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01011 Natural-convection boundary-layer flow on a vertical surface with Newtonian heating
16
Fuel science and technology (fundamental
science, analysis, instrumentation)
Mlcrowavr sensor for the determlnatlon of drnrlty 95/01005 in gaa/solld fluidizad bed8 Hauschild, T. and Knoechel, R. Chem.-lng.-Tech., 1994,66, (4), 522-523. (In German) Discusses the princi les and advantages of a microwave sensor s stem especially designed Por density measurements in ciruclating fluidixe (r-beds of coal firing systems. Provides example measurements in fluidized sand and reflection measurements in a 6cm layer of burned clay spheres which allowed the detection of falling strands of material and demonstrated the penetrability of thick material layers, respectively.
95l01012 New rxampler of reactlon calorimetry appllcstlon In evaluating safsty and In process development Cardillo, P. et al., La Rivista dei Combustibili, May 1994, 48, (5), W-206. (In Italian) Reaction calorimetry is a very efficient tool to obtain thermochemical and kinetic data under realistic orocess conditions for the develooment and optimization of chemical piocesses. Quantitative information’ about the possible thermal hazard potential is also directly available at a very early stage of process development. In this pa r, new examples of the applicaevelopment are presented. tion of reaction calorimetry in process 8”
95lO1006 Mixed convection over nonlrothermal horizontal ?? urfacea In a poroua medlum: The entlrr reglmr Aldoss, T. K. et al., Numerical Heat Transfer, Part A, Applications, Jun. 1994, 25, (6). 685701. ‘lbe paper investigates the flow and heat transfer characteristics of mixed convection from horizontal surfaces in a saturated porous medium.
95/01013 New, strongly conaervatlve finlto-volume formation for fluld flows In Ir ular geometrler urlng contravarlant veloclty components. Pa “4 2. Aaae8amont Sharatchandra, M. C. and Rhode, D. L. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 53-62. The purpose of this article is to evaluate the performance of a strongl conservative finite-volume formulation described in a orevious article wtt.; the use of standard test problems. In this regard, twb test problems that represent various aspects of flow in complex geometries are solved. These aspects range from grid curvature and skewness to steep pressure and velocity gradients in the flow field. The test problems also possess either exact or otherwise previously established solutions. This allows estimates of the performance of the present approaches relative to earlier studies.
95lO1997 Mlxrd flnlte-dlffersnce/lntegral transform approach for parabollc-hyperbolic problems In tranalrnt forced conveictlon Cotta, R. M. and Gerk, J. E. Numerical Heat Transfer, Part B, Fundamentals, Jun. 1994, 25, (4), 433-448. The integral transform method is employed in conjunction with secondorder accurate explicit finite-difference schemes, to handle accurately a class of parabolic-hyperbolic problems that appear in connection with transient forced convection inside ducts. The integral transformation process eliminates the independent variables in which the diffusion phenomena predominate. A system of coupled hyperbolic equations then results, involving time and the space coordinates in which convection is dominant, which is solved numerically through a modified upwind second-order finite-difference scheme. Stability and convergence characteristics of the proposed mixed approach are also examined. Model of gas-coal msdlum with a sorption 95lO1999 phenomenon Bauer, J. and Lydzba, D. Transp. Porous Media, 1994, 14, (3), 207-217. Presents constitutive equations of a gas-coal two-phase medium with a local mass exchange due to a sorption-desorption phenomenon. The equations are derived by using the theory of mixtures. The parameters of the constitutive equations have been calculated on the basis of results of laboratory tests. 95lO1909 Model-based approach for fault dlagnoslr. I. Prlnclpies of deep model algorlthm Chang, I. C. et al., Ind. Eng. Chem. Rex, Jun. 1994, 33, (a), 1542-1555. Equation types of deep models are often employed in fault diagnosis. Upon diagnosis this uantitative process knowledge is utilized as a criterion for satisfaction&to*‘fation in a Boolean or non-Boolean manner. Therefore, the resolution of equation-oriented fault diagnosis systems is often limited to, at most, fault isolation at a qualitiative level. A deep model algorithm @MA) is proposed to improve diagnostic resolution. Results show that the proposed method is effective in identifying fault origins. 