scholarly journals The Adiabatic Surface Temperature and the Plate Thermometer

2011 ◽  
Vol 10 ◽  
pp. 1001-1011 ◽  
Author(s):  
U. Wickström
Keyword(s):  
Surface Temperature ◽  
Plate Thermometer ◽  
Adiabatic Surface

Experimental and numerical simulation studies on heat transfer to calorimeters engulfed in diesel pool fires

2017 ◽  
Vol 35 (2) ◽  
pp. 156-176 ◽  
Author(s):  
Sudheer Siddapureddy ◽  
SV Prabhu
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Surface Temperature ◽  
Heat Fluxes ◽  
Numerical Code ◽  
Pool Fires ◽  
Steel Pipes ◽  
Adiabatic Surface ◽  
In Fire ◽  
Good Agreement

Characterization of heat transfer to calorimeters engulfed in pool fires is extremely important. To estimate the heat flux to the calorimeters, experiments are performed with horizontal stainless steel 304L pipes engulfed in diesel pool fires. The concept of adiabatic surface temperature is applied to predict the incident heat flux to horizontally oriented calorimeters engulfed in diesel pool fires. Plate thermometers are used to measure the adiabatic surface temperature for diesel pool fires. The estimated subsurface temperatures inside the steel pipes using the adiabatic surface temperature concept and the measured temperatures are in good agreement. Adiabatic surface temperature is also computed from fire simulations. The incident heat fluxes to the steel pipes engulfed in fire predicted from the simulations are found to be in good agreement with the experiments. The fire numerical code is validated against the 1 m pool fire experimental results of centerline temperature distribution and irradiances away from fire. A correlation is provided for the estimation of adiabatic surface temperature for large diesel pool fires. These results would provide an effective way for thermal test simulations.

Use of Plate Thermometers for Better Estimate of Fire Development

2011 ◽  
Vol 82 ◽  
pp. 362-367 ◽  
Author(s):  
Alexandra Byström ◽  
Ulf Wickström ◽  
Milan Veljkovic
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Large Scale ◽  
Thermal Exposure ◽  
Alternative Methods ◽  
Gas Temperature ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Weighted Mean Temperature ◽  
Adiabatic Surface

The concept of Adiabatic Surface Temperature (AST) opens possibilities to calculate heat transfer to a solid surface based on one temperature instead of two as is needed when heat transfer by both radiation and convection must be considered. The Adiabatic Surface Temperature is defined as the temperature of a surface which cannot absorb or lose heat to the environment, i.e. a perfect insulator. Accordingly, the AST is a weighted mean temperature of the radiation temperature and the gas temperature depending on the heat transfer coefficients. A determining factor for introducing the concept of AST is that it can be measured with a cheap and robust method called the plate thermometer (PT), even under harsh fire conditions. Alternative methods for measuring thermal exposure under similar conditions involve water cooled heat flux meters that are in most realistic situations difficult to use and very costly and impractical. This paper presents examples concerning how the concept of AST can be used in practice both in reaction-to-fire tests and in large scale scenarios where structures are exposed to high and inhomogeneous temperature conditions.

Measurement and calculation of adiabatic surface temperature in a full-scale compartment fire experiment

2012 ◽  
Vol 31 (1) ◽  
pp. 35-50 ◽  
Author(s):  
Alexandra Byström ◽  
Xudong Cheng ◽  
Ulf Wickström ◽  
Milan Veljkovic
Keyword(s):  
Surface Temperature ◽  
Full Scale ◽  
Compartment Fire ◽  
Fire Experiment ◽  
Adiabatic Surface
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