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Showing 1 to 20 of 31 for “"convective heat transfer coefficient"”.
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Studies of Convective Heat Transfer Coefficient Enhancement in Two-Phase, Non-Boiling Flow
… has been conducted to determine the heat transfer coefficient in a non-boiling, two-component, two-phase flow. Both upflow and downflow of air-water mixtures were studied in a 1 inch pipe. The superficial water velocities ranged from 0.40 to 3.24 m/s with the corresponding Reynolds …
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Numerical investigation of the convective heat transfer coefficient of the human body using a representative cylindrical model
… and verify a framework for determining the convective heat transfer co-efficient from a cylindrical model that can easily be adaptable to more complex geometry - more specifically the human body geometry. Analysis of the model under forced convection airflow conditions between the transition …
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Experimental and theoretical investigation of transport phenomena in nanoparticle colloids (nanofluids)
… viscosity and thermal conductivity; to determine convective heat transfer coefficient and viscous pressure losses in an isothermal and heated horizontal tube; and finally to determine the feasibility for potential use as enhanced coolants in energy transport systems, with focus on nuclear …
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Quantification of the Fire Thermal Boundary Condition
… exposed surface was quantified with a hybrid heat flux gage. Methods were developed to determine the net heat flux through the gage, incident heat flux, cold surface heat flux, convective heat transfer coefficient, adiabatic surface temperature, and the separated components of radiative and …
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Heat transfer modeling of jet vane Thrust Vector Control (TVC) Systems
… graphical representation of surface shear stress coefficient, Stanton number and convective heat transfer coefficient.
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Design, construction and initial testing of experimental test package for convective spray cooling in terrestrial gravity conditions
… 9.3 GPH to 4.6 GPH. At each spray flow rate the heat flux of the small heated pedestal located in the spray chamber was increased from 5 W/cm2 to 32.24 W/cm2. During these tests the spray orientation was changed from a vertical downward spray to a horizontal spray. The convective heat transfer …
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On-Line Consolidation of Thermoplastic Composites
… The first model was used to determine the convective heat transfer coefficient for the hot-air heat source. A convective heat transfer coefficient of 260 w/m2°K was obtained by matching the calculated temperature history to the in-situ measurement data. To predict temperature distribution …
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SCALE MODELING OF THE TRANSIENT BEHAVIOR OF HEAT FLUX IN ENCLOSURE FIRES
… Based on this hypothesis, scaling relations for convective and radiative heat transfer within compartment fires is presented. A technique to measure and differentiate convective and radiative heat flux in compartment fires is presented which utilizes a newly developed metal plate sensor and …
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Experimental investigation of building envelope and air source heat pumps in Canadian cold climate
… than 60% of residential energy is used for space heating, yet the adoption of air-source heat pumps (ASHPs) is slower compared to the global average despite their high efficiency and potential for building electrification. This slow adoption is partly due to the low efficiency of ASHPs in cold …
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The oscillogenic control algorithm
… hz), a linear indication of the thermal system's convective heat transfer coefficient, which varied from 230 to 400 W/m²-°C.
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Mathematical Modeling of High Intensity Infrared Heating of a Food Matrix
Infrared heating has been used by the food industry for many years. Some of the advantages of infrared heating are its high intensity, ability to penetrate the product, and precise control. While infrared heating has unique advantages over convective and conductive heating, the complex mathematics …
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Development and application of transition detection using infrared thermography for characterization of fan blade waviness effects
… surfaces. The approach relies on computing the convective heat transfer coefficient field on the test surface and inferring transition region from the same. The transition location identified from infrared images is assessed against hotwire measurement which establishes transition location based …
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An experimental investigation of heat transfer to hydrogen peroxide in microtubes
… to the cooling scheme. To address this issue, heat transfer experiments in 95 [mu]m inside diameter, 4 mm long, electrically heated stainless steel microtubes have been performed to define the stability limit and explosion condition associated with 98% hydrogen peroxide thermal decomposition. …
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A study of interactions between laminar flames and walls
A basic study on the convective flame-wall heat transfer in diesel engines was performed with a fundamental experiment and simplified theoretical models. Based on the concept of flame tubes, a combustor was designed and optimized to support laminar, stable flame propagation at constant ambient …
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Experimental determination of heat transfer and fluid flow over drift-emplaced canisters
… above the floor of the drifts and exchange heat with the walls of the drift and with air circulating through the repository. To assess the requirements of the repository ventilation system, values of the dimensionless convective heat transfer coefficient and the pressure drop across …
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Fan-Shaped Hole Film Cooling on Turbine Blade and Vane in a Transonic Cascade with High Freestream Turbulence: Experimental and CFD Studies
… pitch of 58.4mm and 83.3mm respectively). Both convective heat transfer coefficient, in terms of Nusselt number, and adiabatic effectiveness are provided in the results. Present research work also numerically investigates the shock/film cooling interaction. A detailed analysis on the physics of …
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Near-wall reaction effects on film-cooled surface heat transfer
… ratios, there exists a potential for significant heat release to occur in the turbine if energetic species emitted from the combustor are further oxidized during interaction with film-cooling flows. Currently there is little basis for understanding the effects on aero-performance and durability …
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Thermal analysis of power hybrid microelectronic packages
… thermal resistance (expressed as an equivalent convective heat transfer coefficient, h). In this study, the impact on thermal management of thick film metallization and copper cladding on alumina, aluminum nitride, and beryllia ceramic substrates is compared. The thermal conductivity of the …
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Numerical investigation of the influence of elevated turbulence levels on the cooling effectiveness of an anti-vortex hole geometry
… as the turbulence intensity was elevated. The convective heat transfer coefficient was also shown to increase at the turbulence intensity was elevated. An increase in the heat transfer coefficient is a deleterious effect and must be weighed against the improvements in the adiabatic cooling …
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Heat Transfer Measurements and Optimization Studies Relevant to Louvered Fin Compact Heat Exchangers
A compact heat exchanger is a device used to transfer thermal energy between two or more fluids. The most extensive use of compact heat exchangers occurs in the commercial trucking industry. Most compact heat exchanger designs contain tubes carrying one fluid and external fins through which passes …
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