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 20 of 33 for “"saturation temperature"”.
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ENHANCEMENT OF SATURATION BOILING OF PF-5060 DIELECTRIC LIQUID ON MICROPOROUS SURFACES
… environmentally friendly, and has low enough saturation temperature (~ 54oC at 0.10 MPa). This helps maintain the chip junctions temperature below that recommended by the chip manufacturer (85-120 oC, depending on the application).'
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Ebulição nucleada em placa plana horizontal com baixos fluxos de calor
ln a horizontal copper disk inmersed in water at saturation temperature heat is transfered in steady state. Levels of heat flux are regulated so that free convection and then nucleate boiling are observed. The value of heat flux is determined experimentally and high speed film is used to register …
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A study of nucleate boiling in an accelerated system
… The change in the heat flux as a function of the temperature difference AT between the wire temperature and the saturation temperature of the water was used as a comparison for the standard one and 2.85 times the standard gravitational field.
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Modeling heat rejection in horizontal smooth round tubes and experimental validation for R1234ze(E), R134a and R32
… due to presence of liquid when the wall temperature drops below saturation temperature. Similarly, HTC below x=0 has been seen to decrease linearly before following Gnielinski correlation due to presence of vapor as seen in sight glass at the end of test section. The newly proposed model …
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Recovery Strategies and Flow Modeling in Fractured Grosmont Carbonates with High Permeability Conduits
… and studied. Furthermore, a lower density and saturation temperature light solvent-aided process performs especially well in a heterogeneous carbonate reservoir with high permeability conduits. Parameter sensitivity effects are analyzed for each recovery strategy. The Brinkman-Stokes equations …
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Solid-state Polymer Nanofoams
… molecular weight) and varying glass transition temperature. Molecular weight and glass transition temperature are two of the most important parameters of polymers; however, their effect on cell nucleation was not reported previously in literature. In this study, it is found that the polymer with …
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Effect of longitudinal micro fin tube enhancement in evaporation of R410A
… 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 0.8. The testing facility had a 15 cm long test section heated by a secondary heated water loop, a transparent …
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The effect of a knurled heat transfer surface upon pool nucleate boiling of normal pentane
… The liquid boiled was normal pentane at its saturation temperature and a pressure of 760 millimeters mercury.</p> <p>For some of the knurled surfaces the temperature difference required to produce a given heat flux was found to be less than half that required for an unknurled control surface. …
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Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors
… investigate the effect of RFRD on the peak clad temperature during BWR instability and LOCA. The device is simulated in TRACE by using high friction coefficients for the reverse flow to ensure that only forward flow is allowed. The results demonstrate that by adding the RFRD device, flow reversal …
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Investigation of oil retention and pressure drop in suction lines using R134a with AB ISO 32
… system operating conditions were kept fixed at a saturation temperature of 13˚C and a superheat of 15˚C. The mass flux was varied from 30 kg/m2-s – 140 kg/m2-s, and three OCRs of 1%, 3% and 5% were tested. The experimental results of the current work were compared to results of R134a/POE100 by …
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Oil retention and pressure drop of R1234yf and R134a with POE ISO 32 in suction lines
… horizontal and vertical suction lines at saturation temperature of 13oC with 15oC of superheat is presented. The effect of pipe inclination on oil retention was also investigated. High speed videos of the flow were taken to relate flow regimes to the oil retention data. Test results show …
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Heat transfer enhancement phenomena and pressure drop characteristics in two-phase pulsating flow using R-134A
… test section using external air flow at ambient temperature. The test parameters varied as follows: mass flux, 75 – 250 kg/m2-s (55 – 184 klbm/ft2-hr); heat flux, 2-12 kW/m2 (600-3800 Btu/hr-ft2); vapor quality, 10-98 percent; saturation temperature 15 oC (59 oF); flow pulsation period (2-24 …
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Erosion and rolling contact wear mechanisms in silicon nitride hybrid bearings.
… affected the life of bearings. Being low saturation temperature fluids, change of phase is very common in refrigerants and cryogenic liquids, which lead to cavitation. Silicon nitride rolling elements with different sintering additives, properties and microstructure were experimentally …
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Fault Detection And Diagnosis For Air Conditioners And Heat Pumps Based On Virtual Sensors
… to measurements of condensing and evaporating saturation temperature, and inlet temperature measurements. The second model uses a compressor energy balance with the power consumption from a virtual compressor power (VCP) sensor and energy heat loss model, which is relatively independent of …
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A STUDY ON THE PHYSICS OF ICE ACCRETION IN A TURBOFAN ENGINE ENVIRONMENT
… empirically identified the effects of pressure, temperature and relative humidity on the equilibrium surface temperature and the characteristic ice that accretes. In these cases with freezing fraction and impinging particle temperature as experimental unknowns, the on-set of ice accretion on an …
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Investigation of oil retention and pressure drop in suction lines using R1234yf, R134a and R410A with POE ISO 100
… about 2 m long, using POE ISO 100 lubricant. A saturation temperature of 13 °C and a superheat of 15 °C were employed, while the superficial refrigerant vapor velocity was varied between 1-6 m/s. Experiments were also performed in R134a in order to study if R1234yf is a suitable drop-in …
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Molecular dynamic simulation of pool boiling process
… coefficient was not possible. In this work, temperature of the heated surface was controlled variable and the value of heat flux was measured. Simulation was conducted for water at pressure 2.7 bar, which is typical pressure of reflood and passive cooling systems. The bulk of the water was …
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Intermediate vapor bypass: A novel design for mobile heat pump at low ambient temperature
… drop was noticed at extremely low ambient temperature, mainly due to low operating pressure in the outdoor evaporator. Decreasing suction density along with dropping evaporating temperature and suction pressure led to much lower refrigerant mass flow rate with maximum compressor speed. At …
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Heat transfer and pressure drop in the condensing superheated region with visualization and film thickness measurement
… zone. Condensation actually starts when the wall temperature reaches saturation, even in the presence of superheated vapor. Similarly, condensation continues if some vapor remains even when the bulk refrigerant enthalpy is indicating a subcooled state. These two situations make a fourth and fifth …
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Improving heat capture for power generation in coal gasification plants
… pressure level in composite curves based on its saturation temperature alone. The present work examines the effect of including both sensible and latent heating of steam in the composite curve. It is shown that including sensible heating allows for better thermal matching between the process and …
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