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Reliability of Nanofluid Concentration on the Heat Transfer Augmentation in Engine Radiator

  • Ibrahim Elbadawy
  • Mohamed Elsebay
  • Mohamed Shedid
  • Mohamed Fatouh
Article
  • 46 Downloads

Abstract

Nanofluids, the fluid suspensions of nanomaterial, became a promising fluid that is invoked when heat transfer increase is required. Using of nanofluids as a coolant in the engine radiators is a crucial topic for the thermal engines manufactrers due to the expected enhancement in the cooling process. In this study, Two nanofluids (Al2O3/water and CuO/water) flowing in a flat tube of radiator are investigated numerically to evaluate thermal and flow performance. The resizing process for the radiator is performed by using nanofluid instead of water flow. A significant reduction in the radiator volume is achieved due to marked improvement in the heat transfer performance while, the required pumping power after this reduction in the volume is increased over that needed for base fluid. The normalized heat transfer (heat transfer to the pumping power) is found to be a function of both Reynolds number and nanofluid concentration ratio while the ratio of the normalized heat transfer is found to be dependent only on the nanofluid concentration ratio. These dependencies are formulated as general correlations.

Key Words

Sizing Radiator Heat transfer enhancement Concentration ratio Nanofluids 

Nomenclature

A

tube cross sectional area, m2

Cf

skin friction coefficient, −

Cp

specific heat, J/kg.k

Dh

hydraulic diameter, m.

h

heat transfer coefficient, W/m2.K

ho

outside heat transfer coefficient, W/m2.K

hr

ratio of heat transfer coefficients, hav,nf/hav,bf, −

K

thermal conductivity, W/m.K

L

tube length, m

mass flow rate, kg/s

Nu

nusselt number, −

p

pressure, Pa

Pm

perimeter, m

P

pumping power, W

V

velocity, m/s

Z

axial distance from inlet, m

α

non-dimensional quantity a = Q/P, −

αr

ratio of normalized heat transfer for nanofluid to that of pure water (αr = αnf /αbf), −

β

ratio of the nanolayer thickness to the original particle radius, β = 0.1, −

φ

nanoparticle volumetric concentration, %

μ

dynamic viscosity, kg/m.s

ρ

density, kg/m3

t

shear stress, N/m2

Subscripts

amb

ambient

av

average

b

bulk

bf

base fluid

in

inlet

nf

nanofluid

out

outlet

P

particle

S

surface

Z

local axial position

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Ibrahim Elbadawy
    • 1
    • 2
  • Mohamed Elsebay
    • 1
  • Mohamed Shedid
    • 1
    • 3
  • Mohamed Fatouh
    • 1
  1. 1.Department of Mechanical Power Engineering, Faculty of Engineering at El-MattariaHelwan UniversityCairoEgypt
  2. 2.Department of Mechanical Engineering, College of Engineering and TechnologyAmerican University of the Middle EastEqailaKuwait
  3. 3.Mechanical Engineering DepartmentSur University CollegeSurOman

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