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Experimental study on forced convective and subcooled flow boiling heat transfer coefficient of water-ethanol mixtures: an application in cooling of heat dissipative devices

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Abstract

The experimental study is carried out to determine forced convective and subcooled flow boiling heat transfer coefficient in conventional rectangular channels. The fluid is passed through rectangular channels of 0.01 m depth, 0.01 m width, and 0.15 m length. The parameters varied are heat flux, mass flux, inlet temperature and volume fraction of ethanol. Forced convective heat transfer coefficient increases with increase in heat flux and mass flux, but effect of mass flux is less significant. Subcooled flow boiling heat transfer increases with increase in heat flux and mass flux, but the effect of heat flux is dominant. During the subcooled flow boiling region, the effect of mass flux will not influence the heat transfer. The strong Marangoni effect will increase the heat transfer coeffient for mixture with 25% ethanol volume fraction. The results obtained for subcooled flow boiling heat transfer coefficient of water are compared with available literature correlations. It is found that Liu-Winterton equation predicts the experimental results better when compared with that of other literature correlations. An empirical correlation for subcooled flow boiling heat transfer coefficient as a function of mixture wall super heat, mass flux, volume fractions and inlet temperature is developed from the experimental results.

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Abbreviations

B o :

Boiling number

C p :

Specific heat (kJ/kg-K)

D h :

Hydraulic diameter (m)

E :

Enhancement factor

G :

Mass flux (kg/m2-s)

h :

Heat transfer coefficient (kW/m2-K)

h fg :

Latent heat of vaporization (kJ/kg)

k :

Thermal conductivity (kW/m-K)

M :

Molecular mass (kg/mol)

Nu :

Nusselt number

P :

Pressure (N/m2)

Pr:

Prandtl number

q " :

Heat flux (kW/m2)

Re :

Reynolds number

T :

Temperature (K)

T :

Temperature difference (K)

v f :

Volume fraction of ethanol (%)

x :

Vapour quality

X :

Position (m)

z* :

Dimensionless distance for thermally develo** flow

ρ :

Density (kg/m3)

μ :

Dynamic viscosity (kg/m-s)

ω :

Uncertainty

σ s :

Surface Tension (N/m)

χ tt :

Martinelli parameter

b :

Bubble point

cr :

Critical

d :

Dew point

f :

Fluid

fc :

Forced convection

fr :

First row

g :

Gaseous

i :

Independent parameter

l :

Liquid

in :

Inlet

pb :

Pool boiling

Sr :

Second row

tp :

Two phase

σ :

Standard deviation

W :

Wall

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Suhas, B.G., Sathyabhama, A. Experimental study on forced convective and subcooled flow boiling heat transfer coefficient of water-ethanol mixtures: an application in cooling of heat dissipative devices. Heat Mass Transfer 54, 277–290 (2018). https://doi.org/10.1007/s00231-017-2122-4

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  • DOI: https://doi.org/10.1007/s00231-017-2122-4

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