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Heat transfer and flow visualization of swirling impinging jet on flat surface using helicoid inserts

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Abstract

The heat transfer and flow structure of swirling impinging jet on a flat surface with helicoid inserts are experimentally and numerically analyzed. The study is focused on flow dynamics intended to describe the influence of swirl on the mechanics of impingement by varying the number of helicoid surfaces named as single, double, and triple helicoid inserts. A helicoid surface may be considered as having an infinite number of adjacent helical curves that rotates symmetrically about Z axis. The thermochromic liquid sheet and oil film technique are used to visualize the heat transfer characteristics and flow structure on the impinging surface, respectively. The numerical analysis is carried out for Swirl number Sw = 0.75 and Reynolds number value of 23,000 and for jet exit to impinging surface distance of H/D = 1, 2, 3, 4 using CFD. The flow characteristics of swirling jet are also compared with circular impinging jet. The flow characteristics are presented in terms of axial velocity variation and the distribution of vorticity and velocity vectors are also visualized. In addition turbulent statistics are also presented. The axial component of velocity of jet leaving triple helicoid at the stagnation region is relatively lower than single and double helicoids due to the presence of axial recirculation zones and the tangential velocity component of triple helicoid is higher in the region which corresponds to radial distance r/D = 0–0.4, 0–0.8, and 0–1.4 at H/D = 1, 2, and 3, respectively, compared with single and double helicoids. The axial velocity component exhibits flat profile for the single and double helicoids at increased H/D distances (H/D = 4). The vorticity distribution is relatively more intense for triple helicoid at the downstream of jet near the wall jet region causing it to entrain more ambient air compared with single and double helicoids.

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Abbreviations

A :

Area of stainless steel foil, m2

D :

Inner diameter of jet exit pipe (outer diameter of vane), m

\(d\) :

Vane hub diameter, m

H :

Jet exit to impinging surface distance, m

H/D :

Dimensionless distance of jet exit to impinging surface

h :

Convective heat transfer coefficient, W/m2 K

k air :

Thermal conductivity of air, W/m K

Nu :

Nusselt number, dimensionless = \(\frac{h D}{{ k_{\text{air}} }}\)

Re :

Reynolds number, dimensionless = \(\frac{{U_{0} D}}{\gamma }\)

r :

Radial distance on the impinging surface, m

r/D :

Dimensionless radial distance on the impinging surface

Sw :

Swirl number, Dimensionless = \(\frac{2}{3}\left[ {\frac{{1 - \left( {\frac{d}{D}} \right)^{3} }}{{1 - \left( {\frac{d}{D}} \right)^{2} }}} \right]\tan \theta\)

Sh:

Single helicoid

Dh:

Double helicoid

Th:

Triple helicoid

\(T_{s}\) :

Local impinging surface temperature, K

\(T_{\text{j}}\) :

Jet exit temperature, K

ur’:

Root mean square of radial velocity fluctuations, m/s

\(U_{0}\) :

Mean velocity of air in the smooth pipe, m/s

γ :

Kinematic viscosity of air, m2/s

θ :

Helicoid vane angle, degrees

\(\sigma\) :

Standard deviation of Nusselt number over the impinging surface

\(\bar{\sigma }\) :

Normalized standard deviation

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Authors and Affiliations

  1. Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Kakinada, 533003, India

    S. Mohamed Illyas & V. Venkata Subba Rao

  2. Department of Mechanical Engineering, Chennai Institute of Technology, Chennai, 600069, India

    B. R. Ramesh Bapu

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  1. S. Mohamed Illyas
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Correspondence to S. Mohamed Illyas.

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Mohamed Illyas, S., Ramesh Bapu, B.R. & Venkata Subba Rao, V. Heat transfer and flow visualization of swirling impinging jet on flat surface using helicoid inserts. J Vis 21, 729–749 (2018). https://doi.org/10.1007/s12650-018-0493-3

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