95101010 Multldlmenrlonal flnlte-element code for tranalent heat transfer calculatlonr Baker, D. M. and Assanis, D. N. Numerical Heat Transfer, Part B, Fundamentals, Jun. 1994, 25, (4), 395-414. A transient, multidimensional, finite-element code has been developed for predicting the time-dependent thermal field within solid geometries exposed to spatially varying, time-dependent boundary condit&ts. First, validation of the code is performed using both two- and three-dimensional finite-element meshes exposed to either step change or harmonically varying boundary conditions. Numerical predictions from the simulation are in very good agreement with analytical solutions for all ty s of elements and boundary conditions considered. Subsequently, the eR”ects of time step, sampling frequency of harmonic boundary conditions, and grid density on solution accuracy and convergence are explored. Natural-convection boundary-layer flow on a vertl95/01011 cal surface wlth Newtonian heating Merkin, J. H. Int. J. Heat & Fluid Plow, Oct. 1994, 15, (5), 392-398. The natural-convection boundary-layer flow on a vertical surface generated by Newtonian heating in which the heat transfer from the surface is proportional to the local surface temperature is discussed. Solutions valid near the leading edge and valid far downstream are obtained and are joined by a numerical solution of the governing equations. The solution far downstream gives rise to a novel similarity system that is analyzed in detail, with solutions being obtained for large and small values of the Prandtl number.
95lO1014 New, atrongly conrervatlve flnlte-volume formulatlon for fluid flowr In Irregular grometrles ualng contravarlant velocity components: Part 1. Theory Sharatchandra, M. C. and Rhode, D. L. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 39-52. A strongly conservative finite-volume procedure is presented for flows in complex geometries. The technique is based on a complete transformation of the governing equations, and physical velocity components, rather than the traditionally used Cartesian velocity components, are used as primitive variables. It was found that oroiectinn the discretixed vector transoort eauation in the direction of the ‘w;arian~baae vectors eliminated two sub&ntial difficulties associated with flows in complex geometries. These difftculties stem from the presence of cross-pressure gradient terms and the need for a transformation between the different types of curvilinear velocity components in the mass conservation equation. 95/01015 Normallzrd variable and rpace formulatlon methodology for high-resolution schemer Danvish, M. S. aid Moukalled, F. H. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 79-96. The normalized variable formulation (NW) methodology of Leonard ptovtdes the proper framework for the development and analysis of htghresolution convection-diffusion schemes, which combine the accuracy of higher-order schemes with the stability and boundedness of the fit-order upwind scheme. However, in its current form the NVF methodology helps in deriving convective schemes for uniformly or nearly uniformly discretized s aces. To remove this shortcoming, a new, normalized variable and space Formation methodology is developed. In the newly developed technitty s atial parameters are introduced so as to extend the applicability of d methodology to nonumformly dtscretued domains. 95/01016 Numorlcal analyslr of orclllato lnatablllty of buoyancy convection with the Galsrkln rpectrar method Gelfgat, A. Y. and Tanasawa, I. Numerical Heat Transfer, Part A, Applications, Jun. 1994, 25, (6), 627-648. The Galerkin spectral method with basis functions previously introdued by Gelfgat is applied for analysis of oscillatory instability of convective flows in laterally heated rectangular cavities. 95/01017 Numrrlcal analyrls of water spray rystem In the entrance region of a two-dlmenslonal channel urlng Lagranglan approach Jicha, M. et al., Numerical Heat Transfer, PartA, Applications, Jul. 1994, 26, (1). l-16. A numerical study of a turbulen gas-liquid droplet flow is resented using the Lagrangian approach for the discrete phase and the EuPerian approach for the continuous phase. 95lOlOl6 On the characterlzatlon of fullerenes Randic, M. Fullerene Science & Technology, 1994, 2, (4), 427444. The author resents a characterization of fullerenes basedon 12 by 12 matrices wh Pch register separations between all twelve pentagonal faces in fullerenes. Some properties of matrices (eigenvalues, the characteristic palynomial and sequences based on distance distributions) are illustrated. It is shown that derived invariants can serve for classification and charactetization of not only different fullerene isomers but also for characterization of pentagonal faces in individual fullerenes.
