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Local heat transfer distribution between smooth flat surface and impinging air jet from a circular nozzle at low Reynolds numbers

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Abstract

An experimental investigation is performed to study the effect of jet to plate spacing and low Reynolds number on the local heat transfer distribution to normally impinging submerged circular air jet on a smooth and flat surface. A single jet from a straight circular nozzle of length-to-diameter ratio (l/d) of 83 is tested. Reynolds number based on nozzle exit condition is varied between 500 and 8,000 and jet-to-plate spacing between 0.5 and 8 nozzle diameters. The local heat transfer characteristics are obtained using thermal images from infrared thermal imaging technique. It was observed that at lower Reynolds numbers, the effect of jet to plate distances covered during the study on the stagnation point Nusselt numbers is minimal. At all jet to plate distances, the stagnation point Nusselt numbers decrease monotonically with the maximum occurring at a z/d of 0.5 as opposed to the stagnation point Nusselt numbers at high Reynolds numbers which occur around a z/d of 6.

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Abbreviations

A :

Surface area for smooth surface (m2)

d :

Diameter of the nozzle exit (m)

h :

Heat transfer coefficient (W/m2 K)

I :

Current (A)

k :

Thermal conductivity of air (W/m K)

l :

Length of the nozzle pipe (m)

Nu :

Nusselt number (hd/k)

Nu o :

Stagnation Nusselt number (hd/k)

q :

Heat flux (W/m2)

q conv :

Net heat flux convected to the impinging jet (W/m2)

q joule :

Imposed Ohmic heat flux, (VI/A) (W/m2)

q loss :

Total heat flux loss from impingement plate (W/m2)

q rad(f) :

Radiation heat loss from the front surface of impingement plate (W/m2)

q rad(b) :

Radiation heat loss from the back surface of impingement plate (W/m2)

q nat :

Heat loss by natural convection from the back surface of impingement plate (W/m2)

r :

Radial distance from the stagnation point (m)

Re :

Reynolds number \( (\rho \bar{v}d/\mu ) \)

T j :

Jet air temperature (°C)

T r :

Temperature of the target plate at given radial location (°C)

V :

Voltage (V)

\( \bar{v} \) :

Average velocity of flow at nozzle exit (m/s)

z :

Nozzle plate spacing (m)

μ :

Viscosity of air (Pa s)

ρ :

Density of air corresponding to supply pressure (kg/m3)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai, Maharastra, 400076, India

    Vadiraj V. Katti, S. Nagesh Yasaswy & S. V. Prabhu

Authors
  1. Vadiraj V. Katti
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  2. S. Nagesh Yasaswy
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  3. S. V. Prabhu
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Correspondence to S. V. Prabhu.

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Katti, V.V., Yasaswy, S.N. & Prabhu, S.V. Local heat transfer distribution between smooth flat surface and impinging air jet from a circular nozzle at low Reynolds numbers. Heat Mass Transfer 47, 237–244 (2011). https://doi.org/10.1007/s00231-010-0716-1

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  • DOI: https://doi.org/10.1007/s00231-010-0716-1

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