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Slot jet impingement heat transfer for the cases of moving plate and moving nozzle

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Abstract

Jet impingement heat transfer for the case of extended surfaces is usually accomplished by employing arrays of impinging jets. Both the cases of moving plate and moving nozzle could be other options to transfer heat to/from the extended surfaces, which has been investigated numerically at the present study. Heat transfer distribution on a hot stationary flat plate was first specified for an unconfined slot laminar air jet impinging on the plate. Air jet Reynolds number and nozzle-to-plate separation were Re = 500 and H/W = 5, respectively. The effects of the moving plate and moving nozzle were then separately examined on both the flow and thermal fields. The distribution of the local Nusselt numbers was presented for a range of moving nozzle and moving plate. The analysis revealed that the Nusselt number decreased as the velocity of the plate or the nozzle was increased, where the effect of the moving nozzle was relatively substantial.

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Abbreviations

c p :

Specific heat of air at constant pressure (1006.43 J/kg-K)

H :

Nozzle-to-plate separation (m)

h :

Convective heat transfer coefficient (W/m2-K)

k :

Thermal conductivity of air (0.0242 W/m–K)

Nu :

Nusselt number (hW/k)

p :

Pressure (N/m2)

Re:

Jet Reynolds number (ρV j W/μ)

T :

Temperature (K)

t :

Time (sec)

u :

x-Velocity component (m/s)

V :

Velocity (m/s)

v :

y-Velocity component (m/s)

W :

Width of the slot nozzle (m)

X :

Dimensionless longitudinal direction (x/W)

x :

Cartesian coordinate (m)

y :

Dimensionless normal direction (y/W)

Y :

Cartesian coordinate (m)

y 1 :

Distance of the first grid line from the solid surface (mm)

y 2 :

Uniform grid size far from the solid surface (mm)

ρ:

Air density (1.225 kg/m3)

μ:

Air dynamic viscosity (1.7894 × 10−5 kg/m-s)

j :

Jet

n :

Nozzle

p :

Impinged plate

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran

    Mostafa Rahimi & Roghayeh Azimi Soran

Authors
  1. Mostafa Rahimi
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  2. Roghayeh Azimi Soran
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Correspondence to Mostafa Rahimi.

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Technical Editor: Jose A. dos Reis Parise.

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Rahimi, M., Soran, R.A. Slot jet impingement heat transfer for the cases of moving plate and moving nozzle. J Braz. Soc. Mech. Sci. Eng. 38, 2651–2659 (2016). https://doi.org/10.1007/s40430-016-0496-8

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  • DOI: https://doi.org/10.1007/s40430-016-0496-8

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