Natural convection boundary layers adjacent to pyrolyzing surfaces

A comprehensive analysis to convection heat transfer of power-law fluids along the inclined nonuniformly heated plate with suction or injection is presented. The effects of power-law viscosity on temperature field are taken into account in highly coupled velocity and temperature fields. Analytical solutions are established by homotopy analysis method (HAM), and the effects of pertinent parameters (velocity power-law exponent, temperature power index, suction/injection parameter, and inclination angle) are analyzed. Some new interesting phenomena are found, for example, unlike classical boundary layer problem in which the skin friction monotonically increases (decreases) with suction increases (injection increases), but there exists a special region where the skin friction is not monotonic, which is strongly bound up with Prandtl number, which have never been reported before. The nonmonotony occurs in suction region for Prandtl number Npr < 1 and injection region for Npr > 1. Results also illustrate that the velocity profile decreases but the heat convection is enhanced obviously with increasing in temperature power exponent m (generalized Prandtl number Npr has similar effects), the decreases in inclination angle lead to the reduction in convection and heat transfer efficiency.

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Downward Smolder Of Polyurethane Foam

Torero¹,

Fernandez‐Pello²,

Kitano³

1994

Fire Safety Science - Proceedings of the Fourth International S

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A study is carried out to determine the controlling mechanisms of natural convection downward smolder through a porous combustible material, and to observe the effect of buoyancy on the propagation of the smolder reaction. Measurements are performed of the smolder reaction temperature and velocity through polyurethane foam as a function of the smolder reaction location and sample size. Three zones with different smolder characteristics can be identified from the measurements. An initial zone where heat transfer from the igniter results in relatively high smolder velocities. A middle zone with an approximately constant, or slightly increasing, smolder velocity, whose length increases with the foam length, considered to be representative of self-propagating somolder in natural convection. A final zone, near the end of the sample, that is characterised by a strong increase in the smolder velocity due to an increase in the flow rate of oxidizer through the sample. A theoretical analysis of the flow field induced by buoyancy through the foam is developed and incorporated to the theoretical model of Dosanjh et al. [l] for opposed forced smolder, and the results of the model are used to correlate the experimental smolder velocity data. The model predicts very well the experimental measurements, and indicates that, for the present experimental conditions, downward smoldering is a process controlled by the supply of oxidizer to the reaction zone.

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Natural convection boundary layers adjacent to pyrolyzing surfaces

Cited by 3 publications

References 11 publications

A multiphase formulation for fire propagation in heterogeneous combustible media

A multiphase formulation for fire propagation in heterogeneous combustible media

Convection Heat Transfer of Power-Law Fluids Along the Inclined Nonuniformly Heated Plate With Suction or Injection

Downward Smolder Of Polyurethane Foam

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