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Thermal computations of temperature distribution and bulb heat transfer in an automobile headlamp

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Abstract

In this study, experimental and numerical analysis was performed to define thermal deformation inside the head lamp because of usage plastic materials and thermal loads. Buoyancy, radiation and conjugate effects were considered. Velocity and temperature distributions were obtained and possible hot points and condense regions can be determined. Nusselt number distribution on cylindrical bulb were computed and compared with literature. Relatively important heat transfer increase in natural convection was found.

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Abbreviations

c0 (m/s):

Speed of light in vacuum

β (1/K):

Thermal expansion

D (m):

Diameter

g (m/s2):

Gravitational acceleration

h (J s):

Planck’s constant

H (J):

Enthalpy

Iλb [W/(m2 nm)]:

Spectral hemispherical blackbody intensity

Iλ [W/(m2 nm sr)]:

Spectral radiation intensity

K (J/K):

Boltzmann constant

k [W/(m K)]:

Thermal conductivity

P (Pa):

Pressure

q (W/m2):

Radiative flux vector

S:

Position vector

T (K):

Temperature, thermocouple

u (m/s):

Velocity vector

α (1/m):

Absorptivity

λ (m):

Wavelength

ν (m2/s):

Kinematic viscosity

ρ (kg/m3):

Density

τ (N/m2):

Stress tensor

ω (sr):

Solid angle

b:

Blackbody

buoy:

Buoyancy

rad:

Radiative

ref:

Reference

λ:

Spectral

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Acknowledgments

This study was supported by the Turkish Ministry of Science, Industry and Technology under the grant of SAN-TEZ project numbered as 00521STZ.2010-1. The authors gratefully acknowledge the Ministry for this support.

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Authors and Affiliations

  1. Magnetti Marelli Mako Electrical Industry and Trade Company, Organized Industrial Zone, Yesil Street No: 28, 16159, Nilufer, Bursa, Turkey

    K. Furkan Sokmen

  2. Mechanical Engineering Department, Institute of Natural Sciences, Uludag University, Gorukle Campus, 16059, Bursa, Turkey

    K. Furkan Sokmen

  3. Mechanical Engineering Department, Faculty of Engineering and Architecture, Uludag University, Gorukle Campus, 16059, Bursa, Turkey

    Erhan Pulat

  4. Air-Conditioning and Refrigeration Program, Electrical and Energy Department, Vocational School of Technical Sciences, Uludag University, Gorukle Campus, 16059, Bursa, Turkey

    Nurettin Yamankaradeniz & Salih Coskun

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  1. K. Furkan Sokmen
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  2. Erhan Pulat
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  3. Nurettin Yamankaradeniz
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  4. Salih Coskun
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Correspondence to Erhan Pulat.

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Sokmen, K.F., Pulat, E., Yamankaradeniz, N. et al. Thermal computations of temperature distribution and bulb heat transfer in an automobile headlamp. Heat Mass Transfer 50, 199–210 (2014). https://doi.org/10.1007/s00231-013-1229-5

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