Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Churn flow"”.
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Refrigerant flow distribution in vertical headers of reversible microchannel heat exchangers
… heat exchangers. The total and liquid mass flow rate in each microchannel tube is determined based on experimental measurement. Two-phase flow in the transparent vertical header is visualized by a high speed camera, in assist to understand the distribution among microchannel tubes. The …
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CFD modelling of pipe erosion under multiphase flow regimes.
… efficiency of pipe-lines and other related flow systems. Proper knowledge of the flow characteristics, particle behaviour and geometric effects is very important in the accurate prediction of erosion rates and location. This study focuses on predicting erosion under complex multiphase flow …
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Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… problem of distribution of two phase adiabatic flow in headers of parallel flow evaporators, of typically microchannel design. Three main issues that will be explored in this thesis are: 1) separation of vapor-liquid refrigerant immediately after an expansion device in a compact T-junction and …
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Performance measurement and visualization on the refrigerant distribution in the vertical manifold of the microchannel tube heat exchanger
… length and microchannel number. The inlet mass flow rate (min) and quality (x) are two main parameters affecting the distribution. The inlet quality was varied from 0.2 to 0.8, and the inlet mass flow rate was varied from 0.8 to 4.5 g/h per microchannel. For all three manifolds, the best …
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Thermal-hydraulic characterization of single- and two-phase immersion cooling for electronic modules
… poorly characterized, especially when complex flow geometries, buoyancy effects, and device-to-device interactions are present. This thesis experimentally investigates single- and two-phase immersion cooling of a representative multi-device PCB in a commercially available dielectric fluid. The …
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Thermohydraulics and suppression of nucleate boiling in upward two-phase annular flow : probing multiscale physics by innovative diagnostics
… steam qualities (typical of the bubbly and slug/churn flow regimes), while forced convective evaporation dominates at higher steam quality in the annular flow regime. The transition of the heat transfer mechanism, also called suppression of nucleate boiling (SNB), affects the local heat transfer …
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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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Computational fluid dynamics modelling of multi-phase flow transition in presence of solid particles.
Multi-phase flow is the type of flow common in the oil and gas industry, as oil reservoirs contain mixtures of oil, gas and water with sand particles from sandstone reservoirs. Accurate design of oil and gas production equipment greatly depends on detailed understanding of this flow phenomena. …