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Computational Study of Mist Jet Impingement Heat Transfer on a Flat Plate with Slotted Nozzle

  • Bikram Kumar Pani
  • Dushyant SinghEmail author
Conference paper
Part of the Lecture Notes in Intelligent Transportation and Infrastructure book series (LNITI)

Abstract

The work presents the numerical investigation of a slot mist jet impingement cooling on an isothermal flat plate surface at three different temperatures 323, 350 and 363 K. A two-dimensional model was analyzed with mist (air and water) as working fluid. The distance from nozzle exit to the surface of the heated plate is varied from h/S = 4 and 8. The numerical analysis was carried out for jet Reynolds number Res = 2750 varying the volume fraction, vof 1–10% and size of droplet from 1 to 300 micron. Addition of mist causes significant increase of heat transfer coefficient as compared to the single-phase heat transfer coefficient. The numerical result of local heat transfer coefficient is compared with the experimental results of Gardon and Akfirat [1]. Also, the effect of heat transfer coefficient varying the distance from nozzle to plate spacing is shown. The turbulence models k − ε and k − ω SST were considered for the study, and their differences are also presented.

Keywords

Jet impingement Mist Droplet Volume fraction 

Nomenclature

S

Slot width (m)

h

Slot height from plate (m)

X

Length of the plate (m)

q

Heat flux (W/m2)

H

Heat transfer coefficient (W/m2K)

Tw

Temperature of plate (K)

Tj

Temperature of jet (K)

U

Average velocity (m/s)

K

Turbulent kinetic energy (m2/s2)

P

Pressure (pa)

D

Diameter of droplet (m)

N

Component

I

Mass transfer rate (Kg/s)

i, j, k

Indices

g

Gravitational acceleration (m/s2)

F

Interactive force per unit volume (N/m3)

Q

Rate of heat transfer per unit mass (W/Kg)

W

Rate of work done per unit mass (J/kg)

E

Total internal energy per unit mass (J/kg)

TI

Turbulence intensity

D0

Diameter of the jet (m)

T

Temperature of the jet (K)

e*

Total internal energy per unit mass

vof

Volume fraction

Greek Symbols

µ

Dynamic viscosity (Pas)

ρ

Mass density (kg/m3)

α

Volume fraction

ε

Turbulent dissipation rate (m2/S3)

\( \omega \)

Specific dissipation rate

\( \nu \)

Kinematic viscosity

σc

Phase stress tensor (Pa)

Notations

∂/∂t ∂/∂x

Partial derivative

Non-dimensional Numbers

ReS

Reynolds number [ρUS/µ]

References

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.National Institute of Technology ManipurLangolIndia

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