Multiphase parallel flow stabilization in curved microchannel

Kositanont, C.; Putivisutisak, Sompong; Tagawa, Tetsuya; Yamada, Hiroshi; Assabumrungrat, Suttichai

doi:10.1016/j.cej.2014.05.023

Cited by 9 publications

(2 citation statements)

References 33 publications

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“…For high heat flux thermal management, microscale cooling with liquids has become a promising alternative to traditional air cooling due to the liquids' larger heat capacity, thermal conductivity, and intrinsic ability to dissipate large amounts of thermal energy (heat)-or regulate fluctuations in surface temperaturevia liquid-vapor (latent heat) phase transformations. In result, there has been significant interest by academia and industry on convective and phase-change heat transfer at the micro-and nanoscale, where hundreds of papers have been published on related liquid cooling processes including (but not limited to) singlephase flow [9], multiphase flow [10,11], flow boiling [12], pool boiling [13,14], spray cooling [15,16], heat pipes [17,18], thermosyphons [19], microdroplet evaporation [20], single-phase jet impingement cooling [21,22], and microjet impingement boiling [23,24].…”

Section: Introductionmentioning

confidence: 99%

Probing the Local Heat Transfer Coefficient of Water-Cooled Microchannels Using Time-Domain Thermoreflectance

Mehrvand

Putnam

2017

Journal of Heat Transfer

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The demands for increasingly smaller, more capable, and higher power density technologies have heightened the need for new methods to manage and characterize extreme heat fluxes. This work presents the use of an anisotropic version of the time-domain thermoreflectance (TDTR) technique to characterize the local heat transfer coefficient (HTC) of a water-cooled rectangular microchannel in a combined hot-spot heating and subcooled channel-flow configuration. Studies focused on room temperature, single-phase, degassed water flowing at an average velocity of ≈3.5 m/s in a ≈480 μm hydraulic diameter microchannel (e.g., Re ≈ 1850), where the TDTR pump heating laser induces a local heat flux of ≈900 W/cm2 in the center of the microchannel with a hot-spot area of ≈250 μm2. By using a differential TDTR measurement approach, we show that thermal effusivity distribution of the water coolant over the hot-spot is correlated to the single-phase convective heat transfer coefficient, where both the stagnant fluid (i.e., conduction and natural convection) and flowing fluid (i.e., forced convection) contributions are decoupled from each other. Our measurements of the local enhancement in the HTC over the hot-spot are in good agreement with established Nusselt number correlations. For example, our flow cooling results using a Ti metal wall support a maximum HTC enhancement via forced convection of ≈1060 ± 190 kW/m2 K, where the Nusselt number correlations predict ≈900 ± 150 kW/m2 K.

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Section: Introductionmentioning

confidence: 99%

Probing the Local Heat Transfer Coefficient of Water-Cooled Microchannels Using Time-Domain Thermoreflectance

Mehrvand

Putnam

2017

Journal of Heat Transfer

View full text Add to dashboard Cite

show abstract

“…Additionally, the micro reformer can reduce multi-stages requirement in hydrogen production system (evaporator, heat exchanger, separator, etc.) by combining several stages in a single unit [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%