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Showing 1 to 20 of 73 for “"flow boiling"”.
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Structured surface enhanced flow boiling
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Instability of flow boiling in parallel microchannels
… charge, encounters important problems related to flow maldistribution and instabilities in parallel-channels flow. The thermal and hydrodynamic performance of a microchannel evaporator can drastically decrease, due to the presence of instabilities, and maintaining a set point for operational …
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Flow Boiling in Meso-Scale Pin-Fin Coldplates
… and improved temperature uniformity. Recent flow boiling studies have focused on fin-enhanced silicon microgaps and microchannels, given their importance in cooling high-power-density chips operating at ultra-high heat fluxes. However, the majority of the research on flow boiling in mini- and …
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Flow boiling of R134a in vertical mini-diameter tubes
… term experimental project devoted to investigate flow boiling heat transfer, pressure drop and flow visualization of R134a in small to mini/micro-diameter tubes. The experimental facility was first designed and constructed by X. Huo (2005) with the contribution of L. Chen (2006). In the present …
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Transient flow boiling CHF under exponentially escalating heat inputs
… as the fuel composition. During such an event, boiling of the water coolant can provide not only an effective way of heat removal, but also a stabilizing, negative reactivity feedback. However, the reactor power could reach extremely high levels and lead to a boiling crisis, e.g. by departure …
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Convection and Flow Boiling in Microgaps and Porous Foam Coolers
… mass fluxes and the results are projected onto a flow regime map. Infrared (IR) thermography is used to explore the two-phase characteristic of FC-72 inside the channel instantaneously. Also the single and two-phase heat transfer and pressure drop of porous metal foam which can enhance the cooling …
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Experimental investigation of variability between nucleation sites in flow boiling
This Thesis was approved for publication on 2017-12-04 at 12:43.
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An Investigatio of Subcooled flow Boiling with Emphasis o nits Initiation
Made available in DSpace on 2017-07-06T18:55:40Z (GMT). No. of bitstreams: 2 Nourmohammadi_Khosrow_MS.pdf: 44965532 bytes, checksum: e061f1448c007bf887afc3534ab2da4a (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1980
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An experimental study of the flow boiling of refrigerant-based nanofluids
… study is focused on the use of nanofluids in flow boiling applications, with CO2 and R134a used as the base refrigerants. CuO nanoparticles 40nm in size, and TiO2 nanoparticles 200nm in size are used to create partially stable CO2-based nanofluids. Stable nanofluids are created in R134a by …
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Surface structure enhanced microchannel flow boiling of low surface tension fluids
Microchannel flow boiling can meet the thermal management requirements of high power and high frequency integrated circuits, but the technology has been limited by the instabilities unique to their length scales. During microchannel flow boiling of water, many of these instabilities have been …
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Bubble behavior in subcooled flow boiling on surfaces of variable wettability
Flow boiling is important in energy conversion and thermal management due to its potential for very high heat fluxes. By improving understanding of the conditions leading to bubble departure, surfaces can be designed that increase heat transfer coefficients in flow boiling. Bubbles were visualized …
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Experimental study of heat flux partitioning in pressurized subcooled flow boiling
Understanding of subcooled flow boiling and the critical heat flux (CHF) is of the utmost importance for both safety and profitability of pressurized water nuclear reactors since they are major factors in the determination of the reactor power rating. Motivated by the emergence of a new wall …
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Pool and flow boiling of novel heat transfer fluids from nanostructured surfaces
… by CAMD were constrained by limiting their boiling points, latent heat of vaporization and thermal conductivity. The selected candidates were further screened using a figure of merit (FOM) analysis. Some of the fluids/additives that have been identified after the FOM analysis include …
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Numerical investigation into the effects of multiple bubbles in microchannel flow boiling
… contact area. Microchannel heat sinks utilising flow boiling have been shown to produce heat fluxes orders of magnitude higher than those of their macroscale counterparts. Several factors influence the high heat transfer capabilities of the systems such as taking advantage of both the sensible …
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Synthesis of CRUD and its effects on pool and subcooled flow boiling
… Unidentified Deposits) on pool and subcooled flow boiling parameters. Previous pool boiling studies have demonstrated the potential of porous, hydrophilic surfaces to lead to more efficient boiling. CRUD is a naturally occurring porous, hydrophilic layer that forms on fuel rods during reactor …
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The influence of gravity on pressure drop and heat transfer in flow boiling
… pressure drop, and vapor volume fraction in flow boiling of R11 can be studied in vertical upflow, vertical downflow, and horizontal flow configurations.
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