HEAT TRANSFER CHARACTERISTICS OF PROPYLENE GLYCOL/WATER BASED MAGNESIUM OXIDE NANOFLUID FLOWING THROUGH STRAIGHT TUBES AND HELICAL COILS

Year 2018, Volume: 4 Issue: 1, 1737 - 1755, 20.12.2017

Parminder Singh

https://doi.org/10.18186/journal-of-thermal-engineering.369007

Cited By: 4

Abstract

Forced
convective heat transfer studies on glycol based magnesium oxide nanofluids
flowing through straight tubes and helical coils under laminar flow and
constant wall temperature conditions have been conducted. Propylene glycol –
water mixture (60:40 by wt.%) was used as the base fluid and nanofluids with MgO
nano- particle volume concentration of 0.66% and 0.3% were used as the working
fluids. Results showed that the convective heat transfer coefficient of
nanofluid was higher than that of the base fluid for both straight tubes and
helical coils. In straight tube, Nusselt number enhancement was 20% w.r.t. base
fluid and it increased to 29% with increase in Peclet number from 44000 to
111400 for nanofluid having volume concentration of 0.66%.While in helical
coils, maximum enhancement in
experimental Nusselt number was found to be 19.5% and 23% at volume
concentration of 0.3% and 0.66 % respectively for a curvature ratio of 0.0727
corresponding to a Dean number of 490.Two new
correlations have been proposed to predict the heat transfer coefficient of
magnesium oxide nanofluid flowing under laminar conditions through straight
tube and helical coils. 

Keywords

Magnesium Oxide, Straight Tube, Helical Coil, Convective Heat Transfer Coefficient, Constant Wall Temperature, Nusselt Number

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