scholarly journals 2D Model of Transfer Processes for Water Boiling Flow in Microchannel

2021 ◽  
Vol 5 (3) ◽  
pp. 42
Author(s):  
Valery A. Danilov ◽  
Christian Hofmann ◽  
Gunther Kolb
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Profiles ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Transfer Processes ◽  
Two Dimensional Model ◽  
Boiling Flow ◽  
Homogeneous Mixture Model ◽  
2D Model

The modeling of transfer processes is a step in the generalization and interpretation of experimental data on heat transfer. The developed two-dimensional model is based on a homogeneous mixture model for boiling water flow in a microchannel with a new evaporation submodel. The outcome of the simulation is the distribution of velocity, void fraction and temperature profiles in the microchannel. The predicted temperature profile is consistent with the experimental literature data.

Two-dimensional model of methane thermal decomposition reactors with radiative heat transfer and carbon particle growth

AIChE Journal ◽  
2011 ◽  
Vol 58 (8) ◽  
pp. 2545-2556 ◽  
Author(s):  
Cyril Caliot ◽  
Gilles Flamant ◽  
Giorgos Patrianakos ◽  
Margaritis Kostoglou ◽  
Athanasios G. Konstandopoulos
Keyword(s):  
Heat Transfer ◽  
Thermal Decomposition ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Carbon Particle ◽  
Particle Growth ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

scholarly journals Radiative heat transfer analysis by the Radiative Heat Ray method (Analysis in a two-dimensional model)

1986 ◽  
Vol 52 (476) ◽  
pp. 1734-1740 ◽  
Author(s):  
Hiroshi HAYASAKA ◽  
Kazuhiko KUDO ◽  
Hiroshi TANIGUCHI ◽  
Ichiro NAKAMACHI ◽  
Toshiaki OMORI ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Heat Transfer Analysis ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Ray Method ◽  
Two Dimensional Model ◽  
Method Analysis

scholarly journals Biomass/Coal Derived Gas Utilization in a Gas Turbine Combustor

1998 ◽  
Author(s):  
P. D. J. Hoppesteyn ◽  
J. Andries ◽  
K. R. G. Hein
Keyword(s):  
Experimental Data ◽  
Gas Turbine ◽  
Calorific Value ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Gas Turbine Combustor ◽  
Cylindrical Chamber ◽  
Fuel Gas ◽  
Gas Utilization ◽  
Two Dimensional Model

Low calorific value fuel gas, obtained by pressurized fluidized bed gasification of coal/biomass mixtures, is combusted at 0.8 MPa with air or oxygen in a vertical cylindrical chamber (D = 0.28 m, L = 2.0 m). The fuel (T = 1060 K) and oxydizer (air at 350 K, oxygen at 460 K) are injected coaxially, resulting in an essentially axissymmetric flow pattern. Particles have been removed from the fuel gas stream by a cyclone, mounted between the gasifier and the combustor. A two-dimensional model, implemented in the CFD code FLUENT was developed for the calculation of temperatures, flow patterns and species concentrations throughout the combustor. The calculated results are compared with experimental data for two low calorific value fuel gas compositions and two oxidizer compositions at two axial combustor locations (X/L = 0.175 and X/L = 1). The results appear to justify further investigation of the applicability of the model to low calorific value fuel gas fired gas turbine combustors.

scholarly journals Thermal Effects of Crevassing on Steele Glacier, Yukon Territory, Canada

1974 ◽  
Vol 13 (68) ◽  
pp. 243-254 ◽  
Author(s):  
Gary T. Jarvis ◽  
Garry K. C. Clarke
Keyword(s):  
Temperature Profile ◽  
Thermal Effects ◽  
Yukon Territory ◽  
Temperature Measurements ◽  
Temperature Profiles ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model ◽  
Made In

Ice temperature measurements have been made in Steele Glacier to a depth of 114 m. All measured temperatures were below 0° C, the coldest being –6.5° C at a depth of 114 m. The temperature profile indicates an anomalously warm layer of ice between 30 m and 50 m, which is probably due to the freezing of water in crevasses opened during the 1965–66 surge. A two-dimensional model of a cold glacier with partially water-filled crevasses predicts temperature profiles very similar to that observed.

