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Computational flow and heat transfer of multiple circular jets impinging on a flat surface with effusion

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Abstract

Computational investigations are reported on the local flow and heat transfer characteristics from staggered, multiple circular air jets impinging on a flat surface with effusion holes. The geometrical and flow parameters for the computational study are chosen as per the experimental arrangement of Cho and Rhee J Turbomachinery 123:601–608, (14) so as to explain salient features observed in these experiments. The two peaks in the Nusselt number observed in the case of H/D = 6 and three peaks in the case of H/D = 2 are attributed to the flow characteristics such as primary vortices forming an up-wash region, followed by secondary vortices resulting in a secondary stagnation zone. The magnitude of local peak in heat transfer increases up to 88% with increasing values of D/d from 0.5 to 1.5 at Re = 10,000.

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Abbreviations

c:

Center to center distance of jet holes, m

D:

Diameter of jet hole, m

d:

Diameter of film hole, m

H:

Distance between target surface and jet hole exit, m

kf :

Thermal conductivity of fluid, W/m–K

m:

Mass flow rate, kg/sec

Nu:

Nusselt number

q″:

Local heat flux, W/m2

p:

Local static pressure, N/m2

pmax :

Maximum local static pressure, N/m2

Cp :

Pressure coefficient (p/p max)

p0 :

Stagnation pressure, N/m2

Tj :

Jet temperature, K

Ttp :

Target plate temperature, K

v:

Velocity magnitude in y—direction, m/s

U:

Jet exit velocity, m/s

t1 :

Jet plate thickness, m

t2 :

Target plate thickness, m

x:

x-co-ordinate, m

y:

y-co-ordinate, m

z:

z-co-ordinate, m

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Authors and Affiliations

  1. Thermal Turbo machines Laboratory, Indian Institute of Technology Madras, Chennai, 600 036, India

    M. Ashok kumar & B. V. S. S. S. Prasad

Authors
  1. M. Ashok kumar
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  2. B. V. S. S. S. Prasad
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Correspondence to B. V. S. S. S. Prasad.

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Ashok kumar, M., Prasad, B.V.S.S.S. Computational flow and heat transfer of multiple circular jets impinging on a flat surface with effusion. Heat Mass Transfer 47, 1121–1132 (2011). https://doi.org/10.1007/s00231-011-0776-x

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  • DOI: https://doi.org/10.1007/s00231-011-0776-x

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