Fuel and Energy Abstracts January 1995
59
Fuel science and technology (fundamental
science, analysis, instrumentation)
Mlcrowavr sensor for the determlnatlon of drnrlty 95/01005 in gaa/solld fluidizad bed8 Hauschild, T. and Knoechel, R. Chem.-lng.-Tech., 1994,66, (4), 522-523. (In German) Discusses the princi les and advantages of a microwave sensor s stem especially designed Por density measurements in ciruclating fluidixe (r-beds of coal firing systems. Provides example measurements in fluidized sand and reflection measurements in a 6cm layer of burned clay spheres which allowed the detection of falling strands of material and demonstrated the penetrability of thick material layers, respectively.
95l01012 New rxampler of reactlon calorimetry appllcstlon In evaluating safsty and In process development Cardillo, P. et al., La Rivista dei Combustibili, May 1994, 48, (5), W-206. (In Italian) Reaction calorimetry is a very efficient tool to obtain thermochemical and kinetic data under realistic orocess conditions for the develooment and optimization of chemical piocesses. Quantitative information’ about the possible thermal hazard potential is also directly available at a very early stage of process development. In this pa r, new examples of the applicaevelopment are presented. tion of reaction calorimetry in process 8”
95lO1006 Mixed convection over nonlrothermal horizontal ?? urfacea In a poroua medlum: The entlrr reglmr Aldoss, T. K. et al., Numerical Heat Transfer, Part A, Applications, Jun. 1994, 25, (6). 685701. ‘lbe paper investigates the flow and heat transfer characteristics of mixed convection from horizontal surfaces in a saturated porous medium.
95/01013 New, strongly conaervatlve finlto-volume formation for fluld flows In Ir ular geometrler urlng contravarlant veloclty components. Pa “4 2. Aaae8amont Sharatchandra, M. C. and Rhode, D. L. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 53-62. The purpose of this article is to evaluate the performance of a strongl conservative finite-volume formulation described in a orevious article wtt.; the use of standard test problems. In this regard, twb test problems that represent various aspects of flow in complex geometries are solved. These aspects range from grid curvature and skewness to steep pressure and velocity gradients in the flow field. The test problems also possess either exact or otherwise previously established solutions. This allows estimates of the performance of the present approaches relative to earlier studies.
95lO1997 Mlxrd flnlte-dlffersnce/lntegral transform approach for parabollc-hyperbolic problems In tranalrnt forced conveictlon Cotta, R. M. and Gerk, J. E. Numerical Heat Transfer, Part B, Fundamentals, Jun. 1994, 25, (4), 433-448. The integral transform method is employed in conjunction with secondorder accurate explicit finite-difference schemes, to handle accurately a class of parabolic-hyperbolic problems that appear in connection with transient forced convection inside ducts. The integral transformation process eliminates the independent variables in which the diffusion phenomena predominate. A system of coupled hyperbolic equations then results, involving time and the space coordinates in which convection is dominant, which is solved numerically through a modified upwind second-order finite-difference scheme. Stability and convergence characteristics of the proposed mixed approach are also examined. Model of gas-coal msdlum with a sorption 95lO1999 phenomenon Bauer, J. and Lydzba, D. Transp. Porous Media, 1994, 14, (3), 207-217. Presents constitutive equations of a gas-coal two-phase medium with a local mass exchange due to a sorption-desorption phenomenon. The equations are derived by using the theory of mixtures. The parameters of the constitutive equations have been calculated on the basis of results of laboratory tests. 95lO1909 Model-based approach for fault dlagnoslr. I. Prlnclpies of deep model algorlthm Chang, I. C. et al., Ind. Eng. Chem. Rex, Jun. 1994, 33, (a), 1542-1555. Equation types of deep models are often employed in fault diagnosis. Upon diagnosis this uantitative process knowledge is utilized as a criterion for satisfaction&to*‘fation in a Boolean or non-Boolean manner. Therefore, the resolution of equation-oriented fault diagnosis systems is often limited to, at most, fault isolation at a qualitiative level. A deep model algorithm @MA) is proposed to improve diagnostic resolution. Results show that the proposed method is effective in identifying fault origins. 95101010 Multldlmenrlonal flnlte-element code for tranalent heat transfer calculatlonr Baker, D. M. and Assanis, D. N. Numerical Heat Transfer, Part B, Fundamentals, Jun. 1994, 25, (4), 395-414. A transient, multidimensional, finite-element code has been developed for predicting the time-dependent thermal field within solid geometries exposed to spatially varying, time-dependent boundary condit&ts. First, validation of the code is performed using both two- and three-dimensional finite-element meshes exposed to either step change or harmonically varying boundary conditions. Numerical predictions from the simulation are in very good agreement with analytical solutions for all ty s of elements and boundary conditions considered. Subsequently, the eR”ects of time step, sampling frequency of harmonic boundary conditions, and grid density on solution accuracy and convergence are explored. Natural-convection boundary-layer flow on a vertl95/01011 cal surface wlth Newtonian heating Merkin, J. H. Int. J. Heat & Fluid Plow, Oct. 1994, 15, (5), 392-398. The natural-convection boundary-layer flow on a vertical surface generated by Newtonian heating in which the heat transfer from the surface is proportional to the local surface temperature is discussed. Solutions valid near the leading edge and valid far downstream are obtained and are joined by a numerical solution of the governing equations. The solution far downstream gives rise to a novel similarity system that is analyzed in detail, with solutions being obtained for large and small values of the Prandtl number.
