Problem of heat-flux screening in the radiative-convective heating of bodies over which a high-enthalpy gas flows

1984 ◽  
Vol 46 (1) ◽  
pp. 64-71
Author(s):  
A. B. Karasev ◽  
T. V. Kondranin
Keyword(s):  
Heat Flux ◽  
Convective Heating ◽  
Gas Flows ◽  
High Enthalpy

scholarly journals Coaxial Thermocouples for Heat Transfer Measurements in Long-Duration High Enthalpy Flows

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5254
Author(s):  
Shizhong Zhang ◽  
Qiu Wang ◽  
Jinping Li ◽  
Xiaoyuan Zhang ◽  
Hong Chen
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Surface Temperature ◽  
Thermal Effusivity ◽  
Fast Response ◽  
Test Time ◽  
Physical Parameters ◽  
Fourier Number ◽  
High Enthalpy ◽  
Long Duration

Coaxial thermocouples have the advantages of fast response and good durability. They are widely used for heat transfer measurements in transient facilities, and researchers have also considered their use for long-duration heat transfer measurements. However, the model thickness, transverse heat transfer, and changes in the physical parameters of the materials with increasing temperature influence the accuracy of heat transfer measurements. A numerical analysis of coaxial thermocouples is conducted to determine the above influences on the measurement deviation. The minimum deviation is obtained if the thermal effusivity of chromel that changes with the surface temperature is used to derive the heat flux from the surface temperature. The deviation of the heat flux is less than 5.5% when the Fourier number is smaller than 0.255 and 10% when the Fourier number is smaller than 0.520. The results provide guidance for the design of test models and coaxial thermocouples in long-duration heat transfer measurements. The numerical calculation results are verified by a laser radiation heating experiment, and heat transfer measurements using coaxial thermocouples in an arc tunnel with a test time of several seconds are performed.

Experimental Study on Heat Flux Augmentation in High-enthalpy Shock Tunnels

2014 ◽  
Author(s):  
Hideyuki Tanno ◽  
Tomoyuki Komuro ◽  
Naofumi Ohnishi ◽  
Tomoaki Ishihara ◽  
Yousuke Ogino ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
High Enthalpy ◽  
Shock Tunnels

Miniaturized heat flux sensor for high enthalpy plasma flow characterization

2013 ◽  
Vol 21 (4) ◽  
pp. 605-618 ◽  
Author(s):  
Jean-Laurent Gardarein ◽  
Jean-Luc Battaglia ◽  
Stefan Löhle ◽  
Pierre Jullien ◽  
Bruno Van Ootegem ◽  
...  
Keyword(s):  
Heat Flux ◽  
Plasma Flow ◽  
Heat Flux Sensor ◽  
High Enthalpy ◽  
Flow Characterization ◽  
Flux Sensor

scholarly journals Особенности испарения капли при лучистом и конвективном нагреве

2020 ◽  
Vol 46 (8) ◽  
pp. 25
Author(s):  
В.А. Архипов ◽  
С.А. Басалаев ◽  
Н.Н. Золоторёв ◽  
К.Г. Перфильева ◽  
А.С. Усанина
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Comparative Analysis ◽  
Evaporation Rate ◽  
Water Drop ◽  
Radiant Heat ◽  
Convective Heating ◽  
Distilled Water ◽  
Radiant Heat Flux ◽  
Convective Heat Flux

New method for determining the evaporation rate of single levitating drop at radiant heat flux has been proposed. The results of experimental study of the evaporation rate of distilled water drop upon heating by radiant and convective heat flux in the range of q = (0.25–1.5) W/cm^2 are presented. Comparative analysis of the features of the drop evaporation during radiant and convective heating has been carried out.

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