MODELING TWO-PHASE FLOW HEAT TRANSFER Stratified Flow Heat Transfer Dispersed Bubble Heat Transfer Slug Flow Heat Transfer Heat Transfer Prediction in Wellbores 7.1 7.2. 11 Fluid Flow and Heat Transfer in Wellbores. 8 Rejuvenation of Marginal Offshore Fields (on CD) SPE Reprint Series No. 10 Economics of Worldwide Petroleum Production. Read 07Catalog.indd text version New for 2007 Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chief. SPE Reprint Series No. 11 Fluid Flow and Heat Transfer in Wellbores.. Heat Fluid Flow 25: 481 . Effects of liquid viscosity on flow patterns in vertical upward gas-liquid two-phase flow. Assessment of the heat either delivered from high temperature rocks to the borehole or transmitted to the rock formation from circulating fluid is of crucial im. Introduction The heat transfer process plays an important role in a number of industrial applications. The phase distributions and mechanical properties of annular flow can be regarded as random states. A model for droplet entrainment in heated annular flow Int. Heat Fluid Flow, 23 (2002), pp. The RealGas and RealGasH2O options of the TOUGH+ code for the simulation of coupled fluid and heat flow in tight/shale gas systems Authors: George J. Freeman Published in: Topics by National Library of Energy. Convective heattransfer inside passive solar buildings. Sci. Tech Connect (OSTI)Jones, R. W.; Balcomb, J. D.; Yamaguchi, K. Natural convection between spaces in a building can play a major role in energy transfer. Two situations are investigated: convection through a single doorway into a remote room, and a convective loop in a two- story house with a south sunspace where a north stairway serves as the return path. A doorway- sizing equation is given for the single- door case. Detailed data are given from the monitoring of airflow in one two- story house and summary data are given for five others. Observations on the nature of the airflow and design guidelines are presented. Nuclear reactor fuel element having improved heattransfer. DOE Patents . The element consists of an outer cladding tube divided into an upper fuel section containing a central core of fissionable or mixed fissionable and fertile fuel material, slightly smaller in diameter than the inner surface of the cladding tube and a small lower accumulator section, the cladding tube being which is filled with a low molecular weight gas to transferheat from fuel material to cladding during irradiation. A plurality of essentially vertical grooves in the fuel section extend downward and communicate with the accumulator section. The radial depth of the grooves is sufficient to provide a thermal gradient between the hot fuel surface and the relatively cooler cladding surface to allow thermal segregation to take place between the low molecular weight heattransfer gas and high molecular weight fission product gases produced by the fuel material during irradiation. Low heattransfer, high strength window materials. DOE Patents . Between at least one pair of panes is a convection defeating means comprising an array of parallel slats or cells so designed as to prevent convection currents from developing in the space between the two panes. The convection defeating structures may have reflective surfaces so as to improve the collection and transmittance of the incident radiant energy. These same means may be used to control (increase or decrease) the transmittance of solar energy as well as to decouple the radiative transfer between the interior surfaces of the transparent panes. Radiative heattransfer in 2. D Dirac materials. Sci. Tech Connect (OSTI)Rodriguez- L. R. 2. 01. 5- 0. 5- 1. We compute the radiative heattransfer between two sheets of 2. D Dirac materials, including topological Chern insulators and graphene, within the framework of the local approximation for the optical response of these materials. In this approximation, which neglects spatial dispersion, we derive both numerically and analytically the short- distance asymptotic of the near- field heattransfer in these systems, and show that it scales as the inverse of the distance between the two sheets. In conclusion, we discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2. D Dirac materials. Combined heat and mass transfer device for improving separation process. DOE Patents . The small channel heat exchange matrix is composed of a series of channels having a hydraulic diameter no greater than 5. In operation, the matrix provides the liquid- vapor contacting surfaces within the separation column, such that heat and mass are transferred simultaneously between the liquid and vapor phases. The two- phase coolant allows for a uniform heattransfer coefficient to be maintained along the length of the channels and across the surface of the matrix. Preferably, a perforated, concave sheet connects each channel to an adjacent channel to facilitate the flow of the liquid and vapor phases within the column and to increase the liquid- vapor contacting surface area. Combined heat and mass transfer device for improving separation process. DOE Patents . The small channel heat exchange matrix is composed of a series of channels having a hydraulic diameter no greater than 5. In operation, the matrix provides the liquid- vapor contacting surfaces within the separation column, such that heat and mass are transferred simultaneously between the liquid and vapor phases. The two- phase coolant allows for a uniform heattransfer coefficient to be maintained along the length of the channels and across the surface of the matrix. Preferably, a perforated, concave sheet connects each channel to an adjacent channel to facilitate the flow of the liquid and vapor phases within the column and to increase the liquid- vapor contacting surface area. Advanced multistage turbine blade aerodynamics, performance, cooling, and heattransfer. Sci. Tech Connect (OSTI)Fleeter, S.; Lawless, P. B. 1. 