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Impingement heat transfer from wedge surface

Wärmeübertragung einer Strömung, die auf einen Keil aufprallt

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Abstract

An experimental investigation is made to study the heat transfer characteristics of slot jet impingement on a wedge whose included angle is 90°. Local and average heat transfer rates from the wedge surfaces have been measured. The experiments have been conducted with isothermal wedge surface at Reynolds numbers ranging from 5 680 to 16 600. The effects of varying the flow rate, width of the nozzle, distance of the wedge vertex from the nozzle exit, eccentricity of the wedge vertex to the jet axis on the flow properties of the fluid have been investigated. A correlation has been proposed considering the relevant dimensionless parameters and then compared with experimental data.

Zusammenfassung

Ein experimenteller Versuch wurde durchgeführt, um die Wärmeübertragungseigenschaften bei der Spaltung eines Strahls, die beim Aufprall auf einen rechtwinkligen Keil entsteht, zu untersuchen. Gemessen wurde die lokale und mittlere Wärmeübertragungsrate der Keiloberfläche. Dieses Experiment wurde mit einer isothermen Keiloberfläche bei einer Reynolds-Zahl zwischen 5 680–16 600 durchgeführt. Untersucht wurden die Einwirkungen bei der Änderung der Strömungsrate, Düsenbreite, Abstand zwischen Keilscheitel und Düsenausgang, Exzentrizität von Keilscheitel und Strahlachse, sowie die Strömungseigenschaften des Fluids. Unter Betracht der maßgebenden dimensionslosen Parameter wurden Berechnungen durchgeführt und diese mit den experimentellen Daten verglichen.

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Abbreviations

A :

surface area of the wedge

B :

breadth of the wedge or nozzle

C :

face length of the wedge

c p :

specific heat at constant pressure

Gr C :

Grashof number

H :

height of the wedge=C sinφ

h :

local heat transfer coefficient

\(\bar h\) :

average heat transfer coefficient

h f :

free convective heat transfer coefficient

K :

thermal conductivity

L :

distance from the nozzle exit to the wedge vertex

Nu f :

free convection Nusselt number

Nu W :

local Nusselt number=hW/K

\(\overline {Nu} _w\) :

average Nusselt number=\(\bar h\) W/K

Pr :

Prandtl number=μc p /K

q :

heat loss due to forced convection

q i :

heat input

q f :

heat loss due to free convection

q L :

heat loss due to conduction and radiation

Re W :

Reynolds number=u j W/ν a

\(\overline T\) :

average temperature in °C

T j :

jet temperature in °C

T a :

ambient air temperature in °C

T m :

mean temperature=(\(\overline T\)+T a )/2

u :

mean velocity in m/s

u j :

average jet exit velocity in m/s

W :

nozzle width

x :

distance measured from wedge vertex

φ :

angle between upper surface of the wedge and jet center line

φ′ :

angle between lower surface of the wedge and jet center line

ε :

eccentricity of the wedge vertex with the jet center line

μ :

absolute viscosity

ν :

kinematic viscosity

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Authors and Affiliations

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

    R. K. Brahma & R. C. Arora

  2. Bangladesh Institute of Technology, Chittagong, Bangladesh

    O. Faruque

Authors
  1. O. Faruque
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  2. R. K. Brahma
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  3. R. C. Arora
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Faruque, O., Brahma, R.K. & Arora, R.C. Impingement heat transfer from wedge surface. Wärme - Und Stoffübertragung 26, 175–179 (1991). https://doi.org/10.1007/BF01590118

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