Abstract
The paper deals with the experimental study of the gas (nitrogen) driven rivulet flow regimes of water outflowing from the nozzle with a width of 10 mm into minichannel with the height of 1.6±0.02 mm and a width of 30 mm. The authors revealed a new flow regime – namely “rivulet bridge” whose occurrence is attributed to the influence of relatively large static wetting angle of water on the flow regimes. The paper presents a map of the various rivulet flow regimes characterized by different surface geometry and types of surface deformations.
Highlights
IntroductionAgainst the background of the rapid development of electronics (reduction in the characteristic size of transistors) there is a need for effective cooling system that can be used in the aircraft industry (braking systems, microelectronics, etc.), automotive industry (power electronics in inverters, braking system, etc.) and in other industries.A liquid film flow refers to a separate flow in which the fluid flows over the entire surface of the substrate
Against the background of the rapid development of electronics there is a need for effective cooling system that can be used in the aircraft industry, automotive industry and in other industries.A liquid film flow refers to a separate flow in which the fluid flows over the entire surface of the substrate
Due to abnormally high heat transfer coefficient in the area of three phase contact line [1, 2], a rivulet flow has high cooling quality, since it is a particular case of the film flow with a contact line bounding the film from both sides, the line, where three phases come into contact
Summary
Against the background of the rapid development of electronics (reduction in the characteristic size of transistors) there is a need for effective cooling system that can be used in the aircraft industry (braking systems, microelectronics, etc.), automotive industry (power electronics in inverters, braking system, etc.) and in other industries.A liquid film flow refers to a separate flow in which the fluid flows over the entire surface of the substrate. Due to abnormally high heat transfer coefficient in the area of three phase contact line [1, 2], a rivulet flow has high cooling quality, since it is a particular case of the film flow with a contact line bounding the film from both sides, the line, where three phases come into contact. The fluid viscosity is significantly higher than gas viscosity Due to this circumstance the use of rivulet flow will provide reduced resistance of the two-phase flow, as well as reduced pressure drop along the channel, and will reduce energy input for pumping of two-phase mixture through a microchannel. Following types of the rivulet flows over inclined surfaces are currently available in the literature: drip flow, straight flow, meandrine flow, flow without waves and with 2D waves, 3D and soliton-type wave flows, as well as swirling flow
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