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Experimental investigations of fluid flow and heat transfer characteristics of a slot jet impinging on a square cylinder

Experimentelle Untersuchung der Strömungs- und Wärmeübergangscharakteristik bei Schlitzdüsenanblasung eines quadratischen Zylinders

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Abstract

Experimental investigations on pressure distributions and average heat transfer on square cylinders due to slot jet impingement have been carried out for different parameters such as, slot jet-width, distance of the square cylinder from the nozzle exit, angle of inclination of the cylinder to the jet axis and Reynolds numbers. The minimum value of the pressure coefficient is obtained on the lower face at an angle of inclination of 15° for all distances of the square cylinder from the nozzle exit. At the lowest Reynolds number the maximum average heat transfer rate is obtained at a distance of eight times the jet width from the nozzle exit. An increasing trend of the heat transfer rate is observed for higher Reynolds numbers. The maximum value of the heat transfer rate is obtained between the angles of inclination of 15° and 30° of the square cylinder to the jet axis. A correlation for the average Nusselt number is proposed in terms of the relevant non-dimensional parameters.

Zusammenfassung

Druckverteilung und gemittelter Wärmeübergang bei Schlitzanblasung eines quadratischen Zylinders wurden experimentell für folgende Parameter untersucht: Schlitzbreite; Abstand Düsenmündung vom Zylinder; Neigungswinkel des Zylinders zur Strahlachse; Reynoldszahl. Den Minimalwert des Druckkoeffizienten erhält man für alle Abstände an der Unterseite (bei einem Neigungswinkel von 15°). Bei der niedrigsten Reynoldszahl tritt der höchste Wert des gemittelten Wärmestroms in einem Abstand Düsenmündung/Zylinder von 8 Strahlbreiten auf. Mit steigender Reynoldszahl nimmt der Wärmestrom zu. Dessen höchster Wert tritt im Bereich 15 bis 30° des Neigungswinkels zwischen Zylinder und Strahlachse auf. Eine die Meßwerte korrelierende Nusscltbeziehung als Funktion dimensionsloser Parameter wird angegeben.

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Abbreviations

A :

surface area of the square cylinder

a :

width of the square cylinder

C p :

pressure coefficient=(p−p a )/\(\left( {\tfrac{1}{2}\varrho _a u_j^2 } \right)\)

C pb :

base pressure coefficient=(p b −p a )/\(\left( {\tfrac{1}{2}\varrho _a u_j^2 } \right)\)

h f :

free convection heat transfer coefficient

\(\bar h\) :

average heat transfer coefficient

k :

thermal conductivity of air

L :

distance of the axis of the square cylinder from the nozzle exit

l :

length of the square cylinder

Pr :

Prandtl number

p :

static pressure

p a :

atmospheric pressure

p b :

base pressure on the rear face

Nu f :

free convection Nusselt number

\(\overline {Nu} \) :

average Nusselt number

q :

heat loss

q f :

heat loss due to free convection

Re :

Reynolds number=u j W/v a

T a :

ambient air temperature

\(\bar T\) :

average surface temperature

u j :

average jet velocity at the nozzle exit

W :

nozzle width

α :

angle of inclination of the square cylinder to the jet axis in degrees

ν a :

kinematic viscosity of air

ϱ a :

density of air

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, 721302, Kharagpur, India

    R. K. Brahma

  2. Research Scholar from Bangladesh Chemical Industries Corporation, Dilkusha, Dhaka, Bangladesh

    A. Hossain

Authors
  1. A. Hossain
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  2. R. K. Brahma
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Hossain, A., Brahma, R.K. Experimental investigations of fluid flow and heat transfer characteristics of a slot jet impinging on a square cylinder. Wärme - und Stoffübertragung 28, 381–386 (1993). https://doi.org/10.1007/BF01577879

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  • DOI: https://doi.org/10.1007/BF01577879

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