Alternate PCM with air cavities in LED heat sink for transient thermal management
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 13 June 2019
Issue publication date: 17 October 2019
Abstract
Purpose
The purpose of this paper is to optimize the configuration of a heat sink with phase change material for improving the cooling performance of light emitting diodes (LED).
Design/methodology/approach
A numerical three-dimensional time-dependent model is developed with COMSOL Multiphysics to simulate the phase change material melting process during both the charging and discharging period.
Findings
The model is validated with previously published works. It found a good agreement. The difference between filled cavities with phase change materials (PCM) and alternate cavities air-PCM is discussed. The last-mentioned showed a good ability for reducing the junction temperature during the melting time. Three cases of this configuration having the same total volume of PCM but a different number of cavities are compared. The case of ten fins with five PCM cavities is preferred because it permit a reduction of 21 per cent of the junction temperature with an enhancement ratio of 2:4. The performance of this case under different power input is verified.
Originality/value
The use of alternate air-PCM cavities of the heat sink. The use of PCM in LED to delay the peak temperature in the case of thermal shock (for example, damage of fan) An amount of energy is stored in the LED and it is evacuated to the ambient of the accommodation by the cycle of charging and discharging established (1,765 Joule stored and released each 13 min with 1 LED chip of 5 W).
Keywords
Citation
Ben Salah, S. and Ben Hamida, M.B. (2019), "Alternate PCM with air cavities in LED heat sink for transient thermal management", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 11, pp. 4377-4393. https://doi.org/10.1108/HFF-02-2019-0099
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited