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 9 of 9 for “"Smooth tube"”.
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The Effect of Axial Spacing of Constant and Variable Blockages on the Deflagration-to-Detonation Transition in a Pulse Detonation Engine
… in 82 times the inner diameter in a "smooth" tube. This is a greater than 63% decrease in detonation transition length. This decrease in length will further facilitate the integration of pulse detonation engines into gas turbine engines.</p>
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Effect of longitudinal micro fin tube enhancement in evaporation of R410A
… of evaporating heat transfer was conducted for smooth and coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat fluxes from 4 to 14 kW/m2, and qualities from 0.1 to …
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Uncovering Signalling Pathways Mediating Gastrointestinal Morphogenesis and Tumorigenesis
… during development, in which a simple, smooth tube rapidly rearranges to form millions of finger-like projections called villi that line the entire intestinal tract. While gastrointestinal development requires precisely coordinated intercellular communication via signalling pathways, …
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Flow pattern mapping of horizontal evaporating refrigerant flow based on capacitive void fraction measurements
… of horizontal evaporating refrigerant flow in smooth round macro-scale tubes are investigated. A macro-scale test facility for two-phase flow and heat transfer studies of HFCs was designed and constructed. Secondly, a capacitive void fraction sensor was developed to study the dynamic behavior …
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Thermohydraulic Performance of Supercritical Carbon Dioxide (sCO2) in Horizontal Enhanced Surface Tubes
… but they are limited mainly to small diameter smooth tubing. Limited research has been conducted examining the thermohydraulic performance of sCO2 in non standard or enhanced surface geometry despite their increasing use in high performance heat exchangers. Recent research has explored enhanced …
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Modeling heat rejection in horizontal smooth round tubes and experimental validation for R1234ze(E), R134a and R32
… of 20 0C to superheat of 50 0C in a horizontal smooth tube with 6.1 mm inner diameter. Cavallini et al. (2006) and Gnielinski correlations have been used as a baseline correlation to calculate HTC in two-phase and single phase zone respectively. The model predicts the HTC satisfactorily within …
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Time-fractional analysis of flow patterns during refrigerant condensation
The conceptual design and basic layout of a modular refrigerant test system capable of flow condensation and evaporation were performed. The purpose of this study was the investigation of flow patterns during refrigerant condensation in intermittent flow in order to improve the prediction models. …
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Effect of micro-fin geometry on flow and heat transfer during evaporation in round tubes
… flow pattern in transparent micro-finned tubes under both adiabatic and diabatic conditions. Rather than the conventional sight-glass method (without internal micro-fin geometry in the clear tube), clear resin tubes are made by a 3D printer to reproduce the real internal geometry in the …
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Non-equilibrium effects on in-tube condensation from superheated vapor
… has the highest temperature at the center of the tube and the lowest temperature at the tube wall. Hence, as the bulk temperature of the refrigerant decreases, the temperature of the inner tube wall drops to the saturation temperature before the refrigerant. Assuming that the tube is made out of …