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Experimental study of slot jet impingement heat transfer on a wedge-shaped surface

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Abstract

An experimental investigation was conducted to study the convective heat transfer rate from a wedge-shaped surface to a rectangular subsonic air jet impinging onto the apex of the wedge. The jet Reynolds number, nozzle-to-surface distance and the wedge angle were considered as the main parameters. Jet Reynolds number was ranged from 5,000 to 20,000 and two dimensionless nozzle-to-surface distances h/w = 4 and 10 were examined. The apex angle of the wedge ranged from 30° to 180° where the latter case corresponds with that of a flat surface. Velocity profile and turbulence intensity were provided for free jet flow using hot wire anemometer. Local and average Nusselt numbers on the impinged surface are presented for all the configurations. Based on the results presented, the local Nusselt number at the stagnation region increases as the wedge angle is decreased but, it then decreases over the remaining area of the impinged surface. Average Nusselt number over the whole surface is maximum when the wedge angle is 180° (i.e. plane surface) for any jet and nozzle-to-surface configuration.

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Abbreviations

A :

Surface area of the foil (M2)

h :

Distance from the nozzle exit to the apex of the wedge (m)

h conv :

Convective heat transfer coefficient (W/m2 K)

h o :

Natural convection coefficient (W/m2 K)

I :

Electric current (A)

k :

Thermal conductivity (W/m K)

L :

Width of the foil (m)

Nu :

Nusselt number (h conv w/k)

q conv :

Heat transfer rate from the foil to the air jet (W/m2)

q cond :

Heat transfer rate by conduction (W/m2)

q gen :

Heat rate generation within the foil (W/m2)

q rad :

Heat transfer rate from the foil by radiation (W/m2)

Re:

Jet reynolds number (uw/ν)

T s :

Surface temperature (K)

T ∞ :

Ambient air temperature (K)

t :

Thickness of the foil (m)

u :

Nozzle exit velocity (m/s)

V :

Electric voltage (V)

w :

Width of the rectangular nozzle (m)

y :

Streamwise direction on the foil

Y :

Non-dimensional streamwise distance (y/w)

ε:

Emissivity of the foil

θ:

Apex angle of the wedge

σ:

Boltzmann constant

al :

Aluminum

w :

Wood

i :

Foil surface element

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Authors and Affiliations

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

    Mostafa Rahimi & Mohammad Irani

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  1. Mostafa Rahimi
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  2. Mohammad Irani
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Correspondence to Mostafa Rahimi.

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Rahimi, M., Irani, M. Experimental study of slot jet impingement heat transfer on a wedge-shaped surface. Heat Mass Transfer 48, 2095–2101 (2012). https://doi.org/10.1007/s00231-012-1054-2

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  • DOI: https://doi.org/10.1007/s00231-012-1054-2

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