99. 5- 1. 0- 0. The gas turbine has the potential for power production at the highest possible efficiency. The challenge is to ensure that gas turbines operate at the optimum efficiency so as to use the least fuel and produce minimum emissions. A key component to meeting this challenge is the turbine. Turbine performance, both aerodynamics and heattransfer, is one of the barrier advanced gas turbine development technologies. This is a result of the complex, highly three- dimensional and unsteady flow phenomena in the turbine. Improved turbine aerodynamic performance has been achieved with three- dimensional highly- loaded airfoil designs, accomplished utilizing Euler or Navier- Stokes Computational Fluid Dynamics (CFD) codes. These design codes consider steady flow through isolated blade rows. Thus they do not account for unsteady flow effects. However, unsteady flow effects have a significant impact on performance. Also, CFD codes predict the complete flow field. The experimental verification of these codes has traditionally been accomplished with point data - not corresponding plane field measurements. Thus, although advanced CFD predictions of the highly complex and three- dimensional turbine flow fields are available, corresponding data are not. To improve the design capability for high temperature turbines, a detailed understanding of the highly unsteady and three- dimensional flow through multi- stage turbines is necessary. Thus, unique data are required which quantify the unsteady three- dimensional flow through multi- stage turbine blade rows, including the effect of the film coolant flow. This requires experiments in appropriate research facilities in which complete flow field data, not only point measurements, are obtained and analyzed. Also, as design CFD codes do not account for unsteady flow effects, the next logical challenge and the current thrust in CFD code development is multiple- stage analyses that account for the interactions between neighboring blade rows. Three- dimensional nonsteady heat- transfer analysis of an indirect heating furnace. Sci. Tech Connect (OSTI)Ito, H.; Umeda, Y.; Nakamura, Y.; Wantanabe, T.; Mitutani, T. The authors carried out a three- dimensional nonsteady heat- transfer analysis for a practical- size heat- treatment furnace equipped with radiant heaters. The authors applied three software package programs, STREAM, MORSE, and TRUMP, for the analysis of the combined heat- transfer problems of radiation, conduction, and convection. The authors also carried out experiments of the heating of a charge consisting of packed bolts. The authors found that the air swirled inside the furnace. As for the temperature in each part in the furnace, analytical results were generally in close agreement with the experimental ones. This suggests that our analytical method is useful for a fundamental heat- transfer- based design of a practical- size industrial furnace with an actual charge such as packed bolts. As for the temperature distribution inside the bolt charge (work), the analytical results were also in close agreement with the experimental ones. Consequently, it was found that the heattransfer in the bolt charge could be described with an effective thermal conductivity. A 2- D Test Problem for CFD Modeling Heat. Transfer in Spent Fuel Transfer Cask Neutron Shields. Sci. Tech Connect (OSTI)Zigh, Ghani; Solis, Jorge; Fort, James A. In the United States, commercial spent nuclear fuel is typically moved from spent fuel pools to outdoor dry storage pads within a transfer cask system that provides radiation shielding to protect personnel and the surrounding environment. The transfer casks are cylindrical steel enclosures with integral gamma and neutron radiation shields. Since the transfer cask system must be passively cooled, decay heat removal from spent nuclear fuel canister is limited by the rate of heattransfer through the cask components, and natural convection from the transfer cask surface. The primary mode of heattransfer within the transfer cask system is conduction, but some cask designs incorporate a liquid neutron shield tank surrounding the transfer cask structural shell. In these systems, accurate prediction of natural convection within the neutron shield tank is an important part of assessing the overall thermal performance of the transfer cask system. The large- scale geometry of the neutron shield tank, which is typically an annulus approximately 2 meters in diameter but only 5- 1. CFD) modeling. Relevant experimental data at these scales are not available in the literature, but some recent modeling studies offer insights into numerical issues and solutions; however, the geometries in these studies, and for the experimental data in the literature at smaller scales, all have large annular gaps that are not prototypic of the transfer cask neutron shield. This paper presents results for a simple 2- D problem that is an effective numerical analog for the neutron shield application. Because it is 2- D, solutions can be obtained relatively quickly allowing a comparison and assessment of sensitivity to model parameter changes. Turbulence models are considered as. Temperature distribution in a flowing fluidheated in a microwave resonant cavity. Sci. Tech Connect (OSTI)Thomas, J. Shoham Mechanistic Modeling . Are you sure you want to continue? CANCELOKcanceldelete collection. However, it looks like you listened to.
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