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Experimental investigation on heat transfer characteristics of various nanofluids in an indoor electric heater

Chen, Zhanxiu; Zheng, Dan; Wang, Jin LU ; Chen, Lei and Sundén, Bengt LU (2020) In Renewable Energy 147. p.1011-1018
Abstract

Heat transfer characteristics of an electric heater were experimentally investigated by using various fluids in this paper, including Cu-EGW (a mixture of ethylene glycol and DI-water), Al2O3-EGW, Fe3O4-EGW nanofluids. A 4:6 mixture of ethylene glycol and deionized water was used as the base liquid. All these nanofluids were prepared by ultrasonic treatment, and nanoparticle mass concentration of samples varies from 0.5% to 2%. In addition, natural convective heat transfer of Fe3O4-EGW nanofluid in an electric heater was carried out by considering an effect of different magnetic fields. The results indicated that heat transfer performance of Cu-EGW nanofluid was... (More)

Heat transfer characteristics of an electric heater were experimentally investigated by using various fluids in this paper, including Cu-EGW (a mixture of ethylene glycol and DI-water), Al2O3-EGW, Fe3O4-EGW nanofluids. A 4:6 mixture of ethylene glycol and deionized water was used as the base liquid. All these nanofluids were prepared by ultrasonic treatment, and nanoparticle mass concentration of samples varies from 0.5% to 2%. In addition, natural convective heat transfer of Fe3O4-EGW nanofluid in an electric heater was carried out by considering an effect of different magnetic fields. The results indicated that heat transfer performance of Cu-EGW nanofluid was significantly higher than the Al2O3-EGW and Fe3O4-EGW nanofluids, and the heating efficiency of the Cu-EGW nanofluid increased with the mass concentration of Cu particles. Compared with that of the base fluid, equilibrium temperature values of electric heaters filled with 2.0% Cu-EGW, 1.0% Al2O3-EGW and 1.0% Fe3O4-EGW nanofluids increase by 13.18%, 3.77% and 4.52%, respectively. It was also found that the magnetic field had a positive effect on the heat transfer enhancement of the Fe3O4-EGW nanofluid. In addition, for the 0.5% Fe3O4 nanofluid under a magnetic intensity of 100 mT, the equilibrium temperature on the middle fin increases by 14.68%.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electric heater, Equilibrium temperature, Magnetic field, Nanofluid, Natural convection
in
Renewable Energy
volume
147
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85072327949
ISSN
0960-1481
DOI
10.1016/j.renene.2019.09.036
language
English
LU publication?
yes
id
f5df8071-56a9-4e21-9244-c67ccc145bc9
date added to LUP
2019-09-27 14:02:16
date last changed
2019-09-27 14:02:16
@article{f5df8071-56a9-4e21-9244-c67ccc145bc9,
  abstract     = {<p>Heat transfer characteristics of an electric heater were experimentally investigated by using various fluids in this paper, including Cu-EGW (a mixture of ethylene glycol and DI-water), Al<sub>2</sub>O<sub>3</sub>-EGW, Fe<sub>3</sub>O<sub>4</sub>-EGW nanofluids. A 4:6 mixture of ethylene glycol and deionized water was used as the base liquid. All these nanofluids were prepared by ultrasonic treatment, and nanoparticle mass concentration of samples varies from 0.5% to 2%. In addition, natural convective heat transfer of Fe<sub>3</sub>O<sub>4</sub>-EGW nanofluid in an electric heater was carried out by considering an effect of different magnetic fields. The results indicated that heat transfer performance of Cu-EGW nanofluid was significantly higher than the Al<sub>2</sub>O<sub>3</sub>-EGW and Fe<sub>3</sub>O<sub>4</sub>-EGW nanofluids, and the heating efficiency of the Cu-EGW nanofluid increased with the mass concentration of Cu particles. Compared with that of the base fluid, equilibrium temperature values of electric heaters filled with 2.0% Cu-EGW, 1.0% Al<sub>2</sub>O<sub>3</sub>-EGW and 1.0% Fe<sub>3</sub>O<sub>4</sub>-EGW nanofluids increase by 13.18%, 3.77% and 4.52%, respectively. It was also found that the magnetic field had a positive effect on the heat transfer enhancement of the Fe<sub>3</sub>O<sub>4</sub>-EGW nanofluid. In addition, for the 0.5% Fe<sub>3</sub>O<sub>4</sub> nanofluid under a magnetic intensity of 100 mT, the equilibrium temperature on the middle fin increases by 14.68%.</p>},
  author       = {Chen, Zhanxiu and Zheng, Dan and Wang, Jin and Chen, Lei and Sundén, Bengt},
  issn         = {0960-1481},
  keyword      = {Electric heater,Equilibrium temperature,Magnetic field,Nanofluid,Natural convection},
  language     = {eng},
  pages        = {1011--1018},
  publisher    = {Elsevier},
  series       = {Renewable Energy},
  title        = {Experimental investigation on heat transfer characteristics of various nanofluids in an indoor electric heater},
  url          = {http://dx.doi.org/10.1016/j.renene.2019.09.036},
  volume       = {147},
  year         = {2020},
}