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Heat transfer from an open-wedge cavity to a symmetrically impinging slot air jet

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Abstract

Heat transfer from an open-wedge cavity to a symmetrically impinging slot air jet is investigated at the present study. The effect of the cavity angle was mainly examined on the Nusselt number distribution. Based on the results, heat transfer was generally poor at the vicinity of the apex, rising to form a maximum at the impingement and then followed by a moderate decline at further distances. The region of maximum heat transfer on the surfaces shifted outward the cavity as the cavity angle was decreased. Also, average Nusselt number over an effective length of the surface remained almost constant and independent of the cavity angle for a specified jet Reynolds number and nozzle-to-apex spacing.

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Abbreviations

A :

Surface area of the plate (m2)

h :

Distance from the nozzle exit to the apex of the cavity (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)

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 generation rate within the copper layer (W/m2)

q rad :

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

Re :

Jet Reynolds number, uw/ν

T :

Temperature (K)

T :

Ambient air temperature (K)

t :

Thickness of the plate (m)

u :

Nozzle exit velocity (m/s)

V :

Electric voltage (V)

w :

Width of the rectangular nozzle (m)

x :

Streamwise direction on the foil

X :

Non-dimensional streamwise distance, x/w

z :

Vertical direction (m)

ε :

Emissivity of the foil

θ :

Cavity angle

σ :

Boltzmann constant

pl :

Plastic sub-layer

in :

Insulating layer

i :

Plate surface element

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Correspondence to Mostafa Rahimi.

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Rahimi, M., Mazraeh, A.E. Heat transfer from an open-wedge cavity to a symmetrically impinging slot air jet. Heat Mass Transfer 50, 1137–1143 (2014). https://doi.org/10.1007/s00231-014-1328-y

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  • DOI: https://doi.org/10.1007/s00231-014-1328-y

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