{"id":18471,"date":"2018-12-19T11:29:55","date_gmt":"2018-12-19T11:29:55","guid":{"rendered":"https:\/\/www.simscale.com\/?page_id=18471"},"modified":"2021-03-22T21:45:07","modified_gmt":"2021-03-22T21:45:07","slug":"thermal-effects-in-high-power-led-packaging","status":"publish","type":"page","link":"https:\/\/www.simscale.com\/docs\/validation-cases\/thermal-effects-in-high-power-led-packaging\/","title":{"rendered":"Validation Case: Thermal Effects in High Power LED Packaging"},"content":{"rendered":"\n\n\n\n<p class=\"wp-block-paragraph\">This <a href=\"https:\/\/www.simscale.com\/blog\/2020\/08\/led-cooling\/\"  rel=\" noopener\">LED cooling<\/a> validation case, for high power LED packaging with one heat sink, aims of to validate the following parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Heat transfer solver<\/li><li>Multiple materials and contact heat transfer<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The simulation results of SimScale were compared to the theoretical results presented in [Adam]\\(^1\\). <\/p>\n\n\n\n<div class=\"hw-block hw-btnWrapper hw-btnWrapper--alignCenter \">\n    <a href=\"https:\/\/www.simscale.com\/workbench\/?pid=2724408049379156449&#038;mi=spec%3Ae560dbcb-d543-4e0c-acb3-7bd52f34cab0%2Cservice%3ASIMULATION%2Cstrategy%3A34\" class=\"hw-btn    \" rel=\"noopener \" target=\"_blank\"    >\n        View Project    <\/a>\n<\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"geometry\" >Geometry<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The typical geometry used for the case is as follows: <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-106.png\"><img loading=\"lazy\" decoding=\"async\" width=\"971\" height=\"741\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-106.png\" alt=\"geometry model validation case thermal high power led packaging\" class=\"wp-image-32017\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-106.png 971w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-106-300x229.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-106-768x586.png 768w\" sizes=\"auto, (max-width: 971px) 100vw, 971px\" \/><\/a><figcaption>Figure 1. Main dimensions of the quarter model of the heat sink, with shown gap of 10 mm.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">It represents a heat sink of dimensions 100 x 100 \\(mm\\) with 25 LEDs attached through Thermal Interface Material (TIM) patches of dimensions 7 x 7 x 0.1 \\(mm\\). <strong>Only one-quarter of the geometry is modeled to leverage the symmetry<\/strong>. Gaps of 10, 5, and 1 \\(mm\\) between LEDs were tested, with each model shown below for comparison:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"257\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-1024x257.png\" alt=\"geometry variations validation case thermal high power led packaging\" class=\"wp-image-32018\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-1024x257.png 1024w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-300x75.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-768x193.png 768w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-1536x385.png 1536w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-107-2048x514.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption>Figure 2. Models with gaps between LEDs of 10, 5, and 1 mm (left to right).<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"analysis-type-and-mesh\" >Analysis Type and Mesh<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tool Type<\/strong>: Code Aster<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Analysis Type<\/strong>: Heat transfer, linear, steady-state.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Mesh and Element Types<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-table aligncenter is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Case<\/th><th class=\"has-text-align-center\" data-align=\"center\">Gap <br>\\([mm]\\)<\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Mesh Type<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Number of <\/strong><br><strong>Nodes<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Element Type<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">A<\/td><td class=\"has-text-align-center\" data-align=\"center\">10<\/td><td class=\"has-text-align-center\" data-align=\"center\">1st order tetrahedral<\/td><td class=\"has-text-align-center\" data-align=\"center\">828917<\/td><td class=\"has-text-align-center\" data-align=\"center\">Standard<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">B<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><td class=\"has-text-align-center\" data-align=\"center\">1st order tetrahedral<\/td><td class=\"has-text-align-center\" data-align=\"center\">824569<\/td><td class=\"has-text-align-center\" data-align=\"center\">Standard<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">C<\/td><td class=\"has-text-align-center\" data-align=\"center\">1<\/td><td class=\"has-text-align-center\" data-align=\"center\">1st order tetrahedral<\/td><td class=\"has-text-align-center\" data-align=\"center\">824369<\/td><td class=\"has-text-align-center\" data-align=\"center\">Standard<\/td><\/tr><\/tbody><\/table><figcaption>Table 1. Mesh details.