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Effect of micro-pin characteristics on flow and heat transfer by a circular jet impinging to the flat surface

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Abstract

The effects of micro-pin characteristics on flow and heat transfer of a circular impinging jet are studied both experimentally and numerically. The studies are carried out for a single jet impinging (D = 24 mm) on a target plate that roughened by 48 micro-pins. The target surface is heated by a silicon rubber heater under a uniform heat flux of 2000 W m−2. Two Re numbers (20,000 and 40,000), three distances between the pins and the jet (S/D = 1, S/D = 2, S/D = 3) and three nozzle-to-surface distance ratios (0.5, 1 and 2) are considered. Experimental and numerical results confirm that using micro-pin on the target surface has a significant effect on the distributions of Nusselt number. In addition, the results show that using the micro-pin on the target plate may result in both decrease and increase in the averaged Nusselt number depending on the arrangement of the micro-pins. For the Reynolds number of 40,000, the presence of the micro-pins at S/D = 2.0 can increase the average Nusselt number by 10.8%, 10.1% and 11% at H/D = 0.5, 1.0 and 2.0, respectively.

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Abbreviations

C p :

Specific heat (N m kg−1 K−1)

d :

Pin diameter (mm)

D :

Nozzle diameter (mm)

H :

Nozzle-to-surface spacing (mm)

k :

Turbulence kinetic energy (m2 s−2)

Nu:

Local Nusselt number

P :

Static pressure (Pa)

q″:

Heat flux (W m−2)

Re:

Reynolds number

S :

The distance of pins to impingement point

R :

The target plate radius

T :

Temperature (K)

u :

Velocity (m s−1)

X :

Coordinates (x, y, s)

y + :

Dimensionless distance

ε :

Turbulent dissipation rate (m2 s−3)

k :

Turbulent kinetic energy (m2 s−2)

μ :

Dynamic viscosity (N s m−2)

ρ :

Density (kg m−3)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Semnan University, P.O.B. 35131-191, Semnan, Iran

    Amirhosein Hadipour & Mehran Rajabi Zargarabadi

  2. Department of Energy, Materials and Energy Research Center (MERC), Karaj, Iran

    Maziar Dehghan

Authors
  1. Amirhosein Hadipour
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  2. Mehran Rajabi Zargarabadi
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  3. Maziar Dehghan
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Correspondence to Mehran Rajabi Zargarabadi.

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Hadipour, A., Rajabi Zargarabadi, M. & Dehghan, M. Effect of micro-pin characteristics on flow and heat transfer by a circular jet impinging to the flat surface. J Therm Anal Calorim 140, 943–951 (2020). https://doi.org/10.1007/s10973-019-09232-2

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  • DOI: https://doi.org/10.1007/s10973-019-09232-2

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