Narrow Results

The essence of the current examination is to carry out thermofluid parametric sensitivity with time-varying thermal migration of chemically reactive tiny species across an oscillating infinite plate surface. The impact of thermal motile tiny particles under the influence of many other oscillating flow parameters has yet to be investigated; hence the results obtained in this research are novel. Using a suitable non-dimensional variable, the leading PDEs (partial differential equations) are transmuted into dimensionless PDEs, ensuring equations are numerically solved using the MAPLE built-in approach. The numerical values produced in a limited scenario are linked with the outcomes found in the literature to validate the precision of the numerical approach utilized. The fluctuations in the profiles of the velocity, temperature, and concentration, in addition to the wall friction and rate of thermal and solutal transport, are illustrated via graphs and tables due to the modification of the critical parameters. The endmost results of the study concede that increasing permeability quantity and thermal and solutal buoyancy impellers intensify the fluid velocity. In contrast, a converse tendency is perceived with magnetic parameter and also, wall friction acts opposite to the velocity. The fluid temperature attenuated with dilation of the Prandtl number and radiation parameter, whilst a contrary trend was perceived with Eckert number. The increasing thermo-diffusion helps to develop fluid concentration whilst the Schmidt number and chemical reaction displayed opposite trend. Further, we achieved a tremendous conformity between the current findings and genuine results in the literature.

To evaluate the performance of discharged foam agents used to protect structures from heat and fire damages, the thermal characteristics of fire-extinguishment foams were experimentally investigated. Especially, two different parameters of a spray nozzle, that is, the number of air holes and the orifice diameter, were considered. A simple repeatable test for fire-extinguishment foams subjected to fire radiation was performed. Experimental results showed that the expansion ratio of the discharged foam with the small orifice throat (d₀= 9.5 mm) and opened air hole (N_h=9) was large. Results also showed that although the temperature gradient in the foam increased as the foam expansion ratio is increased, it remained constant as the intensity of heat flux increased.

We performed structural optimization of a selective emitter with two-dimensional silicon based gratings coated by platinum as a thermal radiator to promote methane steam reforming reaction. The structural parameters were optimized by numerical calculation to radiate high thermal power in a vibrational absorption band of methane molecule at 3.3 μm. Optical property of the fabricated optimum selective emitter with periodicity Λ = 2.6 μm found that the emission peak was resonant with this absorption band. The amount of hydrogen produced by the methane steam reforming process using the optimized selective emitter became four times greater than that obtained by the flat emitter.

In this paper, a new tool for the solution of nonlinear differential equations is presented. It is named rational homotopy perturbation method (RHPM). It delivers a high precision representation of the nonlinear differential equation using a few linear algebraic terms. In order to assess the benefits of this proposal, three nonlinear problems are solved and compared against other semi-analytic methods or numerical methods. Furthermore, in order to deal with BVP problems, we propose a modification of RHPM method. The obtained results show that RHPM is a powerful tool capable to generate highly accurate rational solutions.

Tank fires, whose main harm is the heat radiation, bring not only great economic losses to an enterprise and great threat to people's life and property safety, but also serious pollution to the environment. The way to keep a tank fire from spreading is cooling nearby tanks to prevent them from igniting. In the process the key is the reasonable infliction of cooling water intensity to the tank nearby. Through analyses of heat transfer characteristics of the tank on fire and those nearby, this article has established first a model of heat transfer from the tank on fire to nearby tanks by building up an equation between the total heat a nearby tank absorbs and the heat absorbed by its wall, the oil inside and cooling water, and then established a calculation model of the cooling water intensity of adjacent tanks.