95lO1014 New, atrongly conrervatlve flnlte-volume formulatlon for fluid flowr In Irregular grometrles ualng contravarlant velocity components: Part 1. Theory Sharatchandra, M. C. and Rhode, D. L. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 39-52. A strongly conservative finite-volume procedure is presented for flows in complex geometries. The technique is based on a complete transformation of the governing equations, and physical velocity components, rather than the traditionally used Cartesian velocity components, are used as primitive variables. It was found that oroiectinn the discretixed vector transoort eauation in the direction of the ‘w;arian~baae vectors eliminated two sub&ntial difficulties associated with flows in complex geometries. These difftculties stem from the presence of cross-pressure gradient terms and the need for a transformation between the different types of curvilinear velocity components in the mass conservation equation. 95/01015 Normallzrd variable and rpace formulatlon methodology for high-resolution schemer Danvish, M. S. aid Moukalled, F. H. Numerical Heat Transfer, Part B, Fundamentals, Jul.-Aug. 1994, 26, (l), 79-96. The normalized variable formulation (NW) methodology of Leonard ptovtdes the proper framework for the development and analysis of htghresolution convection-diffusion schemes, which combine the accuracy of higher-order schemes with the stability and boundedness of the fit-order upwind scheme. However, in its current form the NVF methodology helps in deriving convective schemes for uniformly or nearly uniformly discretized s aces. To remove this shortcoming, a new, normalized variable and space Formation methodology is developed. In the newly developed technitty s atial parameters are introduced so as to extend the applicability of d methodology to nonumformly dtscretued domains. 95/01016 Numorlcal analyslr of orclllato lnatablllty of buoyancy convection with the Galsrkln rpectrar method Gelfgat, A. Y. and Tanasawa, I. Numerical Heat Transfer, Part A, Applications, Jun. 1994, 25, (6), 627-648. The Galerkin spectral method with basis functions previously introdued by Gelfgat is applied for analysis of oscillatory instability of convective flows in laterally heated rectangular cavities. 95/01017 Numrrlcal analyrls of water spray rystem In the entrance region of a two-dlmenslonal channel urlng Lagranglan approach Jicha, M. et al., Numerical Heat Transfer, PartA, Applications, Jul. 1994, 26, (1). l-16. A numerical study of a turbulen gas-liquid droplet flow is resented using the Lagrangian approach for the discrete phase and the EuPerian approach for the continuous phase. 95lOlOl6 On the characterlzatlon of fullerenes Randic, M. Fullerene Science & Technology, 1994, 2, (4), 427444. The author resents a characterization of fullerenes basedon 12 by 12 matrices wh Pch register separations between all twelve pentagonal faces in fullerenes. Some properties of matrices (eigenvalues, the characteristic palynomial and sequences based on distance distributions) are illustrated. It is shown that derived invariants can serve for classification and charactetization of not only different fullerene isomers but also for characterization of pentagonal faces in individual fullerenes.
Fuel and Energy Abstracts January 1995
59