Two-phase flow morphology and local wall temperatures in high-aspect-ratio manifold microchannels

Abstract

Manifold microchannel heat sinks can dissipate high heat fluxes at moderate pressure drops, especially during two-phase operation. High-aspect-ratio microchannels afford a large enhancement in heat transfer area; however, the flow morphology in manifold microchannels during two-phase operation, as well as the resulting thermal performance, are not well understood. In this work, a single manifold microchannel representing a repeating unit in a heat sink is fabricated in silicon with a bonded glass viewing window. Samples of different channel lengths (750 μm and 1500 μm) and depths (125 μm, 250 μm, and 1000 μm) are considered; channel and fin widths are both maintained at 60 μm. Subcooled fluid (HFE-7100) is delivered to the channel at a constant flow rate such that the fluid velocity at the inlet is ~1.05 m/s in all cases. A highspeed camera is used to visualize the two-phase flow in the channel through the glass sidewall; an infrared camera measures the temperature distribution on the opposite channel sidewall. The flow

Phase inversion in liquid phase for air-liquid horizontal flow

“…It goes without saying that more studies are needed so that a better knowledge of phase inversion can be gained. Recently most of the work focussed on the novel detection or physical challenges of pure phases (Agarwal & Dondapati, 2020;Drummond et al, 2020;Li et al, 2020;O'Donovan & Grimes, 2020;Rafałko et al, 2020;Shi et al, 2020) but no research were done on dispersed or emulsified phases.…”

Experimental study on the flow and heat transfer characteristics of pin-fin manifold microchannel heat sink

“…The results show that the manifold structure improves the performance of the single-phase flow rectangular microchannel radiator. Drummond et al [5][6][7] designed and manufactured a silicon-based rectangular manifold microchannel radiator. The microchannel and manifold dividing plate were etched on silicon wafers respectively and bonded together, and a heating circuit simulating electronic chip heating was integrated into the other side of the silicon-based manifold microchannel.…”

Numerical Investigation of Geometric Parameters Effects on Heat Transfer Enhancement in a Manifold Microchannel Heat Sink

“…Their result showed that compared to the usual MMHS, the best heat sink could decrease thermal resistance by 19.15% and reduce pressure drop by 1.91% at Re = 295. Drummond et al [27] experimentally studied two-phase flow morphology in high aspect ratio manifold microchannels. Their results showed that for manifold microchannels, the two-phase flow regime plays an important role in heat transfer improvement and must be with accuracy considered in heat sink design.…”