Overall heat transfer coefficient improvement of an automobile radiator with graphene based suspensions

C. Selvam, R. Solaimalai Raja, D. Mohan Lal, Harish Sivasankaran

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In the present work, we report the enhancement in overall heat transfer coefficient of an automobile radiator using graphene nanoplatelets based nanofluid as the coolant. Water-ethylene glycol mixture (70:30 by volume) was used as the base fluid and stable nanofluids were synthesized by non-covalent functionalization method with volume concentrations of graphene nanoplatelets varying from 0.1% to 0.5%. Experiments were performed in an automobile radiator for varying nanofluid mass flow rates viz. 12.5 g/s, 25 g/s, 37.5 g/s, 50 g/s, 62.5 g/s and two nanofluid inlet temperatures viz. 35 °C, 45 °C and air velocity. For each condition the ambient air velocity was varied from 1 m/s to 5 m/s in steps of 1 m/s. The convective heat transfer coefficient of nanofluid and overall heat transfer coefficient are found to increase with respect to mass flow rate, inlet temperature of nanofluid and graphene nanoplatelets loading. The improvement in convective heat transfer coefficient of nanofluid play a significant role in the enhancement of overall heat transfer coefficient. The maximum enhancement in OHTC with respect to concentration is found to be ∼104% at 35 °C while it is found to be ∼81% at 45 °C for 0.5 vol%, 62.5 g/s flow rate and 5 m/s air velocity. Further, the pressure drop of nanofluids increases with increase in mass flow rate and graphene loading. The increase in pressure drop is significantly influenced by the mass flow rate than by graphene nanoplatelets loading.

Original languageEnglish
Pages (from-to)580-588
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume115
DOIs
Publication statusPublished - Dec 1 2017

Fingerprint

Automobile radiators
Graphite
automobiles
radiators
heat transfer coefficients
Graphene
Heat transfer coefficients
mass flow rate
Suspensions
graphene
Flow rate
inlet temperature
convective heat transfer
pressure drop
Pressure drop
augmentation
air
Air
Ethylene Glycol
coolants

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Overall heat transfer coefficient improvement of an automobile radiator with graphene based suspensions. / Selvam, C.; Solaimalai Raja, R.; Mohan Lal, D.; Sivasankaran, Harish.

In: International Journal of Heat and Mass Transfer, Vol. 115, 01.12.2017, p. 580-588.

Research output: Contribution to journalArticle

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