Main Article Content

Matjaz RAMŠAK Matej ZADRAVEC Jure Ravnik Matjaž Hriberšek Jernej Slanovec


Efficiency of cooling fins inside of a LED fog lamp is studied using CFD. Diffusion in heat sink, natural convection and radiation are the main principles of the simulated heat transfer. The Navier-Stokes equations were solved by the CFD code, including Monte Carlo radiation model and no additional turbulence model was needed. The numerical simulation is tested using the existing lamp geometry and temperature measurements. The agreement is excellent inside of few degrees at all measured points. The main objective of the article is to determine the cooling effect of various heat sink parts. Based on performed simulations, some heat sink parts are found to be very ineffective. The geometry and heat sink modifications are proposed.

While radiation influence is significant, compressible effects are found to be minor.

Article Details

How to Cite
RAMŠAK, Matjaz et al. COOLING ANALYSIS OF A LED AUTOMOTIVE FOG LAMP. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <>. Date accessed: 14 dec. 2017. doi:
Received 2017-03-03
Accepted 2017-03-13
Published 2017-03-13


[1] H. Baumgartner, A. Vaskuri, P. Karha, E. Ikonen, A temperature controller for high power light emitting diodes based on resistive heating and liquid cooling, Applied Thermal Engineering 71 (2014) 317 – 323.
[2] H. Chih-Neng, C. Yu-Hao, L. Chang-Yuan, F. Shih-Hao, H. Chun-Chieh, Heat transfer and structure stress analysis of micro packaging component of high power light emitting diode, Thermal Science 17 (2013) 1277–1283.
[3] C. Introini, M. Quintard, F. Duval, Effective surface modeling for momentum and heat transfer over rough surfaces: Application to a natural convection problem, International Journal of Heat and Mass Transfer 54 (2011) 3622 – 3641.
[4] G. De Vahl Davis, Natural convection of air in a square cavity: A bench mark numerical solution, International Journal for Numerical Methods in Fluids 3 (1983) 249–264.
[5] S. S. Anandan, V. Ramalingam, Thermal management of electronics: A review of literature, Thermal Science 12 (2008) 5–26.
[6] C. Tso, F. Tan, J. Jony, Transient and cyclic effects on a pcm-cooled mobile device, Thermal Science Online-First Issue 00 (2013) 112–112.
[7] A. Christensen, S. Graham, Thermal effects in packaging high power light emitting diode arrays, Applied Thermal Engineering 29 (23) (2009) 364 – 371.
[8] J. Sousa, J. Vogado, M. Costa, H. Bensler, C. Freek, D. Heath, An experimental investigation of fluid flow and wall temperature distributions in an automotive headlight, International Journal of Heat and Fluid Flow 26 (2005) 709 – 721.
[9] J. Wang, Y. Cai, X. Zhao, C. Zhang, Thermal design and simulation of automotive headlamps using white leds, Microelectronics Journal 45 (2014) 249 – 255.
[10] C. Mielke, S. Senin, A. Wenzel, C. Horn, J. Scheuchenpflug, Simulation of the temperature distribution in automotive head lamps, NAFEMS International Journal of CFD case studies 9 (2011) 23–32.
[11] Ansys CFX 15.0: Solver Theory Guide, 2014.