Effect of gas radiation on radiative heat transfer in urban street canyon model

2009 ◽  
Vol 38 (7) ◽  
pp. 464-474
Author(s):  
Noboru Yamada ◽  
Yutaka Hasegawa ◽  
Shigenao Maruyama
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Street Canyon ◽  
Radiative Heat ◽  
Urban Street Canyon ◽  
Urban Street ◽  
Gas Radiation

Computer Modeling of the Continuous Annealing Furnace

1992 ◽  
Vol 114 (4) ◽  
pp. 345-350 ◽  
Author(s):  
S. H. Jeong ◽  
M. Y. Ha
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Heat Transfer Analysis ◽  
Continuous Annealing ◽  
Transient Species ◽  
Annealing Furnace ◽  
Zone Method ◽  
Gas Radiation ◽  
Continuous Annealing Furnace

A computer program to calculate the strip temperature heated in the continuous annealing furnace was developed, using the zone method for radiative heat transfer analysis with the measured gas temperature in the furnace. Using the FE operator, the present study considered the effects of soot and transient species in addition to the H2O-CO2 gas mixture on the gas radiative heat transfer. The predicted strip temperature distribution for FE = 1.05 represented well the measured data. The maximum difference in the heat flux transfered to the strip from the combustion gas for FE = 1.0 (without soot and transient species gas radiation) and 1.05 (with soot and transient species gas radiation) was about 15 percent. The present study also investigated the effects of line speed and thickness variations on the strip temperature, establishing the bases for the on-line computer model.

Effects of Gas Radiation on the Thermal Characteristics of Regeneratively Cooled Rocket Engines

2002 ◽  
Author(s):  
Mohammad H. N. Naraghi ◽  
Edmundo M. Nunes
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiation Effects ◽  
Radiative Heat ◽  
Thermal Characteristics ◽  
Liquid Hydrogen ◽  
Coolant Flow ◽  
Liquid Oxygen ◽  
Rocket Engines ◽  
Gas Radiation

This paper studies the effects of radiative heat transfer on the thermal characteristics of regeneratively cooled rocket engines. A conjugated radiative, conductive and convective model is used to analyze the effects of radiative heat transfer in two regeneratively cooled rocket engines. One engine has liquid hydrogen and liquid oxygen as the propellant and liquid hydrogen as the coolant. The other engine has RP1 (a hydrocarbon fuel) and liquid oxygen as the propellant and liquid oxygen as the coolant. It is shown that gas radiation has some effect on the wall temperature of the LH2-LO2 engine and a small effect on its coolant flow characteristics. For the RP1-LO2 engine, however, gas radiation significantly increases the coolant pressure drop, temperature and Mach number. It is also shown that radiation effects must be addressed in cooling channel design, so that wall temperatures and cryogenic coolant flow temperature/pressure are at suitable levels.

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