Two-dimensional simulation of unsteady heat transfer from a circular cylinder in crossflow

2007 ◽  
Vol 570 ◽  
pp. 177-215 ◽  
Author(s):  
SALEM BOUHAIRIE ◽  
VINCENT H. CHU
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Circular Cylinder ◽  
Reynolds Numbers ◽  
Boundary Layer Separation ◽  
Length Scale ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Transfer Rates ◽  
Two Dimensional Model

The heat transfer from the surface of a circular cylinder into a crossflow has been computed using a two-dimensional model, for a range of Reynolds numbers from Re=200 to 15550. The boundary-layer separation, the local and overall heat-transfer rates, the eddy- and flare-detachment frequencies and the width of the flares were determined from the numerical simulations. In this range of Reynolds numbers, the heat-transfer process is unsteady and is characterized by a viscous length scale that is inversely proportional to the square root of the Reynolds number. To ensure uniform numerical accuracy for all Reynolds numbers, the dimensions of the computational mesh were selected in proportion to this viscous length scale. The small scales were resolved by at least three nodes within the boundary layers. The frequency of the heat flares increases, and the width of each flare decreases, with the Reynolds number, in proportion to the viscous time and length scales. Despite the presence of three-dimensional structures for the range of Reynolds numbers considered, the two-dimensional model captures the unsteady processes and produced results that were consistent with the available experimental data. It correctly simulated the overall, the front-stagnation and the back-to-total heat-transfer rates.

Numerical Simulation of the Austenitizing Process in Hypoeutectoid Fe-C Steels

2014 ◽  
Author(s):  
Dehao Liu ◽  
Gang Wang ◽  
Zhenguo Nie ◽  
Yiming (Kevin) Rong
Keyword(s):  
Front Tracking ◽  
Two Dimensional ◽  
Austenite Matrix ◽  
Transformation Kinetics ◽  
Special Volume ◽  
Dimensional Model ◽  
Austenitization Temperature ◽  
One Dimensional ◽  
Two Dimensional Model ◽  
2D Model

For predicting of diffusive phase transformations during the austenitizing process in hypoeutectoid Fe-C steels, a two-dimensional model has been developed. The diffusion equations are solved within each phase (α and γ) using an explicit finite volume technique formulated using a square grid. The discrete α/γ interface is represented by special volume elements α/γ. The result showing the dissolution of ferrite particles in the austenite matrix are presented at different stages of the phase transformation. Specifically, the influence of the microstructure scale and heating rate on the transformation kinetics has been investigated. Final austenitization temperature calculated with this 2D model is compared with predictions of a simpler one dimensional (1D) front-tracking calculation.

scholarly journals Thermal Effects of Crevassing on Steele Glacier, Yukon Territory, Canada

1974 ◽  
Vol 13 (68) ◽  
pp. 243-254 ◽  
Author(s):  
Gary T. Jarvis ◽  
Garry K. C. Clarke
Keyword(s):  
Temperature Profile ◽  
Thermal Effects ◽  
Yukon Territory ◽  
Temperature Measurements ◽  
Temperature Profiles ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model ◽  
Made In

Ice temperature measurements have been made in Steele Glacier to a depth of 114 m. All measured temperatures were below 0° C, the coldest being –6.5° C at a depth of 114 m. The temperature profile indicates an anomalously warm layer of ice between 30 m and 50 m, which is probably due to the freezing of water in crevasses opened during the 1965–66 surge. A two-dimensional model of a cold glacier with partially water-filled crevasses predicts temperature profiles very similar to that observed.

scholarly journals Heat Transfer Characteristics of Two-Dimensional Model of Parallel Louver Fin

1989 ◽  
Vol 55 (516) ◽  
pp. 2457-2464 ◽  
Author(s):  
Kenjiro SUZUKI ◽  
Tetsuro HAYASHI ◽  
Matthew J. SCHUERGER ◽  
Atsuo NISHIHARA ◽  
Masakatsu HAYASHI
Keyword(s):  
Heat Transfer ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Two Dimensional Model
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