nanoparticles were used - laponite, silver and Fe2O3 - with de-ionized water (DW) as the base fluid. The reported results focus on the following categories; (1) because some nanoparticles require surfactants to form stable colloids, the individual effects of the surfactant and the particles were investigated; (2) due to evaporation of the pendant droplet, the particle concentration increases, affecting the apparent surface tension; (3) because of the evaporation process, a hysteresis was found where the evaporating droplet can only achieve lower values of surface tension than that of nanofluids at the same prepared concentrations: and (4) the Stefan equation relating the apparent surface tension and heat of evaporation was found to be inapplicable for nanofluids investigated. Comparisons with findings for sessile droplets are also discussed, pointing to additional effects of nanoparticles other than the non-equilibrium evaporation process.

Authors:
 [1];  [2];  [2]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Fossil Energy (FE)
OSTI Identifier:
1014881
Report Number(s):
NETL-TPR-3252
Journal ID: ISSN 0017-9310
Resource Type:
Journal Article
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 54; Journal Issue: 11-12; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; NANOFLUIDS; SURFACE TENSION; EVAPORATING DROPLET; STEFAN's FORMULA

Citation Formats

Chen, Ruey-Hung, Phuoc, Tran X., and Martello, Donald. Surface tension of evaporating nanofluid droplets. United States: N. p., 2011. Web. doi:10.1016/j.ijheatmasstransfer.2011.02.016.
Chen, Ruey-Hung, Phuoc, Tran X., & Martello, Donald. Surface tension of evaporating nanofluid droplets. United States. https://doi.org/10.1016/j.ijheatmasstransfer.2011.02.016
Chen, Ruey-Hung, Phuoc, Tran X., and Martello, Donald. 2011. "Surface tension of evaporating nanofluid droplets". United States. https://doi.org/10.1016/j.ijheatmasstransfer.2011.02.016.
@article{osti_1014881,
title = {Surface tension of evaporating nanofluid droplets},
author = {Chen, Ruey-Hung and Phuoc, Tran X. and Martello, Donald},
abstractNote = {Measurements of nanofluid surface tension were made using the pendant droplet method. Three different types of nanoparticles were used - laponite, silver and Fe2O3 - with de-ionized water (DW) as the base fluid. The reported results focus on the following categories; (1) because some nanoparticles require surfactants to form stable colloids, the individual effects of the surfactant and the particles were investigated; (2) due to evaporation of the pendant droplet, the particle concentration increases, affecting the apparent surface tension; (3) because of the evaporation process, a hysteresis was found where the evaporating droplet can only achieve lower values of surface tension than that of nanofluids at the same prepared concentrations: and (4) the Stefan equation relating the apparent surface tension and heat of evaporation was found to be inapplicable for nanofluids investigated. Comparisons with findings for sessile droplets are also discussed, pointing to additional effects of nanoparticles other than the non-equilibrium evaporation process.},
doi = {10.1016/j.ijheatmasstransfer.2011.02.016},
url = {https://www.osti.gov/biblio/1014881}, journal = {International Journal of Heat and Mass Transfer},
issn = {0017-9310},
number = 11-12,
volume = 54,
place = {United States},
year = {Sun May 01 00:00:00 EDT 2011},
month = {Sun May 01 00:00:00 EDT 2011}
}