Lorenzini, M., “ Performance Evaluation of a Wavy-Fin Heat Sink for Power Electronics” Applied Thermal Engineering, 2007.Ģ.
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The results show that the design of the fin field is still an issue and much remains to be investigated for optimization, depending on the conditions and application.įurther empirical testing is warranted for the evaluation of the effects of wavy fin heat sinks, as fine meshing and a high degree of confidence is not easily obtained through simulating these profiles using commercial CFD tools.ġ. The results presented in this article strengthen our understanding about how heat exchangers and heat sinks can be made more compact and efficient. Nusselt Number as a Function of Reynolds Number for Forced Convection-Vertical Direction. The data is for the fin type 11.44-3/8W.įigure 10. The results show that the experimental values of Shah and London are within 20% band of the values obtained from the above relations. In the graph, the Colburn j factor is shown and is defined as: The combined asymptotic for the friction and Nusselt number is as follows:įigure 3 compares the results of the above analytical equations with the results from Kays and London. Reynolds number based on hydraulic diameter
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The above equations are for the low Reynolds number.įor high Reynolds number Shapiro et. The Nusselt number for the straight fins and wavy fins is the same as long as the correct surface area is used: The same equation applies for a wavy fin based on the correct length: Shah and London came up with the following equation for the friction and Nusselt number in channels: The length of the curve can be found from the following equation: In this figure, the fins are assumed to have a sinusoidal geometry where The “waviness” can be adjusted to increase surface area resulting in a positive impact on thermal performance.įigure 2. This feature can easily be manufactured with a die. In general, a wavy fin heat sink should perform better under natural and forced convection due to the increased surface area created by the fins. One such effort is the design of the wavy fins to enhance the surface area.įigure 1 shows a close up view of an extrusion type thermal solution where the profile has a feature of undulated fins. Finned heat sinks and heat exchangers are largely employed in many engineering fields, and this demand spurs researchers into devising and testing new geometries for the heat sinks.Įngineers constantly try to develop new designs to enhance the performance of heat exchangers. As products are refined through the design cycle, thermal solutions may have to be optimized and this requires many investigations to be undertaken.Īs the electronics industry continues to use components dissipating more and more power, new heat sink solutions must be able to accommodate large heat fluxes while keeping the same spatial dimensions. Many leading companies design their products by using technologies that will sustain long product life cycles for increased market share and brand awareness. Thermal solutions become the gatekeeper, and in some cases, the determining factor in product deployment. This is because, in most cases, the form factor, layout, boundary conditions, etc. If adequate margin is not met, reliability implications are more apparent as engineers will have to optimize solutions.
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and migrate (as expected) to the lower cost “standard solutions” whenever possible. TM’s design thermal solutions based on airflow, envelope size, power dissipation, etc. Closeup of fin array on an ATS tube-to-fin heat exchanger.