The Effect of Specimen Thickness on Critical Heat Flux and Effective Thermal Inertia Calculations Using Cone Calorimeter and Ignitability Test Apparatus

2016 ◽  
pp. 715-722
Author(s):  
Tsuneto Tsuchihashi ◽  
Kazunori Harada
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Cone Calorimeter ◽  
Thermal Inertia ◽  
Specimen Thickness ◽  
Test Apparatus

Flammability of Solid Materials: An Experimental Calorimetric Approach

2011 ◽  
Author(s):  
Paolo E. Santangelo ◽  
Noah L. Ryder ◽  
Andre´ W. Marshall ◽  
Christopher F. Schemel
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Quantitative Estimation ◽  
Hazard Analysis ◽  
Thermal Inertia ◽  
Fire Risk ◽  
Solid Materials ◽  
General Applicability ◽  
Plastic Materials ◽  
Validity Range

Flammability properties of solid materials are necessary to be a known parameter for many purposes: among them, forensic investigations of fire and explosion events, fire risk or hazard analysis, design and development of combustion-based systems. However, despite the large quantity of data in the literature, the flammability properties of many materials still appear not to be available or show a degree of uncertainty associated with them, which makes their value limited. The present work is aimed at proposing a calorimetric-based approach to determine some flammability and thermophysical properties of solids, with specific regard to time-to-ignition as a function of the imposed heat flux. Plastic materials have been here chosen as test cases, even though this approach has a general applicability. The two mentioned parameters have been analyzed to provide a quantitative estimation of the critical heat flux (minimum heat flux resulting in ignition). A cone calorimeter has been employed to conduct the experiments: the facility complies with standard ASTM E 1354; the related uncertainty and validity range has been evaluated through an appropriate error analysis. Finally, thermal inertia has been thereby calculated for the considered materials through a simple thermodynamic model, which is based upon critical heat flux and energy conservation.

scholarly journals IMPACT OF THE ELECTRIC CABLES INSTALLATION ON THE IGNITION PARAMETERS OF THE SPRUCE WOOD SURFACE

Wood Research ◽  
2021 ◽  
Vol 66 (5) ◽  
pp. 732-745
Author(s):  
ALEŠ NEČAS ◽  
JOZEF MARTINKA ◽  
PETER RANTUCH ◽  
IGOR WACHTER ◽  
TOMÁŠ ŠTEFKO
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Ignition Temperature ◽  
Thermal Inertia ◽  
Thermal Response ◽  
Heat Fluxes ◽  
Wood Board ◽  
Spruce Wood ◽  
Board Surface ◽  
Electrical Cables

This study is aimed to investigate of an impact of electrical cables installed on Norway spruce (Picea abies(L.) Karst.) wood board surface on main ignition parameters (mainly critical heat flux, ignition temperature, thermal response parameter and thermal inertia). Ignition parameters have been determined by dependence of ignition times (raised to the power of -1, -1/2 and -0.547) on heat flux. Initiation times have been measured for three configurations of spruce wood boards with surface dimensions of 100 x 100 mm ± 1 mm (the first configuration: board without cables on surface, the second configuration: board with three electrical cables on surface -spacing between cables was equal to their diameter and the third configuration: board with five electrical cables -spacing between cables was equal to their diameter) at five heat fluxes (30, 35, 40, 45 and 50 kW·m-2). Obtained results proved that installation of the electrical cables on the spruce wood board surface has a significant impact on the ignition parameters. The critical heat flux (8.5 kW·m-2), apparent thermal inertia0.20 ± 0.02 kJ2·m-4·K-2·s-1and ignition temperature 324 ± 105°C of spruce wood board increased up to 18 ± 3 kW·m-2(critical heat flux), 0.68 ± 0.03 kJ2·m-4·K-2·s-1(apparent thermal inertia) and 475 ± 27°C (ignition temperature) by theinstallation of electrical cableson the surface of spruce wood board.

REVIEW OF CRITICAL HEAT FLUX IN A VERTICALLY DOWNWARD TWO PHASE FLOW

2018 ◽  
Author(s):  
Rajeshwar Sripada ◽  
Veeredhi Vasudeva Rao
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

CRITICAL HEAT FLUX ENHANCEMENT ON NANOPILLAR ARRAY SURFACES

2018 ◽  
Author(s):  
Tuan Tran ◽  
Dongdong Liu ◽  
Binh-Thien Nguyen
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flux Enhancement

INVESTIGATING THE RELATIONSHIP BETWEEN SURFACE WICKABILITY AND CRITICAL HEAT FLUX DURING POOL BOILING

2018 ◽  
Author(s):  
Youngsup Song ◽  
Yangying Zhu ◽  
Daniel J. Preston ◽  
H. Jeremy Cho ◽  
Zhengmao Lu ◽  
...  
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Pool Boiling ◽  
The Relationship
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