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A comparative study of the local heat transfer distributions around various surface mounted obstacles

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Abstract

In many engineering applications, heat transfer enhancement techniques are of vital importance in order to ensure reliable thermal designs of convective heat transfer applications. This study examines experimentally the heat transfer characteristics on the base plate around various surface mounted obstacles. Local convection coefficients are evaluated in the vicinity of each individual protruding body with great spatial resolution using the transient liquid crystal technique. Five different obstacles of constant height-to-hydraulic diameter ratio (∼1.3) are considered. These include: a cylinder, a square, a triangle, a diamond and a vortex generator of delta wing shape design. The experiments were carried out over a range of freestream Reynolds numbers, based on the hydraulic diameter of each obstacle, varying from 4,000 to 13,000. The results indicate a negligible effect of the flow speed on the heat transfer topological structure and a considerable effect of the obstacle geometry on the level and distribution of heat transfer enhancement.

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Abbreviations

c J/(kg K):

specific heat

d m:

hydraulic diameter

h W/(m2 K):

heat transfer coefficient

H m:

obstacle height

k W/(m K):

thermal conductivity

Re —:

Reynolds number

t s:

time

T K:

temperature

U m/s:

velocity

VG :

vortex generator

x,y,z :

coordinate system

a m:

obstacle side

ρ kg/m3 :

density

µ kg/(m s):

dynamic viscosity

i :

initial conditions

∞:

freestream conditions

g :

hot gas conditions

LC:

liquid crystals

ref:

flat plate (no obstacle)

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Authors and Affiliations

  1. Group of Thermal Turbomachinery (GTT), École Polytechnique Fédérale de Lausanne (EPFL) SCI-STI-PO, CH-1015, Lausanne, Switzerland

    Robert Wyssmann, Dirk Ullmer, Alexandros Terzis & Peter Ott

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  1. Robert Wyssmann
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  2. Dirk Ullmer
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  3. Alexandros Terzis
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  4. Peter Ott
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Wyssmann, R., Ullmer, D., Terzis, A. et al. A comparative study of the local heat transfer distributions around various surface mounted obstacles. J. Therm. Sci. 23, 169–176 (2014). https://doi.org/10.1007/s11630-014-0692-8

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  • DOI: https://doi.org/10.1007/s11630-014-0692-8

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