Abstract
In the present work, we report the convective heat transfer coefficient and pressure drop of water-ethylene glycol mixture seeded with graphene nanoplatelets under laminar, transition and turbulent flow regions. Sodium deoxycholate was used as the surfactant to prepare stable nanofluid dispersions. Thermophysical properties of nanofluids were measured experimentally. Experimental investigations on the convective heat transfer coefficient and pressure drop were performed in a tube-in-tube counter flow heat exchanger using nanofluid as the hot fluid and chilled water as the cold fluid. The effects of nanofluid inlet temperature on the convective heat transfer coefficient and pressure drop were investigated for different mass flow rates. The enhancement of convective heat transfer coefficient was found to increase with respect to Reynolds number, graphene loading and inlet temperature. The maximum enhancement of convective heat transfer coefficient is observed to be ∼170% at 0.5 vol% in the turbulent region. The pressure drop increment of the nanofluid is predominant in the laminar region as compared to turbulent region. The enhancement of pressure drop is moderate in the turbulent region which favours these nanofluids to be used in the thermal systems for different engineering applications.
| Original language | English |
|---|---|
| Pages (from-to) | 67-76 |
| Number of pages | 10 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 80 |
| DOIs | |
| Publication status | Published - Jan 1 2017 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Nuclear Energy and Engineering
- Aerospace Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes
Cite this
Convective heat transfer coefficient and pressure drop of water-ethylene glycol mixture with graphene nanoplatelets. / Selvam, C.; Balaji, T.; Mohan Lal, D.; Sivasankaran, Harish.
In: Experimental Thermal and Fluid Science, Vol. 80, 01.01.2017, p. 67-76.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Convective heat transfer coefficient and pressure drop of water-ethylene glycol mixture with graphene nanoplatelets
AU - Selvam, C.
AU - Balaji, T.
AU - Mohan Lal, D.
AU - Sivasankaran, Harish
PY - 2017/1/1
Y1 - 2017/1/1
N2 - In the present work, we report the convective heat transfer coefficient and pressure drop of water-ethylene glycol mixture seeded with graphene nanoplatelets under laminar, transition and turbulent flow regions. Sodium deoxycholate was used as the surfactant to prepare stable nanofluid dispersions. Thermophysical properties of nanofluids were measured experimentally. Experimental investigations on the convective heat transfer coefficient and pressure drop were performed in a tube-in-tube counter flow heat exchanger using nanofluid as the hot fluid and chilled water as the cold fluid. The effects of nanofluid inlet temperature on the convective heat transfer coefficient and pressure drop were investigated for different mass flow rates. The enhancement of convective heat transfer coefficient was found to increase with respect to Reynolds number, graphene loading and inlet temperature. The maximum enhancement of convective heat transfer coefficient is observed to be ∼170% at 0.5 vol% in the turbulent region. The pressure drop increment of the nanofluid is predominant in the laminar region as compared to turbulent region. The enhancement of pressure drop is moderate in the turbulent region which favours these nanofluids to be used in the thermal systems for different engineering applications.
AB - In the present work, we report the convective heat transfer coefficient and pressure drop of water-ethylene glycol mixture seeded with graphene nanoplatelets under laminar, transition and turbulent flow regions. Sodium deoxycholate was used as the surfactant to prepare stable nanofluid dispersions. Thermophysical properties of nanofluids were measured experimentally. Experimental investigations on the convective heat transfer coefficient and pressure drop were performed in a tube-in-tube counter flow heat exchanger using nanofluid as the hot fluid and chilled water as the cold fluid. The effects of nanofluid inlet temperature on the convective heat transfer coefficient and pressure drop were investigated for different mass flow rates. The enhancement of convective heat transfer coefficient was found to increase with respect to Reynolds number, graphene loading and inlet temperature. The maximum enhancement of convective heat transfer coefficient is observed to be ∼170% at 0.5 vol% in the turbulent region. The pressure drop increment of the nanofluid is predominant in the laminar region as compared to turbulent region. The enhancement of pressure drop is moderate in the turbulent region which favours these nanofluids to be used in the thermal systems for different engineering applications.
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U2 - 10.1016/j.expthermflusci.2016.08.013
DO - 10.1016/j.expthermflusci.2016.08.013
M3 - Article
VL - 80
SP - 67
EP - 76
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
ER -