NUS Enterprise

Integrated Flow Header for the Planar Heat Sink with Transverse and Oblique Channels

Technology #2017-149

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Poh Seng LEE
Omer Bugra KANARGI
Managed By
Mr Ma Mun Thoh (
Senior Associate Director (65)65166506
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Tech Offer [PDF]

Industry Problem

Thermal and hydraulic performances of a multichannel heat sink depend on how uniform the flow is distributed tothe channels. Flow is to be properly manifolded at the heat sink inlet to ensure a uniform distribution. For theconventional straight channel heat sink, a good manifold is supposed to deliver flow to each and every one of thechannels at equal rates. However, enhanced fin designs alter the flow field by inducing unusual flow phenomena,in some extreme cases, triggering maldistribution/migration of the flow through the heat sink. The planar heatsink with transverse and oblique channels provides remarkable improvement in the heat transfer performance,while at the same time it suffers from severe flow migration, especially at high flow rates.


NUS researchers designed and implemented a novel inlet and outlet flow header for the planar heat sink withtransverse and oblique channels (a.k.a. the oblique-finned heat sink in the literature). Even if the incoming flow isperfectly uniform at the inlet of the flow domain, the flow migration induced by the oblique channels result in aflow drainage near “the draining edge” and a flow accumulation near “the filling edge”. The resultingmaldistribution of the flow compromises the thermal-hydraulic performance. The proposed flow header results ina more favorable distribution of flow through the planar oblique-finned heat sink, improving the thermal and/orhydraulic performances. The proposed solution can be implemented to planar oblique-finned heat sinks inmacro/mini/micro dimensions for air or liquid cooling applications.


Value Proposition

 Simple modification of the flow domain of the planar heat sink with transverse and oblique channels

 Applicable to air or liquid cooling in macro/micro dimensions

 Maintain lower heat sink temperature

 Improve temperature uniformity of the heat sink

 Decrease pressure drop penalty of the flow