MezzoFluidics Impingement Architecture
MezzoFluidics’ Directed Nozzle-Jet-Impingement (DNJI) thermal management architecture is designed to maximize surface-to-coolant thermal coupling while minimizing system pressure drop and fluid handling complexity. Unlike conventional jet-plate or microchannel cold plate approaches, the MezzoFluidics architecture positions discrete nozzle-jet exit apertures extremely close to the heat-generating surface, enabling perpendicular impingement directly at localized hot spots. This proximity significantly reduces thermal boundary layer thickness at the point of heat transfer.
A defining architectural distinction is the managed exit-flow pathway. In jet-plate systems, high-velocity micro-jets (often tens to hundreds of microns in diameter) require sufficient standoff distance to allow spent coolant to traverse laterally across active jet columns before exiting the device. This lateral cross-flow can entrain warmer exit fluid into incoming jets, reducing effective thermal gradients and increasing pressure loss. In contrast, MezzoFluidics employs nozzle-jet sidewalls and fixture channelizing surfaces that guide exiting coolant vertically upward by the exterior sidewalls of the nozzle-jets impingement zone, and then laterally toward the cooling fluid exit apertures there by, significantly reducing or totally eliminating any interaction between adjacent nozzle-jet-impingement columns of warmed exiting fluid.
Hydraulically, the MezzoFluidics fixture is engineered for low system backpressure. Configurations supporting dual outlet ports—or a single outlet port with approximately twice the cross-sectional area of the inlet—reduce pressure accumulation within the fixture. Lower operating pressure decreases mechanical stress on seals and connections, reduces leak risk, and allows operation at substantially lower pump head requirements.
Additional pressure reduction is achieved through the use of larger nozzle-jet apertures (e.g., ~0.0625 inches / ~1,587 microns), compared with jet-plate apertures typically on the order of tens to hundreds of microns in diameter. Larger apertures reduce sensitivity to particulate contamination, lowering or eliminating the need for aggressive filtration. By contrast, micro-scale jet plates require fine filtration that increases system pressure drop and pump energy consumption.
The architecture further supports variable nozzle heights, aperture diameters, and end-face geometries, allowing localized optimization for non-uniform heat flux, package topography, such as Multi-Chip-Modules (MCMs), 2.5 and 3D chip and chiplit stacking to further enhance GPU performance with High Bandwidth Memory (HBMXX) and integration to GPU packages, and emerging "silicon" designs.
When combined with MezzoFluidics specialized sealing gasket system, the thermal management fixtures can be adapted for retrofit deployment on existing hardware platforms, extending operational life without major mechanical redesign and take advantage of the lower pump pressures and flow rates.
The primary function of MezzoFluidics specialty sealant gasket is to isolate and protect components on a delided GPU/MPU and allow cooling fluid to directly impinge on the GPU/MPU. The low pressure feature of the thermal management fixture in conjunction with the specialty sealant gasket is to minimize any physical damage to the onboard components and erosion of protective coatings such as praline. The nozzle-jet-impingement method, in certain cases, performs best when it can operate in the "Transition Region", between laminar flow and turbulent flow to minimize mechanical or chemical erosion. Another benefit from the design of the MezzoFluidics thermal management system is current thermal demands up to 5,000 watts (extrapolated) can be manufactured with standard plastic materials, hybrid materials and designs using common manufacturing processes like injection molding to economically produce 100K to 200K assemblies per month with 2 months notice. (Discussions with injection molding manufacturer)
From a system perspective, lower operating pressure directly benefits Coolant Distribution Unit (CDU) efficiency and longevity, reducing pump wear and energy consumption in platforms supplied by manufacturers such as Vertiv, Schneider Electric, CoolIT Systems, Asetek, and Motivair.
Collectively, these features position Directed Nozzle-Jet-Impingement as a low-pressure, high-coupling thermal management architecture distinct from conventional cold plates, microchannels, and high-pressure jet-plate systems.