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Conical coaxial impinging air jets: angle effect on the heat transfer performance

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Abstract

Herein, an experimental attempt is conducted to research thermal and flow behaviors of an impinging jet exiting from a coaxial type nozzle with a conical outer and a circular inner outlets. The experiments include four different values of the cone angle (Φ = 0°, 10°, 20° and 30°) and several values of the separation distance between the nozzle outlet and the target surface (0.5 ≤ H / D ≤ 6). Tests are performed for a single value of total flowrate (1.33 × 10−3 m3 s−1). It is revealed that the local Nusselt numbers on the target surface increase with decreasing separation distance. Especially, in the close-range impingement conditions (H / D ≤ 2), the cone angle of 20o performs the optimum thermal performance. Both the rate and spatial uniformity of convective heat transfer strongly depend on the coupling of the nozzle-to-plate distance and angle. From the flow dynamics aspect, wall pressure distributions are measured, and positive and negative (subatmospheric) peaks are observed depending on the combined influence of angle and distance.

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Abbreviations

A r :

circular area on the plate [m2]

D :

outer diameter of the outer flow passage [m]

D i :

diameter of the inner circular passage [m]

H :

distance between the target surface and the nozzle outlet [m]

Nu :

local Nusselt number, Nu = h  D/k

Q :

volumetric flowrate [m3 s−1]

P :

pressure [Pa]

r∗:

dimensionless radial distance, r ∗  = r/D

R :

Correlation coefficient

r :

radial distance [m]

Re:

Reynolds number, Re = um  Di/v

u m :

mean velocity [m s−1]

Φ∗:

Modified cone angle, Φ ∗  = Φ  (180/π)

a :

(atmospheric)

j :

(jet)

o :

(outer)

st :

(stagnation)

tot :

(total)

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Authors and Affiliations

  1. Department of Energy Systems Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey

    Burak Markal

  2. Department of Mechanical Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey

    Mete Avci

  3. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Orhan Aydin

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Markal, B., Avci, M. & Aydin, O. Conical coaxial impinging air jets: angle effect on the heat transfer performance. Heat Mass Transfer 56, 3135–3146 (2020). https://doi.org/10.1007/s00231-020-02925-7

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