HEAT TRANSFER TO DISPERSED SWIRL FLOW OF HIGH-PRESSURE WATER WITH LOW WALL SUPERHEAT

1991 ◽  
Vol 4 (2) ◽  
pp. 153-169 ◽  
Author(s):  
P. Papadopoulos ◽  
D. M. France ◽  
W. J. Minkowycz
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Swirl Flow ◽  
Wall Superheat ◽  
Pressure Water

scholarly journals Numerical study on laminar free convection heat transfer between sphere particle and high pressure water in pseudo-critical zone

2014 ◽  
Vol 18 (4) ◽  
pp. 1293-1303 ◽  
Author(s):  
Liping Wei ◽  
Youjun Lu ◽  
Jinjia Wei
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Free Convection ◽  
Fluidized Bed ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Boussinesq Approximation ◽  
Convection Heat ◽  
Pressure Water ◽  
Free Convection Heat

Supercritical water fluidized bed reactor (SCWFBR) is a promising new reaction vessel which can effectively gasify wet biomass and efficiently produce hydrogen. Free convection heat transfer from particle in supercritical water (SCW) is a major basic heat transfer mechanism in a fixed bed or fluidized bed with low superficial velocity. In this paper, numerical study on the steady free convection heat transfer around single sphere particle in high pressure water of pseudo-critical zone was carried out. Both the Boussinesq approximation method and real properties model (considering variable specific heat, density, viscosity, and conductivity of SCW) were incorporated to simulate the flow and temperature field. With respect to Boussinesq approximation, real properties model shows higher vorticity and temperature gradients in the vicinity of the sphere surface, which shows variation of thermo-physical property has remarkable effect on the free convection heat transfer process. High local Nusselt number and high heat transfer rate were observed with real properties model.

Study of Convective Heat Transfer Coefficient of High Pressure Water Descaling

2014 ◽  
Vol 599-601 ◽  
pp. 1976-1980
Author(s):  
Peng Gao
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
High Pressure ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Pressure Water ◽  
The Mathematical Model

In order to improving the product quality of hot rolled plate, the iron scale was removed by high pressure water descaling before hot rolling. The billet temperature dropped when a large amount of high pressure water injected on the billet surface. Establishing reasonably mathematical model of temperature field was very important, because it was related to formulate correctly rolling technology. High pressure water descaling convection heat transfer coefficient was an important parameter in the mathematical model of the temperature field. This paper calculated the high pressure water convection heat transfer coefficient by the method of numerical simulation, and regressed the mathematical model of the high pressure water coefficient of convective heat transfer by nonlinear regression method. The author used this mathematical model for finite element analysis in a steel mill, the results showed that the simulation results agreed with the experimental results, the mathematical model of high pressure water descaling convective heat transfer coefficient was reasonable.

Transition Boiling Models in Heat Exchangers

1988 ◽  
Vol 110 (3) ◽  
pp. 705-709
Author(s):  
D. M. France ◽  
S. K. Shin ◽  
M. Azimi ◽  
A. Shafiei
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Analysis ◽  
High Pressure ◽  
Heat Transfer Coefficient ◽  
Heat Exchangers ◽  
Boiling Heat Transfer ◽  
Quality Change ◽  
Boiling Heat Transfer Coefficient ◽  
Pressure Water

Models are presented for the inclusion of transition boiling heat transfer in the thermal analysis of liquid-heated boiling water heat exchangers. A relation was developed from experimental data for the prediction of the quality change in the transition boiling region. This quality relation was used alone and in conjunction with a transition boiling heat transfer coefficient to formulate two successful models. Predictions of heat exchanger heat transfer, including the transition boiling models, were compared with experimental results for high-pressure water in the range 7–15.3 MPa over a mass flux of 0.7–3.2 Mg/m2s.

High-Pressure Transition Boiling in Internal Flows

1987 ◽  
Vol 109 (2) ◽  
pp. 498-502 ◽  
Author(s):  
D. M. France ◽  
I. S. Chan ◽  
S. K. Shin
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Boiling Heat Transfer ◽  
Internal Flow ◽  
Parameter Range ◽  
Liquid Sodium ◽  
Internal Flows ◽  
State Tests ◽  
Boiling Heat Transfer Coefficient ◽  
Pressure Water

Transition boiling heat transfer was studied for the case of internal flow of high-pressure water. Transition boiling results were determined from measurements from 138 steady-state tests conducted in a temperature-controlled facility. Water flowed vertically upward inside a tube with inside diameter = 10.1 mm and vertical length = 13.1 m, as it was heated by liquid sodium flowing countercurrent in a surrounding annulus. The water parameter range of the experiments was pressure 7–15.3 MPa and mass flux 0.7–3.2 Mg/m2•s. A mathematical model was developed that predicted the transition boiling heat transfer coefficient well over the entire parameter range.

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