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As heat transfer is directly correlated with surface area, adding surface area within the fluid path of a liquid cold plate can increase how much heat transfers into the liquid. Liquid cold plates customized with extended surfaces also benefit from additional turbulence, further improving heat transfer. Increasing turbulence is especially important for low flow rates or high viscosity fluids like oil.

Extended surfaces can be added to high heat flux areas of the liquid cold plate or added to the entirety of the flow path, depending on pressure drop and flow rate requirements. By balancing the additional pressure drop from extended surfaces with flow rate, Aavid engineers can drastically increase the performance of a liquid cold plate in its existing volume. Aavid offers many options for liquid cold plate improvement, but folded fin inserts, skived fin inserts, and wire turbulators are the most common and cost-effective ways to improve cold plate performance.

Construction Methods
• Controlled Atmosphere Brazing (CAB)
• Vacuum Braze
• Soldered
• 环氧树脂
• Press Fit

Folded fin inserts are a common addition to machined and brazed liquid cold plates. Brazing or soldering the folded fin inserts into the plate mechanically and thermally joins the additional surface area to both the top and bottom of the flow path. Folded fins come in a variety of forms like louvered, wavy or ruffled, round or flat crested, however lanced offset folded fins are the most popular. Lanced offset folded fins have the additional benefit of increased turbulence and heat transfer compared to other folded fin types. Each type can be manufactured with a wide range of materials for optimized performance and liquid & fluid compatibility.

Skived fin inserts are skived fin heat sinks specifically designed for use in your chosen fluid, which usually means thinner fins and a higher fin density. Skived fin heat sinks can either be dropped into a machined flow path or the cold plate can have a machined opening where the insert can directly contact the heat source and fluid without introducing an interface resistance of solder or epoxy.

Tube style cold plates can benefit from the installation of turbulator inserts, which are intricate wire assemblies designed to increase liquid turbulence within the flow path. Liquid cold plates utilizing higher viscosity fluids benefit the most from wire turbulators as performance increases between 5-15% over an empty flow path.

Depending on the wire density and gauge, turbulator impact can be matched with your specific requirements for liquid cold plate performance.

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