Flow boiling in copper and aluminium microchannels
نویسندگان
چکیده
The substrate material and active side characteristics can affect the bubble ebullition cycle consequently heat transfer rate pressure drop in microchannel evaporators. This paper presents an experimental study on flow boiling patterns, rates multi-microchannels evaporators made of copper aluminium. HFE-7100 was used as test fluid at atmospheric pressure, 5 K inlet sub-cooling, mass flux 50-250 kg/m2s wall up to 174 kW/m2. All sinks were with channel width 0.46 mm, height giving a mm hydraulic diameter. sink base area 25 length 20 width. results showed that similar patterns visualised for aluminium namely bubbly, slug, churn annular flow. coefficient 12% (average value) higher than found sink. measured 28% compared However, additional pumping power required move through exchanger is small this factor be significant. SEM images surface revealed number cavities (possible nucleation sites) clear-cutting marks surface. may explain different behaviour. present indicate offer comparable thermal performance also recommended cooling high systems.
منابع مشابه
Nucleation characteristics and stability considerations during flow boiling in microchannels
Flow boiling in microchannels and minichannels has received considerable attention in the past decade. The interest stems from the possibility of achieving the extremely high heat fluxes, over 1 kW/cm, needed for future generation electronics cooling application. The attention has been focused on obtaining experimental heat transfer and pressure drop data, but the fundamental aspects of nucleat...
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Flow boiling in small hydraulic diameter channels is becoming increasingly important in many diverse applications. The previous studies addressing the effects of the channel size on the flow patterns, and heat transfer and pressure drop performance are reviewed in the present paper. The fundamental questions related to the presence of nucleate boiling and characteristics of flow boiling in micr...
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ژورنال
عنوان ژورنال: International Journal of Heat and Mass Transfer
سال: 2022
ISSN: ['1879-2189', '0017-9310']
DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2022.123101