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The meshes were computed using the Tet-dominant algorithm with manual mesh sizing and local refinements for the TIM regions. The goal was to keep 2 elements across the thickness of the thin-walled parts, like the heat sink fins and TIM patches.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"739\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108-1024x739.png\" alt=\"tetrahedral mesh validation case thermal high power led packaging\" class=\"wp-image-32019\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108-1024x739.png 1024w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108-300x217.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108-768x554.png 768w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-108.png 1222w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption>Figure 3. Typical tetrahedral mesh for 5 \\(mm\\) gap model.<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-109.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"666\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-109-1024x666.png\" alt=\"tetrahedral mesh detail validation case thermal high power led packaging\" class=\"wp-image-32020\"\/><\/a><figcaption>Figure 4. Typical mesh refinement showing local details of the tetrahedral elements on a TIM body.<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"packaging\" >LED Performace<\/a> Packaging<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Material<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Aluminum Heat Sink:<ul><li>Density \\( \\rho = \\) 2700 \\( kg\/m^3 \\)<\/li><\/ul><ul><li>Thermal conductivity \\( \\kappa&nbsp;= \\) 202.40 \\( W\/(mK) \\)<\/li><li>Specific heat \\(C_p = \\) 897 \\( J\/(kgK) \\)<\/li><\/ul><\/li><li>TIM (Thermal Interface Material):<ul><li>Density \\( \\rho = \\) 7870 \\( kg\/m^3 \\)<\/li><li>Thermal conductivity \\( \\kappa&nbsp;= \\) 0.22 \\( W\/(mK) \\)<\/li><li>Specific heat \\(C_p = \\) 480 \\( J\/(kgK) \\)<\/li><\/ul><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The thermal conductivity of the TIM was computed to achieve a total resistance of 9 \\(K\/W\\), according to [INFINEON]\\(^2\\) with the relation:<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">$$ \\kappa = \\frac{t}{RA} $$<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\\(\\kappa\\) is the conductivity, \\( W\/(mK) \\)<\/li><li>\\(t\\) is the thickness of the body, 0.1e-3 \\(m\\)<\/li><li>\\(R\\) is the thermal resistance, 9 \\(K\/W\\)<\/li><li>\\(A\\) is the cross-sectional area, 4.9e-5 \\(m^2\\)<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Boundary Conditions<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Heat Flux Load:<ul><li>Surface heat fluxes of 1, 3, and 5 \\(W\\) per LED applied to the top surfaces of TIM bodies.<\/li><\/ul><\/li><li>Convective Heat Flux:<ul><li>Convective heat fluxes with heat transfer coefficients of 10, 25, 50, 75, and 100  \\(W\/(m^2K)\\) with reference temperature of 300.15 \\(K\\) on all heat sink faces except the contact patches with TIM bodies and symmetry planes.<\/li><\/ul><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The following table relates the simulation runs for each case and the combinations of applied boundary conditions:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Run<\/th><th class=\"has-text-align-center\" data-align=\"center\">Load<br>1 \\([W]\\)<\/th><th class=\"has-text-align-center\" data-align=\"center\">Load<br>3 <strong>\\([W]\\)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\">Load<br>5 <strong>\\([W]\\)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\">Convective flux<br>10 \\([\\frac{W}{m^2K}]\\)<\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Convective flux<\/strong><br>25 <strong>\\([\\frac{W}{m^2K}]\\)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Convective flux<\/strong><br>50 <strong>\\([\\frac{W}{m^2K}]\\)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Convective flux<\/strong><br>75 <strong>\\([\\frac{W}{m^2K}]\\)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Convective flux<\/strong><br>100 <strong>\\([\\frac{W}{m^2K}]\\)<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">1<\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">2<\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">3<\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">4<\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">9<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">10<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">11<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">13<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">14<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\">X<\/td><\/tr><\/tbody><\/table><figcaption>Table 2. Simulation runs and their respective boundary conditions matrix.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reference-solution\" >Reference Solution<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The reference solution is of the analytical type, as presented in [ADAM]\\(^1\\). It is given in terms of the temperature at the center point as a function of the thermal load and convection coefficients.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"result-comparison-high-power-led-packaging\" >Result Comparison: High Power LED Packaging<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comparison of temperature at the mid point is shown for each case:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-111.png\"><img loading=\"lazy\" decoding=\"async\" width=\"914\" height=\"729\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-111.png\" alt=\"results comparison validation case thermal high power led packaging\" class=\"wp-image-32022\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-111.png 914w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-111-300x239.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-111-768x613.png 768w\" sizes=\"auto, (max-width: 914px) 100vw, 914px\" \/><\/a><figcaption>Figure 5. Results comparison for Case A.<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-112.png\"><img loading=\"lazy\" decoding=\"async\" width=\"878\" height=\"671\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-112.png\" alt=\"results comparison validation case thermal high power led packaging\" class=\"wp-image-32023\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-112.png 878w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-112-300x229.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-112-768x587.png 768w\" sizes=\"auto, (max-width: 878px) 100vw, 878px\" \/><\/a><figcaption>Figure 6. Results comparison for Case B<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-113.png\"><img loading=\"lazy\" decoding=\"async\" width=\"895\" height=\"707\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-113.png\" alt=\"results comparison validation case thermal high power led packaging\" class=\"wp-image-32024\" srcset=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-113.png 895w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-113-300x237.png 300w, https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-113-768x607.png 768w\" sizes=\"auto, (max-width: 895px) 100vw, 895px\" \/><\/a><figcaption>Figure 7. Results comparison for Case C <\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The deviation of the results with respect to [ADAM]\\(^1\\) in the cases of gap 5 mm and 1 mm can be attributed to a non-uniform temperature distribution at the base of the fins:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-114.png\"><img decoding=\"async\" src=\"https:\/\/frontend-assets.simscale.com\/media\/2020\/07\/image-114-1024x693.png\" alt=\"temperature plot validation case thermal high power led packaging\" class=\"wp-image-32025\"\/><\/a><figcaption>Figure 8. Temperature contour plot for Case C, Run 12: 1 mm gap, 5 W\/LED load and Convection coefficient of 50.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"related-tutorials\" >Related Tutorials<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.simscale.com\/docs\/tutorials\/thermal-analysis-differential-casing\/\">Tutorial: Thermal Analysis of a Differential Casing<\/a><\/p>\n\n\n\n\n<div class='hw-block hw-references hw-references'>\n    <p class='hw-references__title'>References<\/p>\n    <ul class='hw-references__list'>\n\n        <li><cite>Christensen, Adam, and Samuel Graham. \u201cThermal effects in packaging high power light emitting diode arrays.\u201d Applied Thermal Engineering 29.2 (2009): 364-371.<\/cite><\/li><li><cite>\u201cThermal Resistance Theory and Practice \u2013 Infineon\u201d http:\/\/www.infineon.com\/dgdl\/smdpack.pdf?fileId=db3a304330f6860601311905ea1d4599<\/cite><\/li>\n    <\/ul>\n<\/div>\n\n\n\n<div class=\"hw-block hw-note hw-note--info hw-note\">\n    <div class=\"hw-note__title\">\n        <p class=\"hw-note__titleText\"><i class=\"fa fa-exclamation-circle\" aria-hidden=\"true\"><\/i>Note<\/p>\n    <\/div>\n    <div class=\"hw-note__body\">\n        <p>If you still encounter problems validating you simulation, then please post the issue on our <a href=\"https:\/\/www.simscale.com\/forum\/\">forum<\/a> or <a href=\"mailto:support@simscale.com\">contact us<\/a>.<\/p>\n    <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This LED cooling validation case, for high power LED packaging with one heat sink, aims of to validate the following...","protected":false},"author":94,"featured_media":0,"parent":17191,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/template-documentation.php","meta":{"_acf_changed":false,"_crdt_document":"","inline_featured_image":false,"footnotes":""},"class_list":["post-18471","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/pages\/18471","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/users\/94"}],"replies":[{"embeddable":true,"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/comments?post=18471"}],"version-history":[{"count":0,"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/pages\/18471\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/pages\/17191"}],"wp:attachment":[{"href":"https:\/\/www.simscale.com\/wp-json\/wp\/v2\/media?parent=18471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}